| /* vi: set sw=4 ts=4: */ |
| /* |
| * ash shell port for busybox |
| * |
| * This code is derived from software contributed to Berkeley by |
| * Kenneth Almquist. |
| * |
| * Original BSD copyright notice is retained at the end of this file. |
| * |
| * Copyright (c) 1989, 1991, 1993, 1994 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * Copyright (c) 1997-2005 Herbert Xu <herbert@gondor.apana.org.au> |
| * was re-ported from NetBSD and debianized. |
| * |
| * Licensed under GPLv2 or later, see file LICENSE in this source tree. |
| */ |
| //config:config ASH |
| //config: bool "ash" |
| //config: default y |
| //config: depends on !NOMMU |
| //config: help |
| //config: Tha 'ash' shell adds about 60k in the default configuration and is |
| //config: the most complete and most pedantically correct shell included with |
| //config: busybox. This shell is actually a derivative of the Debian 'dash' |
| //config: shell (by Herbert Xu), which was created by porting the 'ash' shell |
| //config: (written by Kenneth Almquist) from NetBSD. |
| //config: |
| //config:# ash options |
| //config:# note: Don't remove !NOMMU part in the next line; it would break |
| //config:# menuconfig's indenting. |
| //config:if !NOMMU && (ASH || SH_IS_ASH || BASH_IS_ASH) |
| //config: |
| //config:config ASH_OPTIMIZE_FOR_SIZE |
| //config: bool "Optimize for size instead of speed" |
| //config: default y |
| //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH |
| //config: |
| //config:config ASH_INTERNAL_GLOB |
| //config: bool "Use internal glob() implementation" |
| //config: default y # Y is bigger, but because of uclibc glob() bug, let Y be default for now |
| //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH |
| //config: help |
| //config: Do not use glob() function from libc, use internal implementation. |
| //config: Use this if you are getting "glob.h: No such file or directory" |
| //config: or similar build errors. |
| //config: Note that as of now (2017-01), uclibc and musl glob() both have bugs |
| //config: which would break ash if you select N here. |
| //config: |
| //config:config ASH_BASH_COMPAT |
| //config: bool "bash-compatible extensions" |
| //config: default y |
| //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH |
| //config: |
| //config:config ASH_JOB_CONTROL |
| //config: bool "Job control" |
| //config: default y |
| //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH |
| //config: |
| //config:config ASH_ALIAS |
| //config: bool "Alias support" |
| //config: default y |
| //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH |
| //config: |
| //config:config ASH_RANDOM_SUPPORT |
| //config: bool "Pseudorandom generator and $RANDOM variable" |
| //config: default y |
| //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH |
| //config: help |
| //config: Enable pseudorandom generator and dynamic variable "$RANDOM". |
| //config: Each read of "$RANDOM" will generate a new pseudorandom value. |
| //config: You can reset the generator by using a specified start value. |
| //config: After "unset RANDOM" the generator will switch off and this |
| //config: variable will no longer have special treatment. |
| //config: |
| //config:config ASH_EXPAND_PRMT |
| //config: bool "Expand prompt string" |
| //config: default y |
| //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH |
| //config: help |
| //config: $PS# may contain volatile content, such as backquote commands. |
| //config: This option recreates the prompt string from the environment |
| //config: variable each time it is displayed. |
| //config: |
| //config:config ASH_IDLE_TIMEOUT |
| //config: bool "Idle timeout variable $TMOUT" |
| //config: default y |
| //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH |
| //config: help |
| //config: Enable bash-like auto-logout after $TMOUT seconds of idle time. |
| //config: |
| //config:config ASH_MAIL |
| //config: bool "Check for new mail in interactive shell" |
| //config: default y |
| //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH |
| //config: help |
| //config: Enable "check for new mail" function: |
| //config: if set, $MAIL file and $MAILPATH list of files |
| //config: are checked for mtime changes, and "you have mail" |
| //config: message is printed if change is detected. |
| //config: |
| //config:config ASH_ECHO |
| //config: bool "echo builtin" |
| //config: default y |
| //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH |
| //config: |
| //config:config ASH_PRINTF |
| //config: bool "printf builtin" |
| //config: default y |
| //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH |
| //config: |
| //config:config ASH_TEST |
| //config: bool "test builtin" |
| //config: default y |
| //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH |
| //config: |
| //config:config ASH_HELP |
| //config: bool "help builtin" |
| //config: default y |
| //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH |
| //config: |
| //config:config ASH_GETOPTS |
| //config: bool "getopts builtin" |
| //config: default y |
| //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH |
| //config: |
| //config:config ASH_CMDCMD |
| //config: bool "command builtin" |
| //config: default y |
| //config: depends on ASH || SH_IS_ASH || BASH_IS_ASH |
| //config: help |
| //config: Enable support for the 'command' builtin, which allows |
| //config: you to run the specified command or builtin, |
| //config: even when there is a function with the same name. |
| //config: |
| //config:endif # ash options |
| |
| //applet:IF_ASH(APPLET(ash, BB_DIR_BIN, BB_SUID_DROP)) |
| // APPLET_ODDNAME:name main location suid_type help |
| //applet:IF_SH_IS_ASH( APPLET_ODDNAME(sh, ash, BB_DIR_BIN, BB_SUID_DROP, ash)) |
| //applet:IF_BASH_IS_ASH(APPLET_ODDNAME(bash, ash, BB_DIR_BIN, BB_SUID_DROP, ash)) |
| |
| //kbuild:lib-$(CONFIG_ASH) += ash.o ash_ptr_hack.o shell_common.o |
| //kbuild:lib-$(CONFIG_SH_IS_ASH) += ash.o ash_ptr_hack.o shell_common.o |
| //kbuild:lib-$(CONFIG_BASH_IS_ASH) += ash.o ash_ptr_hack.o shell_common.o |
| //kbuild:lib-$(CONFIG_ASH_RANDOM_SUPPORT) += random.o |
| |
| /* |
| * DEBUG=1 to compile in debugging ('set -o debug' turns on) |
| * DEBUG=2 to compile in and turn on debugging. |
| * When debugging is on ("set -o debug" was executed, or DEBUG=2), |
| * debugging info is written to ./trace, quit signal generates core dump. |
| */ |
| #define DEBUG 0 |
| /* Tweak debug output verbosity here */ |
| #define DEBUG_TIME 0 |
| #define DEBUG_PID 1 |
| #define DEBUG_SIG 1 |
| #define DEBUG_INTONOFF 0 |
| |
| #define PROFILE 0 |
| |
| #define JOBS ENABLE_ASH_JOB_CONTROL |
| |
| #include <setjmp.h> |
| #include <fnmatch.h> |
| #include <sys/times.h> |
| #include <sys/utsname.h> /* for setting $HOSTNAME */ |
| #include "busybox.h" /* for applet_names */ |
| |
| /* So far, all bash compat is controlled by one config option */ |
| /* Separate defines document which part of code implements what */ |
| /* function keyword */ |
| #define BASH_FUNCTION ENABLE_ASH_BASH_COMPAT |
| #define IF_BASH_FUNCTION IF_ASH_BASH_COMPAT |
| /* &>file */ |
| #define BASH_REDIR_OUTPUT ENABLE_ASH_BASH_COMPAT |
| #define IF_BASH_REDIR_OUTPUT IF_ASH_BASH_COMPAT |
| /* $'...' */ |
| #define BASH_DOLLAR_SQUOTE ENABLE_ASH_BASH_COMPAT |
| #define IF_BASH_DOLLAR_SQUOTE IF_ASH_BASH_COMPAT |
| #define BASH_PATTERN_SUBST ENABLE_ASH_BASH_COMPAT |
| #define IF_BASH_PATTERN_SUBST IF_ASH_BASH_COMPAT |
| #define BASH_SUBSTR ENABLE_ASH_BASH_COMPAT |
| #define IF_BASH_SUBSTR IF_ASH_BASH_COMPAT |
| /* [[ EXPR ]] */ |
| #define BASH_TEST2 (ENABLE_ASH_BASH_COMPAT * ENABLE_ASH_TEST) |
| #define BASH_SOURCE ENABLE_ASH_BASH_COMPAT |
| #define BASH_PIPEFAIL ENABLE_ASH_BASH_COMPAT |
| #define BASH_HOSTNAME_VAR ENABLE_ASH_BASH_COMPAT |
| #define BASH_SHLVL_VAR ENABLE_ASH_BASH_COMPAT |
| |
| #if defined(__ANDROID_API__) && __ANDROID_API__ <= 24 |
| /* Bionic at least up to version 24 has no glob() */ |
| # undef ENABLE_ASH_INTERNAL_GLOB |
| # define ENABLE_ASH_INTERNAL_GLOB 1 |
| #endif |
| |
| #if !ENABLE_ASH_INTERNAL_GLOB && defined(__UCLIBC__) |
| # error uClibc glob() is buggy, use ASH_INTERNAL_GLOB. |
| # error The bug is: for "$PWD"/<pattern> ash will escape e.g. dashes in "$PWD" |
| # error with backslash, even ones which do not need to be: "/a-b" -> "/a\-b" |
| # error glob() should unbackslash them and match. uClibc does not unbackslash, |
| # error fails to match dirname, subsequently not expanding <pattern> in it. |
| // Testcase: |
| // if (glob("/etc/polkit\\-1", 0, NULL, &pglob)) - this returns 0 on uclibc, no bug |
| // if (glob("/etc/polkit\\-1/*", 0, NULL, &pglob)) printf("uclibc bug!\n"); |
| #endif |
| |
| #if !ENABLE_ASH_INTERNAL_GLOB |
| # include <glob.h> |
| #endif |
| |
| #include "unicode.h" |
| #include "shell_common.h" |
| #if ENABLE_FEATURE_SH_MATH |
| # include "math.h" |
| #endif |
| #if ENABLE_ASH_RANDOM_SUPPORT |
| # include "random.h" |
| #else |
| # define CLEAR_RANDOM_T(rnd) ((void)0) |
| #endif |
| |
| #include "NUM_APPLETS.h" |
| #if NUM_APPLETS == 1 |
| /* STANDALONE does not make sense, and won't compile */ |
| # undef CONFIG_FEATURE_SH_STANDALONE |
| # undef ENABLE_FEATURE_SH_STANDALONE |
| # undef IF_FEATURE_SH_STANDALONE |
| # undef IF_NOT_FEATURE_SH_STANDALONE |
| # define ENABLE_FEATURE_SH_STANDALONE 0 |
| # define IF_FEATURE_SH_STANDALONE(...) |
| # define IF_NOT_FEATURE_SH_STANDALONE(...) __VA_ARGS__ |
| #endif |
| |
| #ifndef PIPE_BUF |
| # define PIPE_BUF 4096 /* amount of buffering in a pipe */ |
| #endif |
| |
| #if !BB_MMU |
| # error "Do not even bother, ash will not run on NOMMU machine" |
| #endif |
| |
| |
| /* ============ Hash table sizes. Configurable. */ |
| |
| #define VTABSIZE 39 |
| #define ATABSIZE 39 |
| #define CMDTABLESIZE 31 /* should be prime */ |
| |
| |
| /* ============ Shell options */ |
| |
| static const char *const optletters_optnames[] = { |
| "e" "errexit", |
| "f" "noglob", |
| "I" "ignoreeof", |
| "i" "interactive", |
| "m" "monitor", |
| "n" "noexec", |
| "s" "stdin", |
| "x" "xtrace", |
| "v" "verbose", |
| "C" "noclobber", |
| "a" "allexport", |
| "b" "notify", |
| "u" "nounset", |
| "\0" "vi" |
| #if BASH_PIPEFAIL |
| ,"\0" "pipefail" |
| #endif |
| #if DEBUG |
| ,"\0" "nolog" |
| ,"\0" "debug" |
| #endif |
| }; |
| |
| #define optletters(n) optletters_optnames[n][0] |
| #define optnames(n) (optletters_optnames[n] + 1) |
| |
| enum { NOPTS = ARRAY_SIZE(optletters_optnames) }; |
| |
| |
| /* ============ Misc data */ |
| |
| #define msg_illnum "Illegal number: %s" |
| |
| /* |
| * We enclose jmp_buf in a structure so that we can declare pointers to |
| * jump locations. The global variable handler contains the location to |
| * jump to when an exception occurs, and the global variable exception_type |
| * contains a code identifying the exception. To implement nested |
| * exception handlers, the user should save the value of handler on entry |
| * to an inner scope, set handler to point to a jmploc structure for the |
| * inner scope, and restore handler on exit from the scope. |
| */ |
| struct jmploc { |
| jmp_buf loc; |
| }; |
| |
| struct globals_misc { |
| uint8_t exitstatus; /* exit status of last command */ |
| uint8_t back_exitstatus;/* exit status of backquoted command */ |
| smallint job_warning; /* user was warned about stopped jobs (can be 2, 1 or 0). */ |
| int rootpid; /* pid of main shell */ |
| /* shell level: 0 for the main shell, 1 for its children, and so on */ |
| int shlvl; |
| #define rootshell (!shlvl) |
| char *minusc; /* argument to -c option */ |
| |
| char *curdir; // = nullstr; /* current working directory */ |
| char *physdir; // = nullstr; /* physical working directory */ |
| |
| char *arg0; /* value of $0 */ |
| |
| struct jmploc *exception_handler; |
| |
| volatile int suppress_int; /* counter */ |
| volatile /*sig_atomic_t*/ smallint pending_int; /* 1 = got SIGINT */ |
| volatile /*sig_atomic_t*/ smallint got_sigchld; /* 1 = got SIGCHLD */ |
| volatile /*sig_atomic_t*/ smallint pending_sig; /* last pending signal */ |
| smallint exception_type; /* kind of exception (0..5) */ |
| /* exceptions */ |
| #define EXINT 0 /* SIGINT received */ |
| #define EXERROR 1 /* a generic error */ |
| #define EXEXIT 4 /* exit the shell */ |
| |
| smallint isloginsh; |
| char nullstr[1]; /* zero length string */ |
| |
| char optlist[NOPTS]; |
| #define eflag optlist[0] |
| #define fflag optlist[1] |
| #define Iflag optlist[2] |
| #define iflag optlist[3] |
| #define mflag optlist[4] |
| #define nflag optlist[5] |
| #define sflag optlist[6] |
| #define xflag optlist[7] |
| #define vflag optlist[8] |
| #define Cflag optlist[9] |
| #define aflag optlist[10] |
| #define bflag optlist[11] |
| #define uflag optlist[12] |
| #define viflag optlist[13] |
| #if BASH_PIPEFAIL |
| # define pipefail optlist[14] |
| #else |
| # define pipefail 0 |
| #endif |
| #if DEBUG |
| # define nolog optlist[14 + BASH_PIPEFAIL] |
| # define debug optlist[15 + BASH_PIPEFAIL] |
| #endif |
| |
| /* trap handler commands */ |
| /* |
| * Sigmode records the current value of the signal handlers for the various |
| * modes. A value of zero means that the current handler is not known. |
| * S_HARD_IGN indicates that the signal was ignored on entry to the shell. |
| */ |
| char sigmode[NSIG - 1]; |
| #define S_DFL 1 /* default signal handling (SIG_DFL) */ |
| #define S_CATCH 2 /* signal is caught */ |
| #define S_IGN 3 /* signal is ignored (SIG_IGN) */ |
| #define S_HARD_IGN 4 /* signal is ignored permanently */ |
| |
| /* indicates specified signal received */ |
| uint8_t gotsig[NSIG - 1]; /* offset by 1: "signal" 0 is meaningless */ |
| uint8_t may_have_traps; /* 0: definitely no traps are set, 1: some traps may be set */ |
| char *trap[NSIG]; |
| char **trap_ptr; /* used only by "trap hack" */ |
| |
| /* Rarely referenced stuff */ |
| #if ENABLE_ASH_RANDOM_SUPPORT |
| random_t random_gen; |
| #endif |
| pid_t backgndpid; /* pid of last background process */ |
| }; |
| extern struct globals_misc *const ash_ptr_to_globals_misc; |
| #define G_misc (*ash_ptr_to_globals_misc) |
| #define exitstatus (G_misc.exitstatus ) |
| #define back_exitstatus (G_misc.back_exitstatus ) |
| #define job_warning (G_misc.job_warning) |
| #define rootpid (G_misc.rootpid ) |
| #define shlvl (G_misc.shlvl ) |
| #define minusc (G_misc.minusc ) |
| #define curdir (G_misc.curdir ) |
| #define physdir (G_misc.physdir ) |
| #define arg0 (G_misc.arg0 ) |
| #define exception_handler (G_misc.exception_handler) |
| #define exception_type (G_misc.exception_type ) |
| #define suppress_int (G_misc.suppress_int ) |
| #define pending_int (G_misc.pending_int ) |
| #define got_sigchld (G_misc.got_sigchld ) |
| #define pending_sig (G_misc.pending_sig ) |
| #define isloginsh (G_misc.isloginsh ) |
| #define nullstr (G_misc.nullstr ) |
| #define optlist (G_misc.optlist ) |
| #define sigmode (G_misc.sigmode ) |
| #define gotsig (G_misc.gotsig ) |
| #define may_have_traps (G_misc.may_have_traps ) |
| #define trap (G_misc.trap ) |
| #define trap_ptr (G_misc.trap_ptr ) |
| #define random_gen (G_misc.random_gen ) |
| #define backgndpid (G_misc.backgndpid ) |
| #define INIT_G_misc() do { \ |
| (*(struct globals_misc**)&ash_ptr_to_globals_misc) = xzalloc(sizeof(G_misc)); \ |
| barrier(); \ |
| curdir = nullstr; \ |
| physdir = nullstr; \ |
| trap_ptr = trap; \ |
| } while (0) |
| |
| |
| /* ============ DEBUG */ |
| #if DEBUG |
| static void trace_printf(const char *fmt, ...); |
| static void trace_vprintf(const char *fmt, va_list va); |
| # define TRACE(param) trace_printf param |
| # define TRACEV(param) trace_vprintf param |
| # define close(fd) do { \ |
| int dfd = (fd); \ |
| if (close(dfd) < 0) \ |
| bb_error_msg("bug on %d: closing %d(0x%x)", \ |
| __LINE__, dfd, dfd); \ |
| } while (0) |
| #else |
| # define TRACE(param) |
| # define TRACEV(param) |
| #endif |
| |
| |
| /* ============ Utility functions */ |
| #define is_name(c) ((c) == '_' || isalpha((unsigned char)(c))) |
| #define is_in_name(c) ((c) == '_' || isalnum((unsigned char)(c))) |
| |
| static int |
| isdigit_str9(const char *str) |
| { |
| int maxlen = 9 + 1; /* max 9 digits: 999999999 */ |
| while (--maxlen && isdigit(*str)) |
| str++; |
| return (*str == '\0'); |
| } |
| |
| static const char * |
| var_end(const char *var) |
| { |
| while (*var) |
| if (*var++ == '=') |
| break; |
| return var; |
| } |
| |
| |
| /* ============ Interrupts / exceptions */ |
| |
| static void exitshell(void) NORETURN; |
| |
| /* |
| * These macros allow the user to suspend the handling of interrupt signals |
| * over a period of time. This is similar to SIGHOLD or to sigblock, but |
| * much more efficient and portable. (But hacking the kernel is so much |
| * more fun than worrying about efficiency and portability. :-)) |
| */ |
| #if DEBUG_INTONOFF |
| # define INT_OFF do { \ |
| TRACE(("%s:%d INT_OFF(%d)\n", __func__, __LINE__, suppress_int)); \ |
| suppress_int++; \ |
| barrier(); \ |
| } while (0) |
| #else |
| # define INT_OFF do { \ |
| suppress_int++; \ |
| barrier(); \ |
| } while (0) |
| #endif |
| |
| /* |
| * Called to raise an exception. Since C doesn't include exceptions, we |
| * just do a longjmp to the exception handler. The type of exception is |
| * stored in the global variable "exception_type". |
| */ |
| static void raise_exception(int) NORETURN; |
| static void |
| raise_exception(int e) |
| { |
| #if DEBUG |
| if (exception_handler == NULL) |
| abort(); |
| #endif |
| INT_OFF; |
| exception_type = e; |
| longjmp(exception_handler->loc, 1); |
| } |
| #if DEBUG |
| #define raise_exception(e) do { \ |
| TRACE(("raising exception %d on line %d\n", (e), __LINE__)); \ |
| raise_exception(e); \ |
| } while (0) |
| #endif |
| |
| /* |
| * Called when a SIGINT is received. (If the user specifies |
| * that SIGINT is to be trapped or ignored using the trap builtin, then |
| * this routine is not called.) Suppressint is nonzero when interrupts |
| * are held using the INT_OFF macro. (The test for iflag is just |
| * defensive programming.) |
| */ |
| static void raise_interrupt(void) NORETURN; |
| static void |
| raise_interrupt(void) |
| { |
| pending_int = 0; |
| /* Signal is not automatically unmasked after it is raised, |
| * do it ourself - unmask all signals */ |
| sigprocmask_allsigs(SIG_UNBLOCK); |
| /* pending_sig = 0; - now done in signal_handler() */ |
| |
| if (!(rootshell && iflag)) { |
| /* Kill ourself with SIGINT */ |
| signal(SIGINT, SIG_DFL); |
| raise(SIGINT); |
| } |
| /* bash: ^C even on empty command line sets $? */ |
| exitstatus = SIGINT + 128; |
| raise_exception(EXINT); |
| /* NOTREACHED */ |
| } |
| #if DEBUG |
| #define raise_interrupt() do { \ |
| TRACE(("raising interrupt on line %d\n", __LINE__)); \ |
| raise_interrupt(); \ |
| } while (0) |
| #endif |
| |
| static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void |
| int_on(void) |
| { |
| barrier(); |
| if (--suppress_int == 0 && pending_int) { |
| raise_interrupt(); |
| } |
| } |
| #if DEBUG_INTONOFF |
| # define INT_ON do { \ |
| TRACE(("%s:%d INT_ON(%d)\n", __func__, __LINE__, suppress_int-1)); \ |
| int_on(); \ |
| } while (0) |
| #else |
| # define INT_ON int_on() |
| #endif |
| static IF_ASH_OPTIMIZE_FOR_SIZE(inline) void |
| force_int_on(void) |
| { |
| barrier(); |
| suppress_int = 0; |
| if (pending_int) |
| raise_interrupt(); |
| } |
| #define FORCE_INT_ON force_int_on() |
| |
| #define SAVE_INT(v) ((v) = suppress_int) |
| |
| #define RESTORE_INT(v) do { \ |
| barrier(); \ |
| suppress_int = (v); \ |
| if (suppress_int == 0 && pending_int) \ |
| raise_interrupt(); \ |
| } while (0) |
| |
| |
| /* ============ Stdout/stderr output */ |
| |
| static void |
| outstr(const char *p, FILE *file) |
| { |
| INT_OFF; |
| fputs(p, file); |
| INT_ON; |
| } |
| |
| static void |
| flush_stdout_stderr(void) |
| { |
| INT_OFF; |
| fflush_all(); |
| INT_ON; |
| } |
| |
| /* Was called outcslow(c,FILE*), but c was always '\n' */ |
| static void |
| newline_and_flush(FILE *dest) |
| { |
| INT_OFF; |
| putc('\n', dest); |
| fflush(dest); |
| INT_ON; |
| } |
| |
| static int out1fmt(const char *, ...) __attribute__((__format__(__printf__,1,2))); |
| static int |
| out1fmt(const char *fmt, ...) |
| { |
| va_list ap; |
| int r; |
| |
| INT_OFF; |
| va_start(ap, fmt); |
| r = vprintf(fmt, ap); |
| va_end(ap); |
| INT_ON; |
| return r; |
| } |
| |
| static int fmtstr(char *, size_t, const char *, ...) __attribute__((__format__(__printf__,3,4))); |
| static int |
| fmtstr(char *outbuf, size_t length, const char *fmt, ...) |
| { |
| va_list ap; |
| int ret; |
| |
| va_start(ap, fmt); |
| INT_OFF; |
| ret = vsnprintf(outbuf, length, fmt, ap); |
| va_end(ap); |
| INT_ON; |
| return ret; |
| } |
| |
| static void |
| out1str(const char *p) |
| { |
| outstr(p, stdout); |
| } |
| |
| static void |
| out2str(const char *p) |
| { |
| outstr(p, stderr); |
| flush_stdout_stderr(); |
| } |
| |
| |
| /* ============ Parser structures */ |
| |
| /* control characters in argument strings */ |
| #define CTL_FIRST CTLESC |
| #define CTLESC ((unsigned char)'\201') /* escape next character */ |
| #define CTLVAR ((unsigned char)'\202') /* variable defn */ |
| #define CTLENDVAR ((unsigned char)'\203') |
| #define CTLBACKQ ((unsigned char)'\204') |
| #define CTLARI ((unsigned char)'\206') /* arithmetic expression */ |
| #define CTLENDARI ((unsigned char)'\207') |
| #define CTLQUOTEMARK ((unsigned char)'\210') |
| #define CTL_LAST CTLQUOTEMARK |
| |
| /* variable substitution byte (follows CTLVAR) */ |
| #define VSTYPE 0x0f /* type of variable substitution */ |
| #define VSNUL 0x10 /* colon--treat the empty string as unset */ |
| |
| /* values of VSTYPE field */ |
| #define VSNORMAL 0x1 /* normal variable: $var or ${var} */ |
| #define VSMINUS 0x2 /* ${var-text} */ |
| #define VSPLUS 0x3 /* ${var+text} */ |
| #define VSQUESTION 0x4 /* ${var?message} */ |
| #define VSASSIGN 0x5 /* ${var=text} */ |
| #define VSTRIMRIGHT 0x6 /* ${var%pattern} */ |
| #define VSTRIMRIGHTMAX 0x7 /* ${var%%pattern} */ |
| #define VSTRIMLEFT 0x8 /* ${var#pattern} */ |
| #define VSTRIMLEFTMAX 0x9 /* ${var##pattern} */ |
| #define VSLENGTH 0xa /* ${#var} */ |
| #if BASH_SUBSTR |
| #define VSSUBSTR 0xc /* ${var:position:length} */ |
| #endif |
| #if BASH_PATTERN_SUBST |
| #define VSREPLACE 0xd /* ${var/pattern/replacement} */ |
| #define VSREPLACEALL 0xe /* ${var//pattern/replacement} */ |
| #endif |
| |
| static const char dolatstr[] ALIGN1 = { |
| CTLQUOTEMARK, CTLVAR, VSNORMAL, '@', '=', CTLQUOTEMARK, '\0' |
| }; |
| #define DOLATSTRLEN 6 |
| |
| #define NCMD 0 |
| #define NPIPE 1 |
| #define NREDIR 2 |
| #define NBACKGND 3 |
| #define NSUBSHELL 4 |
| #define NAND 5 |
| #define NOR 6 |
| #define NSEMI 7 |
| #define NIF 8 |
| #define NWHILE 9 |
| #define NUNTIL 10 |
| #define NFOR 11 |
| #define NCASE 12 |
| #define NCLIST 13 |
| #define NDEFUN 14 |
| #define NARG 15 |
| #define NTO 16 |
| #if BASH_REDIR_OUTPUT |
| #define NTO2 17 |
| #endif |
| #define NCLOBBER 18 |
| #define NFROM 19 |
| #define NFROMTO 20 |
| #define NAPPEND 21 |
| #define NTOFD 22 |
| #define NFROMFD 23 |
| #define NHERE 24 |
| #define NXHERE 25 |
| #define NNOT 26 |
| #define N_NUMBER 27 |
| |
| union node; |
| |
| struct ncmd { |
| smallint type; /* Nxxxx */ |
| union node *assign; |
| union node *args; |
| union node *redirect; |
| }; |
| |
| struct npipe { |
| smallint type; |
| smallint pipe_backgnd; |
| struct nodelist *cmdlist; |
| }; |
| |
| struct nredir { |
| smallint type; |
| union node *n; |
| union node *redirect; |
| }; |
| |
| struct nbinary { |
| smallint type; |
| union node *ch1; |
| union node *ch2; |
| }; |
| |
| struct nif { |
| smallint type; |
| union node *test; |
| union node *ifpart; |
| union node *elsepart; |
| }; |
| |
| struct nfor { |
| smallint type; |
| union node *args; |
| union node *body; |
| char *var; |
| }; |
| |
| struct ncase { |
| smallint type; |
| union node *expr; |
| union node *cases; |
| }; |
| |
| struct nclist { |
| smallint type; |
| union node *next; |
| union node *pattern; |
| union node *body; |
| }; |
| |
| struct narg { |
| smallint type; |
| union node *next; |
| char *text; |
| struct nodelist *backquote; |
| }; |
| |
| /* nfile and ndup layout must match! |
| * NTOFD (>&fdnum) uses ndup structure, but we may discover mid-flight |
| * that it is actually NTO2 (>&file), and change its type. |
| */ |
| struct nfile { |
| smallint type; |
| union node *next; |
| int fd; |
| int _unused_dupfd; |
| union node *fname; |
| char *expfname; |
| }; |
| |
| struct ndup { |
| smallint type; |
| union node *next; |
| int fd; |
| int dupfd; |
| union node *vname; |
| char *_unused_expfname; |
| }; |
| |
| struct nhere { |
| smallint type; |
| union node *next; |
| int fd; |
| union node *doc; |
| }; |
| |
| struct nnot { |
| smallint type; |
| union node *com; |
| }; |
| |
| union node { |
| smallint type; |
| struct ncmd ncmd; |
| struct npipe npipe; |
| struct nredir nredir; |
| struct nbinary nbinary; |
| struct nif nif; |
| struct nfor nfor; |
| struct ncase ncase; |
| struct nclist nclist; |
| struct narg narg; |
| struct nfile nfile; |
| struct ndup ndup; |
| struct nhere nhere; |
| struct nnot nnot; |
| }; |
| |
| /* |
| * NODE_EOF is returned by parsecmd when it encounters an end of file. |
| * It must be distinct from NULL. |
| */ |
| #define NODE_EOF ((union node *) -1L) |
| |
| struct nodelist { |
| struct nodelist *next; |
| union node *n; |
| }; |
| |
| struct funcnode { |
| int count; |
| union node n; |
| }; |
| |
| /* |
| * Free a parse tree. |
| */ |
| static void |
| freefunc(struct funcnode *f) |
| { |
| if (f && --f->count < 0) |
| free(f); |
| } |
| |
| |
| /* ============ Debugging output */ |
| |
| #if DEBUG |
| |
| static FILE *tracefile; |
| |
| static void |
| trace_printf(const char *fmt, ...) |
| { |
| va_list va; |
| |
| if (debug != 1) |
| return; |
| if (DEBUG_TIME) |
| fprintf(tracefile, "%u ", (int) time(NULL)); |
| if (DEBUG_PID) |
| fprintf(tracefile, "[%u] ", (int) getpid()); |
| if (DEBUG_SIG) |
| fprintf(tracefile, "pending s:%d i:%d(supp:%d) ", pending_sig, pending_int, suppress_int); |
| va_start(va, fmt); |
| vfprintf(tracefile, fmt, va); |
| va_end(va); |
| } |
| |
| static void |
| trace_vprintf(const char *fmt, va_list va) |
| { |
| if (debug != 1) |
| return; |
| vfprintf(tracefile, fmt, va); |
| fprintf(tracefile, "\n"); |
| } |
| |
| static void |
| trace_puts(const char *s) |
| { |
| if (debug != 1) |
| return; |
| fputs(s, tracefile); |
| } |
| |
| static void |
| trace_puts_quoted(char *s) |
| { |
| char *p; |
| char c; |
| |
| if (debug != 1) |
| return; |
| putc('"', tracefile); |
| for (p = s; *p; p++) { |
| switch ((unsigned char)*p) { |
| case '\n': c = 'n'; goto backslash; |
| case '\t': c = 't'; goto backslash; |
| case '\r': c = 'r'; goto backslash; |
| case '\"': c = '\"'; goto backslash; |
| case '\\': c = '\\'; goto backslash; |
| case CTLESC: c = 'e'; goto backslash; |
| case CTLVAR: c = 'v'; goto backslash; |
| case CTLBACKQ: c = 'q'; goto backslash; |
| backslash: |
| putc('\\', tracefile); |
| putc(c, tracefile); |
| break; |
| default: |
| if (*p >= ' ' && *p <= '~') |
| putc(*p, tracefile); |
| else { |
| putc('\\', tracefile); |
| putc((*p >> 6) & 03, tracefile); |
| putc((*p >> 3) & 07, tracefile); |
| putc(*p & 07, tracefile); |
| } |
| break; |
| } |
| } |
| putc('"', tracefile); |
| } |
| |
| static void |
| trace_puts_args(char **ap) |
| { |
| if (debug != 1) |
| return; |
| if (!*ap) |
| return; |
| while (1) { |
| trace_puts_quoted(*ap); |
| if (!*++ap) { |
| putc('\n', tracefile); |
| break; |
| } |
| putc(' ', tracefile); |
| } |
| } |
| |
| static void |
| opentrace(void) |
| { |
| char s[100]; |
| #ifdef O_APPEND |
| int flags; |
| #endif |
| |
| if (debug != 1) { |
| if (tracefile) |
| fflush(tracefile); |
| /* leave open because libedit might be using it */ |
| return; |
| } |
| strcpy(s, "./trace"); |
| if (tracefile) { |
| if (!freopen(s, "a", tracefile)) { |
| fprintf(stderr, "Can't re-open %s\n", s); |
| debug = 0; |
| return; |
| } |
| } else { |
| tracefile = fopen(s, "a"); |
| if (tracefile == NULL) { |
| fprintf(stderr, "Can't open %s\n", s); |
| debug = 0; |
| return; |
| } |
| } |
| #ifdef O_APPEND |
| flags = fcntl(fileno(tracefile), F_GETFL); |
| if (flags >= 0) |
| fcntl(fileno(tracefile), F_SETFL, flags | O_APPEND); |
| #endif |
| setlinebuf(tracefile); |
| fputs("\nTracing started.\n", tracefile); |
| } |
| |
| static void |
| indent(int amount, char *pfx, FILE *fp) |
| { |
| int i; |
| |
| for (i = 0; i < amount; i++) { |
| if (pfx && i == amount - 1) |
| fputs(pfx, fp); |
| putc('\t', fp); |
| } |
| } |
| |
| /* little circular references here... */ |
| static void shtree(union node *n, int ind, char *pfx, FILE *fp); |
| |
| static void |
| sharg(union node *arg, FILE *fp) |
| { |
| char *p; |
| struct nodelist *bqlist; |
| unsigned char subtype; |
| |
| if (arg->type != NARG) { |
| out1fmt("<node type %d>\n", arg->type); |
| abort(); |
| } |
| bqlist = arg->narg.backquote; |
| for (p = arg->narg.text; *p; p++) { |
| switch ((unsigned char)*p) { |
| case CTLESC: |
| p++; |
| putc(*p, fp); |
| break; |
| case CTLVAR: |
| putc('$', fp); |
| putc('{', fp); |
| subtype = *++p; |
| if (subtype == VSLENGTH) |
| putc('#', fp); |
| |
| while (*p != '=') { |
| putc(*p, fp); |
| p++; |
| } |
| |
| if (subtype & VSNUL) |
| putc(':', fp); |
| |
| switch (subtype & VSTYPE) { |
| case VSNORMAL: |
| putc('}', fp); |
| break; |
| case VSMINUS: |
| putc('-', fp); |
| break; |
| case VSPLUS: |
| putc('+', fp); |
| break; |
| case VSQUESTION: |
| putc('?', fp); |
| break; |
| case VSASSIGN: |
| putc('=', fp); |
| break; |
| case VSTRIMLEFT: |
| putc('#', fp); |
| break; |
| case VSTRIMLEFTMAX: |
| putc('#', fp); |
| putc('#', fp); |
| break; |
| case VSTRIMRIGHT: |
| putc('%', fp); |
| break; |
| case VSTRIMRIGHTMAX: |
| putc('%', fp); |
| putc('%', fp); |
| break; |
| case VSLENGTH: |
| break; |
| default: |
| out1fmt("<subtype %d>", subtype); |
| } |
| break; |
| case CTLENDVAR: |
| putc('}', fp); |
| break; |
| case CTLBACKQ: |
| putc('$', fp); |
| putc('(', fp); |
| shtree(bqlist->n, -1, NULL, fp); |
| putc(')', fp); |
| break; |
| default: |
| putc(*p, fp); |
| break; |
| } |
| } |
| } |
| |
| static void |
| shcmd(union node *cmd, FILE *fp) |
| { |
| union node *np; |
| int first; |
| const char *s; |
| int dftfd; |
| |
| first = 1; |
| for (np = cmd->ncmd.args; np; np = np->narg.next) { |
| if (!first) |
| putc(' ', fp); |
| sharg(np, fp); |
| first = 0; |
| } |
| for (np = cmd->ncmd.redirect; np; np = np->nfile.next) { |
| if (!first) |
| putc(' ', fp); |
| dftfd = 0; |
| switch (np->nfile.type) { |
| case NTO: s = ">>"+1; dftfd = 1; break; |
| case NCLOBBER: s = ">|"; dftfd = 1; break; |
| case NAPPEND: s = ">>"; dftfd = 1; break; |
| #if BASH_REDIR_OUTPUT |
| case NTO2: |
| #endif |
| case NTOFD: s = ">&"; dftfd = 1; break; |
| case NFROM: s = "<"; break; |
| case NFROMFD: s = "<&"; break; |
| case NFROMTO: s = "<>"; break; |
| default: s = "*error*"; break; |
| } |
| if (np->nfile.fd != dftfd) |
| fprintf(fp, "%d", np->nfile.fd); |
| fputs(s, fp); |
| if (np->nfile.type == NTOFD || np->nfile.type == NFROMFD) { |
| fprintf(fp, "%d", np->ndup.dupfd); |
| } else { |
| sharg(np->nfile.fname, fp); |
| } |
| first = 0; |
| } |
| } |
| |
| static void |
| shtree(union node *n, int ind, char *pfx, FILE *fp) |
| { |
| struct nodelist *lp; |
| const char *s; |
| |
| if (n == NULL) |
| return; |
| |
| indent(ind, pfx, fp); |
| |
| if (n == NODE_EOF) { |
| fputs("<EOF>", fp); |
| return; |
| } |
| |
| switch (n->type) { |
| case NSEMI: |
| s = "; "; |
| goto binop; |
| case NAND: |
| s = " && "; |
| goto binop; |
| case NOR: |
| s = " || "; |
| binop: |
| shtree(n->nbinary.ch1, ind, NULL, fp); |
| /* if (ind < 0) */ |
| fputs(s, fp); |
| shtree(n->nbinary.ch2, ind, NULL, fp); |
| break; |
| case NCMD: |
| shcmd(n, fp); |
| if (ind >= 0) |
| putc('\n', fp); |
| break; |
| case NPIPE: |
| for (lp = n->npipe.cmdlist; lp; lp = lp->next) { |
| shtree(lp->n, 0, NULL, fp); |
| if (lp->next) |
| fputs(" | ", fp); |
| } |
| if (n->npipe.pipe_backgnd) |
| fputs(" &", fp); |
| if (ind >= 0) |
| putc('\n', fp); |
| break; |
| default: |
| fprintf(fp, "<node type %d>", n->type); |
| if (ind >= 0) |
| putc('\n', fp); |
| break; |
| } |
| } |
| |
| static void |
| showtree(union node *n) |
| { |
| trace_puts("showtree called\n"); |
| shtree(n, 1, NULL, stderr); |
| } |
| |
| #endif /* DEBUG */ |
| |
| |
| /* ============ Parser data */ |
| |
| /* |
| * ash_vmsg() needs parsefile->fd, hence parsefile definition is moved up. |
| */ |
| struct strlist { |
| struct strlist *next; |
| char *text; |
| }; |
| |
| struct alias; |
| |
| struct strpush { |
| struct strpush *prev; /* preceding string on stack */ |
| char *prev_string; |
| int prev_left_in_line; |
| #if ENABLE_ASH_ALIAS |
| struct alias *ap; /* if push was associated with an alias */ |
| #endif |
| char *string; /* remember the string since it may change */ |
| |
| /* Remember last two characters for pungetc. */ |
| int lastc[2]; |
| |
| /* Number of outstanding calls to pungetc. */ |
| int unget; |
| }; |
| |
| struct parsefile { |
| struct parsefile *prev; /* preceding file on stack */ |
| int linno; /* current line */ |
| int pf_fd; /* file descriptor (or -1 if string) */ |
| int left_in_line; /* number of chars left in this line */ |
| int left_in_buffer; /* number of chars left in this buffer past the line */ |
| char *next_to_pgetc; /* next char in buffer */ |
| char *buf; /* input buffer */ |
| struct strpush *strpush; /* for pushing strings at this level */ |
| struct strpush basestrpush; /* so pushing one is fast */ |
| |
| /* Remember last two characters for pungetc. */ |
| int lastc[2]; |
| |
| /* Number of outstanding calls to pungetc. */ |
| int unget; |
| }; |
| |
| static struct parsefile basepf; /* top level input file */ |
| static struct parsefile *g_parsefile = &basepf; /* current input file */ |
| static int startlinno; /* line # where last token started */ |
| static char *commandname; /* currently executing command */ |
| static struct strlist *cmdenviron; /* environment for builtin command */ |
| |
| |
| /* ============ Message printing */ |
| |
| static void |
| ash_vmsg(const char *msg, va_list ap) |
| { |
| fprintf(stderr, "%s: ", arg0); |
| if (commandname) { |
| if (strcmp(arg0, commandname)) |
| fprintf(stderr, "%s: ", commandname); |
| if (!iflag || g_parsefile->pf_fd > 0) |
| fprintf(stderr, "line %d: ", startlinno); |
| } |
| vfprintf(stderr, msg, ap); |
| newline_and_flush(stderr); |
| } |
| |
| /* |
| * Exverror is called to raise the error exception. If the second argument |
| * is not NULL then error prints an error message using printf style |
| * formatting. It then raises the error exception. |
| */ |
| static void ash_vmsg_and_raise(int, const char *, va_list) NORETURN; |
| static void |
| ash_vmsg_and_raise(int cond, const char *msg, va_list ap) |
| { |
| #if DEBUG |
| if (msg) { |
| TRACE(("ash_vmsg_and_raise(%d):", cond)); |
| TRACEV((msg, ap)); |
| } else |
| TRACE(("ash_vmsg_and_raise(%d):NULL\n", cond)); |
| if (msg) |
| #endif |
| ash_vmsg(msg, ap); |
| |
| flush_stdout_stderr(); |
| raise_exception(cond); |
| /* NOTREACHED */ |
| } |
| |
| static void ash_msg_and_raise_error(const char *, ...) NORETURN; |
| static void |
| ash_msg_and_raise_error(const char *msg, ...) |
| { |
| va_list ap; |
| |
| exitstatus = 2; |
| |
| va_start(ap, msg); |
| ash_vmsg_and_raise(EXERROR, msg, ap); |
| /* NOTREACHED */ |
| va_end(ap); |
| } |
| |
| static void raise_error_syntax(const char *) NORETURN; |
| static void |
| raise_error_syntax(const char *msg) |
| { |
| ash_msg_and_raise_error("syntax error: %s", msg); |
| /* NOTREACHED */ |
| } |
| |
| static void ash_msg_and_raise(int, const char *, ...) NORETURN; |
| static void |
| ash_msg_and_raise(int cond, const char *msg, ...) |
| { |
| va_list ap; |
| |
| va_start(ap, msg); |
| ash_vmsg_and_raise(cond, msg, ap); |
| /* NOTREACHED */ |
| va_end(ap); |
| } |
| |
| /* |
| * error/warning routines for external builtins |
| */ |
| static void |
| ash_msg(const char *fmt, ...) |
| { |
| va_list ap; |
| |
| va_start(ap, fmt); |
| ash_vmsg(fmt, ap); |
| va_end(ap); |
| } |
| |
| /* |
| * Return a string describing an error. The returned string may be a |
| * pointer to a static buffer that will be overwritten on the next call. |
| * Action describes the operation that got the error. |
| */ |
| static const char * |
| errmsg(int e, const char *em) |
| { |
| if (e == ENOENT || e == ENOTDIR) { |
| return em; |
| } |
| return strerror(e); |
| } |
| |
| |
| /* ============ Memory allocation */ |
| |
| #if 0 |
| /* I consider these wrappers nearly useless: |
| * ok, they return you to nearest exception handler, but |
| * how much memory do you leak in the process, making |
| * memory starvation worse? |
| */ |
| static void * |
| ckrealloc(void * p, size_t nbytes) |
| { |
| p = realloc(p, nbytes); |
| if (!p) |
| ash_msg_and_raise_error(bb_msg_memory_exhausted); |
| return p; |
| } |
| |
| static void * |
| ckmalloc(size_t nbytes) |
| { |
| return ckrealloc(NULL, nbytes); |
| } |
| |
| static void * |
| ckzalloc(size_t nbytes) |
| { |
| return memset(ckmalloc(nbytes), 0, nbytes); |
| } |
| |
| static char * |
| ckstrdup(const char *s) |
| { |
| char *p = strdup(s); |
| if (!p) |
| ash_msg_and_raise_error(bb_msg_memory_exhausted); |
| return p; |
| } |
| #else |
| /* Using bbox equivalents. They exit if out of memory */ |
| # define ckrealloc xrealloc |
| # define ckmalloc xmalloc |
| # define ckzalloc xzalloc |
| # define ckstrdup xstrdup |
| #endif |
| |
| /* |
| * It appears that grabstackstr() will barf with such alignments |
| * because stalloc() will return a string allocated in a new stackblock. |
| */ |
| #define SHELL_ALIGN(nbytes) (((nbytes) + SHELL_SIZE) & ~SHELL_SIZE) |
| enum { |
| /* Most machines require the value returned from malloc to be aligned |
| * in some way. The following macro will get this right |
| * on many machines. */ |
| SHELL_SIZE = sizeof(union { int i; char *cp; double d; }) - 1, |
| /* Minimum size of a block */ |
| MINSIZE = SHELL_ALIGN(504), |
| }; |
| |
| struct stack_block { |
| struct stack_block *prev; |
| char space[MINSIZE]; |
| }; |
| |
| struct stackmark { |
| struct stack_block *stackp; |
| char *stacknxt; |
| size_t stacknleft; |
| }; |
| |
| |
| struct globals_memstack { |
| struct stack_block *g_stackp; // = &stackbase; |
| char *g_stacknxt; // = stackbase.space; |
| char *sstrend; // = stackbase.space + MINSIZE; |
| size_t g_stacknleft; // = MINSIZE; |
| struct stack_block stackbase; |
| }; |
| extern struct globals_memstack *const ash_ptr_to_globals_memstack; |
| #define G_memstack (*ash_ptr_to_globals_memstack) |
| #define g_stackp (G_memstack.g_stackp ) |
| #define g_stacknxt (G_memstack.g_stacknxt ) |
| #define sstrend (G_memstack.sstrend ) |
| #define g_stacknleft (G_memstack.g_stacknleft) |
| #define stackbase (G_memstack.stackbase ) |
| #define INIT_G_memstack() do { \ |
| (*(struct globals_memstack**)&ash_ptr_to_globals_memstack) = xzalloc(sizeof(G_memstack)); \ |
| barrier(); \ |
| g_stackp = &stackbase; \ |
| g_stacknxt = stackbase.space; \ |
| g_stacknleft = MINSIZE; \ |
| sstrend = stackbase.space + MINSIZE; \ |
| } while (0) |
| |
| |
| #define stackblock() ((void *)g_stacknxt) |
| #define stackblocksize() g_stacknleft |
| |
| /* |
| * Parse trees for commands are allocated in lifo order, so we use a stack |
| * to make this more efficient, and also to avoid all sorts of exception |
| * handling code to handle interrupts in the middle of a parse. |
| * |
| * The size 504 was chosen because the Ultrix malloc handles that size |
| * well. |
| */ |
| static void * |
| stalloc(size_t nbytes) |
| { |
| char *p; |
| size_t aligned; |
| |
| aligned = SHELL_ALIGN(nbytes); |
| if (aligned > g_stacknleft) { |
| size_t len; |
| size_t blocksize; |
| struct stack_block *sp; |
| |
| blocksize = aligned; |
| if (blocksize < MINSIZE) |
| blocksize = MINSIZE; |
| len = sizeof(struct stack_block) - MINSIZE + blocksize; |
| if (len < blocksize) |
| ash_msg_and_raise_error(bb_msg_memory_exhausted); |
| INT_OFF; |
| sp = ckmalloc(len); |
| sp->prev = g_stackp; |
| g_stacknxt = sp->space; |
| g_stacknleft = blocksize; |
| sstrend = g_stacknxt + blocksize; |
| g_stackp = sp; |
| INT_ON; |
| } |
| p = g_stacknxt; |
| g_stacknxt += aligned; |
| g_stacknleft -= aligned; |
| return p; |
| } |
| |
| static void * |
| stzalloc(size_t nbytes) |
| { |
| return memset(stalloc(nbytes), 0, nbytes); |
| } |
| |
| static void |
| stunalloc(void *p) |
| { |
| #if DEBUG |
| if (!p || (g_stacknxt < (char *)p) || ((char *)p < g_stackp->space)) { |
| write(STDERR_FILENO, "stunalloc\n", 10); |
| abort(); |
| } |
| #endif |
| g_stacknleft += g_stacknxt - (char *)p; |
| g_stacknxt = p; |
| } |
| |
| /* |
| * Like strdup but works with the ash stack. |
| */ |
| static char * |
| sstrdup(const char *p) |
| { |
| size_t len = strlen(p) + 1; |
| return memcpy(stalloc(len), p, len); |
| } |
| |
| static inline void |
| grabstackblock(size_t len) |
| { |
| stalloc(len); |
| } |
| |
| static void |
| pushstackmark(struct stackmark *mark, size_t len) |
| { |
| mark->stackp = g_stackp; |
| mark->stacknxt = g_stacknxt; |
| mark->stacknleft = g_stacknleft; |
| grabstackblock(len); |
| } |
| |
| static void |
| setstackmark(struct stackmark *mark) |
| { |
| pushstackmark(mark, g_stacknxt == g_stackp->space && g_stackp != &stackbase); |
| } |
| |
| static void |
| popstackmark(struct stackmark *mark) |
| { |
| struct stack_block *sp; |
| |
| if (!mark->stackp) |
| return; |
| |
| INT_OFF; |
| while (g_stackp != mark->stackp) { |
| sp = g_stackp; |
| g_stackp = sp->prev; |
| free(sp); |
| } |
| g_stacknxt = mark->stacknxt; |
| g_stacknleft = mark->stacknleft; |
| sstrend = mark->stacknxt + mark->stacknleft; |
| INT_ON; |
| } |
| |
| /* |
| * When the parser reads in a string, it wants to stick the string on the |
| * stack and only adjust the stack pointer when it knows how big the |
| * string is. Stackblock (defined in stack.h) returns a pointer to a block |
| * of space on top of the stack and stackblocklen returns the length of |
| * this block. Growstackblock will grow this space by at least one byte, |
| * possibly moving it (like realloc). Grabstackblock actually allocates the |
| * part of the block that has been used. |
| */ |
| static void |
| growstackblock(void) |
| { |
| size_t newlen; |
| |
| newlen = g_stacknleft * 2; |
| if (newlen < g_stacknleft) |
| ash_msg_and_raise_error(bb_msg_memory_exhausted); |
| if (newlen < 128) |
| newlen += 128; |
| |
| if (g_stacknxt == g_stackp->space && g_stackp != &stackbase) { |
| struct stack_block *sp; |
| struct stack_block *prevstackp; |
| size_t grosslen; |
| |
| INT_OFF; |
| sp = g_stackp; |
| prevstackp = sp->prev; |
| grosslen = newlen + sizeof(struct stack_block) - MINSIZE; |
| sp = ckrealloc(sp, grosslen); |
| sp->prev = prevstackp; |
| g_stackp = sp; |
| g_stacknxt = sp->space; |
| g_stacknleft = newlen; |
| sstrend = sp->space + newlen; |
| INT_ON; |
| } else { |
| char *oldspace = g_stacknxt; |
| size_t oldlen = g_stacknleft; |
| char *p = stalloc(newlen); |
| |
| /* free the space we just allocated */ |
| g_stacknxt = memcpy(p, oldspace, oldlen); |
| g_stacknleft += newlen; |
| } |
| } |
| |
| /* |
| * The following routines are somewhat easier to use than the above. |
| * The user declares a variable of type STACKSTR, which may be declared |
| * to be a register. The macro STARTSTACKSTR initializes things. Then |
| * the user uses the macro STPUTC to add characters to the string. In |
| * effect, STPUTC(c, p) is the same as *p++ = c except that the stack is |
| * grown as necessary. When the user is done, she can just leave the |
| * string there and refer to it using stackblock(). Or she can allocate |
| * the space for it using grabstackstr(). If it is necessary to allow |
| * someone else to use the stack temporarily and then continue to grow |
| * the string, the user should use grabstack to allocate the space, and |
| * then call ungrabstr(p) to return to the previous mode of operation. |
| * |
| * USTPUTC is like STPUTC except that it doesn't check for overflow. |
| * CHECKSTACKSPACE can be called before USTPUTC to ensure that there |
| * is space for at least one character. |
| */ |
| static void * |
| growstackstr(void) |
| { |
| size_t len = stackblocksize(); |
| growstackblock(); |
| return (char *)stackblock() + len; |
| } |
| |
| /* |
| * Called from CHECKSTRSPACE. |
| */ |
| static char * |
| makestrspace(size_t newlen, char *p) |
| { |
| size_t len = p - g_stacknxt; |
| size_t size; |
| |
| for (;;) { |
| size_t nleft; |
| |
| size = stackblocksize(); |
| nleft = size - len; |
| if (nleft >= newlen) |
| break; |
| growstackblock(); |
| } |
| return (char *)stackblock() + len; |
| } |
| |
| static char * |
| stack_nputstr(const char *s, size_t n, char *p) |
| { |
| p = makestrspace(n, p); |
| p = (char *)memcpy(p, s, n) + n; |
| return p; |
| } |
| |
| static char * |
| stack_putstr(const char *s, char *p) |
| { |
| return stack_nputstr(s, strlen(s), p); |
| } |
| |
| static char * |
| _STPUTC(int c, char *p) |
| { |
| if (p == sstrend) |
| p = growstackstr(); |
| *p++ = c; |
| return p; |
| } |
| |
| #define STARTSTACKSTR(p) ((p) = stackblock()) |
| #define STPUTC(c, p) ((p) = _STPUTC((c), (p))) |
| #define CHECKSTRSPACE(n, p) do { \ |
| char *q = (p); \ |
| size_t l = (n); \ |
| size_t m = sstrend - q; \ |
| if (l > m) \ |
| (p) = makestrspace(l, q); \ |
| } while (0) |
| #define USTPUTC(c, p) (*(p)++ = (c)) |
| #define STACKSTRNUL(p) do { \ |
| if ((p) == sstrend) \ |
| (p) = growstackstr(); \ |
| *(p) = '\0'; \ |
| } while (0) |
| #define STUNPUTC(p) (--(p)) |
| #define STTOPC(p) ((p)[-1]) |
| #define STADJUST(amount, p) ((p) += (amount)) |
| |
| #define grabstackstr(p) stalloc((char *)(p) - (char *)stackblock()) |
| #define ungrabstackstr(s, p) stunalloc(s) |
| #define stackstrend() ((void *)sstrend) |
| |
| |
| /* ============ String helpers */ |
| |
| /* |
| * prefix -- see if pfx is a prefix of string. |
| */ |
| static char * |
| prefix(const char *string, const char *pfx) |
| { |
| while (*pfx) { |
| if (*pfx++ != *string++) |
| return NULL; |
| } |
| return (char *) string; |
| } |
| |
| /* |
| * Check for a valid number. This should be elsewhere. |
| */ |
| static int |
| is_number(const char *p) |
| { |
| do { |
| if (!isdigit(*p)) |
| return 0; |
| } while (*++p != '\0'); |
| return 1; |
| } |
| |
| /* |
| * Convert a string of digits to an integer, printing an error message on |
| * failure. |
| */ |
| static int |
| number(const char *s) |
| { |
| if (!is_number(s)) |
| ash_msg_and_raise_error(msg_illnum, s); |
| return atoi(s); |
| } |
| |
| /* |
| * Produce a possibly single quoted string suitable as input to the shell. |
| * The return string is allocated on the stack. |
| */ |
| static char * |
| single_quote(const char *s) |
| { |
| char *p; |
| |
| STARTSTACKSTR(p); |
| |
| do { |
| char *q; |
| size_t len; |
| |
| len = strchrnul(s, '\'') - s; |
| |
| q = p = makestrspace(len + 3, p); |
| |
| *q++ = '\''; |
| q = (char *)memcpy(q, s, len) + len; |
| *q++ = '\''; |
| s += len; |
| |
| STADJUST(q - p, p); |
| |
| if (*s != '\'') |
| break; |
| len = 0; |
| do len++; while (*++s == '\''); |
| |
| q = p = makestrspace(len + 3, p); |
| |
| *q++ = '"'; |
| q = (char *)memcpy(q, s - len, len) + len; |
| *q++ = '"'; |
| |
| STADJUST(q - p, p); |
| } while (*s); |
| |
| USTPUTC('\0', p); |
| |
| return stackblock(); |
| } |
| |
| |
| /* ============ nextopt */ |
| |
| static char **argptr; /* argument list for builtin commands */ |
| static char *optionarg; /* set by nextopt (like getopt) */ |
| static char *optptr; /* used by nextopt */ |
| |
| /* |
| * XXX - should get rid of. Have all builtins use getopt(3). |
| * The library getopt must have the BSD extension static variable |
| * "optreset", otherwise it can't be used within the shell safely. |
| * |
| * Standard option processing (a la getopt) for builtin routines. |
| * The only argument that is passed to nextopt is the option string; |
| * the other arguments are unnecessary. It returns the character, |
| * or '\0' on end of input. |
| */ |
| static int |
| nextopt(const char *optstring) |
| { |
| char *p; |
| const char *q; |
| char c; |
| |
| p = optptr; |
| if (p == NULL || *p == '\0') { |
| /* We ate entire "-param", take next one */ |
| p = *argptr; |
| if (p == NULL) |
| return '\0'; |
| if (*p != '-') |
| return '\0'; |
| if (*++p == '\0') /* just "-" ? */ |
| return '\0'; |
| argptr++; |
| if (LONE_DASH(p)) /* "--" ? */ |
| return '\0'; |
| /* p => next "-param" */ |
| } |
| /* p => some option char in the middle of a "-param" */ |
| c = *p++; |
| for (q = optstring; *q != c;) { |
| if (*q == '\0') |
| ash_msg_and_raise_error("illegal option -%c", c); |
| if (*++q == ':') |
| q++; |
| } |
| if (*++q == ':') { |
| if (*p == '\0') { |
| p = *argptr++; |
| if (p == NULL) |
| ash_msg_and_raise_error("no arg for -%c option", c); |
| } |
| optionarg = p; |
| p = NULL; |
| } |
| optptr = p; |
| return c; |
| } |
| |
| |
| /* ============ Shell variables */ |
| |
| /* |
| * The parsefile structure pointed to by the global variable parsefile |
| * contains information about the current file being read. |
| */ |
| struct shparam { |
| int nparam; /* # of positional parameters (without $0) */ |
| #if ENABLE_ASH_GETOPTS |
| int optind; /* next parameter to be processed by getopts */ |
| int optoff; /* used by getopts */ |
| #endif |
| unsigned char malloced; /* if parameter list dynamically allocated */ |
| char **p; /* parameter list */ |
| }; |
| |
| /* |
| * Free the list of positional parameters. |
| */ |
| static void |
| freeparam(volatile struct shparam *param) |
| { |
| if (param->malloced) { |
| char **ap, **ap1; |
| ap = ap1 = param->p; |
| while (*ap) |
| free(*ap++); |
| free(ap1); |
| } |
| } |
| |
| #if ENABLE_ASH_GETOPTS |
| static void FAST_FUNC getoptsreset(const char *value); |
| #endif |
| |
| struct var { |
| struct var *next; /* next entry in hash list */ |
| int flags; /* flags are defined above */ |
| const char *var_text; /* name=value */ |
| void (*var_func)(const char *) FAST_FUNC; /* function to be called when */ |
| /* the variable gets set/unset */ |
| }; |
| |
| struct localvar { |
| struct localvar *next; /* next local variable in list */ |
| struct var *vp; /* the variable that was made local */ |
| int flags; /* saved flags */ |
| const char *text; /* saved text */ |
| }; |
| |
| /* flags */ |
| #define VEXPORT 0x01 /* variable is exported */ |
| #define VREADONLY 0x02 /* variable cannot be modified */ |
| #define VSTRFIXED 0x04 /* variable struct is statically allocated */ |
| #define VTEXTFIXED 0x08 /* text is statically allocated */ |
| #define VSTACK 0x10 /* text is allocated on the stack */ |
| #define VUNSET 0x20 /* the variable is not set */ |
| #define VNOFUNC 0x40 /* don't call the callback function */ |
| #define VNOSET 0x80 /* do not set variable - just readonly test */ |
| #define VNOSAVE 0x100 /* when text is on the heap before setvareq */ |
| #if ENABLE_ASH_RANDOM_SUPPORT |
| # define VDYNAMIC 0x200 /* dynamic variable */ |
| #else |
| # define VDYNAMIC 0 |
| #endif |
| |
| |
| /* Need to be before varinit_data[] */ |
| #if ENABLE_LOCALE_SUPPORT |
| static void FAST_FUNC |
| change_lc_all(const char *value) |
| { |
| if (value && *value != '\0') |
| setlocale(LC_ALL, value); |
| } |
| static void FAST_FUNC |
| change_lc_ctype(const char *value) |
| { |
| if (value && *value != '\0') |
| setlocale(LC_CTYPE, value); |
| } |
| #endif |
| #if ENABLE_ASH_MAIL |
| static void chkmail(void); |
| static void changemail(const char *var_value) FAST_FUNC; |
| #else |
| # define chkmail() ((void)0) |
| #endif |
| static void changepath(const char *) FAST_FUNC; |
| #if ENABLE_ASH_RANDOM_SUPPORT |
| static void change_random(const char *) FAST_FUNC; |
| #endif |
| |
| static const struct { |
| int flags; |
| const char *var_text; |
| void (*var_func)(const char *) FAST_FUNC; |
| } varinit_data[] = { |
| /* |
| * Note: VEXPORT would not work correctly here for NOFORK applets: |
| * some environment strings may be constant. |
| */ |
| { VSTRFIXED|VTEXTFIXED , defifsvar , NULL }, |
| #if ENABLE_ASH_MAIL |
| { VSTRFIXED|VTEXTFIXED|VUNSET, "MAIL" , changemail }, |
| { VSTRFIXED|VTEXTFIXED|VUNSET, "MAILPATH" , changemail }, |
| #endif |
| { VSTRFIXED|VTEXTFIXED , bb_PATH_root_path, changepath }, |
| { VSTRFIXED|VTEXTFIXED , "PS1=$ " , NULL }, |
| { VSTRFIXED|VTEXTFIXED , "PS2=> " , NULL }, |
| { VSTRFIXED|VTEXTFIXED , "PS4=+ " , NULL }, |
| #if ENABLE_ASH_GETOPTS |
| { VSTRFIXED|VTEXTFIXED , defoptindvar, getoptsreset }, |
| #endif |
| #if ENABLE_ASH_RANDOM_SUPPORT |
| { VSTRFIXED|VTEXTFIXED|VUNSET|VDYNAMIC, "RANDOM", change_random }, |
| #endif |
| #if ENABLE_LOCALE_SUPPORT |
| { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_ALL" , change_lc_all }, |
| { VSTRFIXED|VTEXTFIXED|VUNSET, "LC_CTYPE" , change_lc_ctype }, |
| #endif |
| #if ENABLE_FEATURE_EDITING_SAVEHISTORY |
| { VSTRFIXED|VTEXTFIXED|VUNSET, "HISTFILE" , NULL }, |
| #endif |
| }; |
| |
| struct redirtab; |
| |
| struct globals_var { |
| struct shparam shellparam; /* $@ current positional parameters */ |
| struct redirtab *redirlist; |
| int preverrout_fd; /* save fd2 before print debug if xflag is set. */ |
| struct var *vartab[VTABSIZE]; |
| struct var varinit[ARRAY_SIZE(varinit_data)]; |
| }; |
| extern struct globals_var *const ash_ptr_to_globals_var; |
| #define G_var (*ash_ptr_to_globals_var) |
| #define shellparam (G_var.shellparam ) |
| //#define redirlist (G_var.redirlist ) |
| #define preverrout_fd (G_var.preverrout_fd) |
| #define vartab (G_var.vartab ) |
| #define varinit (G_var.varinit ) |
| #define INIT_G_var() do { \ |
| unsigned i; \ |
| (*(struct globals_var**)&ash_ptr_to_globals_var) = xzalloc(sizeof(G_var)); \ |
| barrier(); \ |
| for (i = 0; i < ARRAY_SIZE(varinit_data); i++) { \ |
| varinit[i].flags = varinit_data[i].flags; \ |
| varinit[i].var_text = varinit_data[i].var_text; \ |
| varinit[i].var_func = varinit_data[i].var_func; \ |
| } \ |
| } while (0) |
| |
| #define vifs varinit[0] |
| #if ENABLE_ASH_MAIL |
| # define vmail (&vifs)[1] |
| # define vmpath (&vmail)[1] |
| # define vpath (&vmpath)[1] |
| #else |
| # define vpath (&vifs)[1] |
| #endif |
| #define vps1 (&vpath)[1] |
| #define vps2 (&vps1)[1] |
| #define vps4 (&vps2)[1] |
| #if ENABLE_ASH_GETOPTS |
| # define voptind (&vps4)[1] |
| # if ENABLE_ASH_RANDOM_SUPPORT |
| # define vrandom (&voptind)[1] |
| # endif |
| #else |
| # if ENABLE_ASH_RANDOM_SUPPORT |
| # define vrandom (&vps4)[1] |
| # endif |
| #endif |
| |
| /* |
| * The following macros access the values of the above variables. |
| * They have to skip over the name. They return the null string |
| * for unset variables. |
| */ |
| #define ifsval() (vifs.var_text + 4) |
| #define ifsset() ((vifs.flags & VUNSET) == 0) |
| #if ENABLE_ASH_MAIL |
| # define mailval() (vmail.var_text + 5) |
| # define mpathval() (vmpath.var_text + 9) |
| # define mpathset() ((vmpath.flags & VUNSET) == 0) |
| #endif |
| #define pathval() (vpath.var_text + 5) |
| #define ps1val() (vps1.var_text + 4) |
| #define ps2val() (vps2.var_text + 4) |
| #define ps4val() (vps4.var_text + 4) |
| #if ENABLE_ASH_GETOPTS |
| # define optindval() (voptind.var_text + 7) |
| #endif |
| |
| #if ENABLE_ASH_GETOPTS |
| static void FAST_FUNC |
| getoptsreset(const char *value) |
| { |
| shellparam.optind = number(value) ?: 1; |
| shellparam.optoff = -1; |
| } |
| #endif |
| |
| /* |
| * Compares two strings up to the first = or '\0'. The first |
| * string must be terminated by '='; the second may be terminated by |
| * either '=' or '\0'. |
| */ |
| static int |
| varcmp(const char *p, const char *q) |
| { |
| int c, d; |
| |
| while ((c = *p) == (d = *q)) { |
| if (c == '\0' || c == '=') |
| goto out; |
| p++; |
| q++; |
| } |
| if (c == '=') |
| c = '\0'; |
| if (d == '=') |
| d = '\0'; |
| out: |
| return c - d; |
| } |
| |
| /* |
| * Find the appropriate entry in the hash table from the name. |
| */ |
| static struct var ** |
| hashvar(const char *p) |
| { |
| unsigned hashval; |
| |
| hashval = ((unsigned char) *p) << 4; |
| while (*p && *p != '=') |
| hashval += (unsigned char) *p++; |
| return &vartab[hashval % VTABSIZE]; |
| } |
| |
| static int |
| vpcmp(const void *a, const void *b) |
| { |
| return varcmp(*(const char **)a, *(const char **)b); |
| } |
| |
| /* |
| * This routine initializes the builtin variables. |
| */ |
| static void |
| initvar(void) |
| { |
| struct var *vp; |
| struct var *end; |
| struct var **vpp; |
| |
| /* |
| * PS1 depends on uid |
| */ |
| #if ENABLE_FEATURE_EDITING && ENABLE_FEATURE_EDITING_FANCY_PROMPT |
| vps1.var_text = "PS1=\\w \\$ "; |
| #else |
| if (!geteuid()) |
| vps1.var_text = "PS1=# "; |
| #endif |
| vp = varinit; |
| end = vp + ARRAY_SIZE(varinit); |
| do { |
| vpp = hashvar(vp->var_text); |
| vp->next = *vpp; |
| *vpp = vp; |
| } while (++vp < end); |
| } |
| |
| static struct var ** |
| findvar(struct var **vpp, const char *name) |
| { |
| for (; *vpp; vpp = &(*vpp)->next) { |
| if (varcmp((*vpp)->var_text, name) == 0) { |
| break; |
| } |
| } |
| return vpp; |
| } |
| |
| /* |
| * Find the value of a variable. Returns NULL if not set. |
| */ |
| static const char* FAST_FUNC |
| lookupvar(const char *name) |
| { |
| struct var *v; |
| |
| v = *findvar(hashvar(name), name); |
| if (v) { |
| #if ENABLE_ASH_RANDOM_SUPPORT |
| /* |
| * Dynamic variables are implemented roughly the same way they are |
| * in bash. Namely, they're "special" so long as they aren't unset. |
| * As soon as they're unset, they're no longer dynamic, and dynamic |
| * lookup will no longer happen at that point. -- PFM. |
| */ |
| if (v->flags & VDYNAMIC) |
| v->var_func(NULL); |
| #endif |
| if (!(v->flags & VUNSET)) |
| return var_end(v->var_text); |
| } |
| return NULL; |
| } |
| |
| #if ENABLE_UNICODE_SUPPORT |
| static void |
| reinit_unicode_for_ash(void) |
| { |
| /* Unicode support should be activated even if LANG is set |
| * _during_ shell execution, not only if it was set when |
| * shell was started. Therefore, re-check LANG every time: |
| */ |
| if (ENABLE_FEATURE_CHECK_UNICODE_IN_ENV |
| || ENABLE_UNICODE_USING_LOCALE |
| ) { |
| const char *s = lookupvar("LC_ALL"); |
| if (!s) s = lookupvar("LC_CTYPE"); |
| if (!s) s = lookupvar("LANG"); |
| reinit_unicode(s); |
| } |
| } |
| #else |
| # define reinit_unicode_for_ash() ((void)0) |
| #endif |
| |
| /* |
| * Search the environment of a builtin command. |
| */ |
| static const char * |
| bltinlookup(const char *name) |
| { |
| struct strlist *sp; |
| |
| for (sp = cmdenviron; sp; sp = sp->next) { |
| if (varcmp(sp->text, name) == 0) |
| return var_end(sp->text); |
| } |
| return lookupvar(name); |
| } |
| |
| /* |
| * Same as setvar except that the variable and value are passed in |
| * the first argument as name=value. Since the first argument will |
| * be actually stored in the table, it should not be a string that |
| * will go away. |
| * Called with interrupts off. |
| */ |
| static void |
| setvareq(char *s, int flags) |
| { |
| struct var *vp, **vpp; |
| |
| vpp = hashvar(s); |
| flags |= (VEXPORT & (((unsigned) (1 - aflag)) - 1)); |
| vp = *findvar(vpp, s); |
| if (vp) { |
| if ((vp->flags & (VREADONLY|VDYNAMIC)) == VREADONLY) { |
| const char *n; |
| |
| if (flags & VNOSAVE) |
| free(s); |
| n = vp->var_text; |
| exitstatus = 1; |
| ash_msg_and_raise_error("%.*s: is read only", strchrnul(n, '=') - n, n); |
| } |
| |
| if (flags & VNOSET) |
| return; |
| |
| if (vp->var_func && !(flags & VNOFUNC)) |
| vp->var_func(var_end(s)); |
| |
| if (!(vp->flags & (VTEXTFIXED|VSTACK))) |
| free((char*)vp->var_text); |
| |
| flags |= vp->flags & ~(VTEXTFIXED|VSTACK|VNOSAVE|VUNSET); |
| } else { |
| /* variable s is not found */ |
| if (flags & VNOSET) |
| return; |
| vp = ckzalloc(sizeof(*vp)); |
| vp->next = *vpp; |
| /*vp->func = NULL; - ckzalloc did it */ |
| *vpp = vp; |
| } |
| if (!(flags & (VTEXTFIXED|VSTACK|VNOSAVE))) |
| s = ckstrdup(s); |
| vp->var_text = s; |
| vp->flags = flags; |
| } |
| |
| /* |
| * Set the value of a variable. The flags argument is ored with the |
| * flags of the variable. If val is NULL, the variable is unset. |
| */ |
| static void |
| setvar(const char *name, const char *val, int flags) |
| { |
| const char *q; |
| char *p; |
| char *nameeq; |
| size_t namelen; |
| size_t vallen; |
| |
| q = endofname(name); |
| p = strchrnul(q, '='); |
| namelen = p - name; |
| if (!namelen || p != q) |
| ash_msg_and_raise_error("%.*s: bad variable name", namelen, name); |
| vallen = 0; |
| if (val == NULL) { |
| flags |= VUNSET; |
| } else { |
| vallen = strlen(val); |
| } |
| |
| INT_OFF; |
| nameeq = ckmalloc(namelen + vallen + 2); |
| p = memcpy(nameeq, name, namelen) + namelen; |
| if (val) { |
| *p++ = '='; |
| p = memcpy(p, val, vallen) + vallen; |
| } |
| *p = '\0'; |
| setvareq(nameeq, flags | VNOSAVE); |
| INT_ON; |
| } |
| |
| static void FAST_FUNC |
| setvar0(const char *name, const char *val) |
| { |
| setvar(name, val, 0); |
| } |
| |
| /* |
| * Unset the specified variable. |
| */ |
| static int |
| unsetvar(const char *s) |
| { |
| struct var **vpp; |
| struct var *vp; |
| int retval; |
| |
| vpp = findvar(hashvar(s), s); |
| vp = *vpp; |
| retval = 2; |
| if (vp) { |
| int flags = vp->flags; |
| |
| retval = 1; |
| if (flags & VREADONLY) |
| goto out; |
| #if ENABLE_ASH_RANDOM_SUPPORT |
| vp->flags &= ~VDYNAMIC; |
| #endif |
| if (flags & VUNSET) |
| goto ok; |
| if ((flags & VSTRFIXED) == 0) { |
| INT_OFF; |
| if ((flags & (VTEXTFIXED|VSTACK)) == 0) |
| free((char*)vp->var_text); |
| *vpp = vp->next; |
| free(vp); |
| INT_ON; |
| } else { |
| setvar0(s, NULL); |
| vp->flags &= ~VEXPORT; |
| } |
| ok: |
| retval = 0; |
| } |
| out: |
| return retval; |
| } |
| |
| /* |
| * Process a linked list of variable assignments. |
| */ |
| static void |
| listsetvar(struct strlist *list_set_var, int flags) |
| { |
| struct strlist *lp = list_set_var; |
| |
| if (!lp) |
| return; |
| INT_OFF; |
| do { |
| setvareq(lp->text, flags); |
| lp = lp->next; |
| } while (lp); |
| INT_ON; |
| } |
| |
| /* |
| * Generate a list of variables satisfying the given conditions. |
| */ |
| static char ** |
| listvars(int on, int off, char ***end) |
| { |
| struct var **vpp; |
| struct var *vp; |
| char **ep; |
| int mask; |
| |
| STARTSTACKSTR(ep); |
| vpp = vartab; |
| mask = on | off; |
| do { |
| for (vp = *vpp; vp; vp = vp->next) { |
| if ((vp->flags & mask) == on) { |
| if (ep == stackstrend()) |
| ep = growstackstr(); |
| *ep++ = (char*)vp->var_text; |
| } |
| } |
| } while (++vpp < vartab + VTABSIZE); |
| if (ep == stackstrend()) |
| ep = growstackstr(); |
| if (end) |
| *end = ep; |
| *ep++ = NULL; |
| return grabstackstr(ep); |
| } |
| |
| |
| /* ============ Path search helper |
| * |
| * The variable path (passed by reference) should be set to the start |
| * of the path before the first call; path_advance will update |
| * this value as it proceeds. Successive calls to path_advance will return |
| * the possible path expansions in sequence. If an option (indicated by |
| * a percent sign) appears in the path entry then the global variable |
| * pathopt will be set to point to it; otherwise pathopt will be set to |
| * NULL. |
| */ |
| static const char *pathopt; /* set by path_advance */ |
| |
| static char * |
| path_advance(const char **path, const char *name) |
| { |
| const char *p; |
| char *q; |
| const char *start; |
| size_t len; |
| |
| if (*path == NULL) |
| return NULL; |
| start = *path; |
| for (p = start; *p && *p != ':' && *p != '%'; p++) |
| continue; |
| len = p - start + strlen(name) + 2; /* "2" is for '/' and '\0' */ |
| while (stackblocksize() < len) |
| growstackblock(); |
| q = stackblock(); |
| if (p != start) { |
| memcpy(q, start, p - start); |
| q += p - start; |
| *q++ = '/'; |
| } |
| strcpy(q, name); |
| pathopt = NULL; |
| if (*p == '%') { |
| pathopt = ++p; |
| while (*p && *p != ':') |
| p++; |
| } |
| if (*p == ':') |
| *path = p + 1; |
| else |
| *path = NULL; |
| return stalloc(len); |
| } |
| |
| |
| /* ============ Prompt */ |
| |
| static smallint doprompt; /* if set, prompt the user */ |
| static smallint needprompt; /* true if interactive and at start of line */ |
| |
| #if ENABLE_FEATURE_EDITING |
| static line_input_t *line_input_state; |
| static const char *cmdedit_prompt; |
| static void |
| putprompt(const char *s) |
| { |
| if (ENABLE_ASH_EXPAND_PRMT) { |
| free((char*)cmdedit_prompt); |
| cmdedit_prompt = ckstrdup(s); |
| return; |
| } |
| cmdedit_prompt = s; |
| } |
| #else |
| static void |
| putprompt(const char *s) |
| { |
| out2str(s); |
| } |
| #endif |
| |
| /* expandstr() needs parsing machinery, so it is far away ahead... */ |
| static const char *expandstr(const char *ps); |
| |
| static void |
| setprompt_if(smallint do_set, int whichprompt) |
| { |
| const char *prompt; |
| IF_ASH_EXPAND_PRMT(struct stackmark smark;) |
| |
| if (!do_set) |
| return; |
| |
| needprompt = 0; |
| |
| switch (whichprompt) { |
| case 1: |
| prompt = ps1val(); |
| break; |
| case 2: |
| prompt = ps2val(); |
| break; |
| default: /* 0 */ |
| prompt = nullstr; |
| } |
| #if ENABLE_ASH_EXPAND_PRMT |
| pushstackmark(&smark, stackblocksize()); |
| #endif |
| putprompt(expandstr(prompt)); |
| #if ENABLE_ASH_EXPAND_PRMT |
| popstackmark(&smark); |
| #endif |
| } |
| |
| |
| /* ============ The cd and pwd commands */ |
| |
| #define CD_PHYSICAL 1 |
| #define CD_PRINT 2 |
| |
| static int |
| cdopt(void) |
| { |
| int flags = 0; |
| int i, j; |
| |
| j = 'L'; |
| while ((i = nextopt("LP")) != '\0') { |
| if (i != j) { |
| flags ^= CD_PHYSICAL; |
| j = i; |
| } |
| } |
| |
| return flags; |
| } |
| |
| /* |
| * Update curdir (the name of the current directory) in response to a |
| * cd command. |
| */ |
| static const char * |
| updatepwd(const char *dir) |
| { |
| char *new; |
| char *p; |
| char *cdcomppath; |
| const char *lim; |
| |
| cdcomppath = sstrdup(dir); |
| STARTSTACKSTR(new); |
| if (*dir != '/') { |
| if (curdir == nullstr) |
| return 0; |
| new = stack_putstr(curdir, new); |
| } |
| new = makestrspace(strlen(dir) + 2, new); |
| lim = (char *)stackblock() + 1; |
| if (*dir != '/') { |
| if (new[-1] != '/') |
| USTPUTC('/', new); |
| if (new > lim && *lim == '/') |
| lim++; |
| } else { |
| USTPUTC('/', new); |
| cdcomppath++; |
| if (dir[1] == '/' && dir[2] != '/') { |
| USTPUTC('/', new); |
| cdcomppath++; |
| lim++; |
| } |
| } |
| p = strtok(cdcomppath, "/"); |
| while (p) { |
| switch (*p) { |
| case '.': |
| if (p[1] == '.' && p[2] == '\0') { |
| while (new > lim) { |
| STUNPUTC(new); |
| if (new[-1] == '/') |
| break; |
| } |
| break; |
| } |
| if (p[1] == '\0') |
| break; |
| /* fall through */ |
| default: |
| new = stack_putstr(p, new); |
| USTPUTC('/', new); |
| } |
| p = strtok(NULL, "/"); |
| } |
| if (new > lim) |
| STUNPUTC(new); |
| *new = 0; |
| return stackblock(); |
| } |
| |
| /* |
| * Find out what the current directory is. If we already know the current |
| * directory, this routine returns immediately. |
| */ |
| static char * |
| getpwd(void) |
| { |
| char *dir = getcwd(NULL, 0); /* huh, using glibc extension? */ |
| return dir ? dir : nullstr; |
| } |
| |
| static void |
| setpwd(const char *val, int setold) |
| { |
| char *oldcur, *dir; |
| |
| oldcur = dir = curdir; |
| |
| if (setold) { |
| setvar("OLDPWD", oldcur, VEXPORT); |
| } |
| INT_OFF; |
| if (physdir != nullstr) { |
| if (physdir != oldcur) |
| free(physdir); |
| physdir = nullstr; |
| } |
| if (oldcur == val || !val) { |
| char *s = getpwd(); |
| physdir = s; |
| if (!val) |
| dir = s; |
| } else |
| dir = ckstrdup(val); |
| if (oldcur != dir && oldcur != nullstr) { |
| free(oldcur); |
| } |
| curdir = dir; |
| INT_ON; |
| setvar("PWD", dir, VEXPORT); |
| } |
| |
| static void hashcd(void); |
| |
| /* |
| * Actually do the chdir. We also call hashcd to let other routines |
| * know that the current directory has changed. |
| */ |
| static int |
| docd(const char *dest, int flags) |
| { |
| const char *dir = NULL; |
| int err; |
| |
| TRACE(("docd(\"%s\", %d) called\n", dest, flags)); |
| |
| INT_OFF; |
| if (!(flags & CD_PHYSICAL)) { |
| dir = updatepwd(dest); |
| if (dir) |
| dest = dir; |
| } |
| err = chdir(dest); |
| if (err) |
| goto out; |
| setpwd(dir, 1); |
| hashcd(); |
| out: |
| INT_ON; |
| return err; |
| } |
| |
| static int FAST_FUNC |
| cdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
| { |
| const char *dest; |
| const char *path; |
| const char *p; |
| char c; |
| struct stat statb; |
| int flags; |
| |
| flags = cdopt(); |
| dest = *argptr; |
| if (!dest) |
| dest = bltinlookup("HOME"); |
| else if (LONE_DASH(dest)) { |
| dest = bltinlookup("OLDPWD"); |
| flags |= CD_PRINT; |
| } |
| if (!dest) |
| dest = nullstr; |
| if (*dest == '/') |
| goto step6; |
| if (*dest == '.') { |
| c = dest[1]; |
| dotdot: |
| switch (c) { |
| case '\0': |
| case '/': |
| goto step6; |
| case '.': |
| c = dest[2]; |
| if (c != '.') |
| goto dotdot; |
| } |
| } |
| if (!*dest) |
| dest = "."; |
| path = bltinlookup("CDPATH"); |
| while (path) { |
| c = *path; |
| p = path_advance(&path, dest); |
| if (stat(p, &statb) >= 0 && S_ISDIR(statb.st_mode)) { |
| if (c && c != ':') |
| flags |= CD_PRINT; |
| docd: |
| if (!docd(p, flags)) |
| goto out; |
| goto err; |
| } |
| } |
| |
| step6: |
| p = dest; |
| goto docd; |
| |
| err: |
| ash_msg_and_raise_error("can't cd to %s", dest); |
| /* NOTREACHED */ |
| out: |
| if (flags & CD_PRINT) |
| out1fmt("%s\n", curdir); |
| return 0; |
| } |
| |
| static int FAST_FUNC |
| pwdcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
| { |
| int flags; |
| const char *dir = curdir; |
| |
| flags = cdopt(); |
| if (flags) { |
| if (physdir == nullstr) |
| setpwd(dir, 0); |
| dir = physdir; |
| } |
| out1fmt("%s\n", dir); |
| return 0; |
| } |
| |
| |
| /* ============ ... */ |
| |
| |
| #define IBUFSIZ (ENABLE_FEATURE_EDITING ? CONFIG_FEATURE_EDITING_MAX_LEN : 1024) |
| |
| /* Syntax classes */ |
| #define CWORD 0 /* character is nothing special */ |
| #define CNL 1 /* newline character */ |
| #define CBACK 2 /* a backslash character */ |
| #define CSQUOTE 3 /* single quote */ |
| #define CDQUOTE 4 /* double quote */ |
| #define CENDQUOTE 5 /* a terminating quote */ |
| #define CBQUOTE 6 /* backwards single quote */ |
| #define CVAR 7 /* a dollar sign */ |
| #define CENDVAR 8 /* a '}' character */ |
| #define CLP 9 /* a left paren in arithmetic */ |
| #define CRP 10 /* a right paren in arithmetic */ |
| #define CENDFILE 11 /* end of file */ |
| #define CCTL 12 /* like CWORD, except it must be escaped */ |
| #define CSPCL 13 /* these terminate a word */ |
| #define CIGN 14 /* character should be ignored */ |
| |
| #define PEOF 256 |
| #if ENABLE_ASH_ALIAS |
| # define PEOA 257 |
| #endif |
| |
| #define USE_SIT_FUNCTION ENABLE_ASH_OPTIMIZE_FOR_SIZE |
| |
| #if ENABLE_FEATURE_SH_MATH |
| # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8) | (d << 12)) |
| #else |
| # define SIT_ITEM(a,b,c,d) (a | (b << 4) | (c << 8)) |
| #endif |
| static const uint16_t S_I_T[] ALIGN2 = { |
| #if ENABLE_ASH_ALIAS |
| SIT_ITEM(CSPCL , CIGN , CIGN , CIGN ), /* 0, PEOA */ |
| #endif |
| SIT_ITEM(CSPCL , CWORD , CWORD, CWORD ), /* 1, ' ' */ |
| SIT_ITEM(CNL , CNL , CNL , CNL ), /* 2, \n */ |
| SIT_ITEM(CWORD , CCTL , CCTL , CWORD ), /* 3, !*-/:=?[]~ */ |
| SIT_ITEM(CDQUOTE , CENDQUOTE, CWORD, CWORD ), /* 4, '"' */ |
| SIT_ITEM(CVAR , CVAR , CWORD, CVAR ), /* 5, $ */ |
| SIT_ITEM(CSQUOTE , CWORD , CENDQUOTE, CWORD), /* 6, "'" */ |
| SIT_ITEM(CSPCL , CWORD , CWORD, CLP ), /* 7, ( */ |
| SIT_ITEM(CSPCL , CWORD , CWORD, CRP ), /* 8, ) */ |
| SIT_ITEM(CBACK , CBACK , CCTL , CBACK ), /* 9, \ */ |
| SIT_ITEM(CBQUOTE , CBQUOTE , CWORD, CBQUOTE), /* 10, ` */ |
| SIT_ITEM(CENDVAR , CENDVAR , CWORD, CENDVAR), /* 11, } */ |
| #if !USE_SIT_FUNCTION |
| SIT_ITEM(CENDFILE, CENDFILE , CENDFILE, CENDFILE),/* 12, PEOF */ |
| SIT_ITEM(CWORD , CWORD , CWORD, CWORD ), /* 13, 0-9A-Za-z */ |
| SIT_ITEM(CCTL , CCTL , CCTL , CCTL ) /* 14, CTLESC ... */ |
| #endif |
| #undef SIT_ITEM |
| }; |
| /* Constants below must match table above */ |
| enum { |
| #if ENABLE_ASH_ALIAS |
| CSPCL_CIGN_CIGN_CIGN , /* 0 */ |
| #endif |
| CSPCL_CWORD_CWORD_CWORD , /* 1 */ |
| CNL_CNL_CNL_CNL , /* 2 */ |
| CWORD_CCTL_CCTL_CWORD , /* 3 */ |
| CDQUOTE_CENDQUOTE_CWORD_CWORD , /* 4 */ |
| CVAR_CVAR_CWORD_CVAR , /* 5 */ |
| CSQUOTE_CWORD_CENDQUOTE_CWORD , /* 6 */ |
| CSPCL_CWORD_CWORD_CLP , /* 7 */ |
| CSPCL_CWORD_CWORD_CRP , /* 8 */ |
| CBACK_CBACK_CCTL_CBACK , /* 9 */ |
| CBQUOTE_CBQUOTE_CWORD_CBQUOTE , /* 10 */ |
| CENDVAR_CENDVAR_CWORD_CENDVAR , /* 11 */ |
| CENDFILE_CENDFILE_CENDFILE_CENDFILE, /* 12 */ |
| CWORD_CWORD_CWORD_CWORD , /* 13 */ |
| CCTL_CCTL_CCTL_CCTL , /* 14 */ |
| }; |
| |
| /* c in SIT(c, syntax) must be an *unsigned char* or PEOA or PEOF, |
| * caller must ensure proper cast on it if c is *char_ptr! |
| */ |
| /* Values for syntax param */ |
| #define BASESYNTAX 0 /* not in quotes */ |
| #define DQSYNTAX 1 /* in double quotes */ |
| #define SQSYNTAX 2 /* in single quotes */ |
| #define ARISYNTAX 3 /* in arithmetic */ |
| #define PSSYNTAX 4 /* prompt. never passed to SIT() */ |
| |
| #if USE_SIT_FUNCTION |
| |
| static int |
| SIT(int c, int syntax) |
| { |
| /* Used to also have '/' in this string: "\t\n !\"$&'()*-/:;<=>?[\\]`|}~" */ |
| static const char spec_symbls[] ALIGN1 = "\t\n !\"$&'()*-:;<=>?[\\]`|}~"; |
| /* |
| * This causes '/' to be prepended with CTLESC in dquoted string, |
| * making "./file"* treated incorrectly because we feed |
| * ".\/file*" string to glob(), confusing it (see expandmeta func). |
| * The "homegrown" glob implementation is okay with that, |
| * but glibc one isn't. With '/' always treated as CWORD, |
| * both work fine. |
| */ |
| # if ENABLE_ASH_ALIAS |
| static const uint8_t syntax_index_table[] ALIGN1 = { |
| 1, 2, 1, 3, 4, 5, 1, 6, /* "\t\n !\"$&'" */ |
| 7, 8, 3, 3,/*3,*/3, 1, 1, /* "()*-/:;<" */ |
| 3, 1, 3, 3, 9, 3, 10, 1, /* "=>?[\\]`|" */ |
| 11, 3 /* "}~" */ |
| }; |
| # else |
| static const uint8_t syntax_index_table[] ALIGN1 = { |
| 0, 1, 0, 2, 3, 4, 0, 5, /* "\t\n !\"$&'" */ |
| 6, 7, 2, 2,/*2,*/2, 0, 0, /* "()*-/:;<" */ |
| 2, 0, 2, 2, 8, 2, 9, 0, /* "=>?[\\]`|" */ |
| 10, 2 /* "}~" */ |
| }; |
| # endif |
| const char *s; |
| int indx; |
| |
| if (c == PEOF) |
| return CENDFILE; |
| # if ENABLE_ASH_ALIAS |
| if (c == PEOA) |
| indx = 0; |
| else |
| # endif |
| { |
| /* Cast is purely for paranoia here, |
| * just in case someone passed signed char to us */ |
| if ((unsigned char)c >= CTL_FIRST |
| && (unsigned char)c <= CTL_LAST |
| ) { |
| return CCTL; |
| } |
| s = strchrnul(spec_symbls, c); |
| if (*s == '\0') |
| return CWORD; |
| indx = syntax_index_table[s - spec_symbls]; |
| } |
| return (S_I_T[indx] >> (syntax*4)) & 0xf; |
| } |
| |
| #else /* !USE_SIT_FUNCTION */ |
| |
| static const uint8_t syntax_index_table[] ALIGN1 = { |
| /* BASESYNTAX_DQSYNTAX_SQSYNTAX_ARISYNTAX */ |
| /* 0 */ CWORD_CWORD_CWORD_CWORD, |
| /* 1 */ CWORD_CWORD_CWORD_CWORD, |
| /* 2 */ CWORD_CWORD_CWORD_CWORD, |
| /* 3 */ CWORD_CWORD_CWORD_CWORD, |
| /* 4 */ CWORD_CWORD_CWORD_CWORD, |
| /* 5 */ CWORD_CWORD_CWORD_CWORD, |
| /* 6 */ CWORD_CWORD_CWORD_CWORD, |
| /* 7 */ CWORD_CWORD_CWORD_CWORD, |
| /* 8 */ CWORD_CWORD_CWORD_CWORD, |
| /* 9 "\t" */ CSPCL_CWORD_CWORD_CWORD, |
| /* 10 "\n" */ CNL_CNL_CNL_CNL, |
| /* 11 */ CWORD_CWORD_CWORD_CWORD, |
| /* 12 */ CWORD_CWORD_CWORD_CWORD, |
| /* 13 */ CWORD_CWORD_CWORD_CWORD, |
| /* 14 */ CWORD_CWORD_CWORD_CWORD, |
| /* 15 */ CWORD_CWORD_CWORD_CWORD, |
| /* 16 */ CWORD_CWORD_CWORD_CWORD, |
| /* 17 */ CWORD_CWORD_CWORD_CWORD, |
| /* 18 */ CWORD_CWORD_CWORD_CWORD, |
| /* 19 */ CWORD_CWORD_CWORD_CWORD, |
| /* 20 */ CWORD_CWORD_CWORD_CWORD, |
| /* 21 */ CWORD_CWORD_CWORD_CWORD, |
| /* 22 */ CWORD_CWORD_CWORD_CWORD, |
| /* 23 */ CWORD_CWORD_CWORD_CWORD, |
| /* 24 */ CWORD_CWORD_CWORD_CWORD, |
| /* 25 */ CWORD_CWORD_CWORD_CWORD, |
| /* 26 */ CWORD_CWORD_CWORD_CWORD, |
| /* 27 */ CWORD_CWORD_CWORD_CWORD, |
| /* 28 */ CWORD_CWORD_CWORD_CWORD, |
| /* 29 */ CWORD_CWORD_CWORD_CWORD, |
| /* 30 */ CWORD_CWORD_CWORD_CWORD, |
| /* 31 */ CWORD_CWORD_CWORD_CWORD, |
| /* 32 " " */ CSPCL_CWORD_CWORD_CWORD, |
| /* 33 "!" */ CWORD_CCTL_CCTL_CWORD, |
| /* 34 """ */ CDQUOTE_CENDQUOTE_CWORD_CWORD, |
| /* 35 "#" */ CWORD_CWORD_CWORD_CWORD, |
| /* 36 "$" */ CVAR_CVAR_CWORD_CVAR, |
| /* 37 "%" */ CWORD_CWORD_CWORD_CWORD, |
| /* 38 "&" */ CSPCL_CWORD_CWORD_CWORD, |
| /* 39 "'" */ CSQUOTE_CWORD_CENDQUOTE_CWORD, |
| /* 40 "(" */ CSPCL_CWORD_CWORD_CLP, |
| /* 41 ")" */ CSPCL_CWORD_CWORD_CRP, |
| /* 42 "*" */ CWORD_CCTL_CCTL_CWORD, |
| /* 43 "+" */ CWORD_CWORD_CWORD_CWORD, |
| /* 44 "," */ CWORD_CWORD_CWORD_CWORD, |
| /* 45 "-" */ CWORD_CCTL_CCTL_CWORD, |
| /* 46 "." */ CWORD_CWORD_CWORD_CWORD, |
| /* "/" was CWORD_CCTL_CCTL_CWORD, see comment in SIT() function why this is changed: */ |
| /* 47 "/" */ CWORD_CWORD_CWORD_CWORD, |
| /* 48 "0" */ CWORD_CWORD_CWORD_CWORD, |
| /* 49 "1" */ CWORD_CWORD_CWORD_CWORD, |
| /* 50 "2" */ CWORD_CWORD_CWORD_CWORD, |
| /* 51 "3" */ CWORD_CWORD_CWORD_CWORD, |
| /* 52 "4" */ CWORD_CWORD_CWORD_CWORD, |
| /* 53 "5" */ CWORD_CWORD_CWORD_CWORD, |
| /* 54 "6" */ CWORD_CWORD_CWORD_CWORD, |
| /* 55 "7" */ CWORD_CWORD_CWORD_CWORD, |
| /* 56 "8" */ CWORD_CWORD_CWORD_CWORD, |
| /* 57 "9" */ CWORD_CWORD_CWORD_CWORD, |
| /* 58 ":" */ CWORD_CCTL_CCTL_CWORD, |
| /* 59 ";" */ CSPCL_CWORD_CWORD_CWORD, |
| /* 60 "<" */ CSPCL_CWORD_CWORD_CWORD, |
| /* 61 "=" */ CWORD_CCTL_CCTL_CWORD, |
| /* 62 ">" */ CSPCL_CWORD_CWORD_CWORD, |
| /* 63 "?" */ CWORD_CCTL_CCTL_CWORD, |
| /* 64 "@" */ CWORD_CWORD_CWORD_CWORD, |
| /* 65 "A" */ CWORD_CWORD_CWORD_CWORD, |
| /* 66 "B" */ CWORD_CWORD_CWORD_CWORD, |
| /* 67 "C" */ CWORD_CWORD_CWORD_CWORD, |
| /* 68 "D" */ CWORD_CWORD_CWORD_CWORD, |
| /* 69 "E" */ CWORD_CWORD_CWORD_CWORD, |
| /* 70 "F" */ CWORD_CWORD_CWORD_CWORD, |
| /* 71 "G" */ CWORD_CWORD_CWORD_CWORD, |
| /* 72 "H" */ CWORD_CWORD_CWORD_CWORD, |
| /* 73 "I" */ CWORD_CWORD_CWORD_CWORD, |
| /* 74 "J" */ CWORD_CWORD_CWORD_CWORD, |
| /* 75 "K" */ CWORD_CWORD_CWORD_CWORD, |
| /* 76 "L" */ CWORD_CWORD_CWORD_CWORD, |
| /* 77 "M" */ CWORD_CWORD_CWORD_CWORD, |
| /* 78 "N" */ CWORD_CWORD_CWORD_CWORD, |
| /* 79 "O" */ CWORD_CWORD_CWORD_CWORD, |
| /* 80 "P" */ CWORD_CWORD_CWORD_CWORD, |
| /* 81 "Q" */ CWORD_CWORD_CWORD_CWORD, |
| /* 82 "R" */ CWORD_CWORD_CWORD_CWORD, |
| /* 83 "S" */ CWORD_CWORD_CWORD_CWORD, |
| /* 84 "T" */ CWORD_CWORD_CWORD_CWORD, |
| /* 85 "U" */ CWORD_CWORD_CWORD_CWORD, |
| /* 86 "V" */ CWORD_CWORD_CWORD_CWORD, |
| /* 87 "W" */ CWORD_CWORD_CWORD_CWORD, |
| /* 88 "X" */ CWORD_CWORD_CWORD_CWORD, |
| /* 89 "Y" */ CWORD_CWORD_CWORD_CWORD, |
| /* 90 "Z" */ CWORD_CWORD_CWORD_CWORD, |
| /* 91 "[" */ CWORD_CCTL_CCTL_CWORD, |
| /* 92 "\" */ CBACK_CBACK_CCTL_CBACK, |
| /* 93 "]" */ CWORD_CCTL_CCTL_CWORD, |
| /* 94 "^" */ CWORD_CWORD_CWORD_CWORD, |
| /* 95 "_" */ CWORD_CWORD_CWORD_CWORD, |
| /* 96 "`" */ CBQUOTE_CBQUOTE_CWORD_CBQUOTE, |
| /* 97 "a" */ CWORD_CWORD_CWORD_CWORD, |
| /* 98 "b" */ CWORD_CWORD_CWORD_CWORD, |
| /* 99 "c" */ CWORD_CWORD_CWORD_CWORD, |
| /* 100 "d" */ CWORD_CWORD_CWORD_CWORD, |
| /* 101 "e" */ CWORD_CWORD_CWORD_CWORD, |
| /* 102 "f" */ CWORD_CWORD_CWORD_CWORD, |
| /* 103 "g" */ CWORD_CWORD_CWORD_CWORD, |
| /* 104 "h" */ CWORD_CWORD_CWORD_CWORD, |
| /* 105 "i" */ CWORD_CWORD_CWORD_CWORD, |
| /* 106 "j" */ CWORD_CWORD_CWORD_CWORD, |
| /* 107 "k" */ CWORD_CWORD_CWORD_CWORD, |
| /* 108 "l" */ CWORD_CWORD_CWORD_CWORD, |
| /* 109 "m" */ CWORD_CWORD_CWORD_CWORD, |
| /* 110 "n" */ CWORD_CWORD_CWORD_CWORD, |
| /* 111 "o" */ CWORD_CWORD_CWORD_CWORD, |
| /* 112 "p" */ CWORD_CWORD_CWORD_CWORD, |
| /* 113 "q" */ CWORD_CWORD_CWORD_CWORD, |
| /* 114 "r" */ CWORD_CWORD_CWORD_CWORD, |
| /* 115 "s" */ CWORD_CWORD_CWORD_CWORD, |
| /* 116 "t" */ CWORD_CWORD_CWORD_CWORD, |
| /* 117 "u" */ CWORD_CWORD_CWORD_CWORD, |
| /* 118 "v" */ CWORD_CWORD_CWORD_CWORD, |
| /* 119 "w" */ CWORD_CWORD_CWORD_CWORD, |
| /* 120 "x" */ CWORD_CWORD_CWORD_CWORD, |
| /* 121 "y" */ CWORD_CWORD_CWORD_CWORD, |
| /* 122 "z" */ CWORD_CWORD_CWORD_CWORD, |
| /* 123 "{" */ CWORD_CWORD_CWORD_CWORD, |
| /* 124 "|" */ CSPCL_CWORD_CWORD_CWORD, |
| /* 125 "}" */ CENDVAR_CENDVAR_CWORD_CENDVAR, |
| /* 126 "~" */ CWORD_CCTL_CCTL_CWORD, |
| /* 127 del */ CWORD_CWORD_CWORD_CWORD, |
| /* 128 0x80 */ CWORD_CWORD_CWORD_CWORD, |
| /* 129 CTLESC */ CCTL_CCTL_CCTL_CCTL, |
| /* 130 CTLVAR */ CCTL_CCTL_CCTL_CCTL, |
| /* 131 CTLENDVAR */ CCTL_CCTL_CCTL_CCTL, |
| /* 132 CTLBACKQ */ CCTL_CCTL_CCTL_CCTL, |
| /* 133 CTLQUOTE */ CCTL_CCTL_CCTL_CCTL, |
| /* 134 CTLARI */ CCTL_CCTL_CCTL_CCTL, |
| /* 135 CTLENDARI */ CCTL_CCTL_CCTL_CCTL, |
| /* 136 CTLQUOTEMARK */ CCTL_CCTL_CCTL_CCTL, |
| /* 137 */ CWORD_CWORD_CWORD_CWORD, |
| /* 138 */ CWORD_CWORD_CWORD_CWORD, |
| /* 139 */ CWORD_CWORD_CWORD_CWORD, |
| /* 140 */ CWORD_CWORD_CWORD_CWORD, |
| /* 141 */ CWORD_CWORD_CWORD_CWORD, |
| /* 142 */ CWORD_CWORD_CWORD_CWORD, |
| /* 143 */ CWORD_CWORD_CWORD_CWORD, |
| /* 144 */ CWORD_CWORD_CWORD_CWORD, |
| /* 145 */ CWORD_CWORD_CWORD_CWORD, |
| /* 146 */ CWORD_CWORD_CWORD_CWORD, |
| /* 147 */ CWORD_CWORD_CWORD_CWORD, |
| /* 148 */ CWORD_CWORD_CWORD_CWORD, |
| /* 149 */ CWORD_CWORD_CWORD_CWORD, |
| /* 150 */ CWORD_CWORD_CWORD_CWORD, |
| /* 151 */ CWORD_CWORD_CWORD_CWORD, |
| /* 152 */ CWORD_CWORD_CWORD_CWORD, |
| /* 153 */ CWORD_CWORD_CWORD_CWORD, |
| /* 154 */ CWORD_CWORD_CWORD_CWORD, |
| /* 155 */ CWORD_CWORD_CWORD_CWORD, |
| /* 156 */ CWORD_CWORD_CWORD_CWORD, |
| /* 157 */ CWORD_CWORD_CWORD_CWORD, |
| /* 158 */ CWORD_CWORD_CWORD_CWORD, |
| /* 159 */ CWORD_CWORD_CWORD_CWORD, |
| /* 160 */ CWORD_CWORD_CWORD_CWORD, |
| /* 161 */ CWORD_CWORD_CWORD_CWORD, |
| /* 162 */ CWORD_CWORD_CWORD_CWORD, |
| /* 163 */ CWORD_CWORD_CWORD_CWORD, |
| /* 164 */ CWORD_CWORD_CWORD_CWORD, |
| /* 165 */ CWORD_CWORD_CWORD_CWORD, |
| /* 166 */ CWORD_CWORD_CWORD_CWORD, |
| /* 167 */ CWORD_CWORD_CWORD_CWORD, |
| /* 168 */ CWORD_CWORD_CWORD_CWORD, |
| /* 169 */ CWORD_CWORD_CWORD_CWORD, |
| /* 170 */ CWORD_CWORD_CWORD_CWORD, |
| /* 171 */ CWORD_CWORD_CWORD_CWORD, |
| /* 172 */ CWORD_CWORD_CWORD_CWORD, |
| /* 173 */ CWORD_CWORD_CWORD_CWORD, |
| /* 174 */ CWORD_CWORD_CWORD_CWORD, |
| /* 175 */ CWORD_CWORD_CWORD_CWORD, |
| /* 176 */ CWORD_CWORD_CWORD_CWORD, |
| /* 177 */ CWORD_CWORD_CWORD_CWORD, |
| /* 178 */ CWORD_CWORD_CWORD_CWORD, |
| /* 179 */ CWORD_CWORD_CWORD_CWORD, |
| /* 180 */ CWORD_CWORD_CWORD_CWORD, |
| /* 181 */ CWORD_CWORD_CWORD_CWORD, |
| /* 182 */ CWORD_CWORD_CWORD_CWORD, |
| /* 183 */ CWORD_CWORD_CWORD_CWORD, |
| /* 184 */ CWORD_CWORD_CWORD_CWORD, |
| /* 185 */ CWORD_CWORD_CWORD_CWORD, |
| /* 186 */ CWORD_CWORD_CWORD_CWORD, |
| /* 187 */ CWORD_CWORD_CWORD_CWORD, |
| /* 188 */ CWORD_CWORD_CWORD_CWORD, |
| /* 189 */ CWORD_CWORD_CWORD_CWORD, |
| /* 190 */ CWORD_CWORD_CWORD_CWORD, |
| /* 191 */ CWORD_CWORD_CWORD_CWORD, |
| /* 192 */ CWORD_CWORD_CWORD_CWORD, |
| /* 193 */ CWORD_CWORD_CWORD_CWORD, |
| /* 194 */ CWORD_CWORD_CWORD_CWORD, |
| /* 195 */ CWORD_CWORD_CWORD_CWORD, |
| /* 196 */ CWORD_CWORD_CWORD_CWORD, |
| /* 197 */ CWORD_CWORD_CWORD_CWORD, |
| /* 198 */ CWORD_CWORD_CWORD_CWORD, |
| /* 199 */ CWORD_CWORD_CWORD_CWORD, |
| /* 200 */ CWORD_CWORD_CWORD_CWORD, |
| /* 201 */ CWORD_CWORD_CWORD_CWORD, |
| /* 202 */ CWORD_CWORD_CWORD_CWORD, |
| /* 203 */ CWORD_CWORD_CWORD_CWORD, |
| /* 204 */ CWORD_CWORD_CWORD_CWORD, |
| /* 205 */ CWORD_CWORD_CWORD_CWORD, |
| /* 206 */ CWORD_CWORD_CWORD_CWORD, |
| /* 207 */ CWORD_CWORD_CWORD_CWORD, |
| /* 208 */ CWORD_CWORD_CWORD_CWORD, |
| /* 209 */ CWORD_CWORD_CWORD_CWORD, |
| /* 210 */ CWORD_CWORD_CWORD_CWORD, |
| /* 211 */ CWORD_CWORD_CWORD_CWORD, |
| /* 212 */ CWORD_CWORD_CWORD_CWORD, |
| /* 213 */ CWORD_CWORD_CWORD_CWORD, |
| /* 214 */ CWORD_CWORD_CWORD_CWORD, |
| /* 215 */ CWORD_CWORD_CWORD_CWORD, |
| /* 216 */ CWORD_CWORD_CWORD_CWORD, |
| /* 217 */ CWORD_CWORD_CWORD_CWORD, |
| /* 218 */ CWORD_CWORD_CWORD_CWORD, |
| /* 219 */ CWORD_CWORD_CWORD_CWORD, |
| /* 220 */ CWORD_CWORD_CWORD_CWORD, |
| /* 221 */ CWORD_CWORD_CWORD_CWORD, |
| /* 222 */ CWORD_CWORD_CWORD_CWORD, |
| /* 223 */ CWORD_CWORD_CWORD_CWORD, |
| /* 224 */ CWORD_CWORD_CWORD_CWORD, |
| /* 225 */ CWORD_CWORD_CWORD_CWORD, |
| /* 226 */ CWORD_CWORD_CWORD_CWORD, |
| /* 227 */ CWORD_CWORD_CWORD_CWORD, |
| /* 228 */ CWORD_CWORD_CWORD_CWORD, |
| /* 229 */ CWORD_CWORD_CWORD_CWORD, |
| /* 230 */ CWORD_CWORD_CWORD_CWORD, |
| /* 231 */ CWORD_CWORD_CWORD_CWORD, |
| /* 232 */ CWORD_CWORD_CWORD_CWORD, |
| /* 233 */ CWORD_CWORD_CWORD_CWORD, |
| /* 234 */ CWORD_CWORD_CWORD_CWORD, |
| /* 235 */ CWORD_CWORD_CWORD_CWORD, |
| /* 236 */ CWORD_CWORD_CWORD_CWORD, |
| /* 237 */ CWORD_CWORD_CWORD_CWORD, |
| /* 238 */ CWORD_CWORD_CWORD_CWORD, |
| /* 239 */ CWORD_CWORD_CWORD_CWORD, |
| /* 230 */ CWORD_CWORD_CWORD_CWORD, |
| /* 241 */ CWORD_CWORD_CWORD_CWORD, |
| /* 242 */ CWORD_CWORD_CWORD_CWORD, |
| /* 243 */ CWORD_CWORD_CWORD_CWORD, |
| /* 244 */ CWORD_CWORD_CWORD_CWORD, |
| /* 245 */ CWORD_CWORD_CWORD_CWORD, |
| /* 246 */ CWORD_CWORD_CWORD_CWORD, |
| /* 247 */ CWORD_CWORD_CWORD_CWORD, |
| /* 248 */ CWORD_CWORD_CWORD_CWORD, |
| /* 249 */ CWORD_CWORD_CWORD_CWORD, |
| /* 250 */ CWORD_CWORD_CWORD_CWORD, |
| /* 251 */ CWORD_CWORD_CWORD_CWORD, |
| /* 252 */ CWORD_CWORD_CWORD_CWORD, |
| /* 253 */ CWORD_CWORD_CWORD_CWORD, |
| /* 254 */ CWORD_CWORD_CWORD_CWORD, |
| /* 255 */ CWORD_CWORD_CWORD_CWORD, |
| /* PEOF */ CENDFILE_CENDFILE_CENDFILE_CENDFILE, |
| # if ENABLE_ASH_ALIAS |
| /* PEOA */ CSPCL_CIGN_CIGN_CIGN, |
| # endif |
| }; |
| |
| #if 1 |
| # define SIT(c, syntax) ((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf) |
| #else /* debug version, caught one signed char bug */ |
| # define SIT(c, syntax) \ |
| ({ \ |
| if ((c) < 0 || (c) > (PEOF + ENABLE_ASH_ALIAS)) \ |
| bb_error_msg_and_die("line:%d c:%d", __LINE__, (c)); \ |
| if ((syntax) < 0 || (syntax) > (2 + ENABLE_FEATURE_SH_MATH)) \ |
| bb_error_msg_and_die("line:%d c:%d", __LINE__, (c)); \ |
| ((S_I_T[syntax_index_table[c]] >> ((syntax)*4)) & 0xf); \ |
| }) |
| #endif |
| |
| #endif /* !USE_SIT_FUNCTION */ |
| |
| |
| /* ============ Alias handling */ |
| |
| #if ENABLE_ASH_ALIAS |
| |
| #define ALIASINUSE 1 |
| #define ALIASDEAD 2 |
| |
| struct alias { |
| struct alias *next; |
| char *name; |
| char *val; |
| int flag; |
| }; |
| |
| |
| static struct alias **atab; // [ATABSIZE]; |
| #define INIT_G_alias() do { \ |
| atab = xzalloc(ATABSIZE * sizeof(atab[0])); \ |
| } while (0) |
| |
| |
| static struct alias ** |
| __lookupalias(const char *name) |
| { |
| unsigned int hashval; |
| struct alias **app; |
| const char *p; |
| unsigned int ch; |
| |
| p = name; |
| |
| ch = (unsigned char)*p; |
| hashval = ch << 4; |
| while (ch) { |
| hashval += ch; |
| ch = (unsigned char)*++p; |
| } |
| app = &atab[hashval % ATABSIZE]; |
| |
| for (; *app; app = &(*app)->next) { |
| if (strcmp(name, (*app)->name) == 0) { |
| break; |
| } |
| } |
| |
| return app; |
| } |
| |
| static struct alias * |
| lookupalias(const char *name, int check) |
| { |
| struct alias *ap = *__lookupalias(name); |
| |
| if (check && ap && (ap->flag & ALIASINUSE)) |
| return NULL; |
| return ap; |
| } |
| |
| static struct alias * |
| freealias(struct alias *ap) |
| { |
| struct alias *next; |
| |
| if (ap->flag & ALIASINUSE) { |
| ap->flag |= ALIASDEAD; |
| return ap; |
| } |
| |
| next = ap->next; |
| free(ap->name); |
| free(ap->val); |
| free(ap); |
| return next; |
| } |
| |
| static void |
| setalias(const char *name, const char *val) |
| { |
| struct alias *ap, **app; |
| |
| app = __lookupalias(name); |
| ap = *app; |
| INT_OFF; |
| if (ap) { |
| if (!(ap->flag & ALIASINUSE)) { |
| free(ap->val); |
| } |
| ap->val = ckstrdup(val); |
| ap->flag &= ~ALIASDEAD; |
| } else { |
| /* not found */ |
| ap = ckzalloc(sizeof(struct alias)); |
| ap->name = ckstrdup(name); |
| ap->val = ckstrdup(val); |
| /*ap->flag = 0; - ckzalloc did it */ |
| /*ap->next = NULL;*/ |
| *app = ap; |
| } |
| INT_ON; |
| } |
| |
| static int |
| unalias(const char *name) |
| { |
| struct alias **app; |
| |
| app = __lookupalias(name); |
| |
| if (*app) { |
| INT_OFF; |
| *app = freealias(*app); |
| INT_ON; |
| return 0; |
| } |
| |
| return 1; |
| } |
| |
| static void |
| rmaliases(void) |
| { |
| struct alias *ap, **app; |
| int i; |
| |
| INT_OFF; |
| for (i = 0; i < ATABSIZE; i++) { |
| app = &atab[i]; |
| for (ap = *app; ap; ap = *app) { |
| *app = freealias(*app); |
| if (ap == *app) { |
| app = &ap->next; |
| } |
| } |
| } |
| INT_ON; |
| } |
| |
| static void |
| printalias(const struct alias *ap) |
| { |
| out1fmt("%s=%s\n", ap->name, single_quote(ap->val)); |
| } |
| |
| /* |
| * TODO - sort output |
| */ |
| static int FAST_FUNC |
| aliascmd(int argc UNUSED_PARAM, char **argv) |
| { |
| char *n, *v; |
| int ret = 0; |
| struct alias *ap; |
| |
| if (!argv[1]) { |
| int i; |
| |
| for (i = 0; i < ATABSIZE; i++) { |
| for (ap = atab[i]; ap; ap = ap->next) { |
| printalias(ap); |
| } |
| } |
| return 0; |
| } |
| while ((n = *++argv) != NULL) { |
| v = strchr(n+1, '='); |
| if (v == NULL) { /* n+1: funny ksh stuff */ |
| ap = *__lookupalias(n); |
| if (ap == NULL) { |
| fprintf(stderr, "%s: %s not found\n", "alias", n); |
| ret = 1; |
| } else |
| printalias(ap); |
| } else { |
| *v++ = '\0'; |
| setalias(n, v); |
| } |
| } |
| |
| return ret; |
| } |
| |
| static int FAST_FUNC |
| unaliascmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
| { |
| int i; |
| |
| while (nextopt("a") != '\0') { |
| rmaliases(); |
| return 0; |
| } |
| for (i = 0; *argptr; argptr++) { |
| if (unalias(*argptr)) { |
| fprintf(stderr, "%s: %s not found\n", "unalias", *argptr); |
| i = 1; |
| } |
| } |
| |
| return i; |
| } |
| |
| #endif /* ASH_ALIAS */ |
| |
| |
| /* Mode argument to forkshell. Don't change FORK_FG or FORK_BG. */ |
| #define FORK_FG 0 |
| #define FORK_BG 1 |
| #define FORK_NOJOB 2 |
| |
| /* mode flags for showjob(s) */ |
| #define SHOW_ONLY_PGID 0x01 /* show only pgid (jobs -p) */ |
| #define SHOW_PIDS 0x02 /* show individual pids, not just one line per job */ |
| #define SHOW_CHANGED 0x04 /* only jobs whose state has changed */ |
| #define SHOW_STDERR 0x08 /* print to stderr (else stdout) */ |
| |
| /* |
| * A job structure contains information about a job. A job is either a |
| * single process or a set of processes contained in a pipeline. In the |
| * latter case, pidlist will be non-NULL, and will point to a -1 terminated |
| * array of pids. |
| */ |
| struct procstat { |
| pid_t ps_pid; /* process id */ |
| int ps_status; /* last process status from wait() */ |
| char *ps_cmd; /* text of command being run */ |
| }; |
| |
| struct job { |
| struct procstat ps0; /* status of process */ |
| struct procstat *ps; /* status or processes when more than one */ |
| #if JOBS |
| int stopstatus; /* status of a stopped job */ |
| #endif |
| unsigned nprocs; /* number of processes */ |
| |
| #define JOBRUNNING 0 /* at least one proc running */ |
| #define JOBSTOPPED 1 /* all procs are stopped */ |
| #define JOBDONE 2 /* all procs are completed */ |
| unsigned |
| state: 8, |
| #if JOBS |
| sigint: 1, /* job was killed by SIGINT */ |
| jobctl: 1, /* job running under job control */ |
| #endif |
| waited: 1, /* true if this entry has been waited for */ |
| used: 1, /* true if this entry is in used */ |
| changed: 1; /* true if status has changed */ |
| struct job *prev_job; /* previous job */ |
| }; |
| |
| static struct job *makejob(/*union node *,*/ int); |
| static int forkshell(struct job *, union node *, int); |
| static int waitforjob(struct job *); |
| |
| #if !JOBS |
| enum { doing_jobctl = 0 }; |
| #define setjobctl(on) do {} while (0) |
| #else |
| static smallint doing_jobctl; //references:8 |
| static void setjobctl(int); |
| #endif |
| |
| /* |
| * Ignore a signal. |
| */ |
| static void |
| ignoresig(int signo) |
| { |
| /* Avoid unnecessary system calls. Is it already SIG_IGNed? */ |
| if (sigmode[signo - 1] != S_IGN && sigmode[signo - 1] != S_HARD_IGN) { |
| /* No, need to do it */ |
| signal(signo, SIG_IGN); |
| } |
| sigmode[signo - 1] = S_HARD_IGN; |
| } |
| |
| /* |
| * Only one usage site - in setsignal() |
| */ |
| static void |
| signal_handler(int signo) |
| { |
| if (signo == SIGCHLD) { |
| got_sigchld = 1; |
| if (!trap[SIGCHLD]) |
| return; |
| } |
| |
| gotsig[signo - 1] = 1; |
| pending_sig = signo; |
| |
| if (signo == SIGINT && !trap[SIGINT]) { |
| if (!suppress_int) { |
| pending_sig = 0; |
| raise_interrupt(); /* does not return */ |
| } |
| pending_int = 1; |
| } |
| } |
| |
| /* |
| * Set the signal handler for the specified signal. The routine figures |
| * out what it should be set to. |
| */ |
| static void |
| setsignal(int signo) |
| { |
| char *t; |
| char cur_act, new_act; |
| struct sigaction act; |
| |
| t = trap[signo]; |
| new_act = S_DFL; |
| if (t != NULL) { /* trap for this sig is set */ |
| new_act = S_CATCH; |
| if (t[0] == '\0') /* trap is "": ignore this sig */ |
| new_act = S_IGN; |
| } |
| |
| if (rootshell && new_act == S_DFL) { |
| switch (signo) { |
| case SIGINT: |
| if (iflag || minusc || sflag == 0) |
| new_act = S_CATCH; |
| break; |
| case SIGQUIT: |
| #if DEBUG |
| if (debug) |
| break; |
| #endif |
| /* man bash: |
| * "In all cases, bash ignores SIGQUIT. Non-builtin |
| * commands run by bash have signal handlers |
| * set to the values inherited by the shell |
| * from its parent". */ |
| new_act = S_IGN; |
| break; |
| case SIGTERM: |
| if (iflag) |
| new_act = S_IGN; |
| break; |
| #if JOBS |
| case SIGTSTP: |
| case SIGTTOU: |
| if (mflag) |
| new_act = S_IGN; |
| break; |
| #endif |
| } |
| } |
| //TODO: if !rootshell, we reset SIGQUIT to DFL, |
| //whereas we have to restore it to what shell got on entry |
| //from the parent. See comment above |
| |
| if (signo == SIGCHLD) |
| new_act = S_CATCH; |
| |
| t = &sigmode[signo - 1]; |
| cur_act = *t; |
| if (cur_act == 0) { |
| /* current setting is not yet known */ |
| if (sigaction(signo, NULL, &act)) { |
| /* pretend it worked; maybe we should give a warning, |
| * but other shells don't. We don't alter sigmode, |
| * so we retry every time. |
| * btw, in Linux it never fails. --vda */ |
| return; |
| } |
| if (act.sa_handler == SIG_IGN) { |
| cur_act = S_HARD_IGN; |
| if (mflag |
| && (signo == SIGTSTP || signo == SIGTTIN || signo == SIGTTOU) |
| ) { |
| cur_act = S_IGN; /* don't hard ignore these */ |
| } |
| } |
| } |
| if (cur_act == S_HARD_IGN || cur_act == new_act) |
| return; |
| |
| act.sa_handler = SIG_DFL; |
| switch (new_act) { |
| case S_CATCH: |
| act.sa_handler = signal_handler; |
| break; |
| case S_IGN: |
| act.sa_handler = SIG_IGN; |
| break; |
| } |
| |
| /* flags and mask matter only if !DFL and !IGN, but we do it |
| * for all cases for more deterministic behavior: |
| */ |
| act.sa_flags = 0; |
| sigfillset(&act.sa_mask); |
| |
| sigaction_set(signo, &act); |
| |
| *t = new_act; |
| } |
| |
| /* mode flags for set_curjob */ |
| #define CUR_DELETE 2 |
| #define CUR_RUNNING 1 |
| #define CUR_STOPPED 0 |
| |
| #if JOBS |
| /* pgrp of shell on invocation */ |
| static int initialpgrp; //references:2 |
| static int ttyfd = -1; //5 |
| #endif |
| /* array of jobs */ |
| static struct job *jobtab; //5 |
| /* size of array */ |
| static unsigned njobs; //4 |
| /* current job */ |
| static struct job *curjob; //lots |
| /* number of presumed living untracked jobs */ |
| static int jobless; //4 |
| |
| #if 0 |
| /* Bash has a feature: it restores termios after a successful wait for |
| * a foreground job which had at least one stopped or sigkilled member. |
| * The probable rationale is that SIGSTOP and SIGKILL can preclude task from |
| * properly restoring tty state. Should we do this too? |
| * A reproducer: ^Z an interactive python: |
| * |
| * # python |
| * Python 2.7.12 (...) |
| * >>> ^Z |
| * { python leaves tty in -icanon -echo state. We do survive that... } |
| * [1]+ Stopped python |
| * { ...however, next program (python #2) does not survive it well: } |
| * # python |
| * Python 2.7.12 (...) |
| * >>> Traceback (most recent call last): |
| * { above, I typed "qwerty<CR>", but -echo state is still in effect } |
| * File "<stdin>", line 1, in <module> |
| * NameError: name 'qwerty' is not defined |
| * |
| * The implementation below is modeled on bash code and seems to work. |
| * However, I'm not sure we should do this. For one: what if I'd fg |
| * the stopped python instead? It'll be confused by "restored" tty state. |
| */ |
| static struct termios shell_tty_info; |
| static void |
| get_tty_state(void) |
| { |
| if (rootshell && ttyfd >= 0) |
| tcgetattr(ttyfd, &shell_tty_info); |
| } |
| static void |
| set_tty_state(void) |
| { |
| /* if (rootshell) - caller ensures this */ |
| if (ttyfd >= 0) |
| tcsetattr(ttyfd, TCSADRAIN, &shell_tty_info); |
| } |
| static int |
| job_signal_status(struct job *jp) |
| { |
| int status; |
| unsigned i; |
| struct procstat *ps = jp->ps; |
| for (i = 0; i < jp->nprocs; i++) { |
| status = ps[i].ps_status; |
| if (WIFSIGNALED(status) || WIFSTOPPED(status)) |
| return status; |
| } |
| return 0; |
| } |
| static void |
| restore_tty_if_stopped_or_signaled(struct job *jp) |
| { |
| //TODO: check what happens if we come from waitforjob() in expbackq() |
| if (rootshell) { |
| int s = job_signal_status(jp); |
| if (s) /* WIFSIGNALED(s) || WIFSTOPPED(s) */ |
| set_tty_state(); |
| } |
| } |
| #else |
| # define get_tty_state() ((void)0) |
| # define restore_tty_if_stopped_or_signaled(jp) ((void)0) |
| #endif |
| |
| static void |
| set_curjob(struct job *jp, unsigned mode) |
| { |
| struct job *jp1; |
| struct job **jpp, **curp; |
| |
| /* first remove from list */ |
| jpp = curp = &curjob; |
| while (1) { |
| jp1 = *jpp; |
| if (jp1 == jp) |
| break; |
| jpp = &jp1->prev_job; |
| } |
| *jpp = jp1->prev_job; |
| |
| /* Then re-insert in correct position */ |
| jpp = curp; |
| switch (mode) { |
| default: |
| #if DEBUG |
| abort(); |
| #endif |
| case CUR_DELETE: |
| /* job being deleted */ |
| break; |
| case CUR_RUNNING: |
| /* newly created job or backgrounded job, |
| * put after all stopped jobs. |
| */ |
| while (1) { |
| jp1 = *jpp; |
| #if JOBS |
| if (!jp1 || jp1->state != JOBSTOPPED) |
| #endif |
| break; |
| jpp = &jp1->prev_job; |
| } |
| /* FALLTHROUGH */ |
| #if JOBS |
| case CUR_STOPPED: |
| #endif |
| /* newly stopped job - becomes curjob */ |
| jp->prev_job = *jpp; |
| *jpp = jp; |
| break; |
| } |
| } |
| |
| #if JOBS || DEBUG |
| static int |
| jobno(const struct job *jp) |
| { |
| return jp - jobtab + 1; |
| } |
| #endif |
| |
| /* |
| * Convert a job name to a job structure. |
| */ |
| #if !JOBS |
| #define getjob(name, getctl) getjob(name) |
| #endif |
| static struct job * |
| getjob(const char *name, int getctl) |
| { |
| struct job *jp; |
| struct job *found; |
| const char *err_msg = "%s: no such job"; |
| unsigned num; |
| int c; |
| const char *p; |
| char *(*match)(const char *, const char *); |
| |
| jp = curjob; |
| p = name; |
| if (!p) |
| goto currentjob; |
| |
| if (*p != '%') |
| goto err; |
| |
| c = *++p; |
| if (!c) |
| goto currentjob; |
| |
| if (!p[1]) { |
| if (c == '+' || c == '%') { |
| currentjob: |
| err_msg = "No current job"; |
| goto check; |
| } |
| if (c == '-') { |
| if (jp) |
| jp = jp->prev_job; |
| err_msg = "No previous job"; |
| check: |
| if (!jp) |
| goto err; |
| goto gotit; |
| } |
| } |
| |
| if (is_number(p)) { |
| num = atoi(p); |
| if (num > 0 && num <= njobs) { |
| jp = jobtab + num - 1; |
| if (jp->used) |
| goto gotit; |
| goto err; |
| } |
| } |
| |
| match = prefix; |
| if (*p == '?') { |
| match = strstr; |
| p++; |
| } |
| |
| found = NULL; |
| while (jp) { |
| if (match(jp->ps[0].ps_cmd, p)) { |
| if (found) |
| goto err; |
| found = jp; |
| err_msg = "%s: ambiguous"; |
| } |
| jp = jp->prev_job; |
| } |
| if (!found) |
| goto err; |
| jp = found; |
| |
| gotit: |
| #if JOBS |
| err_msg = "job %s not created under job control"; |
| if (getctl && jp->jobctl == 0) |
| goto err; |
| #endif |
| return jp; |
| err: |
| ash_msg_and_raise_error(err_msg, name); |
| } |
| |
| /* |
| * Mark a job structure as unused. |
| */ |
| static void |
| freejob(struct job *jp) |
| { |
| struct procstat *ps; |
| int i; |
| |
| INT_OFF; |
| for (i = jp->nprocs, ps = jp->ps; --i >= 0; ps++) { |
| if (ps->ps_cmd != nullstr) |
| free(ps->ps_cmd); |
| } |
| if (jp->ps != &jp->ps0) |
| free(jp->ps); |
| jp->used = 0; |
| set_curjob(jp, CUR_DELETE); |
| INT_ON; |
| } |
| |
| #if JOBS |
| static void |
| xtcsetpgrp(int fd, pid_t pgrp) |
| { |
| if (tcsetpgrp(fd, pgrp)) |
| ash_msg_and_raise_error("can't set tty process group (%m)"); |
| } |
| |
| /* |
| * Turn job control on and off. |
| * |
| * Note: This code assumes that the third arg to ioctl is a character |
| * pointer, which is true on Berkeley systems but not System V. Since |
| * System V doesn't have job control yet, this isn't a problem now. |
| * |
| * Called with interrupts off. |
| */ |
| static void |
| setjobctl(int on) |
| { |
| int fd; |
| int pgrp; |
| |
| if (on == doing_jobctl || rootshell == 0) |
| return; |
| if (on) { |
| int ofd; |
| ofd = fd = open(_PATH_TTY, O_RDWR); |
| if (fd < 0) { |
| /* BTW, bash will try to open(ttyname(0)) if open("/dev/tty") fails. |
| * That sometimes helps to acquire controlling tty. |
| * Obviously, a workaround for bugs when someone |
| * failed to provide a controlling tty to bash! :) */ |
| fd = 2; |
| while (!isatty(fd)) |
| if (--fd < 0) |
| goto out; |
| } |
| /* fd is a tty at this point */ |
| fd = fcntl(fd, F_DUPFD, 10); |
| if (ofd >= 0) /* if it is "/dev/tty", close. If 0/1/2, don't */ |
| close(ofd); |
| if (fd < 0) |
| goto out; /* F_DUPFD failed */ |
| close_on_exec_on(fd); |
| while (1) { /* while we are in the background */ |
| pgrp = tcgetpgrp(fd); |
| if (pgrp < 0) { |
| out: |
| ash_msg("can't access tty; job control turned off"); |
| mflag = on = 0; |
| goto close; |
| } |
| if (pgrp == getpgrp()) |
| break; |
| killpg(0, SIGTTIN); |
| } |
| initialpgrp = pgrp; |
| |
| setsignal(SIGTSTP); |
| setsignal(SIGTTOU); |
| setsignal(SIGTTIN); |
| pgrp = rootpid; |
| setpgid(0, pgrp); |
| xtcsetpgrp(fd, pgrp); |
| } else { |
| /* turning job control off */ |
| fd = ttyfd; |
| pgrp = initialpgrp; |
| /* was xtcsetpgrp, but this can make exiting ash |
| * loop forever if pty is already deleted */ |
| tcsetpgrp(fd, pgrp); |
| setpgid(0, pgrp); |
| setsignal(SIGTSTP); |
| setsignal(SIGTTOU); |
| setsignal(SIGTTIN); |
| close: |
| if (fd >= 0) |
| close(fd); |
| fd = -1; |
| } |
| ttyfd = fd; |
| doing_jobctl = on; |
| } |
| |
| static int FAST_FUNC |
| killcmd(int argc, char **argv) |
| { |
| if (argv[1] && strcmp(argv[1], "-l") != 0) { |
| int i = 1; |
| do { |
| if (argv[i][0] == '%') { |
| /* |
| * "kill %N" - job kill |
| * Converting to pgrp / pid kill |
| */ |
| struct job *jp; |
| char *dst; |
| int j, n; |
| |
| jp = getjob(argv[i], 0); |
| /* |
| * In jobs started under job control, we signal |
| * entire process group by kill -PGRP_ID. |
| * This happens, f.e., in interactive shell. |
| * |
| * Otherwise, we signal each child via |
| * kill PID1 PID2 PID3. |
| * Testcases: |
| * sh -c 'sleep 1|sleep 1 & kill %1' |
| * sh -c 'true|sleep 2 & sleep 1; kill %1' |
| * sh -c 'true|sleep 1 & sleep 2; kill %1' |
| */ |
| n = jp->nprocs; /* can't be 0 (I hope) */ |
| if (jp->jobctl) |
| n = 1; |
| dst = alloca(n * sizeof(int)*4); |
| argv[i] = dst; |
| for (j = 0; j < n; j++) { |
| struct procstat *ps = &jp->ps[j]; |
| /* Skip non-running and not-stopped members |
| * (i.e. dead members) of the job |
| */ |
| if (ps->ps_status != -1 && !WIFSTOPPED(ps->ps_status)) |
| continue; |
| /* |
| * kill_main has matching code to expect |
| * leading space. Needed to not confuse |
| * negative pids with "kill -SIGNAL_NO" syntax |
| */ |
| dst += sprintf(dst, jp->jobctl ? " -%u" : " %u", (int)ps->ps_pid); |
| } |
| *dst = '\0'; |
| } |
| } while (argv[++i]); |
| } |
| return kill_main(argc, argv); |
| } |
| |
| static void |
| showpipe(struct job *jp /*, FILE *out*/) |
| { |
| struct procstat *ps; |
| struct procstat *psend; |
| |
| psend = jp->ps + jp->nprocs; |
| for (ps = jp->ps + 1; ps < psend; ps++) |
| printf(" | %s", ps->ps_cmd); |
| newline_and_flush(stdout); |
| flush_stdout_stderr(); |
| } |
| |
| |
| static int |
| restartjob(struct job *jp, int mode) |
| { |
| struct procstat *ps; |
| int i; |
| int status; |
| pid_t pgid; |
| |
| INT_OFF; |
| if (jp->state == JOBDONE) |
| goto out; |
| jp->state = JOBRUNNING; |
| pgid = jp->ps[0].ps_pid; |
| if (mode == FORK_FG) { |
| get_tty_state(); |
| xtcsetpgrp(ttyfd, pgid); |
| } |
| killpg(pgid, SIGCONT); |
| ps = jp->ps; |
| i = jp->nprocs; |
| do { |
| if (WIFSTOPPED(ps->ps_status)) { |
| ps->ps_status = -1; |
| } |
| ps++; |
| } while (--i); |
| out: |
| status = (mode == FORK_FG) ? waitforjob(jp) : 0; |
| INT_ON; |
| return status; |
| } |
| |
| static int FAST_FUNC |
| fg_bgcmd(int argc UNUSED_PARAM, char **argv) |
| { |
| struct job *jp; |
| int mode; |
| int retval; |
| |
| mode = (**argv == 'f') ? FORK_FG : FORK_BG; |
| nextopt(nullstr); |
| argv = argptr; |
| do { |
| jp = getjob(*argv, 1); |
| if (mode == FORK_BG) { |
| set_curjob(jp, CUR_RUNNING); |
| printf("[%d] ", jobno(jp)); |
| } |
| out1str(jp->ps[0].ps_cmd); |
| showpipe(jp /*, stdout*/); |
| retval = restartjob(jp, mode); |
| } while (*argv && *++argv); |
| return retval; |
| } |
| #endif |
| |
| static int |
| sprint_status48(char *s, int status, int sigonly) |
| { |
| int col; |
| int st; |
| |
| col = 0; |
| if (!WIFEXITED(status)) { |
| if (JOBS && WIFSTOPPED(status)) |
| st = WSTOPSIG(status); |
| else |
| st = WTERMSIG(status); |
| if (sigonly) { |
| if (st == SIGINT || st == SIGPIPE) |
| goto out; |
| if (JOBS && WIFSTOPPED(status)) |
| goto out; |
| } |
| st &= 0x7f; |
| //TODO: use bbox's get_signame? strsignal adds ~600 bytes to text+rodata |
| col = fmtstr(s, 32, strsignal(st)); |
| if (WCOREDUMP(status)) { |
| strcpy(s + col, " (core dumped)"); |
| col += sizeof(" (core dumped)")-1; |
| } |
| } else if (!sigonly) { |
| st = WEXITSTATUS(status); |
| col = fmtstr(s, 16, (st ? "Done(%d)" : "Done"), st); |
| } |
| out: |
| return col; |
| } |
| |
| static int |
| wait_block_or_sig(int *status) |
| { |
| int pid; |
| |
| do { |
| sigset_t mask; |
| |
| /* Poll all children for changes in their state */ |
| got_sigchld = 0; |
| /* if job control is active, accept stopped processes too */ |
| pid = waitpid(-1, status, doing_jobctl ? (WNOHANG|WUNTRACED) : WNOHANG); |
| if (pid != 0) |
| break; /* Error (e.g. EINTR, ECHILD) or pid */ |
| |
| /* Children exist, but none are ready. Sleep until interesting signal */ |
| #if 1 |
| sigfillset(&mask); |
| sigprocmask(SIG_SETMASK, &mask, &mask); |
| while (!got_sigchld && !pending_sig) |
| sigsuspend(&mask); |
| sigprocmask(SIG_SETMASK, &mask, NULL); |
| #else /* unsafe: a signal can set pending_sig after check, but before pause() */ |
| while (!got_sigchld && !pending_sig) |
| pause(); |
| #endif |
| |
| /* If it was SIGCHLD, poll children again */ |
| } while (got_sigchld); |
| |
| return pid; |
| } |
| |
| #define DOWAIT_NONBLOCK 0 |
| #define DOWAIT_BLOCK 1 |
| #define DOWAIT_BLOCK_OR_SIG 2 |
| |
| static int |
| dowait(int block, struct job *job) |
| { |
| int pid; |
| int status; |
| struct job *jp; |
| struct job *thisjob = NULL; |
| |
| TRACE(("dowait(0x%x) called\n", block)); |
| |
| /* It's wrong to call waitpid() outside of INT_OFF region: |
| * signal can arrive just after syscall return and handler can |
| * longjmp away, losing stop/exit notification processing. |
| * Thus, for "jobs" builtin, and for waiting for a fg job, |
| * we call waitpid() (blocking or non-blocking) inside INT_OFF. |
| * |
| * However, for "wait" builtin it is wrong to simply call waitpid() |
| * in INT_OFF region: "wait" needs to wait for any running job |
| * to change state, but should exit on any trap too. |
| * In INT_OFF region, a signal just before syscall entry can set |
| * pending_sig variables, but we can't check them, and we would |
| * either enter a sleeping waitpid() (BUG), or need to busy-loop. |
| * |
| * Because of this, we run inside INT_OFF, but use a special routine |
| * which combines waitpid() and sigsuspend(). |
| * This is the reason why we need to have a handler for SIGCHLD: |
| * SIG_DFL handler does not wake sigsuspend(). |
| */ |
| INT_OFF; |
| if (block == DOWAIT_BLOCK_OR_SIG) { |
| pid = wait_block_or_sig(&status); |
| } else { |
| int wait_flags = 0; |
| if (block == DOWAIT_NONBLOCK) |
| wait_flags = WNOHANG; |
| /* if job control is active, accept stopped processes too */ |
| if (doing_jobctl) |
| wait_flags |= WUNTRACED; |
| /* NB: _not_ safe_waitpid, we need to detect EINTR */ |
| pid = waitpid(-1, &status, wait_flags); |
| } |
| TRACE(("wait returns pid=%d, status=0x%x, errno=%d(%s)\n", |
| pid, status, errno, strerror(errno))); |
| if (pid <= 0) |
| goto out; |
| |
| thisjob = NULL; |
| for (jp = curjob; jp; jp = jp->prev_job) { |
| int jobstate; |
| struct procstat *ps; |
| struct procstat *psend; |
| if (jp->state == JOBDONE) |
| continue; |
| jobstate = JOBDONE; |
| ps = jp->ps; |
| psend = ps + jp->nprocs; |
| do { |
| if (ps->ps_pid == pid) { |
| TRACE(("Job %d: changing status of proc %d " |
| "from 0x%x to 0x%x\n", |
| jobno(jp), pid, ps->ps_status, status)); |
| ps->ps_status = status; |
| thisjob = jp; |
| } |
| if (ps->ps_status == -1) |
| jobstate = JOBRUNNING; |
| #if JOBS |
| if (jobstate == JOBRUNNING) |
| continue; |
| if (WIFSTOPPED(ps->ps_status)) { |
| jp->stopstatus = ps->ps_status; |
| jobstate = JOBSTOPPED; |
| } |
| #endif |
| } while (++ps < psend); |
| if (!thisjob) |
| continue; |
| |
| /* Found the job where one of its processes changed its state. |
| * Is there at least one live and running process in this job? */ |
| if (jobstate != JOBRUNNING) { |
| /* No. All live processes in the job are stopped |
| * (JOBSTOPPED) or there are no live processes (JOBDONE) |
| */ |
| thisjob->changed = 1; |
| if (thisjob->state != jobstate) { |
| TRACE(("Job %d: changing state from %d to %d\n", |
| jobno(thisjob), thisjob->state, jobstate)); |
| thisjob->state = jobstate; |
| #if JOBS |
| if (jobstate == JOBSTOPPED) |
| set_curjob(thisjob, CUR_STOPPED); |
| #endif |
| } |
| } |
| goto out; |
| } |
| /* The process wasn't found in job list */ |
| if (JOBS && !WIFSTOPPED(status)) |
| jobless--; |
| out: |
| INT_ON; |
| |
| if (thisjob && thisjob == job) { |
| char s[48 + 1]; |
| int len; |
| |
| len = sprint_status48(s, status, 1); |
| if (len) { |
| s[len] = '\n'; |
| s[len + 1] = '\0'; |
| out2str(s); |
| } |
| } |
| return pid; |
| } |
| |
| #if JOBS |
| static void |
| showjob(struct job *jp, int mode) |
| { |
| struct procstat *ps; |
| struct procstat *psend; |
| int col; |
| int indent_col; |
| char s[16 + 16 + 48]; |
| FILE *out = (mode & SHOW_STDERR ? stderr : stdout); |
| |
| ps = jp->ps; |
| |
| if (mode & SHOW_ONLY_PGID) { /* jobs -p */ |
| /* just output process (group) id of pipeline */ |
| fprintf(out, "%d\n", ps->ps_pid); |
| return; |
| } |
| |
| col = fmtstr(s, 16, "[%d] ", jobno(jp)); |
| indent_col = col; |
| |
| if (jp == curjob) |
| s[col - 3] = '+'; |
| else if (curjob && jp == curjob->prev_job) |
| s[col - 3] = '-'; |
| |
| if (mode & SHOW_PIDS) |
| col += fmtstr(s + col, 16, "%d ", ps->ps_pid); |
| |
| psend = ps + jp->nprocs; |
| |
| if (jp->state == JOBRUNNING) { |
| strcpy(s + col, "Running"); |
| col += sizeof("Running") - 1; |
| } else { |
| int status = psend[-1].ps_status; |
| if (jp->state == JOBSTOPPED) |
| status = jp->stopstatus; |
| col += sprint_status48(s + col, status, 0); |
| } |
| /* By now, "[JOBID]* [maybe PID] STATUS" is printed */ |
| |
| /* This loop either prints "<cmd1> | <cmd2> | <cmd3>" line |
| * or prints several "PID | <cmdN>" lines, |
| * depending on SHOW_PIDS bit. |
| * We do not print status of individual processes |
| * between PID and <cmdN>. bash does it, but not very well: |
| * first line shows overall job status, not process status, |
| * making it impossible to know 1st process status. |
| */ |
| goto start; |
| do { |
| /* for each process */ |
| s[0] = '\0'; |
| col = 33; |
| if (mode & SHOW_PIDS) |
| col = fmtstr(s, 48, "\n%*c%d ", indent_col, ' ', ps->ps_pid) - 1; |
| start: |
| fprintf(out, "%s%*c%s%s", |
| s, |
| 33 - col >= 0 ? 33 - col : 0, ' ', |
| ps == jp->ps ? "" : "| ", |
| ps->ps_cmd |
| ); |
| } while (++ps != psend); |
| newline_and_flush(out); |
| |
| jp->changed = 0; |
| |
| if (jp->state == JOBDONE) { |
| TRACE(("showjob: freeing job %d\n", jobno(jp))); |
| freejob(jp); |
| } |
| } |
| |
| /* |
| * Print a list of jobs. If "change" is nonzero, only print jobs whose |
| * statuses have changed since the last call to showjobs. |
| */ |
| static void |
| showjobs(int mode) |
| { |
| struct job *jp; |
| |
| TRACE(("showjobs(0x%x) called\n", mode)); |
| |
| /* Handle all finished jobs */ |
| while (dowait(DOWAIT_NONBLOCK, NULL) > 0) |
| continue; |
| |
| for (jp = curjob; jp; jp = jp->prev_job) { |
| if (!(mode & SHOW_CHANGED) || jp->changed) { |
| showjob(jp, mode); |
| } |
| } |
| } |
| |
| static int FAST_FUNC |
| jobscmd(int argc UNUSED_PARAM, char **argv) |
| { |
| int mode, m; |
| |
| mode = 0; |
| while ((m = nextopt("lp")) != '\0') { |
| if (m == 'l') |
| mode |= SHOW_PIDS; |
| else |
| mode |= SHOW_ONLY_PGID; |
| } |
| |
| argv = argptr; |
| if (*argv) { |
| do |
| showjob(getjob(*argv, 0), mode); |
| while (*++argv); |
| } else { |
| showjobs(mode); |
| } |
| |
| return 0; |
| } |
| #endif /* JOBS */ |
| |
| /* Called only on finished or stopped jobs (no members are running) */ |
| static int |
| getstatus(struct job *job) |
| { |
| int status; |
| int retval; |
| struct procstat *ps; |
| |
| /* Fetch last member's status */ |
| ps = job->ps + job->nprocs - 1; |
| status = ps->ps_status; |
| if (pipefail) { |
| /* "set -o pipefail" mode: use last _nonzero_ status */ |
| while (status == 0 && --ps >= job->ps) |
| status = ps->ps_status; |
| } |
| |
| retval = WEXITSTATUS(status); |
| if (!WIFEXITED(status)) { |
| #if JOBS |
| retval = WSTOPSIG(status); |
| if (!WIFSTOPPED(status)) |
| #endif |
| { |
| /* XXX: limits number of signals */ |
| retval = WTERMSIG(status); |
| #if JOBS |
| if (retval == SIGINT) |
| job->sigint = 1; |
| #endif |
| } |
| retval += 128; |
| } |
| TRACE(("getstatus: job %d, nproc %d, status 0x%x, retval 0x%x\n", |
| jobno(job), job->nprocs, status, retval)); |
| return retval; |
| } |
| |
| static int FAST_FUNC |
| waitcmd(int argc UNUSED_PARAM, char **argv) |
| { |
| struct job *job; |
| int retval; |
| struct job *jp; |
| |
| nextopt(nullstr); |
| retval = 0; |
| |
| argv = argptr; |
| if (!*argv) { |
| /* wait for all jobs */ |
| for (;;) { |
| jp = curjob; |
| while (1) { |
| if (!jp) /* no running procs */ |
| goto ret; |
| if (jp->state == JOBRUNNING) |
| break; |
| jp->waited = 1; |
| jp = jp->prev_job; |
| } |
| /* man bash: |
| * "When bash is waiting for an asynchronous command via |
| * the wait builtin, the reception of a signal for which a trap |
| * has been set will cause the wait builtin to return immediately |
| * with an exit status greater than 128, immediately after which |
| * the trap is executed." |
| */ |
| dowait(DOWAIT_BLOCK_OR_SIG, NULL); |
| /* if child sends us a signal *and immediately exits*, |
| * dowait() returns pid > 0. Check this case, |
| * not "if (dowait() < 0)"! |
| */ |
| if (pending_sig) |
| goto sigout; |
| } |
| } |
| |
| retval = 127; |
| do { |
| if (**argv != '%') { |
| pid_t pid = number(*argv); |
| job = curjob; |
| while (1) { |
| if (!job) |
| goto repeat; |
| if (job->ps[job->nprocs - 1].ps_pid == pid) |
| break; |
| job = job->prev_job; |
| } |
| } else { |
| job = getjob(*argv, 0); |
| } |
| /* loop until process terminated or stopped */ |
| while (job->state == JOBRUNNING) { |
| dowait(DOWAIT_BLOCK_OR_SIG, NULL); |
| if (pending_sig) |
| goto sigout; |
| } |
| job->waited = 1; |
| retval = getstatus(job); |
| repeat: ; |
| } while (*++argv); |
| |
| ret: |
| return retval; |
| sigout: |
| retval = 128 + pending_sig; |
| return retval; |
| } |
| |
| static struct job * |
| growjobtab(void) |
| { |
| size_t len; |
| ptrdiff_t offset; |
| struct job *jp, *jq; |
| |
| len = njobs * sizeof(*jp); |
| jq = jobtab; |
| jp = ckrealloc(jq, len + 4 * sizeof(*jp)); |
| |
| offset = (char *)jp - (char *)jq; |
| if (offset) { |
| /* Relocate pointers */ |
| size_t l = len; |
| |
| jq = (struct job *)((char *)jq + l); |
| while (l) { |
| l -= sizeof(*jp); |
| jq--; |
| #define joff(p) ((struct job *)((char *)(p) + l)) |
| #define jmove(p) (p) = (void *)((char *)(p) + offset) |
| if (joff(jp)->ps == &jq->ps0) |
| jmove(joff(jp)->ps); |
| if (joff(jp)->prev_job) |
| jmove(joff(jp)->prev_job); |
| } |
| if (curjob) |
| jmove(curjob); |
| #undef joff |
| #undef jmove |
| } |
| |
| njobs += 4; |
| jobtab = jp; |
| jp = (struct job *)((char *)jp + len); |
| jq = jp + 3; |
| do { |
| jq->used = 0; |
| } while (--jq >= jp); |
| return jp; |
| } |
| |
| /* |
| * Return a new job structure. |
| * Called with interrupts off. |
| */ |
| static struct job * |
| makejob(/*union node *node,*/ int nprocs) |
| { |
| int i; |
| struct job *jp; |
| |
| for (i = njobs, jp = jobtab; ; jp++) { |
| if (--i < 0) { |
| jp = growjobtab(); |
| break; |
| } |
| if (jp->used == 0) |
| break; |
| if (jp->state != JOBDONE || !jp->waited) |
| continue; |
| #if JOBS |
| if (doing_jobctl) |
| continue; |
| #endif |
| freejob(jp); |
| break; |
| } |
| memset(jp, 0, sizeof(*jp)); |
| #if JOBS |
| /* jp->jobctl is a bitfield. |
| * "jp->jobctl |= doing_jobctl" likely to give awful code */ |
| if (doing_jobctl) |
| jp->jobctl = 1; |
| #endif |
| jp->prev_job = curjob; |
| curjob = jp; |
| jp->used = 1; |
| jp->ps = &jp->ps0; |
| if (nprocs > 1) { |
| jp->ps = ckmalloc(nprocs * sizeof(struct procstat)); |
| } |
| TRACE(("makejob(%d) returns %%%d\n", nprocs, |
| jobno(jp))); |
| return jp; |
| } |
| |
| #if JOBS |
| /* |
| * Return a string identifying a command (to be printed by the |
| * jobs command). |
| */ |
| static char *cmdnextc; |
| |
| static void |
| cmdputs(const char *s) |
| { |
| static const char vstype[VSTYPE + 1][3] = { |
| "", "}", "-", "+", "?", "=", |
| "%", "%%", "#", "##" |
| IF_BASH_SUBSTR(, ":") |
| IF_BASH_PATTERN_SUBST(, "/", "//") |
| }; |
| |
| const char *p, *str; |
| char cc[2]; |
| char *nextc; |
| unsigned char c; |
| unsigned char subtype = 0; |
| int quoted = 0; |
| |
| cc[1] = '\0'; |
| nextc = makestrspace((strlen(s) + 1) * 8, cmdnextc); |
| p = s; |
| while ((c = *p++) != '\0') { |
| str = NULL; |
| switch (c) { |
| case CTLESC: |
| c = *p++; |
| break; |
| case CTLVAR: |
| subtype = *p++; |
| if ((subtype & VSTYPE) == VSLENGTH) |
| str = "${#"; |
| else |
| str = "${"; |
| goto dostr; |
| case CTLENDVAR: |
| str = "\"}" + !(quoted & 1); |
| quoted >>= 1; |
| subtype = 0; |
| goto dostr; |
| case CTLBACKQ: |
| str = "$(...)"; |
| goto dostr; |
| #if ENABLE_FEATURE_SH_MATH |
| case CTLARI: |
| str = "$(("; |
| goto dostr; |
| case CTLENDARI: |
| str = "))"; |
| goto dostr; |
| #endif |
| case CTLQUOTEMARK: |
| quoted ^= 1; |
| c = '"'; |
| break; |
| case '=': |
| if (subtype == 0) |
| break; |
| if ((subtype & VSTYPE) != VSNORMAL) |
| quoted <<= 1; |
| str = vstype[subtype & VSTYPE]; |
| if (subtype & VSNUL) |
| c = ':'; |
| else |
| goto checkstr; |
| break; |
| case '\'': |
| case '\\': |
| case '"': |
| case '$': |
| /* These can only happen inside quotes */ |
| cc[0] = c; |
| str = cc; |
| c = '\\'; |
| break; |
| default: |
| break; |
| } |
| USTPUTC(c, nextc); |
| checkstr: |
| if (!str) |
| continue; |
| dostr: |
| while ((c = *str++) != '\0') { |
| USTPUTC(c, nextc); |
| } |
| } /* while *p++ not NUL */ |
| |
| if (quoted & 1) { |
| USTPUTC('"', nextc); |
| } |
| *nextc = 0; |
| cmdnextc = nextc; |
| } |
| |
| /* cmdtxt() and cmdlist() call each other */ |
| static void cmdtxt(union node *n); |
| |
| static void |
| cmdlist(union node *np, int sep) |
| { |
| for (; np; np = np->narg.next) { |
| if (!sep) |
| cmdputs(" "); |
| cmdtxt(np); |
| if (sep && np->narg.next) |
| cmdputs(" "); |
| } |
| } |
| |
| static void |
| cmdtxt(union node *n) |
| { |
| union node *np; |
| struct nodelist *lp; |
| const char *p; |
| |
| if (!n) |
| return; |
| switch (n->type) { |
| default: |
| #if DEBUG |
| abort(); |
| #endif |
| case NPIPE: |
| lp = n->npipe.cmdlist; |
| for (;;) { |
| cmdtxt(lp->n); |
| lp = lp->next; |
| if (!lp) |
| break; |
| cmdputs(" | "); |
| } |
| break; |
| case NSEMI: |
| p = "; "; |
| goto binop; |
| case NAND: |
| p = " && "; |
| goto binop; |
| case NOR: |
| p = " || "; |
| binop: |
| cmdtxt(n->nbinary.ch1); |
| cmdputs(p); |
| n = n->nbinary.ch2; |
| goto donode; |
| case NREDIR: |
| case NBACKGND: |
| n = n->nredir.n; |
| goto donode; |
| case NNOT: |
| cmdputs("!"); |
| n = n->nnot.com; |
| donode: |
| cmdtxt(n); |
| break; |
| case NIF: |
| cmdputs("if "); |
| cmdtxt(n->nif.test); |
| cmdputs("; then "); |
| if (n->nif.elsepart) { |
| cmdtxt(n->nif.ifpart); |
| cmdputs("; else "); |
| n = n->nif.elsepart; |
| } else { |
| n = n->nif.ifpart; |
| } |
| p = "; fi"; |
| goto dotail; |
| case NSUBSHELL: |
| cmdputs("("); |
| n = n->nredir.n; |
| p = ")"; |
| goto dotail; |
| case NWHILE: |
| p = "while "; |
| goto until; |
| case NUNTIL: |
| p = "until "; |
| until: |
| cmdputs(p); |
| cmdtxt(n->nbinary.ch1); |
| n = n->nbinary.ch2; |
| p = "; done"; |
| dodo: |
| cmdputs("; do "); |
| dotail: |
| cmdtxt(n); |
| goto dotail2; |
| case NFOR: |
| cmdputs("for "); |
| cmdputs(n->nfor.var); |
| cmdputs(" in "); |
| cmdlist(n->nfor.args, 1); |
| n = n->nfor.body; |
| p = "; done"; |
| goto dodo; |
| case NDEFUN: |
| cmdputs(n->narg.text); |
| p = "() { ... }"; |
| goto dotail2; |
| case NCMD: |
| cmdlist(n->ncmd.args, 1); |
| cmdlist(n->ncmd.redirect, 0); |
| break; |
| case NARG: |
| p = n->narg.text; |
| dotail2: |
| cmdputs(p); |
| break; |
| case NHERE: |
| case NXHERE: |
| p = "<<..."; |
| goto dotail2; |
| case NCASE: |
| cmdputs("case "); |
| cmdputs(n->ncase.expr->narg.text); |
| cmdputs(" in "); |
| for (np = n->ncase.cases; np; np = np->nclist.next) { |
| cmdtxt(np->nclist.pattern); |
| cmdputs(") "); |
| cmdtxt(np->nclist.body); |
| cmdputs(";; "); |
| } |
| p = "esac"; |
| goto dotail2; |
| case NTO: |
| p = ">"; |
| goto redir; |
| case NCLOBBER: |
| p = ">|"; |
| goto redir; |
| case NAPPEND: |
| p = ">>"; |
| goto redir; |
| #if BASH_REDIR_OUTPUT |
| case NTO2: |
| #endif |
| case NTOFD: |
| p = ">&"; |
| goto redir; |
| case NFROM: |
| p = "<"; |
| goto redir; |
| case NFROMFD: |
| p = "<&"; |
| goto redir; |
| case NFROMTO: |
| p = "<>"; |
| redir: |
| cmdputs(utoa(n->nfile.fd)); |
| cmdputs(p); |
| if (n->type == NTOFD || n->type == NFROMFD) { |
| cmdputs(utoa(n->ndup.dupfd)); |
| break; |
| } |
| n = n->nfile.fname; |
| goto donode; |
| } |
| } |
| |
| static char * |
| commandtext(union node *n) |
| { |
| char *name; |
| |
| STARTSTACKSTR(cmdnextc); |
| cmdtxt(n); |
| name = stackblock(); |
| TRACE(("commandtext: name %p, end %p\n", name, cmdnextc)); |
| return ckstrdup(name); |
| } |
| #endif /* JOBS */ |
| |
| /* |
| * Fork off a subshell. If we are doing job control, give the subshell its |
| * own process group. Jp is a job structure that the job is to be added to. |
| * N is the command that will be evaluated by the child. Both jp and n may |
| * be NULL. The mode parameter can be one of the following: |
| * FORK_FG - Fork off a foreground process. |
| * FORK_BG - Fork off a background process. |
| * FORK_NOJOB - Like FORK_FG, but don't give the process its own |
| * process group even if job control is on. |
| * |
| * When job control is turned off, background processes have their standard |
| * input redirected to /dev/null (except for the second and later processes |
| * in a pipeline). |
| * |
| * Called with interrupts off. |
| */ |
| /* |
| * Clear traps on a fork. |
| */ |
| static void |
| clear_traps(void) |
| { |
| char **tp; |
| |
| INT_OFF; |
| for (tp = trap; tp < &trap[NSIG]; tp++) { |
| if (*tp && **tp) { /* trap not NULL or "" (SIG_IGN) */ |
| if (trap_ptr == trap) |
| free(*tp); |
| /* else: it "belongs" to trap_ptr vector, don't free */ |
| *tp = NULL; |
| if ((tp - trap) != 0) |
| setsignal(tp - trap); |
| } |
| } |
| may_have_traps = 0; |
| INT_ON; |
| } |
| |
| /* Lives far away from here, needed for forkchild */ |
| static void closescript(void); |
| |
| /* Called after fork(), in child */ |
| /* jp and n are NULL when called by openhere() for heredoc support */ |
| static NOINLINE void |
| forkchild(struct job *jp, union node *n, int mode) |
| { |
| int oldlvl; |
| |
| TRACE(("Child shell %d\n", getpid())); |
| oldlvl = shlvl; |
| shlvl++; |
| |
| /* man bash: "Non-builtin commands run by bash have signal handlers |
| * set to the values inherited by the shell from its parent". |
| * Do we do it correctly? */ |
| |
| closescript(); |
| |
| if (mode == FORK_NOJOB /* is it `xxx` ? */ |
| && n && n->type == NCMD /* is it single cmd? */ |
| /* && n->ncmd.args->type == NARG - always true? */ |
| && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "trap") == 0 |
| && n->ncmd.args->narg.next == NULL /* "trap" with no arguments */ |
| /* && n->ncmd.args->narg.backquote == NULL - do we need to check this? */ |
| ) { |
| TRACE(("Trap hack\n")); |
| /* Awful hack for `trap` or $(trap). |
| * |
| * http://www.opengroup.org/onlinepubs/009695399/utilities/trap.html |
| * contains an example where "trap" is executed in a subshell: |
| * |
| * save_traps=$(trap) |
| * ... |
| * eval "$save_traps" |
| * |
| * Standard does not say that "trap" in subshell shall print |
| * parent shell's traps. It only says that its output |
| * must have suitable form, but then, in the above example |
| * (which is not supposed to be normative), it implies that. |
| * |
| * bash (and probably other shell) does implement it |
| * (traps are reset to defaults, but "trap" still shows them), |
| * but as a result, "trap" logic is hopelessly messed up: |
| * |
| * # trap |
| * trap -- 'echo Ho' SIGWINCH <--- we have a handler |
| * # (trap) <--- trap is in subshell - no output (correct, traps are reset) |
| * # true | trap <--- trap is in subshell - no output (ditto) |
| * # echo `true | trap` <--- in subshell - output (but traps are reset!) |
| * trap -- 'echo Ho' SIGWINCH |
| * # echo `(trap)` <--- in subshell in subshell - output |
| * trap -- 'echo Ho' SIGWINCH |
| * # echo `true | (trap)` <--- in subshell in subshell in subshell - output! |
| * trap -- 'echo Ho' SIGWINCH |
| * |
| * The rules when to forget and when to not forget traps |
| * get really complex and nonsensical. |
| * |
| * Our solution: ONLY bare $(trap) or `trap` is special. |
| */ |
| /* Save trap handler strings for trap builtin to print */ |
| trap_ptr = xmemdup(trap, sizeof(trap)); |
| /* Fall through into clearing traps */ |
| } |
| clear_traps(); |
| #if JOBS |
| /* do job control only in root shell */ |
| doing_jobctl = 0; |
| if (mode != FORK_NOJOB && jp->jobctl && oldlvl == 0) { |
| pid_t pgrp; |
| |
| if (jp->nprocs == 0) |
| pgrp = getpid(); |
| else |
| pgrp = jp->ps[0].ps_pid; |
| /* this can fail because we are doing it in the parent also */ |
| setpgid(0, pgrp); |
| if (mode == FORK_FG) |
| xtcsetpgrp(ttyfd, pgrp); |
| setsignal(SIGTSTP); |
| setsignal(SIGTTOU); |
| } else |
| #endif |
| if (mode == FORK_BG) { |
| /* man bash: "When job control is not in effect, |
| * asynchronous commands ignore SIGINT and SIGQUIT" */ |
| ignoresig(SIGINT); |
| ignoresig(SIGQUIT); |
| if (jp->nprocs == 0) { |
| close(0); |
| if (open(bb_dev_null, O_RDONLY) != 0) |
| ash_msg_and_raise_error("can't open '%s'", bb_dev_null); |
| } |
| } |
| if (oldlvl == 0) { |
| if (iflag) { /* why if iflag only? */ |
| setsignal(SIGINT); |
| setsignal(SIGTERM); |
| } |
| /* man bash: |
| * "In all cases, bash ignores SIGQUIT. Non-builtin |
| * commands run by bash have signal handlers |
| * set to the values inherited by the shell |
| * from its parent". |
| * Take care of the second rule: */ |
| setsignal(SIGQUIT); |
| } |
| #if JOBS |
| if (n && n->type == NCMD |
| && n->ncmd.args && strcmp(n->ncmd.args->narg.text, "jobs") == 0 |
| ) { |
| TRACE(("Job hack\n")); |
| /* "jobs": we do not want to clear job list for it, |
| * instead we remove only _its_ own_ job from job list. |
| * This makes "jobs .... | cat" more useful. |
| */ |
| freejob(curjob); |
| return; |
| } |
| #endif |
| for (jp = curjob; jp; jp = jp->prev_job) |
| freejob(jp); |
| jobless = 0; |
| } |
| |
| /* Called after fork(), in parent */ |
| #if !JOBS |
| #define forkparent(jp, n, mode, pid) forkparent(jp, mode, pid) |
| #endif |
| static void |
| forkparent(struct job *jp, union node *n, int mode, pid_t pid) |
| { |
| TRACE(("In parent shell: child = %d\n", pid)); |
| if (!jp) { |
| /* jp is NULL when called by openhere() for heredoc support */ |
| while (jobless && dowait(DOWAIT_NONBLOCK, NULL) > 0) |
| continue; |
| jobless++; |
| return; |
| } |
| #if JOBS |
| if (mode != FORK_NOJOB && jp->jobctl) { |
| int pgrp; |
| |
| if (jp->nprocs == 0) |
| pgrp = pid; |
| else |
| pgrp = jp->ps[0].ps_pid; |
| /* This can fail because we are doing it in the child also */ |
| setpgid(pid, pgrp); |
| } |
| #endif |
| if (mode == FORK_BG) { |
| backgndpid = pid; /* set $! */ |
| set_curjob(jp, CUR_RUNNING); |
| } |
| if (jp) { |
| struct procstat *ps = &jp->ps[jp->nprocs++]; |
| ps->ps_pid = pid; |
| ps->ps_status = -1; |
| ps->ps_cmd = nullstr; |
| #if JOBS |
| if (doing_jobctl && n) |
| ps->ps_cmd = commandtext(n); |
| #endif |
| } |
| } |
| |
| /* jp and n are NULL when called by openhere() for heredoc support */ |
| static int |
| forkshell(struct job *jp, union node *n, int mode) |
| { |
| int pid; |
| |
| TRACE(("forkshell(%%%d, %p, %d) called\n", jobno(jp), n, mode)); |
| pid = fork(); |
| if (pid < 0) { |
| TRACE(("Fork failed, errno=%d", errno)); |
| if (jp) |
| freejob(jp); |
| ash_msg_and_raise_error("can't fork"); |
| } |
| if (pid == 0) { |
| CLEAR_RANDOM_T(&random_gen); /* or else $RANDOM repeats in child */ |
| forkchild(jp, n, mode); |
| } else { |
| forkparent(jp, n, mode, pid); |
| } |
| return pid; |
| } |
| |
| /* |
| * Wait for job to finish. |
| * |
| * Under job control we have the problem that while a child process |
| * is running interrupts generated by the user are sent to the child |
| * but not to the shell. This means that an infinite loop started by |
| * an interactive user may be hard to kill. With job control turned off, |
| * an interactive user may place an interactive program inside a loop. |
| * If the interactive program catches interrupts, the user doesn't want |
| * these interrupts to also abort the loop. The approach we take here |
| * is to have the shell ignore interrupt signals while waiting for a |
| * foreground process to terminate, and then send itself an interrupt |
| * signal if the child process was terminated by an interrupt signal. |
| * Unfortunately, some programs want to do a bit of cleanup and then |
| * exit on interrupt; unless these processes terminate themselves by |
| * sending a signal to themselves (instead of calling exit) they will |
| * confuse this approach. |
| * |
| * Called with interrupts off. |
| */ |
| static int |
| waitforjob(struct job *jp) |
| { |
| int st; |
| |
| TRACE(("waitforjob(%%%d) called\n", jobno(jp))); |
| |
| INT_OFF; |
| while (jp->state == JOBRUNNING) { |
| /* In non-interactive shells, we _can_ get |
| * a keyboard signal here and be EINTRed, |
| * but we just loop back, waiting for command to complete. |
| * |
| * man bash: |
| * "If bash is waiting for a command to complete and receives |
| * a signal for which a trap has been set, the trap |
| * will not be executed until the command completes." |
| * |
| * Reality is that even if trap is not set, bash |
| * will not act on the signal until command completes. |
| * Try this. sleep5intoff.c: |
| * #include <signal.h> |
| * #include <unistd.h> |
| * int main() { |
| * sigset_t set; |
| * sigemptyset(&set); |
| * sigaddset(&set, SIGINT); |
| * sigaddset(&set, SIGQUIT); |
| * sigprocmask(SIG_BLOCK, &set, NULL); |
| * sleep(5); |
| * return 0; |
| * } |
| * $ bash -c './sleep5intoff; echo hi' |
| * ^C^C^C^C <--- pressing ^C once a second |
| * $ _ |
| * $ bash -c './sleep5intoff; echo hi' |
| * ^\^\^\^\hi <--- pressing ^\ (SIGQUIT) |
| * $ _ |
| */ |
| dowait(DOWAIT_BLOCK, jp); |
| } |
| INT_ON; |
| |
| st = getstatus(jp); |
| #if JOBS |
| if (jp->jobctl) { |
| xtcsetpgrp(ttyfd, rootpid); |
| restore_tty_if_stopped_or_signaled(jp); |
| |
| /* |
| * This is truly gross. |
| * If we're doing job control, then we did a TIOCSPGRP which |
| * caused us (the shell) to no longer be in the controlling |
| * session -- so we wouldn't have seen any ^C/SIGINT. So, we |
| * intuit from the subprocess exit status whether a SIGINT |
| * occurred, and if so interrupt ourselves. Yuck. - mycroft |
| */ |
| if (jp->sigint) /* TODO: do the same with all signals */ |
| raise(SIGINT); /* ... by raise(jp->sig) instead? */ |
| } |
| if (jp->state == JOBDONE) |
| #endif |
| freejob(jp); |
| return st; |
| } |
| |
| /* |
| * return 1 if there are stopped jobs, otherwise 0 |
| */ |
| static int |
| stoppedjobs(void) |
| { |
| struct job *jp; |
| int retval; |
| |
| retval = 0; |
| if (job_warning) |
| goto out; |
| jp = curjob; |
| if (jp && jp->state == JOBSTOPPED) { |
| out2str("You have stopped jobs.\n"); |
| job_warning = 2; |
| retval++; |
| } |
| out: |
| return retval; |
| } |
| |
| |
| /* |
| * Code for dealing with input/output redirection. |
| */ |
| |
| #undef EMPTY |
| #undef CLOSED |
| #define EMPTY -2 /* marks an unused slot in redirtab */ |
| #define CLOSED -3 /* marks a slot of previously-closed fd */ |
| |
| /* |
| * Open a file in noclobber mode. |
| * The code was copied from bash. |
| */ |
| static int |
| noclobberopen(const char *fname) |
| { |
| int r, fd; |
| struct stat finfo, finfo2; |
| |
| /* |
| * If the file exists and is a regular file, return an error |
| * immediately. |
| */ |
| r = stat(fname, &finfo); |
| if (r == 0 && S_ISREG(finfo.st_mode)) { |
| errno = EEXIST; |
| return -1; |
| } |
| |
| /* |
| * If the file was not present (r != 0), make sure we open it |
| * exclusively so that if it is created before we open it, our open |
| * will fail. Make sure that we do not truncate an existing file. |
| * Note that we don't turn on O_EXCL unless the stat failed -- if the |
| * file was not a regular file, we leave O_EXCL off. |
| */ |
| if (r != 0) |
| return open(fname, O_WRONLY|O_CREAT|O_EXCL, 0666); |
| fd = open(fname, O_WRONLY|O_CREAT, 0666); |
| |
| /* If the open failed, return the file descriptor right away. */ |
| if (fd < 0) |
| return fd; |
| |
| /* |
| * OK, the open succeeded, but the file may have been changed from a |
| * non-regular file to a regular file between the stat and the open. |
| * We are assuming that the O_EXCL open handles the case where FILENAME |
| * did not exist and is symlinked to an existing file between the stat |
| * and open. |
| */ |
| |
| /* |
| * If we can open it and fstat the file descriptor, and neither check |
| * revealed that it was a regular file, and the file has not been |
| * replaced, return the file descriptor. |
| */ |
| if (fstat(fd, &finfo2) == 0 |
| && !S_ISREG(finfo2.st_mode) |
| && finfo.st_dev == finfo2.st_dev |
| && finfo.st_ino == finfo2.st_ino |
| ) { |
| return fd; |
| } |
| |
| /* The file has been replaced. badness. */ |
| close(fd); |
| errno = EEXIST; |
| return -1; |
| } |
| |
| /* |
| * Handle here documents. Normally we fork off a process to write the |
| * data to a pipe. If the document is short, we can stuff the data in |
| * the pipe without forking. |
| */ |
| /* openhere needs this forward reference */ |
| static void expandhere(union node *arg, int fd); |
| static int |
| openhere(union node *redir) |
| { |
| int pip[2]; |
| size_t len = 0; |
| |
| if (pipe(pip) < 0) |
| ash_msg_and_raise_error("pipe call failed"); |
| if (redir->type == NHERE) { |
| len = strlen(redir->nhere.doc->narg.text); |
| if (len <= PIPE_BUF) { |
| full_write(pip[1], redir->nhere.doc->narg.text, len); |
| goto out; |
| } |
| } |
| if (forkshell((struct job *)NULL, (union node *)NULL, FORK_NOJOB) == 0) { |
| /* child */ |
| close(pip[0]); |
| ignoresig(SIGINT); //signal(SIGINT, SIG_IGN); |
| ignoresig(SIGQUIT); //signal(SIGQUIT, SIG_IGN); |
| ignoresig(SIGHUP); //signal(SIGHUP, SIG_IGN); |
| ignoresig(SIGTSTP); //signal(SIGTSTP, SIG_IGN); |
| signal(SIGPIPE, SIG_DFL); |
| if (redir->type == NHERE) |
| full_write(pip[1], redir->nhere.doc->narg.text, len); |
| else /* NXHERE */ |
| expandhere(redir->nhere.doc, pip[1]); |
| _exit(EXIT_SUCCESS); |
| } |
| out: |
| close(pip[1]); |
| return pip[0]; |
| } |
| |
| static int |
| openredirect(union node *redir) |
| { |
| char *fname; |
| int f; |
| |
| switch (redir->nfile.type) { |
| /* Can't happen, our single caller does this itself */ |
| // case NTOFD: |
| // case NFROMFD: |
| // return -1; |
| case NHERE: |
| case NXHERE: |
| return openhere(redir); |
| } |
| |
| /* For N[X]HERE, reading redir->nfile.expfname would touch beyond |
| * allocated space. Do it only when we know it is safe. |
| */ |
| fname = redir->nfile.expfname; |
| |
| switch (redir->nfile.type) { |
| default: |
| #if DEBUG |
| abort(); |
| #endif |
| case NFROM: |
| f = open(fname, O_RDONLY); |
| if (f < 0) |
| goto eopen; |
| break; |
| case NFROMTO: |
| f = open(fname, O_RDWR|O_CREAT, 0666); |
| if (f < 0) |
| goto ecreate; |
| break; |
| case NTO: |
| #if BASH_REDIR_OUTPUT |
| case NTO2: |
| #endif |
| /* Take care of noclobber mode. */ |
| if (Cflag) { |
| f = noclobberopen(fname); |
| if (f < 0) |
| goto ecreate; |
| break; |
| } |
| /* FALLTHROUGH */ |
| case NCLOBBER: |
| f = open(fname, O_WRONLY|O_CREAT|O_TRUNC, 0666); |
| if (f < 0) |
| goto ecreate; |
| break; |
| case NAPPEND: |
| f = open(fname, O_WRONLY|O_CREAT|O_APPEND, 0666); |
| if (f < 0) |
| goto ecreate; |
| break; |
| } |
| |
| return f; |
| ecreate: |
| ash_msg_and_raise_error("can't create %s: %s", fname, errmsg(errno, "nonexistent directory")); |
| eopen: |
| ash_msg_and_raise_error("can't open %s: %s", fname, errmsg(errno, "no such file")); |
| } |
| |
| /* |
| * Copy a file descriptor to be >= 10. Throws exception on error. |
| */ |
| static int |
| savefd(int from) |
| { |
| int newfd; |
| int err; |
| |
| newfd = fcntl(from, F_DUPFD, 10); |
| err = newfd < 0 ? errno : 0; |
| if (err != EBADF) { |
| if (err) |
| ash_msg_and_raise_error("%d: %m", from); |
| close(from); |
| fcntl(newfd, F_SETFD, FD_CLOEXEC); |
| } |
| |
| return newfd; |
| } |
| static int |
| dup2_or_raise(int from, int to) |
| { |
| int newfd; |
| |
| newfd = (from != to) ? dup2(from, to) : to; |
| if (newfd < 0) { |
| /* Happens when source fd is not open: try "echo >&99" */ |
| ash_msg_and_raise_error("%d: %m", from); |
| } |
| return newfd; |
| } |
| |
| /* Struct def and variable are moved down to the first usage site */ |
| struct two_fd_t { |
| int orig, copy; |
| }; |
| struct redirtab { |
| struct redirtab *next; |
| int pair_count; |
| struct two_fd_t two_fd[]; |
| }; |
| #define redirlist (G_var.redirlist) |
| enum { |
| COPYFD_RESTORE = (int)~(INT_MAX), |
| }; |
| |
| static int |
| need_to_remember(struct redirtab *rp, int fd) |
| { |
| int i; |
| |
| if (!rp) /* remembering was not requested */ |
| return 0; |
| |
| for (i = 0; i < rp->pair_count; i++) { |
| if (rp->two_fd[i].orig == fd) { |
| /* already remembered */ |
| return 0; |
| } |
| } |
| return 1; |
| } |
| |
| /* "hidden" fd is a fd used to read scripts, or a copy of such */ |
| static int |
| is_hidden_fd(struct redirtab *rp, int fd) |
| { |
| int i; |
| struct parsefile *pf; |
| |
| if (fd == -1) |
| return 0; |
| /* Check open scripts' fds */ |
| pf = g_parsefile; |
| while (pf) { |
| /* We skip pf_fd == 0 case because of the following case: |
| * $ ash # running ash interactively |
| * $ . ./script.sh |
| * and in script.sh: "exec 9>&0". |
| * Even though top-level pf_fd _is_ 0, |
| * it's still ok to use it: "read" builtin uses it, |
| * why should we cripple "exec" builtin? |
| */ |
| if (pf->pf_fd > 0 && fd == pf->pf_fd) { |
| return 1; |
| } |
| pf = pf->prev; |
| } |
| |
| if (!rp) |
| return 0; |
| /* Check saved fds of redirects */ |
| fd |= COPYFD_RESTORE; |
| for (i = 0; i < rp->pair_count; i++) { |
| if (rp->two_fd[i].copy == fd) { |
| return 1; |
| } |
| } |
| return 0; |
| } |
| |
| /* |
| * Process a list of redirection commands. If the REDIR_PUSH flag is set, |
| * old file descriptors are stashed away so that the redirection can be |
| * undone by calling popredir. |
| */ |
| /* flags passed to redirect */ |
| #define REDIR_PUSH 01 /* save previous values of file descriptors */ |
| #define REDIR_SAVEFD2 03 /* set preverrout */ |
| static void |
| redirect(union node *redir, int flags) |
| { |
| struct redirtab *sv; |
| int sv_pos; |
| int i; |
| int fd; |
| int newfd; |
| int copied_fd2 = -1; |
| |
| if (!redir) { |
| return; |
| } |
| |
| sv = NULL; |
| sv_pos = 0; |
| INT_OFF; |
| if (flags & REDIR_PUSH) { |
| union node *tmp = redir; |
| do { |
| sv_pos++; |
| #if BASH_REDIR_OUTPUT |
| if (tmp->nfile.type == NTO2) |
| sv_pos++; |
| #endif |
| tmp = tmp->nfile.next; |
| } while (tmp); |
| sv = ckmalloc(sizeof(*sv) + sv_pos * sizeof(sv->two_fd[0])); |
| sv->next = redirlist; |
| sv->pair_count = sv_pos; |
| redirlist = sv; |
| while (sv_pos > 0) { |
| sv_pos--; |
| sv->two_fd[sv_pos].orig = sv->two_fd[sv_pos].copy = EMPTY; |
| } |
| } |
| |
| do { |
| int right_fd = -1; |
| fd = redir->nfile.fd; |
| if (redir->nfile.type == NTOFD || redir->nfile.type == NFROMFD) { |
| right_fd = redir->ndup.dupfd; |
| //bb_error_msg("doing %d > %d", fd, right_fd); |
| /* redirect from/to same file descriptor? */ |
| if (right_fd == fd) |
| continue; |
| /* "echo >&10" and 10 is a fd opened to a sh script? */ |
| if (is_hidden_fd(sv, right_fd)) { |
| errno = EBADF; /* as if it is closed */ |
| ash_msg_and_raise_error("%d: %m", right_fd); |
| } |
| newfd = -1; |
| } else { |
| newfd = openredirect(redir); /* always >= 0 */ |
| if (fd == newfd) { |
| /* Descriptor wasn't open before redirect. |
| * Mark it for close in the future */ |
| if (need_to_remember(sv, fd)) { |
| goto remember_to_close; |
| } |
| continue; |
| } |
| } |
| #if BASH_REDIR_OUTPUT |
| redirect_more: |
| #endif |
| if (need_to_remember(sv, fd)) { |
| /* Copy old descriptor */ |
| /* Careful to not accidentally "save" |
| * to the same fd as right side fd in N>&M */ |
| int minfd = right_fd < 10 ? 10 : right_fd + 1; |
| #if defined(F_DUPFD_CLOEXEC) |
| i = fcntl(fd, F_DUPFD_CLOEXEC, minfd); |
| #else |
| i = fcntl(fd, F_DUPFD, minfd); |
| #endif |
| if (i == -1) { |
| i = errno; |
| if (i != EBADF) { |
| /* Strange error (e.g. "too many files" EMFILE?) */ |
| if (newfd >= 0) |
| close(newfd); |
| errno = i; |
| ash_msg_and_raise_error("%d: %m", fd); |
| /* NOTREACHED */ |
| } |
| /* EBADF: it is not open - good, remember to close it */ |
| remember_to_close: |
| i = CLOSED; |
| } else { /* fd is open, save its copy */ |
| #if !defined(F_DUPFD_CLOEXEC) |
| fcntl(i, F_SETFD, FD_CLOEXEC); |
| #endif |
| /* "exec fd>&-" should not close fds |
| * which point to script file(s). |
| * Force them to be restored afterwards */ |
| if (is_hidden_fd(sv, fd)) |
| i |= COPYFD_RESTORE; |
| } |
| if (fd == 2) |
| copied_fd2 = i; |
| sv->two_fd[sv_pos].orig = fd; |
| sv->two_fd[sv_pos].copy = i; |
| sv_pos++; |
| } |
| if (newfd < 0) { |
| /* NTOFD/NFROMFD: copy redir->ndup.dupfd to fd */ |
| if (redir->ndup.dupfd < 0) { /* "fd>&-" */ |
| /* Don't want to trigger debugging */ |
| if (fd != -1) |
| close(fd); |
| } else { |
| dup2_or_raise(redir->ndup.dupfd, fd); |
| } |
| } else if (fd != newfd) { /* move newfd to fd */ |
| dup2_or_raise(newfd, fd); |
| #if BASH_REDIR_OUTPUT |
| if (!(redir->nfile.type == NTO2 && fd == 2)) |
| #endif |
| close(newfd); |
| } |
| #if BASH_REDIR_OUTPUT |
| if (redir->nfile.type == NTO2 && fd == 1) { |
| /* We already redirected it to fd 1, now copy it to 2 */ |
| newfd = 1; |
| fd = 2; |
| goto redirect_more; |
| } |
| #endif |
| } while ((redir = redir->nfile.next) != NULL); |
| |
| INT_ON; |
| if ((flags & REDIR_SAVEFD2) && copied_fd2 >= 0) |
| preverrout_fd = copied_fd2; |
| } |
| |
| /* |
| * Undo the effects of the last redirection. |
| */ |
| static void |
| popredir(int drop, int restore) |
| { |
| struct redirtab *rp; |
| int i; |
| |
| if (redirlist == NULL) |
| return; |
| INT_OFF; |
| rp = redirlist; |
| for (i = 0; i < rp->pair_count; i++) { |
| int fd = rp->two_fd[i].orig; |
| int copy = rp->two_fd[i].copy; |
| if (copy == CLOSED) { |
| if (!drop) |
| close(fd); |
| continue; |
| } |
| if (copy != EMPTY) { |
| if (!drop || (restore && (copy & COPYFD_RESTORE))) { |
| copy &= ~COPYFD_RESTORE; |
| /*close(fd);*/ |
| dup2_or_raise(copy, fd); |
| } |
| close(copy & ~COPYFD_RESTORE); |
| } |
| } |
| redirlist = rp->next; |
| free(rp); |
| INT_ON; |
| } |
| |
| /* |
| * Undo all redirections. Called on error or interrupt. |
| */ |
| |
| static int |
| redirectsafe(union node *redir, int flags) |
| { |
| int err; |
| volatile int saveint; |
| struct jmploc *volatile savehandler = exception_handler; |
| struct jmploc jmploc; |
| |
| SAVE_INT(saveint); |
| /* "echo 9>/dev/null; echo >&9; echo result: $?" - result should be 1, not 2! */ |
| err = setjmp(jmploc.loc); // huh?? was = setjmp(jmploc.loc) * 2; |
| if (!err) { |
| exception_handler = &jmploc; |
| redirect(redir, flags); |
| } |
| exception_handler = savehandler; |
| if (err && exception_type != EXERROR) |
| longjmp(exception_handler->loc, 1); |
| RESTORE_INT(saveint); |
| return err; |
| } |
| |
| |
| /* ============ Routines to expand arguments to commands |
| * |
| * We have to deal with backquotes, shell variables, and file metacharacters. |
| */ |
| |
| #if ENABLE_FEATURE_SH_MATH |
| static arith_t |
| ash_arith(const char *s) |
| { |
| arith_state_t math_state; |
| arith_t result; |
| |
| math_state.lookupvar = lookupvar; |
| math_state.setvar = setvar0; |
| //math_state.endofname = endofname; |
| |
| INT_OFF; |
| result = arith(&math_state, s); |
| if (math_state.errmsg) |
| ash_msg_and_raise_error(math_state.errmsg); |
| INT_ON; |
| |
| return result; |
| } |
| #endif |
| |
| /* |
| * expandarg flags |
| */ |
| #define EXP_FULL 0x1 /* perform word splitting & file globbing */ |
| #define EXP_TILDE 0x2 /* do normal tilde expansion */ |
| #define EXP_VARTILDE 0x4 /* expand tildes in an assignment */ |
| #define EXP_REDIR 0x8 /* file glob for a redirection (1 match only) */ |
| /* ^^^^^^^^^^^^^^ this is meant to support constructs such as "cmd >file*.txt" |
| * POSIX says for this case: |
| * Pathname expansion shall not be performed on the word by a |
| * non-interactive shell; an interactive shell may perform it, but shall |
| * do so only when the expansion would result in one word. |
| * Currently, our code complies to the above rule by never globbing |
| * redirection filenames. |
| * Bash performs globbing, unless it is non-interactive and in POSIX mode. |
| * (this means that on a typical Linux distro, bash almost always |
| * performs globbing, and thus diverges from what we do). |
| */ |
| #define EXP_CASE 0x10 /* keeps quotes around for CASE pattern */ |
| #define EXP_QPAT 0x20 /* pattern in quoted parameter expansion */ |
| #define EXP_VARTILDE2 0x40 /* expand tildes after colons only */ |
| #define EXP_WORD 0x80 /* expand word in parameter expansion */ |
| #define EXP_QUOTED 0x100 /* expand word in double quotes */ |
| /* |
| * rmescape() flags |
| */ |
| #define RMESCAPE_ALLOC 0x1 /* Allocate a new string */ |
| #define RMESCAPE_GLOB 0x2 /* Add backslashes for glob */ |
| #define RMESCAPE_GROW 0x8 /* Grow strings instead of stalloc */ |
| #define RMESCAPE_HEAP 0x10 /* Malloc strings instead of stalloc */ |
| #define RMESCAPE_SLASH 0x20 /* Stop globbing after slash */ |
| |
| /* Add CTLESC when necessary. */ |
| #define QUOTES_ESC (EXP_FULL | EXP_CASE | EXP_QPAT | EXP_REDIR) |
| /* Do not skip NUL characters. */ |
| #define QUOTES_KEEPNUL EXP_TILDE |
| |
| /* |
| * Structure specifying which parts of the string should be searched |
| * for IFS characters. |
| */ |
| struct ifsregion { |
| struct ifsregion *next; /* next region in list */ |
| int begoff; /* offset of start of region */ |
| int endoff; /* offset of end of region */ |
| int nulonly; /* search for nul bytes only */ |
| }; |
| |
| struct arglist { |
| struct strlist *list; |
| struct strlist **lastp; |
| }; |
| |
| /* output of current string */ |
| static char *expdest; |
| /* list of back quote expressions */ |
| static struct nodelist *argbackq; |
| /* first struct in list of ifs regions */ |
| static struct ifsregion ifsfirst; |
| /* last struct in list */ |
| static struct ifsregion *ifslastp; |
| /* holds expanded arg list */ |
| static struct arglist exparg; |
| |
| /* |
| * Our own itoa(). |
| */ |
| #if !ENABLE_FEATURE_SH_MATH |
| /* cvtnum() is used even if math support is off (to prepare $? values and such) */ |
| typedef long arith_t; |
| # define ARITH_FMT "%ld" |
| #endif |
| static int |
| cvtnum(arith_t num) |
| { |
| int len; |
| |
| expdest = makestrspace(sizeof(arith_t)*3 + 2, expdest); |
| len = fmtstr(expdest, sizeof(arith_t)*3 + 2, ARITH_FMT, num); |
| STADJUST(len, expdest); |
| return len; |
| } |
| |
| /* |
| * Break the argument string into pieces based upon IFS and add the |
| * strings to the argument list. The regions of the string to be |
| * searched for IFS characters have been stored by recordregion. |
| */ |
| static void |
| ifsbreakup(char *string, struct arglist *arglist) |
| { |
| struct ifsregion *ifsp; |
| struct strlist *sp; |
| char *start; |
| char *p; |
| char *q; |
| const char *ifs, *realifs; |
| int ifsspc; |
| int nulonly; |
| |
| start = string; |
| if (ifslastp != NULL) { |
| ifsspc = 0; |
| nulonly = 0; |
| realifs = ifsset() ? ifsval() : defifs; |
| ifsp = &ifsfirst; |
| do { |
| p = string + ifsp->begoff; |
| nulonly = ifsp->nulonly; |
| ifs = nulonly ? nullstr : realifs; |
| ifsspc = 0; |
| while (p < string + ifsp->endoff) { |
| q = p; |
| if ((unsigned char)*p == CTLESC) |
| p++; |
| if (!strchr(ifs, *p)) { |
| p++; |
| continue; |
| } |
| if (!nulonly) |
| ifsspc = (strchr(defifs, *p) != NULL); |
| /* Ignore IFS whitespace at start */ |
| if (q == start && ifsspc) { |
| p++; |
| start = p; |
| continue; |
| } |
| *q = '\0'; |
| sp = stzalloc(sizeof(*sp)); |
| sp->text = start; |
| *arglist->lastp = sp; |
| arglist->lastp = &sp->next; |
| p++; |
| if (!nulonly) { |
| for (;;) { |
| if (p >= string + ifsp->endoff) { |
| break; |
| } |
| q = p; |
| if ((unsigned char)*p == CTLESC) |
| p++; |
| if (strchr(ifs, *p) == NULL) { |
| p = q; |
| break; |
| } |
| if (strchr(defifs, *p) == NULL) { |
| if (ifsspc) { |
| p++; |
| ifsspc = 0; |
| } else { |
| p = q; |
| break; |
| } |
| } else |
| p++; |
| } |
| } |
| start = p; |
| } /* while */ |
| ifsp = ifsp->next; |
| } while (ifsp != NULL); |
| if (nulonly) |
| goto add; |
| } |
| |
| if (!*start) |
| return; |
| |
| add: |
| sp = stzalloc(sizeof(*sp)); |
| sp->text = start; |
| *arglist->lastp = sp; |
| arglist->lastp = &sp->next; |
| } |
| |
| static void |
| ifsfree(void) |
| { |
| struct ifsregion *p = ifsfirst.next; |
| |
| if (!p) |
| goto out; |
| |
| INT_OFF; |
| do { |
| struct ifsregion *ifsp; |
| ifsp = p->next; |
| free(p); |
| p = ifsp; |
| } while (p); |
| ifsfirst.next = NULL; |
| INT_ON; |
| out: |
| ifslastp = NULL; |
| } |
| |
| static size_t |
| esclen(const char *start, const char *p) |
| { |
| size_t esc = 0; |
| |
| while (p > start && (unsigned char)*--p == CTLESC) { |
| esc++; |
| } |
| return esc; |
| } |
| |
| /* |
| * Remove any CTLESC characters from a string. |
| */ |
| static char * |
| rmescapes(char *str, int flag) |
| { |
| static const char qchars[] ALIGN1 = { |
| IF_BASH_PATTERN_SUBST('/',) CTLESC, CTLQUOTEMARK, '\0' }; |
| |
| char *p, *q, *r; |
| unsigned inquotes; |
| unsigned protect_against_glob; |
| unsigned globbing; |
| IF_BASH_PATTERN_SUBST(unsigned slash = flag & RMESCAPE_SLASH;) |
| |
| p = strpbrk(str, qchars IF_BASH_PATTERN_SUBST(+ !slash)); |
| if (!p) |
| return str; |
| |
| q = p; |
| r = str; |
| if (flag & RMESCAPE_ALLOC) { |
| size_t len = p - str; |
| size_t fulllen = len + strlen(p) + 1; |
| |
| if (flag & RMESCAPE_GROW) { |
| int strloc = str - (char *)stackblock(); |
| r = makestrspace(fulllen, expdest); |
| /* p and str may be invalidated by makestrspace */ |
| str = (char *)stackblock() + strloc; |
| p = str + len; |
| } else if (flag & RMESCAPE_HEAP) { |
| r = ckmalloc(fulllen); |
| } else { |
| r = stalloc(fulllen); |
| } |
| q = r; |
| if (len > 0) { |
| q = (char *)memcpy(q, str, len) + len; |
| } |
| } |
| |
| inquotes = 0; |
| globbing = flag & RMESCAPE_GLOB; |
| protect_against_glob = globbing; |
| while (*p) { |
| if ((unsigned char)*p == CTLQUOTEMARK) { |
| // Note: both inquotes and protect_against_glob only affect whether |
| inquotes = ~inquotes; |
| p++; |
| protect_against_glob = globbing; |
| continue; |
| } |
| if ((unsigned char)*p == CTLESC) { |
| p++; |
| #if DEBUG |
| if (*p == '\0') |
| ash_msg_and_raise_error("CTLESC at EOL (shouldn't happen)"); |
| #endif |
| if (protect_against_glob) { |
| *q++ = '\\'; |
| } |
| } else if (*p == '\\' && !inquotes) { |
| /* naked back slash */ |
| protect_against_glob = 0; |
| goto copy; |
| } |
| #if BASH_PATTERN_SUBST |
| else if (*p == '/' && slash) { |
| /* stop handling globbing and mark location of slash */ |
| globbing = slash = 0; |
| *p = CTLESC; |
| } |
| #endif |
| protect_against_glob = globbing; |
| copy: |
| *q++ = *p++; |
| } |
| *q = '\0'; |
| if (flag & RMESCAPE_GROW) { |
| expdest = r; |
| STADJUST(q - r + 1, expdest); |
| } |
| return r; |
| } |
| #define pmatch(a, b) !fnmatch((a), (b), 0) |
| |
| /* |
| * Prepare a pattern for a expmeta (internal glob(3)) call. |
| * |
| * Returns an stalloced string. |
| */ |
| static char * |
| preglob(const char *pattern, int flag) |
| { |
| return rmescapes((char *)pattern, flag | RMESCAPE_GLOB); |
| } |
| |
| /* |
| * Put a string on the stack. |
| */ |
| static void |
| memtodest(const char *p, size_t len, int syntax, int quotes) |
| { |
| char *q; |
| |
| if (!len) |
| return; |
| |
| q = makestrspace((quotes & QUOTES_ESC) ? len * 2 : len, expdest); |
| |
| do { |
| unsigned char c = *p++; |
| if (c) { |
| if (quotes & QUOTES_ESC) { |
| int n = SIT(c, syntax); |
| if (n == CCTL |
| || (((quotes & EXP_FULL) || syntax != BASESYNTAX) |
| && n == CBACK |
| ) |
| ) { |
| USTPUTC(CTLESC, q); |
| } |
| } |
| } else if (!(quotes & QUOTES_KEEPNUL)) |
| continue; |
| USTPUTC(c, q); |
| } while (--len); |
| |
| expdest = q; |
| } |
| |
| static size_t |
| strtodest(const char *p, int syntax, int quotes) |
| { |
| size_t len = strlen(p); |
| memtodest(p, len, syntax, quotes); |
| return len; |
| } |
| |
| /* |
| * Record the fact that we have to scan this region of the |
| * string for IFS characters. |
| */ |
| static void |
| recordregion(int start, int end, int nulonly) |
| { |
| struct ifsregion *ifsp; |
| |
| if (ifslastp == NULL) { |
| ifsp = &ifsfirst; |
| } else { |
| INT_OFF; |
| ifsp = ckzalloc(sizeof(*ifsp)); |
| /*ifsp->next = NULL; - ckzalloc did it */ |
| ifslastp->next = ifsp; |
| INT_ON; |
| } |
| ifslastp = ifsp; |
| ifslastp->begoff = start; |
| ifslastp->endoff = end; |
| ifslastp->nulonly = nulonly; |
| } |
| |
| static void |
| removerecordregions(int endoff) |
| { |
| if (ifslastp == NULL) |
| return; |
| |
| if (ifsfirst.endoff > endoff) { |
| while (ifsfirst.next) { |
| struct ifsregion *ifsp; |
| INT_OFF; |
| ifsp = ifsfirst.next->next; |
| free(ifsfirst.next); |
| ifsfirst.next = ifsp; |
| INT_ON; |
| } |
| if (ifsfirst.begoff > endoff) { |
| ifslastp = NULL; |
| } else { |
| ifslastp = &ifsfirst; |
| ifsfirst.endoff = endoff; |
| } |
| return; |
| } |
| |
| ifslastp = &ifsfirst; |
| while (ifslastp->next && ifslastp->next->begoff < endoff) |
| ifslastp = ifslastp->next; |
| while (ifslastp->next) { |
| struct ifsregion *ifsp; |
| INT_OFF; |
| ifsp = ifslastp->next->next; |
| free(ifslastp->next); |
| ifslastp->next = ifsp; |
| INT_ON; |
| } |
| if (ifslastp->endoff > endoff) |
| ifslastp->endoff = endoff; |
| } |
| |
| static char * |
| exptilde(char *startp, char *p, int flags) |
| { |
| unsigned char c; |
| char *name; |
| struct passwd *pw; |
| const char *home; |
| int quotes = flags & QUOTES_ESC; |
| |
| name = p + 1; |
| |
| while ((c = *++p) != '\0') { |
| switch (c) { |
| case CTLESC: |
| return startp; |
| case CTLQUOTEMARK: |
| return startp; |
| case ':': |
| if (flags & EXP_VARTILDE) |
| goto done; |
| break; |
| case '/': |
| case CTLENDVAR: |
| goto done; |
| } |
| } |
| done: |
| *p = '\0'; |
| if (*name == '\0') { |
| home = lookupvar("HOME"); |
| } else { |
| pw = getpwnam(name); |
| if (pw == NULL) |
| goto lose; |
| home = pw->pw_dir; |
| } |
| if (!home || !*home) |
| goto lose; |
| *p = c; |
| strtodest(home, SQSYNTAX, quotes); |
| return p; |
| lose: |
| *p = c; |
| return startp; |
| } |
| |
| /* |
| * Execute a command inside back quotes. If it's a builtin command, we |
| * want to save its output in a block obtained from malloc. Otherwise |
| * we fork off a subprocess and get the output of the command via a pipe. |
| * Should be called with interrupts off. |
| */ |
| struct backcmd { /* result of evalbackcmd */ |
| int fd; /* file descriptor to read from */ |
| int nleft; /* number of chars in buffer */ |
| char *buf; /* buffer */ |
| struct job *jp; /* job structure for command */ |
| }; |
| |
| /* These forward decls are needed to use "eval" code for backticks handling: */ |
| #define EV_EXIT 01 /* exit after evaluating tree */ |
| static int evaltree(union node *, int); |
| |
| static void FAST_FUNC |
| evalbackcmd(union node *n, struct backcmd *result) |
| { |
| int pip[2]; |
| struct job *jp; |
| |
| result->fd = -1; |
| result->buf = NULL; |
| result->nleft = 0; |
| result->jp = NULL; |
| if (n == NULL) { |
| goto out; |
| } |
| |
| if (pipe(pip) < 0) |
| ash_msg_and_raise_error("pipe call failed"); |
| jp = makejob(/*n,*/ 1); |
| if (forkshell(jp, n, FORK_NOJOB) == 0) { |
| /* child */ |
| FORCE_INT_ON; |
| close(pip[0]); |
| if (pip[1] != 1) { |
| /*close(1);*/ |
| dup2_or_raise(pip[1], 1); |
| close(pip[1]); |
| } |
| /* TODO: eflag clearing makes the following not abort: |
| * ash -c 'set -e; z=$(false;echo foo); echo $z' |
| * which is what bash does (unless it is in POSIX mode). |
| * dash deleted "eflag = 0" line in the commit |
| * Date: Mon, 28 Jun 2010 17:11:58 +1000 |
| * [EVAL] Don't clear eflag in evalbackcmd |
| * For now, preserve bash-like behavior, it seems to be somewhat more useful: |
| */ |
| eflag = 0; |
| ifsfree(); |
| evaltree(n, EV_EXIT); /* actually evaltreenr... */ |
| /* NOTREACHED */ |
| } |
| /* parent */ |
| close(pip[1]); |
| result->fd = pip[0]; |
| result->jp = jp; |
| |
| out: |
| TRACE(("evalbackcmd done: fd=%d buf=0x%x nleft=%d jp=0x%x\n", |
| result->fd, result->buf, result->nleft, result->jp)); |
| } |
| |
| /* |
| * Expand stuff in backwards quotes. |
| */ |
| static void |
| expbackq(union node *cmd, int flag) |
| { |
| struct backcmd in; |
| int i; |
| char buf[128]; |
| char *p; |
| char *dest; |
| int startloc; |
| int syntax = flag & EXP_QUOTED ? DQSYNTAX : BASESYNTAX; |
| struct stackmark smark; |
| |
| INT_OFF; |
| startloc = expdest - (char *)stackblock(); |
| pushstackmark(&smark, startloc); |
| evalbackcmd(cmd, &in); |
| popstackmark(&smark); |
| |
| p = in.buf; |
| i = in.nleft; |
| if (i == 0) |
| goto read; |
| for (;;) { |
| memtodest(p, i, syntax, flag & QUOTES_ESC); |
| read: |
| if (in.fd < 0) |
| break; |
| i = nonblock_immune_read(in.fd, buf, sizeof(buf)); |
| TRACE(("expbackq: read returns %d\n", i)); |
| if (i <= 0) |
| break; |
| p = buf; |
| } |
| |
| free(in.buf); |
| if (in.fd >= 0) { |
| close(in.fd); |
| back_exitstatus = waitforjob(in.jp); |
| } |
| INT_ON; |
| |
| /* Eat all trailing newlines */ |
| dest = expdest; |
| for (; dest > (char *)stackblock() && dest[-1] == '\n';) |
| STUNPUTC(dest); |
| expdest = dest; |
| |
| if (!(flag & EXP_QUOTED)) |
| recordregion(startloc, dest - (char *)stackblock(), 0); |
| TRACE(("evalbackq: size:%d:'%.*s'\n", |
| (int)((dest - (char *)stackblock()) - startloc), |
| (int)((dest - (char *)stackblock()) - startloc), |
| stackblock() + startloc)); |
| } |
| |
| #if ENABLE_FEATURE_SH_MATH |
| /* |
| * Expand arithmetic expression. Backup to start of expression, |
| * evaluate, place result in (backed up) result, adjust string position. |
| */ |
| static void |
| expari(int flag) |
| { |
| char *p, *start; |
| int begoff; |
| int len; |
| |
| /* ifsfree(); */ |
| |
| /* |
| * This routine is slightly over-complicated for |
| * efficiency. Next we scan backwards looking for the |
| * start of arithmetic. |
| */ |
| start = stackblock(); |
| p = expdest - 1; |
| *p = '\0'; |
| p--; |
| while (1) { |
| int esc; |
| |
| while ((unsigned char)*p != CTLARI) { |
| p--; |
| #if DEBUG |
| if (p < start) { |
| ash_msg_and_raise_error("missing CTLARI (shouldn't happen)"); |
| } |
| #endif |
| } |
| |
| esc = esclen(start, p); |
| if (!(esc % 2)) { |
| break; |
| } |
| |
| p -= esc + 1; |
| } |
| |
| begoff = p - start; |
| |
| removerecordregions(begoff); |
| |
| expdest = p; |
| |
| if (flag & QUOTES_ESC) |
| rmescapes(p + 1, 0); |
| |
| len = cvtnum(ash_arith(p + 1)); |
| |
| if (!(flag & EXP_QUOTED)) |
| recordregion(begoff, begoff + len, 0); |
| } |
| #endif |
| |
| /* argstr needs it */ |
| static char *evalvar(char *p, int flags, struct strlist *var_str_list); |
| |
| /* |
| * Perform variable and command substitution. If EXP_FULL is set, output CTLESC |
| * characters to allow for further processing. Otherwise treat |
| * $@ like $* since no splitting will be performed. |
| * |
| * var_str_list (can be NULL) is a list of "VAR=val" strings which take precedence |
| * over shell variables. Needed for "A=a B=$A; echo $B" case - we use it |
| * for correct expansion of "B=$A" word. |
| */ |
| static void |
| argstr(char *p, int flags, struct strlist *var_str_list) |
| { |
| static const char spclchars[] ALIGN1 = { |
| '=', |
| ':', |
| CTLQUOTEMARK, |
| CTLENDVAR, |
| CTLESC, |
| CTLVAR, |
| CTLBACKQ, |
| #if ENABLE_FEATURE_SH_MATH |
| CTLENDARI, |
| #endif |
| '\0' |
| }; |
| const char *reject = spclchars; |
| int breakall = (flags & (EXP_WORD | EXP_QUOTED)) == EXP_WORD; |
| int inquotes; |
| size_t length; |
| int startloc; |
| |
| if (!(flags & EXP_VARTILDE)) { |
| reject += 2; |
| } else if (flags & EXP_VARTILDE2) { |
| reject++; |
| } |
| inquotes = 0; |
| length = 0; |
| if (flags & EXP_TILDE) { |
| char *q; |
| |
| flags &= ~EXP_TILDE; |
| tilde: |
| q = p; |
| if (*q == '~') |
| p = exptilde(p, q, flags); |
| } |
| start: |
| startloc = expdest - (char *)stackblock(); |
| for (;;) { |
| unsigned char c; |
| |
| length += strcspn(p + length, reject); |
| c = p[length]; |
| if (c) { |
| if (!(c & 0x80) |
| IF_FEATURE_SH_MATH(|| c == CTLENDARI) |
| ) { |
| /* c == '=' || c == ':' || c == CTLENDARI */ |
| length++; |
| } |
| } |
| if (length > 0) { |
| int newloc; |
| expdest = stack_nputstr(p, length, expdest); |
| newloc = expdest - (char *)stackblock(); |
| if (breakall && !inquotes && newloc > startloc) { |
| recordregion(startloc, newloc, 0); |
| } |
| startloc = newloc; |
| } |
| p += length + 1; |
| length = 0; |
| |
| switch (c) { |
| case '\0': |
| goto breakloop; |
| case '=': |
| if (flags & EXP_VARTILDE2) { |
| p--; |
| continue; |
| } |
| flags |= EXP_VARTILDE2; |
| reject++; |
| /* fall through */ |
| case ':': |
| /* |
| * sort of a hack - expand tildes in variable |
| * assignments (after the first '=' and after ':'s). |
| */ |
| if (*--p == '~') { |
| goto tilde; |
| } |
| continue; |
| } |
| |
| switch (c) { |
| case CTLENDVAR: /* ??? */ |
| goto breakloop; |
| case CTLQUOTEMARK: |
| inquotes ^= EXP_QUOTED; |
| /* "$@" syntax adherence hack */ |
| if (inquotes && !memcmp(p, dolatstr + 1, DOLATSTRLEN - 1)) { |
| p = evalvar(p + 1, flags | inquotes, /* var_str_list: */ NULL) + 1; |
| goto start; |
| } |
| addquote: |
| if (flags & QUOTES_ESC) { |
| p--; |
| length++; |
| startloc++; |
| } |
| break; |
| case CTLESC: |
| startloc++; |
| length++; |
| |
| /* |
| * Quoted parameter expansion pattern: remove quote |
| * unless inside inner quotes or we have a literal |
| * backslash. |
| */ |
| if (((flags | inquotes) & (EXP_QPAT | EXP_QUOTED)) == |
| EXP_QPAT && *p != '\\') |
| break; |
| |
| goto addquote; |
| case CTLVAR: |
| TRACE(("argstr: evalvar('%s')\n", p)); |
| p = evalvar(p, flags | inquotes, var_str_list); |
| TRACE(("argstr: evalvar:'%s'\n", (char *)stackblock())); |
| goto start; |
| case CTLBACKQ: |
| expbackq(argbackq->n, flags | inquotes); |
| argbackq = argbackq->next; |
| goto start; |
| #if ENABLE_FEATURE_SH_MATH |
| case CTLENDARI: |
| p--; |
| expari(flags | inquotes); |
| goto start; |
| #endif |
| } |
| } |
| breakloop: ; |
| } |
| |
| static char * |
| scanleft(char *startp, char *rmesc, char *rmescend UNUSED_PARAM, |
| char *pattern, int quotes, int zero) |
| { |
| char *loc, *loc2; |
| char c; |
| |
| loc = startp; |
| loc2 = rmesc; |
| do { |
| int match; |
| const char *s = loc2; |
| |
| c = *loc2; |
| if (zero) { |
| *loc2 = '\0'; |
| s = rmesc; |
| } |
| match = pmatch(pattern, s); |
| |
| *loc2 = c; |
| if (match) |
| return loc; |
| if (quotes && (unsigned char)*loc == CTLESC) |
| loc++; |
| loc++; |
| loc2++; |
| } while (c); |
| return NULL; |
| } |
| |
| static char * |
| scanright(char *startp, char *rmesc, char *rmescend, |
| char *pattern, int quotes, int match_at_start) |
| { |
| #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE |
| int try2optimize = match_at_start; |
| #endif |
| int esc = 0; |
| char *loc; |
| char *loc2; |
| |
| /* If we called by "${v/pattern/repl}" or "${v//pattern/repl}": |
| * startp="escaped_value_of_v" rmesc="raw_value_of_v" |
| * rmescend=""(ptr to NUL in rmesc) pattern="pattern" quotes=match_at_start=1 |
| * Logic: |
| * loc starts at NUL at the end of startp, loc2 starts at the end of rmesc, |
| * and on each iteration they go back two/one char until they reach the beginning. |
| * We try to find a match in "raw_value_of_v", "raw_value_of_", "raw_value_of" etc. |
| */ |
| /* TODO: document in what other circumstances we are called. */ |
| |
| for (loc = pattern - 1, loc2 = rmescend; loc >= startp; loc2--) { |
| int match; |
| char c = *loc2; |
| const char *s = loc2; |
| if (match_at_start) { |
| *loc2 = '\0'; |
| s = rmesc; |
| } |
| match = pmatch(pattern, s); |
| //bb_error_msg("pmatch(pattern:'%s',s:'%s'):%d", pattern, s, match); |
| *loc2 = c; |
| if (match) |
| return loc; |
| #if !ENABLE_ASH_OPTIMIZE_FOR_SIZE |
| if (try2optimize) { |
| /* Maybe we can optimize this: |
| * if pattern ends with unescaped *, we can avoid checking |
| * shorter strings: if "foo*" doesn't match "raw_value_of_v", |
| * it won't match truncated "raw_value_of_" strings too. |
| */ |
| unsigned plen = strlen(pattern); |
| /* Does it end with "*"? */ |
| if (plen != 0 && pattern[--plen] == '*') { |
| /* "xxxx*" is not escaped */ |
| /* "xxx\*" is escaped */ |
| /* "xx\\*" is not escaped */ |
| /* "x\\\*" is escaped */ |
| int slashes = 0; |
| while (plen != 0 && pattern[--plen] == '\\') |
| slashes++; |
| if (!(slashes & 1)) |
| break; /* ends with unescaped "*" */ |
| } |
| try2optimize = 0; |
| } |
| #endif |
| loc--; |
| if (quotes) { |
| if (--esc < 0) { |
| esc = esclen(startp, loc); |
| } |
| if (esc % 2) { |
| esc--; |
| loc--; |
| } |
| } |
| } |
| return NULL; |
| } |
| |
| static void varunset(const char *, const char *, const char *, int) NORETURN; |
| static void |
| varunset(const char *end, const char *var, const char *umsg, int varflags) |
| { |
| const char *msg; |
| const char *tail; |
| |
| tail = nullstr; |
| msg = "parameter not set"; |
| if (umsg) { |
| if ((unsigned char)*end == CTLENDVAR) { |
| if (varflags & VSNUL) |
| tail = " or null"; |
| } else { |
| msg = umsg; |
| } |
| } |
| ash_msg_and_raise_error("%.*s: %s%s", (int)(end - var - 1), var, msg, tail); |
| } |
| |
| static const char * |
| subevalvar(char *p, char *varname, int strloc, int subtype, |
| int startloc, int varflags, int flag, struct strlist *var_str_list) |
| { |
| struct nodelist *saveargbackq = argbackq; |
| int quotes = flag & QUOTES_ESC; |
| char *startp; |
| char *loc; |
| char *rmesc, *rmescend; |
| char *str; |
| IF_BASH_SUBSTR(int pos, len, orig_len;) |
| int amount, resetloc; |
| IF_BASH_PATTERN_SUBST(int workloc;) |
| IF_BASH_PATTERN_SUBST(char *repl = NULL;) |
| int zero; |
| char *(*scan)(char*, char*, char*, char*, int, int); |
| |
| //bb_error_msg("subevalvar(p:'%s',varname:'%s',strloc:%d,subtype:%d,startloc:%d,varflags:%x,quotes:%d)", |
| // p, varname, strloc, subtype, startloc, varflags, quotes); |
| |
| argstr(p, EXP_TILDE | (subtype != VSASSIGN && subtype != VSQUESTION ? |
| (flag & (EXP_QUOTED | EXP_QPAT) ? EXP_QPAT : EXP_CASE) : 0), |
| var_str_list); |
| STPUTC('\0', expdest); |
| argbackq = saveargbackq; |
| startp = (char *)stackblock() + startloc; |
| |
| switch (subtype) { |
| case VSASSIGN: |
| setvar0(varname, startp); |
| amount = startp - expdest; |
| STADJUST(amount, expdest); |
| return startp; |
| |
| case VSQUESTION: |
| varunset(p, varname, startp, varflags); |
| /* NOTREACHED */ |
| |
| #if BASH_SUBSTR |
| case VSSUBSTR: |
| //TODO: support more general format ${v:EXPR:EXPR}, |
| // where EXPR follows $(()) rules |
| loc = str = stackblock() + strloc; |
| /* Read POS in ${var:POS:LEN} */ |
| pos = atoi(loc); /* number(loc) errors out on "1:4" */ |
| len = str - startp - 1; |
| |
| /* *loc != '\0', guaranteed by parser */ |
| if (quotes) { |
| char *ptr; |
| |
| /* Adjust the length by the number of escapes */ |
| for (ptr = startp; ptr < (str - 1); ptr++) { |
| if ((unsigned char)*ptr == CTLESC) { |
| len--; |
| ptr++; |
| } |
| } |
| } |
| orig_len = len; |
| |
| if (*loc++ == ':') { |
| /* ${var::LEN} */ |
| len = number(loc); |
| } else { |
| /* Skip POS in ${var:POS:LEN} */ |
| len = orig_len; |
| while (*loc && *loc != ':') { |
| /* TODO? |
| * bash complains on: var=qwe; echo ${var:1a:123} |
| if (!isdigit(*loc)) |
| ash_msg_and_raise_error(msg_illnum, str); |
| */ |
| loc++; |
| } |
| if (*loc++ == ':') { |
| len = number(loc); |
| } |
| } |
| if (pos < 0) { |
| /* ${VAR:$((-n)):l} starts n chars from the end */ |
| pos = orig_len + pos; |
| } |
| if ((unsigned)pos >= orig_len) { |
| /* apart from obvious ${VAR:999999:l}, |
| * covers ${VAR:$((-9999999)):l} - result is "" |
| * (bash-compat) |
| */ |
| pos = 0; |
| len = 0; |
| } |
| if (len > (orig_len - pos)) |
| len = orig_len - pos; |
| |
| for (str = startp; pos; str++, pos--) { |
| if (quotes && (unsigned char)*str == CTLESC) |
| str++; |
| } |
| for (loc = startp; len; len--) { |
| if (quotes && (unsigned char)*str == CTLESC) |
| *loc++ = *str++; |
| *loc++ = *str++; |
| } |
| *loc = '\0'; |
| amount = loc - expdest; |
| STADJUST(amount, expdest); |
| return loc; |
| #endif /* BASH_SUBSTR */ |
| } |
| |
| resetloc = expdest - (char *)stackblock(); |
| |
| #if BASH_PATTERN_SUBST |
| /* We'll comeback here if we grow the stack while handling |
| * a VSREPLACE or VSREPLACEALL, since our pointers into the |
| * stack will need rebasing, and we'll need to remove our work |
| * areas each time |
| */ |
| restart: |
| #endif |
| |
| amount = expdest - ((char *)stackblock() + resetloc); |
| STADJUST(-amount, expdest); |
| startp = (char *)stackblock() + startloc; |
| |
| rmesc = startp; |
| rmescend = (char *)stackblock() + strloc; |
| if (quotes) { |
| rmesc = rmescapes(startp, RMESCAPE_ALLOC | RMESCAPE_GROW); |
| if (rmesc != startp) { |
| rmescend = expdest; |
| startp = (char *)stackblock() + startloc; |
| } |
| } |
| rmescend--; |
| str = (char *)stackblock() + strloc; |
| /* |
| * Example: v='a\bc'; echo ${v/\\b/_\\_\z_} |
| * The result is a_\_z_c (not a\_\_z_c)! |
| * |
| * The search pattern and replace string treat backslashes differently! |
| * RMESCAPE_SLASH causes preglob to work differently on the pattern |
| * and string. It's only used on the first call. |
| */ |
| preglob(str, IF_BASH_PATTERN_SUBST( |
| (subtype == VSREPLACE || subtype == VSREPLACEALL) && !repl ? |
| RMESCAPE_SLASH : ) 0); |
| |
| #if BASH_PATTERN_SUBST |
| workloc = expdest - (char *)stackblock(); |
| if (subtype == VSREPLACE || subtype == VSREPLACEALL) { |
| char *idx, *end; |
| |
| if (!repl) { |
| repl = strchr(str, CTLESC); |
| if (repl) |
| *repl++ = '\0'; |
| else |
| repl = nullstr; |
| } |
| //bb_error_msg("str:'%s' repl:'%s'", str, repl); |
| |
| /* If there's no pattern to match, return the expansion unmolested */ |
| if (str[0] == '\0') |
| return NULL; |
| |
| len = 0; |
| idx = startp; |
| end = str - 1; |
| while (idx < end) { |
| try_to_match: |
| loc = scanright(idx, rmesc, rmescend, str, quotes, 1); |
| //bb_error_msg("scanright('%s'):'%s'", str, loc); |
| if (!loc) { |
| /* No match, advance */ |
| char *restart_detect = stackblock(); |
| skip_matching: |
| STPUTC(*idx, expdest); |
| if (quotes && (unsigned char)*idx == CTLESC) { |
| idx++; |
| len++; |
| STPUTC(*idx, expdest); |
| } |
| if (stackblock() != restart_detect) |
| goto restart; |
| idx++; |
| len++; |
| rmesc++; |
| /* continue; - prone to quadratic behavior, smarter code: */ |
| if (idx >= end) |
| break; |
| if (str[0] == '*') { |
| /* Pattern is "*foo". If "*foo" does not match "long_string", |
| * it would never match "ong_string" etc, no point in trying. |
| */ |
| goto skip_matching; |
| } |
| goto try_to_match; |
| } |
| |
| if (subtype == VSREPLACEALL) { |
| while (idx < loc) { |
| if (quotes && (unsigned char)*idx == CTLESC) |
| idx++; |
| idx++; |
| rmesc++; |
| } |
| } else { |
| idx = loc; |
| } |
| |
| //bb_error_msg("repl:'%s'", repl); |
| for (loc = (char*)repl; *loc; loc++) { |
| char *restart_detect = stackblock(); |
| if (quotes && *loc == '\\') { |
| STPUTC(CTLESC, expdest); |
| len++; |
| } |
| STPUTC(*loc, expdest); |
| if (stackblock() != restart_detect) |
| goto restart; |
| len++; |
| } |
| |
| if (subtype == VSREPLACE) { |
| //bb_error_msg("tail:'%s', quotes:%x", idx, quotes); |
| while (*idx) { |
| char *restart_detect = stackblock(); |
| STPUTC(*idx, expdest); |
| if (stackblock() != restart_detect) |
| goto restart; |
| len++; |
| idx++; |
| } |
| break; |
| } |
| } |
| |
| /* We've put the replaced text into a buffer at workloc, now |
| * move it to the right place and adjust the stack. |
| */ |
| STPUTC('\0', expdest); |
| startp = (char *)stackblock() + startloc; |
| memmove(startp, (char *)stackblock() + workloc, len + 1); |
| //bb_error_msg("startp:'%s'", startp); |
| amount = expdest - (startp + len); |
| STADJUST(-amount, expdest); |
| return startp; |
| } |
| #endif /* BASH_PATTERN_SUBST */ |
| |
| subtype -= VSTRIMRIGHT; |
| #if DEBUG |
| if (subtype < 0 || subtype > 7) |
| abort(); |
| #endif |
| /* zero = (subtype == VSTRIMLEFT || subtype == VSTRIMLEFTMAX) */ |
| zero = subtype >> 1; |
| /* VSTRIMLEFT/VSTRIMRIGHTMAX -> scanleft */ |
| scan = (subtype & 1) ^ zero ? scanleft : scanright; |
| |
| loc = scan(startp, rmesc, rmescend, str, quotes, zero); |
| if (loc) { |
| if (zero) { |
| memmove(startp, loc, str - loc); |
| loc = startp + (str - loc) - 1; |
| } |
| *loc = '\0'; |
| amount = loc - expdest; |
| STADJUST(amount, expdest); |
| } |
| return loc; |
| } |
| |
| /* |
| * Add the value of a specialized variable to the stack string. |
| * name parameter (examples): |
| * ash -c 'echo $1' name:'1=' |
| * ash -c 'echo $qwe' name:'qwe=' |
| * ash -c 'echo $$' name:'$=' |
| * ash -c 'echo ${$}' name:'$=' |
| * ash -c 'echo ${$##q}' name:'$=q' |
| * ash -c 'echo ${#$}' name:'$=' |
| * note: examples with bad shell syntax: |
| * ash -c 'echo ${#$1}' name:'$=1' |
| * ash -c 'echo ${#1#}' name:'1=#' |
| */ |
| static NOINLINE ssize_t |
| varvalue(char *name, int varflags, int flags, struct strlist *var_str_list, int *quotedp) |
| { |
| const char *p; |
| int num; |
| int i; |
| ssize_t len = 0; |
| int sep; |
| int quoted = *quotedp; |
| int subtype = varflags & VSTYPE; |
| int discard = subtype == VSPLUS || subtype == VSLENGTH; |
| int quotes = (discard ? 0 : (flags & QUOTES_ESC)) | QUOTES_KEEPNUL; |
| int syntax; |
| |
| sep = (flags & EXP_FULL) << CHAR_BIT; |
| syntax = quoted ? DQSYNTAX : BASESYNTAX; |
| |
| switch (*name) { |
| case '$': |
| num = rootpid; |
| goto numvar; |
| case '?': |
| num = exitstatus; |
| goto numvar; |
| case '#': |
| num = shellparam.nparam; |
| goto numvar; |
| case '!': |
| num = backgndpid; |
| if (num == 0) |
| return -1; |
| numvar: |
| len = cvtnum(num); |
| goto check_1char_name; |
| case '-': |
| expdest = makestrspace(NOPTS, expdest); |
| for (i = NOPTS - 1; i >= 0; i--) { |
| if (optlist[i]) { |
| USTPUTC(optletters(i), expdest); |
| len++; |
| } |
| } |
| check_1char_name: |
| #if 0 |
| /* handles cases similar to ${#$1} */ |
| if (name[2] != '\0') |
| raise_error_syntax("bad substitution"); |
| #endif |
| break; |
| case '@': |
| if (quoted && sep) |
| goto param; |
| /* fall through */ |
| case '*': { |
| char **ap; |
| char sepc; |
| |
| if (quoted) |
| sep = 0; |
| sep |= ifsset() ? ifsval()[0] : ' '; |
| param: |
| sepc = sep; |
| *quotedp = !sepc; |
| ap = shellparam.p; |
| if (!ap) |
| return -1; |
| while ((p = *ap++) != NULL) { |
| len += strtodest(p, syntax, quotes); |
| |
| if (*ap && sep) { |
| len++; |
| memtodest(&sepc, 1, syntax, quotes); |
| } |
| } |
| break; |
| } /* case '*' */ |
| case '0': |
| case '1': |
| case '2': |
| case '3': |
| case '4': |
| case '5': |
| case '6': |
| case '7': |
| case '8': |
| case '9': |
| num = atoi(name); /* number(name) fails on ${N#str} etc */ |
| if (num < 0 || num > shellparam.nparam) |
| return -1; |
| p = num ? shellparam.p[num - 1] : arg0; |
| goto value; |
| default: |
| /* NB: name has form "VAR=..." */ |
| |
| /* "A=a B=$A" case: var_str_list is a list of "A=a" strings |
| * which should be considered before we check variables. */ |
| if (var_str_list) { |
| unsigned name_len = (strchrnul(name, '=') - name) + 1; |
| p = NULL; |
| do { |
| char *str, *eq; |
| str = var_str_list->text; |
| eq = strchr(str, '='); |
| if (!eq) /* stop at first non-assignment */ |
| break; |
| eq++; |
| if (name_len == (unsigned)(eq - str) |
| && strncmp(str, name, name_len) == 0 |
| ) { |
| p = eq; |
| /* goto value; - WRONG! */ |
| /* think "A=1 A=2 B=$A" */ |
| } |
| var_str_list = var_str_list->next; |
| } while (var_str_list); |
| if (p) |
| goto value; |
| } |
| p = lookupvar(name); |
| value: |
| if (!p) |
| return -1; |
| |
| len = strtodest(p, syntax, quotes); |
| #if ENABLE_UNICODE_SUPPORT |
| if (subtype == VSLENGTH && len > 0) { |
| reinit_unicode_for_ash(); |
| if (unicode_status == UNICODE_ON) { |
| STADJUST(-len, expdest); |
| discard = 0; |
| len = unicode_strlen(p); |
| } |
| } |
| #endif |
| break; |
| } |
| |
| if (discard) |
| STADJUST(-len, expdest); |
| return len; |
| } |
| |
| /* |
| * Expand a variable, and return a pointer to the next character in the |
| * input string. |
| */ |
| static char * |
| evalvar(char *p, int flag, struct strlist *var_str_list) |
| { |
| char varflags; |
| char subtype; |
| int quoted; |
| char easy; |
| char *var; |
| int patloc; |
| int startloc; |
| ssize_t varlen; |
| |
| varflags = (unsigned char) *p++; |
| subtype = varflags & VSTYPE; |
| |
| if (!subtype) |
| raise_error_syntax("bad substitution"); |
| |
| quoted = flag & EXP_QUOTED; |
| var = p; |
| easy = (!quoted || (*var == '@' && shellparam.nparam)); |
| startloc = expdest - (char *)stackblock(); |
| p = strchr(p, '=') + 1; //TODO: use var_end(p)? |
| |
| again: |
| varlen = varvalue(var, varflags, flag, var_str_list, "ed); |
| if (varflags & VSNUL) |
| varlen--; |
| |
| if (subtype == VSPLUS) { |
| varlen = -1 - varlen; |
| goto vsplus; |
| } |
| |
| if (subtype == VSMINUS) { |
| vsplus: |
| if (varlen < 0) { |
| argstr( |
| p, |
| flag | EXP_TILDE | EXP_WORD, |
| var_str_list |
| ); |
| goto end; |
| } |
| goto record; |
| } |
| |
| if (subtype == VSASSIGN || subtype == VSQUESTION) { |
| if (varlen >= 0) |
| goto record; |
| |
| subevalvar(p, var, 0, subtype, startloc, varflags, |
| flag & ~QUOTES_ESC, var_str_list); |
| varflags &= ~VSNUL; |
| /* |
| * Remove any recorded regions beyond |
| * start of variable |
| */ |
| removerecordregions(startloc); |
| goto again; |
| } |
| |
| if (varlen < 0 && uflag) |
| varunset(p, var, 0, 0); |
| |
| if (subtype == VSLENGTH) { |
| cvtnum(varlen > 0 ? varlen : 0); |
| goto record; |
| } |
| |
| if (subtype == VSNORMAL) { |
| record: |
| if (!easy) |
| goto end; |
| recordregion(startloc, expdest - (char *)stackblock(), quoted); |
| goto end; |
| } |
| |
| #if DEBUG |
| switch (subtype) { |
| case VSTRIMLEFT: |
| case VSTRIMLEFTMAX: |
| case VSTRIMRIGHT: |
| case VSTRIMRIGHTMAX: |
| #if BASH_SUBSTR |
| case VSSUBSTR: |
| #endif |
| #if BASH_PATTERN_SUBST |
| case VSREPLACE: |
| case VSREPLACEALL: |
| #endif |
| break; |
| default: |
| abort(); |
| } |
| #endif |
| |
| if (varlen >= 0) { |
| /* |
| * Terminate the string and start recording the pattern |
| * right after it |
| */ |
| STPUTC('\0', expdest); |
| patloc = expdest - (char *)stackblock(); |
| if (NULL == subevalvar(p, /* varname: */ NULL, patloc, subtype, |
| startloc, varflags, flag, var_str_list)) { |
| int amount = expdest - ( |
| (char *)stackblock() + patloc - 1 |
| ); |
| STADJUST(-amount, expdest); |
| } |
| /* Remove any recorded regions beyond start of variable */ |
| removerecordregions(startloc); |
| goto record; |
| } |
| |
| end: |
| if (subtype != VSNORMAL) { /* skip to end of alternative */ |
| int nesting = 1; |
| for (;;) { |
| unsigned char c = *p++; |
| if (c == CTLESC) |
| p++; |
| else if (c == CTLBACKQ) { |
| if (varlen >= 0) |
| argbackq = argbackq->next; |
| } else if (c == CTLVAR) { |
| if ((*p++ & VSTYPE) != VSNORMAL) |
| nesting++; |
| } else if (c == CTLENDVAR) { |
| if (--nesting == 0) |
| break; |
| } |
| } |
| } |
| return p; |
| } |
| |
| /* |
| * Add a file name to the list. |
| */ |
| static void |
| addfname(const char *name) |
| { |
| struct strlist *sp; |
| |
| sp = stzalloc(sizeof(*sp)); |
| sp->text = sstrdup(name); |
| *exparg.lastp = sp; |
| exparg.lastp = &sp->next; |
| } |
| |
| /* Avoid glob() (and thus, stat() et al) for words like "echo" */ |
| static int |
| hasmeta(const char *p) |
| { |
| static const char chars[] ALIGN1 = { |
| '*', '?', '[', '\\', CTLQUOTEMARK, CTLESC, 0 |
| }; |
| |
| for (;;) { |
| p = strpbrk(p, chars); |
| if (!p) |
| break; |
| switch ((unsigned char) *p) { |
| case CTLQUOTEMARK: |
| for (;;) { |
| p++; |
| if (*p == CTLQUOTEMARK) |
| break; |
| if (*p == CTLESC) |
| p++; |
| if (*p == '\0') /* huh? */ |
| return 0; |
| } |
| break; |
| case '\\': |
| case CTLESC: |
| p++; |
| if (*p == '\0') |
| return 0; |
| break; |
| case '[': |
| if (!strchr(p + 1, ']')) { |
| /* It's not a properly closed [] pattern, |
| * but other metas may follow. Continue checking. |
| * my[file* _is_ globbed by bash |
| * and matches filenames like "my[file1". |
| */ |
| break; |
| } |
| /* fallthrough */ |
| default: |
| /* case '*': */ |
| /* case '?': */ |
| return 1; |
| } |
| p++; |
| } |
| |
| return 0; |
| } |
| |
| /* If we want to use glob() from libc... */ |
| #if !ENABLE_ASH_INTERNAL_GLOB |
| |
| /* Add the result of glob() to the list */ |
| static void |
| addglob(const glob_t *pglob) |
| { |
| char **p = pglob->gl_pathv; |
| |
| do { |
| addfname(*p); |
| } while (*++p); |
| } |
| static void |
| expandmeta(struct strlist *str /*, int flag*/) |
| { |
| /* TODO - EXP_REDIR */ |
| |
| while (str) { |
| char *p; |
| glob_t pglob; |
| int i; |
| |
| if (fflag) |
| goto nometa; |
| |
| if (!hasmeta(str->text)) |
| goto nometa; |
| |
| INT_OFF; |
| p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP); |
| // GLOB_NOMAGIC (GNU): if no *?[ chars in pattern, return it even if no match |
| // GLOB_NOCHECK: if no match, return unchanged pattern (sans \* escapes?) |
| // |
| // glibc 2.24.90 glob(GLOB_NOMAGIC) does not remove backslashes used for escaping: |
| // if you pass it "file\?", it returns "file\?", not "file?", if no match. |
| // Which means you need to unescape the string, right? Not so fast: |
| // if there _is_ a file named "file\?" (with backslash), it is returned |
| // as "file\?" too (whichever pattern you used to find it, say, "file*"). |
| // You DON'T KNOW by looking at the result whether you need to unescape it. |
| // |
| // Worse, globbing of "file\?" in a directory with two files, "file?" and "file\?", |
| // returns "file\?" - which is WRONG: "file\?" pattern matches "file?" file. |
| // Without GLOB_NOMAGIC, this works correctly ("file?" is returned as a match). |
| // With GLOB_NOMAGIC | GLOB_NOCHECK, this also works correctly. |
| // i = glob(p, GLOB_NOMAGIC | GLOB_NOCHECK, NULL, &pglob); |
| // i = glob(p, GLOB_NOMAGIC, NULL, &pglob); |
| i = glob(p, 0, NULL, &pglob); |
| //bb_error_msg("glob('%s'):%d '%s'...", p, i, pglob.gl_pathv ? pglob.gl_pathv[0] : "-"); |
| if (p != str->text) |
| free(p); |
| switch (i) { |
| case 0: |
| #if 0 // glibc 2.24.90 bug? Patterns like "*/file", when match, don't set GLOB_MAGCHAR |
| /* GLOB_MAGCHAR is set if *?[ chars were seen (GNU) */ |
| if (!(pglob.gl_flags & GLOB_MAGCHAR)) |
| goto nometa2; |
| #endif |
| addglob(&pglob); |
| globfree(&pglob); |
| INT_ON; |
| break; |
| case GLOB_NOMATCH: |
| //nometa2: |
| globfree(&pglob); |
| INT_ON; |
| nometa: |
| *exparg.lastp = str; |
| rmescapes(str->text, 0); |
| exparg.lastp = &str->next; |
| break; |
| default: /* GLOB_NOSPACE */ |
| globfree(&pglob); |
| INT_ON; |
| ash_msg_and_raise_error(bb_msg_memory_exhausted); |
| } |
| str = str->next; |
| } |
| } |
| |
| #else |
| /* ENABLE_ASH_INTERNAL_GLOB: Homegrown globbing code. (dash also has both, uses homegrown one.) */ |
| |
| /* |
| * Do metacharacter (i.e. *, ?, [...]) expansion. |
| */ |
| static void |
| expmeta(char *expdir, char *enddir, char *name) |
| { |
| char *p; |
| const char *cp; |
| char *start; |
| char *endname; |
| int metaflag; |
| struct stat statb; |
| DIR *dirp; |
| struct dirent *dp; |
| int atend; |
| int matchdot; |
| int esc; |
| |
| metaflag = 0; |
| start = name; |
| for (p = name; esc = 0, *p; p += esc + 1) { |
| if (*p == '*' || *p == '?') |
| metaflag = 1; |
| else if (*p == '[') { |
| char *q = p + 1; |
| if (*q == '!') |
| q++; |
| for (;;) { |
| if (*q == '\\') |
| q++; |
| if (*q == '/' || *q == '\0') |
| break; |
| if (*++q == ']') { |
| metaflag = 1; |
| break; |
| } |
| } |
| } else { |
| if (*p == '\\') |
| esc++; |
| if (p[esc] == '/') { |
| if (metaflag) |
| break; |
| start = p + esc + 1; |
| } |
| } |
| } |
| if (metaflag == 0) { /* we've reached the end of the file name */ |
| if (enddir != expdir) |
| metaflag++; |
| p = name; |
| do { |
| if (*p == '\\') |
| p++; |
| *enddir++ = *p; |
| } while (*p++); |
| if (metaflag == 0 || lstat(expdir, &statb) >= 0) |
| addfname(expdir); |
| return; |
| } |
| endname = p; |
| if (name < start) { |
| p = name; |
| do { |
| if (*p == '\\') |
| p++; |
| *enddir++ = *p++; |
| } while (p < start); |
| } |
| if (enddir == expdir) { |
| cp = "."; |
| } else if (enddir == expdir + 1 && *expdir == '/') { |
| cp = "/"; |
| } else { |
| cp = expdir; |
| enddir[-1] = '\0'; |
| } |
| dirp = opendir(cp); |
| if (dirp == NULL) |
| return; |
| if (enddir != expdir) |
| enddir[-1] = '/'; |
| if (*endname == 0) { |
| atend = 1; |
| } else { |
| atend = 0; |
| *endname = '\0'; |
| endname += esc + 1; |
| } |
| matchdot = 0; |
| p = start; |
| if (*p == '\\') |
| p++; |
| if (*p == '.') |
| matchdot++; |
| while (!pending_int && (dp = readdir(dirp)) != NULL) { |
| if (dp->d_name[0] == '.' && !matchdot) |
| continue; |
| if (pmatch(start, dp->d_name)) { |
| if (atend) { |
| strcpy(enddir, dp->d_name); |
| addfname(expdir); |
| } else { |
| for (p = enddir, cp = dp->d_name; (*p++ = *cp++) != '\0';) |
| continue; |
| p[-1] = '/'; |
| expmeta(expdir, p, endname); |
| } |
| } |
| } |
| closedir(dirp); |
| if (!atend) |
| endname[-esc - 1] = esc ? '\\' : '/'; |
| } |
| |
| static struct strlist * |
| msort(struct strlist *list, int len) |
| { |
| struct strlist *p, *q = NULL; |
| struct strlist **lpp; |
| int half; |
| int n; |
| |
| if (len <= 1) |
| return list; |
| half = len >> 1; |
| p = list; |
| for (n = half; --n >= 0;) { |
| q = p; |
| p = p->next; |
| } |
| q->next = NULL; /* terminate first half of list */ |
| q = msort(list, half); /* sort first half of list */ |
| p = msort(p, len - half); /* sort second half */ |
| lpp = &list; |
| for (;;) { |
| #if ENABLE_LOCALE_SUPPORT |
| if (strcoll(p->text, q->text) < 0) |
| #else |
| if (strcmp(p->text, q->text) < 0) |
| #endif |
| { |
| *lpp = p; |
| lpp = &p->next; |
| p = *lpp; |
| if (p == NULL) { |
| *lpp = q; |
| break; |
| } |
| } else { |
| *lpp = q; |
| lpp = &q->next; |
| q = *lpp; |
| if (q == NULL) { |
| *lpp = p; |
| break; |
| } |
| } |
| } |
| return list; |
| } |
| |
| /* |
| * Sort the results of file name expansion. It calculates the number of |
| * strings to sort and then calls msort (short for merge sort) to do the |
| * work. |
| */ |
| static struct strlist * |
| expsort(struct strlist *str) |
| { |
| int len; |
| struct strlist *sp; |
| |
| len = 0; |
| for (sp = str; sp; sp = sp->next) |
| len++; |
| return msort(str, len); |
| } |
| |
| static void |
| expandmeta(struct strlist *str /*, int flag*/) |
| { |
| /* TODO - EXP_REDIR */ |
| |
| while (str) { |
| char *expdir; |
| struct strlist **savelastp; |
| struct strlist *sp; |
| char *p; |
| |
| if (fflag) |
| goto nometa; |
| if (!hasmeta(str->text)) |
| goto nometa; |
| savelastp = exparg.lastp; |
| |
| INT_OFF; |
| p = preglob(str->text, RMESCAPE_ALLOC | RMESCAPE_HEAP); |
| { |
| int i = strlen(str->text); |
| //BUGGY estimation of how long expanded name can be |
| expdir = ckmalloc(i < 2048 ? 2048 : i+1); |
| } |
| expmeta(expdir, expdir, p); |
| free(expdir); |
| if (p != str->text) |
| free(p); |
| INT_ON; |
| if (exparg.lastp == savelastp) { |
| /* |
| * no matches |
| */ |
| nometa: |
| *exparg.lastp = str; |
| rmescapes(str->text, 0); |
| exparg.lastp = &str->next; |
| } else { |
| *exparg.lastp = NULL; |
| *savelastp = sp = expsort(*savelastp); |
| while (sp->next != NULL) |
| sp = sp->next; |
| exparg.lastp = &sp->next; |
| } |
| str = str->next; |
| } |
| } |
| #endif /* ENABLE_ASH_INTERNAL_GLOB */ |
| |
| /* |
| * Perform variable substitution and command substitution on an argument, |
| * placing the resulting list of arguments in arglist. If EXP_FULL is true, |
| * perform splitting and file name expansion. When arglist is NULL, perform |
| * here document expansion. |
| */ |
| static void |
| expandarg(union node *arg, struct arglist *arglist, int flag) |
| { |
| struct strlist *sp; |
| char *p; |
| |
| argbackq = arg->narg.backquote; |
| STARTSTACKSTR(expdest); |
| TRACE(("expandarg: argstr('%s',flags:%x)\n", arg->narg.text, flag)); |
| argstr(arg->narg.text, flag, |
| /* var_str_list: */ arglist ? arglist->list : NULL); |
| p = _STPUTC('\0', expdest); |
| expdest = p - 1; |
| if (arglist == NULL) { |
| /* here document expanded */ |
| goto out; |
| } |
| p = grabstackstr(p); |
| TRACE(("expandarg: p:'%s'\n", p)); |
| exparg.lastp = &exparg.list; |
| /* |
| * TODO - EXP_REDIR |
| */ |
| if (flag & EXP_FULL) { |
| ifsbreakup(p, &exparg); |
| *exparg.lastp = NULL; |
| exparg.lastp = &exparg.list; |
| expandmeta(exparg.list /*, flag*/); |
| } else { |
| if (flag & EXP_REDIR) { /*XXX - for now, just remove escapes */ |
| rmescapes(p, 0); |
| TRACE(("expandarg: rmescapes:'%s'\n", p)); |
| } |
| sp = stzalloc(sizeof(*sp)); |
| sp->text = p; |
| *exparg.lastp = sp; |
| exparg.lastp = &sp->next; |
| } |
| *exparg.lastp = NULL; |
| if (exparg.list) { |
| *arglist->lastp = exparg.list; |
| arglist->lastp = exparg.lastp; |
| } |
| |
| out: |
| ifsfree(); |
| } |
| |
| /* |
| * Expand shell variables and backquotes inside a here document. |
| */ |
| static void |
| expandhere(union node *arg, int fd) |
| { |
| expandarg(arg, (struct arglist *)NULL, EXP_QUOTED); |
| full_write(fd, stackblock(), expdest - (char *)stackblock()); |
| } |
| |
| /* |
| * Returns true if the pattern matches the string. |
| */ |
| static int |
| patmatch(char *pattern, const char *string) |
| { |
| return pmatch(preglob(pattern, 0), string); |
| } |
| |
| /* |
| * See if a pattern matches in a case statement. |
| */ |
| static int |
| casematch(union node *pattern, char *val) |
| { |
| struct stackmark smark; |
| int result; |
| |
| setstackmark(&smark); |
| argbackq = pattern->narg.backquote; |
| STARTSTACKSTR(expdest); |
| argstr(pattern->narg.text, EXP_TILDE | EXP_CASE, |
| /* var_str_list: */ NULL); |
| STACKSTRNUL(expdest); |
| ifsfree(); |
| result = patmatch(stackblock(), val); |
| popstackmark(&smark); |
| return result; |
| } |
| |
| |
| /* ============ find_command */ |
| |
| struct builtincmd { |
| const char *name; |
| int (*builtin)(int, char **) FAST_FUNC; |
| /* unsigned flags; */ |
| }; |
| #define IS_BUILTIN_SPECIAL(b) ((b)->name[0] & 1) |
| /* "regular" builtins always take precedence over commands, |
| * regardless of PATH=....%builtin... position */ |
| #define IS_BUILTIN_REGULAR(b) ((b)->name[0] & 2) |
| #define IS_BUILTIN_ASSIGN(b) ((b)->name[0] & 4) |
| |
| struct cmdentry { |
| smallint cmdtype; /* CMDxxx */ |
| union param { |
| int index; |
| /* index >= 0 for commands without path (slashes) */ |
| /* (TODO: what exactly does the value mean? PATH position?) */ |
| /* index == -1 for commands with slashes */ |
| /* index == (-2 - applet_no) for NOFORK applets */ |
| const struct builtincmd *cmd; |
| struct funcnode *func; |
| } u; |
| }; |
| /* values of cmdtype */ |
| #define CMDUNKNOWN -1 /* no entry in table for command */ |
| #define CMDNORMAL 0 /* command is an executable program */ |
| #define CMDFUNCTION 1 /* command is a shell function */ |
| #define CMDBUILTIN 2 /* command is a shell builtin */ |
| |
| /* action to find_command() */ |
| #define DO_ERR 0x01 /* prints errors */ |
| #define DO_ABS 0x02 /* checks absolute paths */ |
| #define DO_NOFUNC 0x04 /* don't return shell functions, for command */ |
| #define DO_ALTPATH 0x08 /* using alternate path */ |
| #define DO_ALTBLTIN 0x20 /* %builtin in alt. path */ |
| |
| static void find_command(char *, struct cmdentry *, int, const char *); |
| |
| |
| /* ============ Hashing commands */ |
| |
| /* |
| * When commands are first encountered, they are entered in a hash table. |
| * This ensures that a full path search will not have to be done for them |
| * on each invocation. |
| * |
| * We should investigate converting to a linear search, even though that |
| * would make the command name "hash" a misnomer. |
| */ |
| |
| struct tblentry { |
| struct tblentry *next; /* next entry in hash chain */ |
| union param param; /* definition of builtin function */ |
| smallint cmdtype; /* CMDxxx */ |
| char rehash; /* if set, cd done since entry created */ |
| char cmdname[1]; /* name of command */ |
| }; |
| |
| static struct tblentry **cmdtable; |
| #define INIT_G_cmdtable() do { \ |
| cmdtable = xzalloc(CMDTABLESIZE * sizeof(cmdtable[0])); \ |
| } while (0) |
| |
| static int builtinloc = -1; /* index in path of %builtin, or -1 */ |
| |
| |
| static void |
| tryexec(IF_FEATURE_SH_STANDALONE(int applet_no,) char *cmd, char **argv, char **envp) |
| { |
| #if ENABLE_FEATURE_SH_STANDALONE |
| if (applet_no >= 0) { |
| if (APPLET_IS_NOEXEC(applet_no)) { |
| clearenv(); |
| while (*envp) |
| putenv(*envp++); |
| run_applet_no_and_exit(applet_no, argv); |
| } |
| /* re-exec ourselves with the new arguments */ |
| execve(bb_busybox_exec_path, argv, envp); |
| /* If they called chroot or otherwise made the binary no longer |
| * executable, fall through */ |
| } |
| #endif |
| |
| repeat: |
| #ifdef SYSV |
| do { |
| execve(cmd, argv, envp); |
| } while (errno == EINTR); |
| #else |
| execve(cmd, argv, envp); |
| #endif |
| if (cmd != (char*) bb_busybox_exec_path && errno == ENOEXEC) { |
| /* Run "cmd" as a shell script: |
| * http://pubs.opengroup.org/onlinepubs/9699919799/utilities/V3_chap02.html |
| * "If the execve() function fails with ENOEXEC, the shell |
| * shall execute a command equivalent to having a shell invoked |
| * with the command name as its first operand, |
| * with any remaining arguments passed to the new shell" |
| * |
| * That is, do not use $SHELL, user's shell, or /bin/sh; |
| * just call ourselves. |
| * |
| * Note that bash reads ~80 chars of the file, and if it sees |
| * a zero byte before it sees newline, it doesn't try to |
| * interpret it, but fails with "cannot execute binary file" |
| * message and exit code 126. For one, this prevents attempts |
| * to interpret foreign ELF binaries as shell scripts. |
| */ |
| argv[0] = cmd; |
| cmd = (char*) bb_busybox_exec_path; |
| /* NB: this is only possible because all callers of shellexec() |
| * ensure that the argv[-1] slot exists! |
| */ |
| argv--; |
| argv[0] = (char*) "ash"; |
| goto repeat; |
| } |
| } |
| |
| /* |
| * Exec a program. Never returns. If you change this routine, you may |
| * have to change the find_command routine as well. |
| * argv[-1] must exist and be writable! See tryexec() for why. |
| */ |
| static void shellexec(char *prog, char **argv, const char *path, int idx) NORETURN; |
| static void shellexec(char *prog, char **argv, const char *path, int idx) |
| { |
| char *cmdname; |
| int e; |
| char **envp; |
| int exerrno; |
| int applet_no = -1; /* used only by FEATURE_SH_STANDALONE */ |
| |
| envp = listvars(VEXPORT, VUNSET, /*end:*/ NULL); |
| if (strchr(prog, '/') != NULL |
| #if ENABLE_FEATURE_SH_STANDALONE |
| || (applet_no = find_applet_by_name(prog)) >= 0 |
| #endif |
| ) { |
| tryexec(IF_FEATURE_SH_STANDALONE(applet_no,) prog, argv, envp); |
| if (applet_no >= 0) { |
| /* We tried execing ourself, but it didn't work. |
| * Maybe /proc/self/exe doesn't exist? |
| * Try $PATH search. |
| */ |
| goto try_PATH; |
| } |
| e = errno; |
| } else { |
| try_PATH: |
| e = ENOENT; |
| while ((cmdname = path_advance(&path, prog)) != NULL) { |
| if (--idx < 0 && pathopt == NULL) { |
| tryexec(IF_FEATURE_SH_STANDALONE(-1,) cmdname, argv, envp); |
| if (errno != ENOENT && errno != ENOTDIR) |
| e = errno; |
| } |
| stunalloc(cmdname); |
| } |
| } |
| |
| /* Map to POSIX errors */ |
| switch (e) { |
| case EACCES: |
| exerrno = 126; |
| break; |
| case ENOENT: |
| exerrno = 127; |
| break; |
| default: |
| exerrno = 2; |
| break; |
| } |
| exitstatus = exerrno; |
| TRACE(("shellexec failed for %s, errno %d, suppress_int %d\n", |
| prog, e, suppress_int)); |
| ash_msg_and_raise(EXEXIT, "%s: %s", prog, errmsg(e, "not found")); |
| /* NOTREACHED */ |
| } |
| |
| static void |
| printentry(struct tblentry *cmdp) |
| { |
| int idx; |
| const char *path; |
| char *name; |
| |
| idx = cmdp->param.index; |
| path = pathval(); |
| do { |
| name = path_advance(&path, cmdp->cmdname); |
| stunalloc(name); |
| } while (--idx >= 0); |
| out1fmt("%s%s\n", name, (cmdp->rehash ? "*" : nullstr)); |
| } |
| |
| /* |
| * Clear out command entries. The argument specifies the first entry in |
| * PATH which has changed. |
| */ |
| static void |
| clearcmdentry(int firstchange) |
| { |
| struct tblentry **tblp; |
| struct tblentry **pp; |
| struct tblentry *cmdp; |
| |
| INT_OFF; |
| for (tblp = cmdtable; tblp < &cmdtable[CMDTABLESIZE]; tblp++) { |
| pp = tblp; |
| while ((cmdp = *pp) != NULL) { |
| if ((cmdp->cmdtype == CMDNORMAL && |
| cmdp->param.index >= firstchange) |
| || (cmdp->cmdtype == CMDBUILTIN && |
| builtinloc >= firstchange) |
| ) { |
| *pp = cmdp->next; |
| free(cmdp); |
| } else { |
| pp = &cmdp->next; |
| } |
| } |
| } |
| INT_ON; |
| } |
| |
| /* |
| * Locate a command in the command hash table. If "add" is nonzero, |
| * add the command to the table if it is not already present. The |
| * variable "lastcmdentry" is set to point to the address of the link |
| * pointing to the entry, so that delete_cmd_entry can delete the |
| * entry. |
| * |
| * Interrupts must be off if called with add != 0. |
| */ |
| static struct tblentry **lastcmdentry; |
| |
| static struct tblentry * |
| cmdlookup(const char *name, int add) |
| { |
| unsigned int hashval; |
| const char *p; |
| struct tblentry *cmdp; |
| struct tblentry **pp; |
| |
| p = name; |
| hashval = (unsigned char)*p << 4; |
| while (*p) |
| hashval += (unsigned char)*p++; |
| hashval &= 0x7FFF; |
| pp = &cmdtable[hashval % CMDTABLESIZE]; |
| for (cmdp = *pp; cmdp; cmdp = cmdp->next) { |
| if (strcmp(cmdp->cmdname, name) == 0) |
| break; |
| pp = &cmdp->next; |
| } |
| if (add && cmdp == NULL) { |
| cmdp = *pp = ckzalloc(sizeof(struct tblentry) |
| + strlen(name) |
| /* + 1 - already done because |
| * tblentry::cmdname is char[1] */); |
| /*cmdp->next = NULL; - ckzalloc did it */ |
| cmdp->cmdtype = CMDUNKNOWN; |
| strcpy(cmdp->cmdname, name); |
| } |
| lastcmdentry = pp; |
| return cmdp; |
| } |
| |
| /* |
| * Delete the command entry returned on the last lookup. |
| */ |
| static void |
| delete_cmd_entry(void) |
| { |
| struct tblentry *cmdp; |
| |
| INT_OFF; |
| cmdp = *lastcmdentry; |
| *lastcmdentry = cmdp->next; |
| if (cmdp->cmdtype == CMDFUNCTION) |
| freefunc(cmdp->param.func); |
| free(cmdp); |
| INT_ON; |
| } |
| |
| /* |
| * Add a new command entry, replacing any existing command entry for |
| * the same name - except special builtins. |
| */ |
| static void |
| addcmdentry(char *name, struct cmdentry *entry) |
| { |
| struct tblentry *cmdp; |
| |
| cmdp = cmdlookup(name, 1); |
| if (cmdp->cmdtype == CMDFUNCTION) { |
| freefunc(cmdp->param.func); |
| } |
| cmdp->cmdtype = entry->cmdtype; |
| cmdp->param = entry->u; |
| cmdp->rehash = 0; |
| } |
| |
| static int FAST_FUNC |
| hashcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
| { |
| struct tblentry **pp; |
| struct tblentry *cmdp; |
| int c; |
| struct cmdentry entry; |
| char *name; |
| |
| if (nextopt("r") != '\0') { |
| clearcmdentry(0); |
| return 0; |
| } |
| |
| if (*argptr == NULL) { |
| for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) { |
| for (cmdp = *pp; cmdp; cmdp = cmdp->next) { |
| if (cmdp->cmdtype == CMDNORMAL) |
| printentry(cmdp); |
| } |
| } |
| return 0; |
| } |
| |
| c = 0; |
| while ((name = *argptr) != NULL) { |
| cmdp = cmdlookup(name, 0); |
| if (cmdp != NULL |
| && (cmdp->cmdtype == CMDNORMAL |
| || (cmdp->cmdtype == CMDBUILTIN && builtinloc >= 0)) |
| ) { |
| delete_cmd_entry(); |
| } |
| find_command(name, &entry, DO_ERR, pathval()); |
| if (entry.cmdtype == CMDUNKNOWN) |
| c = 1; |
| argptr++; |
| } |
| return c; |
| } |
| |
| /* |
| * Called when a cd is done. Marks all commands so the next time they |
| * are executed they will be rehashed. |
| */ |
| static void |
| hashcd(void) |
| { |
| struct tblentry **pp; |
| struct tblentry *cmdp; |
| |
| for (pp = cmdtable; pp < &cmdtable[CMDTABLESIZE]; pp++) { |
| for (cmdp = *pp; cmdp; cmdp = cmdp->next) { |
| if (cmdp->cmdtype == CMDNORMAL |
| || (cmdp->cmdtype == CMDBUILTIN |
| && !IS_BUILTIN_REGULAR(cmdp->param.cmd) |
| && builtinloc > 0) |
| ) { |
| cmdp->rehash = 1; |
| } |
| } |
| } |
| } |
| |
| /* |
| * Fix command hash table when PATH changed. |
| * Called before PATH is changed. The argument is the new value of PATH; |
| * pathval() still returns the old value at this point. |
| * Called with interrupts off. |
| */ |
| static void FAST_FUNC |
| changepath(const char *new) |
| { |
| const char *old; |
| int firstchange; |
| int idx; |
| int idx_bltin; |
| |
| old = pathval(); |
| firstchange = 9999; /* assume no change */ |
| idx = 0; |
| idx_bltin = -1; |
| for (;;) { |
| if (*old != *new) { |
| firstchange = idx; |
| if ((*old == '\0' && *new == ':') |
| || (*old == ':' && *new == '\0') |
| ) { |
| firstchange++; |
| } |
| old = new; /* ignore subsequent differences */ |
| } |
| if (*new == '\0') |
| break; |
| if (*new == '%' && idx_bltin < 0 && prefix(new + 1, "builtin")) |
| idx_bltin = idx; |
| if (*new == ':') |
| idx++; |
| new++; |
| old++; |
| } |
| if (builtinloc < 0 && idx_bltin >= 0) |
| builtinloc = idx_bltin; /* zap builtins */ |
| if (builtinloc >= 0 && idx_bltin < 0) |
| firstchange = 0; |
| clearcmdentry(firstchange); |
| builtinloc = idx_bltin; |
| } |
| enum { |
| TEOF, |
| TNL, |
| TREDIR, |
| TWORD, |
| TSEMI, |
| TBACKGND, |
| TAND, |
| TOR, |
| TPIPE, |
| TLP, |
| TRP, |
| TENDCASE, |
| TENDBQUOTE, |
| TNOT, |
| TCASE, |
| TDO, |
| TDONE, |
| TELIF, |
| TELSE, |
| TESAC, |
| TFI, |
| TFOR, |
| #if BASH_FUNCTION |
| TFUNCTION, |
| #endif |
| TIF, |
| TIN, |
| TTHEN, |
| TUNTIL, |
| TWHILE, |
| TBEGIN, |
| TEND |
| }; |
| typedef smallint token_id_t; |
| |
| /* Nth bit indicates if token marks the end of a list */ |
| enum { |
| tokendlist = 0 |
| /* 0 */ | (1u << TEOF) |
| /* 1 */ | (0u << TNL) |
| /* 2 */ | (0u << TREDIR) |
| /* 3 */ | (0u << TWORD) |
| /* 4 */ | (0u << TSEMI) |
| /* 5 */ | (0u << TBACKGND) |
| /* 6 */ | (0u << TAND) |
| /* 7 */ | (0u << TOR) |
| /* 8 */ | (0u << TPIPE) |
| /* 9 */ | (0u << TLP) |
| /* 10 */ | (1u << TRP) |
| /* 11 */ | (1u << TENDCASE) |
| /* 12 */ | (1u << TENDBQUOTE) |
| /* 13 */ | (0u << TNOT) |
| /* 14 */ | (0u << TCASE) |
| /* 15 */ | (1u << TDO) |
| /* 16 */ | (1u << TDONE) |
| /* 17 */ | (1u << TELIF) |
| /* 18 */ | (1u << TELSE) |
| /* 19 */ | (1u << TESAC) |
| /* 20 */ | (1u << TFI) |
| /* 21 */ | (0u << TFOR) |
| #if BASH_FUNCTION |
| /* 22 */ | (0u << TFUNCTION) |
| #endif |
| /* 23 */ | (0u << TIF) |
| /* 24 */ | (0u << TIN) |
| /* 25 */ | (1u << TTHEN) |
| /* 26 */ | (0u << TUNTIL) |
| /* 27 */ | (0u << TWHILE) |
| /* 28 */ | (0u << TBEGIN) |
| /* 29 */ | (1u << TEND) |
| , /* thus far 29 bits used */ |
| }; |
| |
| static const char *const tokname_array[] = { |
| "end of file", |
| "newline", |
| "redirection", |
| "word", |
| ";", |
| "&", |
| "&&", |
| "||", |
| "|", |
| "(", |
| ")", |
| ";;", |
| "`", |
| #define KWDOFFSET 13 |
| /* the following are keywords */ |
| "!", |
| "case", |
| "do", |
| "done", |
| "elif", |
| "else", |
| "esac", |
| "fi", |
| "for", |
| #if BASH_FUNCTION |
| "function", |
| #endif |
| "if", |
| "in", |
| "then", |
| "until", |
| "while", |
| "{", |
| "}", |
| }; |
| |
| /* Wrapper around strcmp for qsort/bsearch/... */ |
| static int |
| pstrcmp(const void *a, const void *b) |
| { |
| return strcmp((char*)a, *(char**)b); |
| } |
| |
| static const char *const * |
| findkwd(const char *s) |
| { |
| return bsearch(s, tokname_array + KWDOFFSET, |
| ARRAY_SIZE(tokname_array) - KWDOFFSET, |
| sizeof(tokname_array[0]), pstrcmp); |
| } |
| |
| /* |
| * Locate and print what a word is... |
| */ |
| static int |
| describe_command(char *command, const char *path, int describe_command_verbose) |
| { |
| struct cmdentry entry; |
| #if ENABLE_ASH_ALIAS |
| const struct alias *ap; |
| #endif |
| |
| path = path ? path : pathval(); |
| |
| if (describe_command_verbose) { |
| out1str(command); |
| } |
| |
| /* First look at the keywords */ |
| if (findkwd(command)) { |
| out1str(describe_command_verbose ? " is a shell keyword" : command); |
| goto out; |
| } |
| |
| #if ENABLE_ASH_ALIAS |
| /* Then look at the aliases */ |
| ap = lookupalias(command, 0); |
| if (ap != NULL) { |
| if (!describe_command_verbose) { |
| out1str("alias "); |
| printalias(ap); |
| return 0; |
| } |
| out1fmt(" is an alias for %s", ap->val); |
| goto out; |
| } |
| #endif |
| /* Brute force */ |
| find_command(command, &entry, DO_ABS, path); |
| |
| switch (entry.cmdtype) { |
| case CMDNORMAL: { |
| int j = entry.u.index; |
| char *p; |
| if (j < 0) { |
| p = command; |
| } else { |
| do { |
| p = path_advance(&path, command); |
| stunalloc(p); |
| } while (--j >= 0); |
| } |
| if (describe_command_verbose) { |
| out1fmt(" is %s", p); |
| } else { |
| out1str(p); |
| } |
| break; |
| } |
| |
| case CMDFUNCTION: |
| if (describe_command_verbose) { |
| out1str(" is a shell function"); |
| } else { |
| out1str(command); |
| } |
| break; |
| |
| case CMDBUILTIN: |
| if (describe_command_verbose) { |
| out1fmt(" is a %sshell builtin", |
| IS_BUILTIN_SPECIAL(entry.u.cmd) ? |
| "special " : nullstr |
| ); |
| } else { |
| out1str(command); |
| } |
| break; |
| |
| default: |
| if (describe_command_verbose) { |
| out1str(": not found\n"); |
| } |
| return 127; |
| } |
| out: |
| out1str("\n"); |
| return 0; |
| } |
| |
| static int FAST_FUNC |
| typecmd(int argc UNUSED_PARAM, char **argv) |
| { |
| int i = 1; |
| int err = 0; |
| int verbose = 1; |
| |
| /* type -p ... ? (we don't bother checking for 'p') */ |
| if (argv[1] && argv[1][0] == '-') { |
| i++; |
| verbose = 0; |
| } |
| while (argv[i]) { |
| err |= describe_command(argv[i++], NULL, verbose); |
| } |
| return err; |
| } |
| |
| #if ENABLE_ASH_CMDCMD |
| /* Is it "command [-p] PROG ARGS" bltin, no other opts? Return ptr to "PROG" if yes */ |
| static char ** |
| parse_command_args(char **argv, const char **path) |
| { |
| char *cp, c; |
| |
| for (;;) { |
| cp = *++argv; |
| if (!cp) |
| return NULL; |
| if (*cp++ != '-') |
| break; |
| c = *cp++; |
| if (!c) |
| break; |
| if (c == '-' && !*cp) { |
| if (!*++argv) |
| return NULL; |
| break; |
| } |
| do { |
| switch (c) { |
| case 'p': |
| *path = bb_default_path; |
| break; |
| default: |
| /* run 'typecmd' for other options */ |
| return NULL; |
| } |
| c = *cp++; |
| } while (c); |
| } |
| return argv; |
| } |
| |
| static int FAST_FUNC |
| commandcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
| { |
| char *cmd; |
| int c; |
| enum { |
| VERIFY_BRIEF = 1, |
| VERIFY_VERBOSE = 2, |
| } verify = 0; |
| const char *path = NULL; |
| |
| /* "command [-p] PROG ARGS" (that is, without -V or -v) |
| * never reaches this function. |
| */ |
| |
| while ((c = nextopt("pvV")) != '\0') |
| if (c == 'V') |
| verify |= VERIFY_VERBOSE; |
| else if (c == 'v') |
| /*verify |= VERIFY_BRIEF*/; |
| #if DEBUG |
| else if (c != 'p') |
| abort(); |
| #endif |
| else |
| path = bb_default_path; |
| |
| /* Mimic bash: just "command -v" doesn't complain, it's a nop */ |
| cmd = *argptr; |
| if (/*verify && */ cmd) |
| return describe_command(cmd, path, verify /* - VERIFY_BRIEF*/); |
| |
| return 0; |
| } |
| #endif |
| |
| |
| /*static int funcblocksize; // size of structures in function */ |
| /*static int funcstringsize; // size of strings in node */ |
| static void *funcblock; /* block to allocate function from */ |
| static char *funcstring_end; /* end of block to allocate strings from */ |
| |
| /* flags in argument to evaltree */ |
| #define EV_EXIT 01 /* exit after evaluating tree */ |
| #define EV_TESTED 02 /* exit status is checked; ignore -e flag */ |
| |
| static const uint8_t nodesize[N_NUMBER] ALIGN1 = { |
| [NCMD ] = SHELL_ALIGN(sizeof(struct ncmd)), |
| [NPIPE ] = SHELL_ALIGN(sizeof(struct npipe)), |
| [NREDIR ] = SHELL_ALIGN(sizeof(struct nredir)), |
| [NBACKGND ] = SHELL_ALIGN(sizeof(struct nredir)), |
| [NSUBSHELL] = SHELL_ALIGN(sizeof(struct nredir)), |
| [NAND ] = SHELL_ALIGN(sizeof(struct nbinary)), |
| [NOR ] = SHELL_ALIGN(sizeof(struct nbinary)), |
| [NSEMI ] = SHELL_ALIGN(sizeof(struct nbinary)), |
| [NIF ] = SHELL_ALIGN(sizeof(struct nif)), |
| [NWHILE ] = SHELL_ALIGN(sizeof(struct nbinary)), |
| [NUNTIL ] = SHELL_ALIGN(sizeof(struct nbinary)), |
| [NFOR ] = SHELL_ALIGN(sizeof(struct nfor)), |
| [NCASE ] = SHELL_ALIGN(sizeof(struct ncase)), |
| [NCLIST ] = SHELL_ALIGN(sizeof(struct nclist)), |
| [NDEFUN ] = SHELL_ALIGN(sizeof(struct narg)), |
| [NARG ] = SHELL_ALIGN(sizeof(struct narg)), |
| [NTO ] = SHELL_ALIGN(sizeof(struct nfile)), |
| #if BASH_REDIR_OUTPUT |
| [NTO2 ] = SHELL_ALIGN(sizeof(struct nfile)), |
| #endif |
| [NCLOBBER ] = SHELL_ALIGN(sizeof(struct nfile)), |
| [NFROM ] = SHELL_ALIGN(sizeof(struct nfile)), |
| [NFROMTO ] = SHELL_ALIGN(sizeof(struct nfile)), |
| [NAPPEND ] = SHELL_ALIGN(sizeof(struct nfile)), |
| [NTOFD ] = SHELL_ALIGN(sizeof(struct ndup)), |
| [NFROMFD ] = SHELL_ALIGN(sizeof(struct ndup)), |
| [NHERE ] = SHELL_ALIGN(sizeof(struct nhere)), |
| [NXHERE ] = SHELL_ALIGN(sizeof(struct nhere)), |
| [NNOT ] = SHELL_ALIGN(sizeof(struct nnot)), |
| }; |
| |
| static int calcsize(int funcblocksize, union node *n); |
| |
| static int |
| sizenodelist(int funcblocksize, struct nodelist *lp) |
| { |
| while (lp) { |
| funcblocksize += SHELL_ALIGN(sizeof(struct nodelist)); |
| funcblocksize = calcsize(funcblocksize, lp->n); |
| lp = lp->next; |
| } |
| return funcblocksize; |
| } |
| |
| static int |
| calcsize(int funcblocksize, union node *n) |
| { |
| if (n == NULL) |
| return funcblocksize; |
| funcblocksize += nodesize[n->type]; |
| switch (n->type) { |
| case NCMD: |
| funcblocksize = calcsize(funcblocksize, n->ncmd.redirect); |
| funcblocksize = calcsize(funcblocksize, n->ncmd.args); |
| funcblocksize = calcsize(funcblocksize, n->ncmd.assign); |
| break; |
| case NPIPE: |
| funcblocksize = sizenodelist(funcblocksize, n->npipe.cmdlist); |
| break; |
| case NREDIR: |
| case NBACKGND: |
| case NSUBSHELL: |
| funcblocksize = calcsize(funcblocksize, n->nredir.redirect); |
| funcblocksize = calcsize(funcblocksize, n->nredir.n); |
| break; |
| case NAND: |
| case NOR: |
| case NSEMI: |
| case NWHILE: |
| case NUNTIL: |
| funcblocksize = calcsize(funcblocksize, n->nbinary.ch2); |
| funcblocksize = calcsize(funcblocksize, n->nbinary.ch1); |
| break; |
| case NIF: |
| funcblocksize = calcsize(funcblocksize, n->nif.elsepart); |
| funcblocksize = calcsize(funcblocksize, n->nif.ifpart); |
| funcblocksize = calcsize(funcblocksize, n->nif.test); |
| break; |
| case NFOR: |
| funcblocksize += SHELL_ALIGN(strlen(n->nfor.var) + 1); /* was funcstringsize += ... */ |
| funcblocksize = calcsize(funcblocksize, n->nfor.body); |
| funcblocksize = calcsize(funcblocksize, n->nfor.args); |
| break; |
| case NCASE: |
| funcblocksize = calcsize(funcblocksize, n->ncase.cases); |
| funcblocksize = calcsize(funcblocksize, n->ncase.expr); |
| break; |
| case NCLIST: |
| funcblocksize = calcsize(funcblocksize, n->nclist.body); |
| funcblocksize = calcsize(funcblocksize, n->nclist.pattern); |
| funcblocksize = calcsize(funcblocksize, n->nclist.next); |
| break; |
| case NDEFUN: |
| case NARG: |
| funcblocksize = sizenodelist(funcblocksize, n->narg.backquote); |
| funcblocksize += SHELL_ALIGN(strlen(n->narg.text) + 1); /* was funcstringsize += ... */ |
| funcblocksize = calcsize(funcblocksize, n->narg.next); |
| break; |
| case NTO: |
| #if BASH_REDIR_OUTPUT |
| case NTO2: |
| #endif |
| case NCLOBBER: |
| case NFROM: |
| case NFROMTO: |
| case NAPPEND: |
| funcblocksize = calcsize(funcblocksize, n->nfile.fname); |
| funcblocksize = calcsize(funcblocksize, n->nfile.next); |
| break; |
| case NTOFD: |
| case NFROMFD: |
| funcblocksize = calcsize(funcblocksize, n->ndup.vname); |
| funcblocksize = calcsize(funcblocksize, n->ndup.next); |
| break; |
| case NHERE: |
| case NXHERE: |
| funcblocksize = calcsize(funcblocksize, n->nhere.doc); |
| funcblocksize = calcsize(funcblocksize, n->nhere.next); |
| break; |
| case NNOT: |
| funcblocksize = calcsize(funcblocksize, n->nnot.com); |
| break; |
| }; |
| return funcblocksize; |
| } |
| |
| static char * |
| nodeckstrdup(char *s) |
| { |
| funcstring_end -= SHELL_ALIGN(strlen(s) + 1); |
| return strcpy(funcstring_end, s); |
| } |
| |
| static union node *copynode(union node *); |
| |
| static struct nodelist * |
| copynodelist(struct nodelist *lp) |
| { |
| struct nodelist *start; |
| struct nodelist **lpp; |
| |
| lpp = &start; |
| while (lp) { |
| *lpp = funcblock; |
| funcblock = (char *) funcblock + SHELL_ALIGN(sizeof(struct nodelist)); |
| (*lpp)->n = copynode(lp->n); |
| lp = lp->next; |
| lpp = &(*lpp)->next; |
| } |
| *lpp = NULL; |
| return start; |
| } |
| |
| static union node * |
| copynode(union node *n) |
| { |
| union node *new; |
| |
| if (n == NULL) |
| return NULL; |
| new = funcblock; |
| funcblock = (char *) funcblock + nodesize[n->type]; |
| |
| switch (n->type) { |
| case NCMD: |
| new->ncmd.redirect = copynode(n->ncmd.redirect); |
| new->ncmd.args = copynode(n->ncmd.args); |
| new->ncmd.assign = copynode(n->ncmd.assign); |
| break; |
| case NPIPE: |
| new->npipe.cmdlist = copynodelist(n->npipe.cmdlist); |
| new->npipe.pipe_backgnd = n->npipe.pipe_backgnd; |
| break; |
| case NREDIR: |
| case NBACKGND: |
| case NSUBSHELL: |
| new->nredir.redirect = copynode(n->nredir.redirect); |
| new->nredir.n = copynode(n->nredir.n); |
| break; |
| case NAND: |
| case NOR: |
| case NSEMI: |
| case NWHILE: |
| case NUNTIL: |
| new->nbinary.ch2 = copynode(n->nbinary.ch2); |
| new->nbinary.ch1 = copynode(n->nbinary.ch1); |
| break; |
| case NIF: |
| new->nif.elsepart = copynode(n->nif.elsepart); |
| new->nif.ifpart = copynode(n->nif.ifpart); |
| new->nif.test = copynode(n->nif.test); |
| break; |
| case NFOR: |
| new->nfor.var = nodeckstrdup(n->nfor.var); |
| new->nfor.body = copynode(n->nfor.body); |
| new->nfor.args = copynode(n->nfor.args); |
| break; |
| case NCASE: |
| new->ncase.cases = copynode(n->ncase.cases); |
| new->ncase.expr = copynode(n->ncase.expr); |
| break; |
| case NCLIST: |
| new->nclist.body = copynode(n->nclist.body); |
| new->nclist.pattern = copynode(n->nclist.pattern); |
| new->nclist.next = copynode(n->nclist.next); |
| break; |
| case NDEFUN: |
| case NARG: |
| new->narg.backquote = copynodelist(n->narg.backquote); |
| new->narg.text = nodeckstrdup(n->narg.text); |
| new->narg.next = copynode(n->narg.next); |
| break; |
| case NTO: |
| #if BASH_REDIR_OUTPUT |
| case NTO2: |
| #endif |
| case NCLOBBER: |
| case NFROM: |
| case NFROMTO: |
| case NAPPEND: |
| new->nfile.fname = copynode(n->nfile.fname); |
| new->nfile.fd = n->nfile.fd; |
| new->nfile.next = copynode(n->nfile.next); |
| break; |
| case NTOFD: |
| case NFROMFD: |
| new->ndup.vname = copynode(n->ndup.vname); |
| new->ndup.dupfd = n->ndup.dupfd; |
| new->ndup.fd = n->ndup.fd; |
| new->ndup.next = copynode(n->ndup.next); |
| break; |
| case NHERE: |
| case NXHERE: |
| new->nhere.doc = copynode(n->nhere.doc); |
| new->nhere.fd = n->nhere.fd; |
| new->nhere.next = copynode(n->nhere.next); |
| break; |
| case NNOT: |
| new->nnot.com = copynode(n->nnot.com); |
| break; |
| }; |
| new->type = n->type; |
| return new; |
| } |
| |
| /* |
| * Make a copy of a parse tree. |
| */ |
| static struct funcnode * |
| copyfunc(union node *n) |
| { |
| struct funcnode *f; |
| size_t blocksize; |
| |
| /*funcstringsize = 0;*/ |
| blocksize = offsetof(struct funcnode, n) + calcsize(0, n); |
| f = ckzalloc(blocksize /* + funcstringsize */); |
| funcblock = (char *) f + offsetof(struct funcnode, n); |
| funcstring_end = (char *) f + blocksize; |
| copynode(n); |
| /* f->count = 0; - ckzalloc did it */ |
| return f; |
| } |
| |
| /* |
| * Define a shell function. |
| */ |
| static void |
| defun(union node *func) |
| { |
| struct cmdentry entry; |
| |
| INT_OFF; |
| entry.cmdtype = CMDFUNCTION; |
| entry.u.func = copyfunc(func); |
| addcmdentry(func->narg.text, &entry); |
| INT_ON; |
| } |
| |
| /* Reasons for skipping commands (see comment on breakcmd routine) */ |
| #define SKIPBREAK (1 << 0) |
| #define SKIPCONT (1 << 1) |
| #define SKIPFUNC (1 << 2) |
| static smallint evalskip; /* set to SKIPxxx if we are skipping commands */ |
| static int skipcount; /* number of levels to skip */ |
| static int funcnest; /* depth of function calls */ |
| static int loopnest; /* current loop nesting level */ |
| |
| /* Forward decl way out to parsing code - dotrap needs it */ |
| static int evalstring(char *s, int flags); |
| |
| /* Called to execute a trap. |
| * Single callsite - at the end of evaltree(). |
| * If we return non-zero, evaltree raises EXEXIT exception. |
| * |
| * Perhaps we should avoid entering new trap handlers |
| * while we are executing a trap handler. [is it a TODO?] |
| */ |
| static void |
| dotrap(void) |
| { |
| uint8_t *g; |
| int sig; |
| uint8_t last_status; |
| |
| if (!pending_sig) |
| return; |
| |
| last_status = exitstatus; |
| pending_sig = 0; |
| barrier(); |
| |
| TRACE(("dotrap entered\n")); |
| for (sig = 1, g = gotsig; sig < NSIG; sig++, g++) { |
| char *p; |
| |
| if (!*g) |
| continue; |
| |
| if (evalskip) { |
| pending_sig = sig; |
| break; |
| } |
| |
| p = trap[sig]; |
| /* non-trapped SIGINT is handled separately by raise_interrupt, |
| * don't upset it by resetting gotsig[SIGINT-1] */ |
| if (sig == SIGINT && !p) |
| continue; |
| |
| TRACE(("sig %d is active, will run handler '%s'\n", sig, p)); |
| *g = 0; |
| if (!p) |
| continue; |
| evalstring(p, 0); |
| } |
| exitstatus = last_status; |
| TRACE(("dotrap returns\n")); |
| } |
| |
| /* forward declarations - evaluation is fairly recursive business... */ |
| static int evalloop(union node *, int); |
| static int evalfor(union node *, int); |
| static int evalcase(union node *, int); |
| static int evalsubshell(union node *, int); |
| static void expredir(union node *); |
| static int evalpipe(union node *, int); |
| static int evalcommand(union node *, int); |
| static int evalbltin(const struct builtincmd *, int, char **, int); |
| static void prehash(union node *); |
| |
| /* |
| * Evaluate a parse tree. The value is left in the global variable |
| * exitstatus. |
| */ |
| static int |
| evaltree(union node *n, int flags) |
| { |
| int checkexit = 0; |
| int (*evalfn)(union node *, int); |
| int status = 0; |
| |
| if (n == NULL) { |
| TRACE(("evaltree(NULL) called\n")); |
| goto out; |
| } |
| TRACE(("evaltree(%p: %d, %d) called\n", n, n->type, flags)); |
| |
| dotrap(); |
| |
| switch (n->type) { |
| default: |
| #if DEBUG |
| out1fmt("Node type = %d\n", n->type); |
| fflush_all(); |
| break; |
| #endif |
| case NNOT: |
| status = !evaltree(n->nnot.com, EV_TESTED); |
| goto setstatus; |
| case NREDIR: |
| expredir(n->nredir.redirect); |
| status = redirectsafe(n->nredir.redirect, REDIR_PUSH); |
| if (!status) { |
| status = evaltree(n->nredir.n, flags & EV_TESTED); |
| } |
| if (n->nredir.redirect) |
| popredir(/*drop:*/ 0, /*restore:*/ 0 /* not sure */); |
| goto setstatus; |
| case NCMD: |
| evalfn = evalcommand; |
| checkexit: |
| if (eflag && !(flags & EV_TESTED)) |
| checkexit = ~0; |
| goto calleval; |
| case NFOR: |
| evalfn = evalfor; |
| goto calleval; |
| case NWHILE: |
| case NUNTIL: |
| evalfn = evalloop; |
| goto calleval; |
| case NSUBSHELL: |
| case NBACKGND: |
| evalfn = evalsubshell; |
| goto checkexit; |
| case NPIPE: |
| evalfn = evalpipe; |
| goto checkexit; |
| case NCASE: |
| evalfn = evalcase; |
| goto calleval; |
| case NAND: |
| case NOR: |
| case NSEMI: { |
| |
| #if NAND + 1 != NOR |
| #error NAND + 1 != NOR |
| #endif |
| #if NOR + 1 != NSEMI |
| #error NOR + 1 != NSEMI |
| #endif |
| unsigned is_or = n->type - NAND; |
| status = evaltree( |
| n->nbinary.ch1, |
| (flags | ((is_or >> 1) - 1)) & EV_TESTED |
| ); |
| if ((!status) == is_or || evalskip) |
| break; |
| n = n->nbinary.ch2; |
| evaln: |
| evalfn = evaltree; |
| calleval: |
| status = evalfn(n, flags); |
| goto setstatus; |
| } |
| case NIF: |
| status = evaltree(n->nif.test, EV_TESTED); |
| if (evalskip) |
| break; |
| if (!status) { |
| n = n->nif.ifpart; |
| goto evaln; |
| } |
| if (n->nif.elsepart) { |
| n = n->nif.elsepart; |
| goto evaln; |
| } |
| status = 0; |
| goto setstatus; |
| case NDEFUN: |
| defun(n); |
| /* Not necessary. To test it: |
| * "false; f() { qwerty; }; echo $?" should print 0. |
| */ |
| /* status = 0; */ |
| setstatus: |
| exitstatus = status; |
| break; |
| } |
| out: |
| /* Order of checks below is important: |
| * signal handlers trigger before exit caused by "set -e". |
| */ |
| dotrap(); |
| |
| if (checkexit & status) |
| raise_exception(EXEXIT); |
| if (flags & EV_EXIT) |
| raise_exception(EXEXIT); |
| |
| TRACE(("leaving evaltree (no interrupts)\n")); |
| return exitstatus; |
| } |
| |
| #if !defined(__alpha__) || (defined(__GNUC__) && __GNUC__ >= 3) |
| static |
| #endif |
| int evaltreenr(union node *, int) __attribute__ ((alias("evaltree"),__noreturn__)); |
| |
| static int |
| skiploop(void) |
| { |
| int skip = evalskip; |
| |
| switch (skip) { |
| case 0: |
| break; |
| case SKIPBREAK: |
| case SKIPCONT: |
| if (--skipcount <= 0) { |
| evalskip = 0; |
| break; |
| } |
| skip = SKIPBREAK; |
| break; |
| } |
| return skip; |
| } |
| |
| static int |
| evalloop(union node *n, int flags) |
| { |
| int skip; |
| int status; |
| |
| loopnest++; |
| status = 0; |
| flags &= EV_TESTED; |
| do { |
| int i; |
| |
| i = evaltree(n->nbinary.ch1, EV_TESTED); |
| skip = skiploop(); |
| if (skip == SKIPFUNC) |
| status = i; |
| if (skip) |
| continue; |
| if (n->type != NWHILE) |
| i = !i; |
| if (i != 0) |
| break; |
| status = evaltree(n->nbinary.ch2, flags); |
| skip = skiploop(); |
| } while (!(skip & ~SKIPCONT)); |
| loopnest--; |
| |
| return status; |
| } |
| |
| static int |
| evalfor(union node *n, int flags) |
| { |
| struct arglist arglist; |
| union node *argp; |
| struct strlist *sp; |
| struct stackmark smark; |
| int status = 0; |
| |
| setstackmark(&smark); |
| arglist.list = NULL; |
| arglist.lastp = &arglist.list; |
| for (argp = n->nfor.args; argp; argp = argp->narg.next) { |
| expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); |
| } |
| *arglist.lastp = NULL; |
| |
| loopnest++; |
| flags &= EV_TESTED; |
| for (sp = arglist.list; sp; sp = sp->next) { |
| setvar0(n->nfor.var, sp->text); |
| status = evaltree(n->nfor.body, flags); |
| if (skiploop() & ~SKIPCONT) |
| break; |
| } |
| loopnest--; |
| popstackmark(&smark); |
| |
| return status; |
| } |
| |
| static int |
| evalcase(union node *n, int flags) |
| { |
| union node *cp; |
| union node *patp; |
| struct arglist arglist; |
| struct stackmark smark; |
| int status = 0; |
| |
| setstackmark(&smark); |
| arglist.list = NULL; |
| arglist.lastp = &arglist.list; |
| expandarg(n->ncase.expr, &arglist, EXP_TILDE); |
| for (cp = n->ncase.cases; cp && evalskip == 0; cp = cp->nclist.next) { |
| for (patp = cp->nclist.pattern; patp; patp = patp->narg.next) { |
| if (casematch(patp, arglist.list->text)) { |
| /* Ensure body is non-empty as otherwise |
| * EV_EXIT may prevent us from setting the |
| * exit status. |
| */ |
| if (evalskip == 0 && cp->nclist.body) { |
| status = evaltree(cp->nclist.body, flags); |
| } |
| goto out; |
| } |
| } |
| } |
| out: |
| popstackmark(&smark); |
| |
| return status; |
| } |
| |
| /* |
| * Kick off a subshell to evaluate a tree. |
| */ |
| static int |
| evalsubshell(union node *n, int flags) |
| { |
| struct job *jp; |
| int backgnd = (n->type == NBACKGND); /* FORK_BG(1) if yes, else FORK_FG(0) */ |
| int status; |
| |
| expredir(n->nredir.redirect); |
| if (!backgnd && (flags & EV_EXIT) && !may_have_traps) |
| goto nofork; |
| INT_OFF; |
| if (backgnd == FORK_FG) |
| get_tty_state(); |
| jp = makejob(/*n,*/ 1); |
| if (forkshell(jp, n, backgnd) == 0) { |
| /* child */ |
| INT_ON; |
| flags |= EV_EXIT; |
| if (backgnd) |
| flags &= ~EV_TESTED; |
| nofork: |
| redirect(n->nredir.redirect, 0); |
| evaltreenr(n->nredir.n, flags); |
| /* never returns */ |
| } |
| /* parent */ |
| status = 0; |
| if (backgnd == FORK_FG) |
| status = waitforjob(jp); |
| INT_ON; |
| return status; |
| } |
| |
| /* |
| * Compute the names of the files in a redirection list. |
| */ |
| static void fixredir(union node *, const char *, int); |
| static void |
| expredir(union node *n) |
| { |
| union node *redir; |
| |
| for (redir = n; redir; redir = redir->nfile.next) { |
| struct arglist fn; |
| |
| fn.list = NULL; |
| fn.lastp = &fn.list; |
| switch (redir->type) { |
| case NFROMTO: |
| case NFROM: |
| case NTO: |
| #if BASH_REDIR_OUTPUT |
| case NTO2: |
| #endif |
| case NCLOBBER: |
| case NAPPEND: |
| expandarg(redir->nfile.fname, &fn, EXP_TILDE | EXP_REDIR); |
| TRACE(("expredir expanded to '%s'\n", fn.list->text)); |
| #if BASH_REDIR_OUTPUT |
| store_expfname: |
| #endif |
| #if 0 |
| // By the design of stack allocator, the loop of this kind: |
| // while true; do while true; do break; done </dev/null; done |
| // will look like a memory leak: ash plans to free expfname's |
| // of "/dev/null" as soon as it finishes running the loop |
| // (in this case, never). |
| // This "fix" is wrong: |
| if (redir->nfile.expfname) |
| stunalloc(redir->nfile.expfname); |
| // It results in corrupted state of stacked allocations. |
| #endif |
| redir->nfile.expfname = fn.list->text; |
| break; |
| case NFROMFD: |
| case NTOFD: /* >& */ |
| if (redir->ndup.vname) { |
| expandarg(redir->ndup.vname, &fn, EXP_FULL | EXP_TILDE); |
| if (fn.list == NULL) |
| ash_msg_and_raise_error("redir error"); |
| #if BASH_REDIR_OUTPUT |
| //FIXME: we used expandarg with different args! |
| if (!isdigit_str9(fn.list->text)) { |
| /* >&file, not >&fd */ |
| if (redir->nfile.fd != 1) /* 123>&file - BAD */ |
| ash_msg_and_raise_error("redir error"); |
| redir->type = NTO2; |
| goto store_expfname; |
| } |
| #endif |
| fixredir(redir, fn.list->text, 1); |
| } |
| break; |
| } |
| } |
| } |
| |
| /* |
| * Evaluate a pipeline. All the processes in the pipeline are children |
| * of the process creating the pipeline. (This differs from some versions |
| * of the shell, which make the last process in a pipeline the parent |
| * of all the rest.) |
| */ |
| static int |
| evalpipe(union node *n, int flags) |
| { |
| struct job *jp; |
| struct nodelist *lp; |
| int pipelen; |
| int prevfd; |
| int pip[2]; |
| int status = 0; |
| |
| TRACE(("evalpipe(0x%lx) called\n", (long)n)); |
| pipelen = 0; |
| for (lp = n->npipe.cmdlist; lp; lp = lp->next) |
| pipelen++; |
| flags |= EV_EXIT; |
| INT_OFF; |
| if (n->npipe.pipe_backgnd == 0) |
| get_tty_state(); |
| jp = makejob(/*n,*/ pipelen); |
| prevfd = -1; |
| for (lp = n->npipe.cmdlist; lp; lp = lp->next) { |
| prehash(lp->n); |
| pip[1] = -1; |
| if (lp->next) { |
| if (pipe(pip) < 0) { |
| close(prevfd); |
| ash_msg_and_raise_error("pipe call failed"); |
| } |
| } |
| if (forkshell(jp, lp->n, n->npipe.pipe_backgnd) == 0) { |
| /* child */ |
| INT_ON; |
| if (pip[1] >= 0) { |
| close(pip[0]); |
| } |
| if (prevfd > 0) { |
| dup2(prevfd, 0); |
| close(prevfd); |
| } |
| if (pip[1] > 1) { |
| dup2(pip[1], 1); |
| close(pip[1]); |
| } |
| evaltreenr(lp->n, flags); |
| /* never returns */ |
| } |
| /* parent */ |
| if (prevfd >= 0) |
| close(prevfd); |
| prevfd = pip[0]; |
| /* Don't want to trigger debugging */ |
| if (pip[1] != -1) |
| close(pip[1]); |
| } |
| if (n->npipe.pipe_backgnd == 0) { |
| status = waitforjob(jp); |
| TRACE(("evalpipe: job done exit status %d\n", status)); |
| } |
| INT_ON; |
| |
| return status; |
| } |
| |
| /* |
| * Controls whether the shell is interactive or not. |
| */ |
| static void |
| setinteractive(int on) |
| { |
| static smallint is_interactive; |
| |
| if (++on == is_interactive) |
| return; |
| is_interactive = on; |
| setsignal(SIGINT); |
| setsignal(SIGQUIT); |
| setsignal(SIGTERM); |
| #if !ENABLE_FEATURE_SH_EXTRA_QUIET |
| if (is_interactive > 1) { |
| /* Looks like they want an interactive shell */ |
| static smallint did_banner; |
| |
| if (!did_banner) { |
| /* note: ash and hush share this string */ |
| out1fmt("\n\n%s %s\n" |
| IF_ASH_HELP("Enter 'help' for a list of built-in commands.\n") |
| "\n", |
| bb_banner, |
| "built-in shell (ash)" |
| ); |
| did_banner = 1; |
| } |
| } |
| #endif |
| } |
| |
| static void |
| optschanged(void) |
| { |
| #if DEBUG |
| opentrace(); |
| #endif |
| setinteractive(iflag); |
| setjobctl(mflag); |
| #if ENABLE_FEATURE_EDITING_VI |
| if (viflag) |
| line_input_state->flags |= VI_MODE; |
| else |
| line_input_state->flags &= ~VI_MODE; |
| #else |
| viflag = 0; /* forcibly keep the option off */ |
| #endif |
| } |
| |
| static struct localvar *localvars; |
| |
| /* |
| * Called after a function returns. |
| * Interrupts must be off. |
| */ |
| static void |
| poplocalvars(void) |
| { |
| struct localvar *lvp; |
| struct var *vp; |
| |
| while ((lvp = localvars) != NULL) { |
| localvars = lvp->next; |
| vp = lvp->vp; |
| TRACE(("poplocalvar %s\n", vp ? vp->var_text : "-")); |
| if (vp == NULL) { /* $- saved */ |
| memcpy(optlist, lvp->text, sizeof(optlist)); |
| free((char*)lvp->text); |
| optschanged(); |
| } else if ((lvp->flags & (VUNSET|VSTRFIXED)) == VUNSET) { |
| unsetvar(vp->var_text); |
| } else { |
| if (vp->var_func) |
| vp->var_func(var_end(lvp->text)); |
| if ((vp->flags & (VTEXTFIXED|VSTACK)) == 0) |
| free((char*)vp->var_text); |
| vp->flags = lvp->flags; |
| vp->var_text = lvp->text; |
| } |
| free(lvp); |
| } |
| } |
| |
| static int |
| evalfun(struct funcnode *func, int argc, char **argv, int flags) |
| { |
| volatile struct shparam saveparam; |
| struct localvar *volatile savelocalvars; |
| struct jmploc *volatile savehandler; |
| struct jmploc jmploc; |
| int e; |
| |
| saveparam = shellparam; |
| savelocalvars = localvars; |
| savehandler = exception_handler; |
| e = setjmp(jmploc.loc); |
| if (e) { |
| goto funcdone; |
| } |
| INT_OFF; |
| exception_handler = &jmploc; |
| localvars = NULL; |
| shellparam.malloced = 0; |
| func->count++; |
| funcnest++; |
| INT_ON; |
| shellparam.nparam = argc - 1; |
| shellparam.p = argv + 1; |
| #if ENABLE_ASH_GETOPTS |
| shellparam.optind = 1; |
| shellparam.optoff = -1; |
| #endif |
| evaltree(func->n.narg.next, flags & EV_TESTED); |
| funcdone: |
| INT_OFF; |
| funcnest--; |
| freefunc(func); |
| poplocalvars(); |
| localvars = savelocalvars; |
| freeparam(&shellparam); |
| shellparam = saveparam; |
| exception_handler = savehandler; |
| INT_ON; |
| evalskip &= ~SKIPFUNC; |
| return e; |
| } |
| |
| /* |
| * Make a variable a local variable. When a variable is made local, it's |
| * value and flags are saved in a localvar structure. The saved values |
| * will be restored when the shell function returns. We handle the name |
| * "-" as a special case: it makes changes to "set +-options" local |
| * (options will be restored on return from the function). |
| */ |
| static void |
| mklocal(char *name) |
| { |
| struct localvar *lvp; |
| struct var **vpp; |
| struct var *vp; |
| char *eq = strchr(name, '='); |
| |
| INT_OFF; |
| /* Cater for duplicate "local". Examples: |
| * x=0; f() { local x=1; echo $x; local x; echo $x; }; f; echo $x |
| * x=0; f() { local x=1; echo $x; local x=2; echo $x; }; f; echo $x |
| */ |
| lvp = localvars; |
| while (lvp) { |
| if (lvp->vp && varcmp(lvp->vp->var_text, name) == 0) { |
| if (eq) |
| setvareq(name, 0); |
| /* else: |
| * it's a duplicate "local VAR" declaration, do nothing |
| */ |
| goto ret; |
| } |
| lvp = lvp->next; |
| } |
| |
| lvp = ckzalloc(sizeof(*lvp)); |
| if (LONE_DASH(name)) { |
| char *p; |
| p = ckmalloc(sizeof(optlist)); |
| lvp->text = memcpy(p, optlist, sizeof(optlist)); |
| vp = NULL; |
| } else { |
| vpp = hashvar(name); |
| vp = *findvar(vpp, name); |
| if (vp == NULL) { |
| /* variable did not exist yet */ |
| if (eq) |
| setvareq(name, VSTRFIXED); |
| else |
| setvar(name, NULL, VSTRFIXED); |
| vp = *vpp; /* the new variable */ |
| lvp->flags = VUNSET; |
| } else { |
| lvp->text = vp->var_text; |
| lvp->flags = vp->flags; |
| /* make sure neither "struct var" nor string gets freed |
| * during (un)setting: |
| */ |
| vp->flags |= VSTRFIXED|VTEXTFIXED; |
| if (eq) |
| setvareq(name, 0); |
| else |
| /* "local VAR" unsets VAR: */ |
| setvar0(name, NULL); |
| } |
| } |
| lvp->vp = vp; |
| lvp->next = localvars; |
| localvars = lvp; |
| ret: |
| INT_ON; |
| } |
| |
| /* |
| * The "local" command. |
| */ |
| static int FAST_FUNC |
| localcmd(int argc UNUSED_PARAM, char **argv) |
| { |
| char *name; |
| |
| if (!funcnest) |
| ash_msg_and_raise_error("not in a function"); |
| |
| argv = argptr; |
| while ((name = *argv++) != NULL) { |
| mklocal(name); |
| } |
| return 0; |
| } |
| |
| static int FAST_FUNC |
| falsecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
| { |
| return 1; |
| } |
| |
| static int FAST_FUNC |
| truecmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
| { |
| return 0; |
| } |
| |
| static int FAST_FUNC |
| execcmd(int argc UNUSED_PARAM, char **argv) |
| { |
| optionarg = NULL; |
| while (nextopt("a:") != '\0') |
| /* nextopt() sets optionarg to "-a ARGV0" */; |
| |
| argv = argptr; |
| if (argv[0]) { |
| char *prog; |
| |
| iflag = 0; /* exit on error */ |
| mflag = 0; |
| optschanged(); |
| /* We should set up signals for "exec CMD" |
| * the same way as for "CMD" without "exec". |
| * But optschanged->setinteractive->setsignal |
| * still thought we are a root shell. Therefore, for example, |
| * SIGQUIT is still set to IGN. Fix it: |
| */ |
| shlvl++; |
| setsignal(SIGQUIT); |
| /*setsignal(SIGTERM); - unnecessary because of iflag=0 */ |
| /*setsignal(SIGTSTP); - unnecessary because of mflag=0 */ |
| /*setsignal(SIGTTOU); - unnecessary because of mflag=0 */ |
| |
| prog = argv[0]; |
| if (optionarg) |
| argv[0] = optionarg; |
| shellexec(prog, argv, pathval(), 0); |
| /* NOTREACHED */ |
| } |
| return 0; |
| } |
| |
| /* |
| * The return command. |
| */ |
| static int FAST_FUNC |
| returncmd(int argc UNUSED_PARAM, char **argv) |
| { |
| /* |
| * If called outside a function, do what ksh does; |
| * skip the rest of the file. |
| */ |
| evalskip = SKIPFUNC; |
| return argv[1] ? number(argv[1]) : exitstatus; |
| } |
| |
| /* Forward declarations for builtintab[] */ |
| static int breakcmd(int, char **) FAST_FUNC; |
| static int dotcmd(int, char **) FAST_FUNC; |
| static int evalcmd(int, char **, int) FAST_FUNC; |
| static int exitcmd(int, char **) FAST_FUNC; |
| static int exportcmd(int, char **) FAST_FUNC; |
| #if ENABLE_ASH_GETOPTS |
| static int getoptscmd(int, char **) FAST_FUNC; |
| #endif |
| #if ENABLE_ASH_HELP |
| static int helpcmd(int, char **) FAST_FUNC; |
| #endif |
| #if MAX_HISTORY |
| static int historycmd(int, char **) FAST_FUNC; |
| #endif |
| #if ENABLE_FEATURE_SH_MATH |
| static int letcmd(int, char **) FAST_FUNC; |
| #endif |
| static int readcmd(int, char **) FAST_FUNC; |
| static int setcmd(int, char **) FAST_FUNC; |
| static int shiftcmd(int, char **) FAST_FUNC; |
| static int timescmd(int, char **) FAST_FUNC; |
| static int trapcmd(int, char **) FAST_FUNC; |
| static int umaskcmd(int, char **) FAST_FUNC; |
| static int unsetcmd(int, char **) FAST_FUNC; |
| static int ulimitcmd(int, char **) FAST_FUNC; |
| |
| #define BUILTIN_NOSPEC "0" |
| #define BUILTIN_SPECIAL "1" |
| #define BUILTIN_REGULAR "2" |
| #define BUILTIN_SPEC_REG "3" |
| #define BUILTIN_ASSIGN "4" |
| #define BUILTIN_SPEC_ASSG "5" |
| #define BUILTIN_REG_ASSG "6" |
| #define BUILTIN_SPEC_REG_ASSG "7" |
| |
| /* Stubs for calling non-FAST_FUNC's */ |
| #if ENABLE_ASH_ECHO |
| static int FAST_FUNC echocmd(int argc, char **argv) { return echo_main(argc, argv); } |
| #endif |
| #if ENABLE_ASH_PRINTF |
| static int FAST_FUNC printfcmd(int argc, char **argv) { return printf_main(argc, argv); } |
| #endif |
| #if ENABLE_ASH_TEST || BASH_TEST2 |
| static int FAST_FUNC testcmd(int argc, char **argv) { return test_main(argc, argv); } |
| #endif |
| |
| /* Keep these in proper order since it is searched via bsearch() */ |
| static const struct builtincmd builtintab[] = { |
| { BUILTIN_SPEC_REG "." , dotcmd }, |
| { BUILTIN_SPEC_REG ":" , truecmd }, |
| #if ENABLE_ASH_TEST |
| { BUILTIN_REGULAR "[" , testcmd }, |
| #endif |
| #if BASH_TEST2 |
| { BUILTIN_REGULAR "[[" , testcmd }, |
| #endif |
| #if ENABLE_ASH_ALIAS |
| { BUILTIN_REG_ASSG "alias" , aliascmd }, |
| #endif |
| #if JOBS |
| { BUILTIN_REGULAR "bg" , fg_bgcmd }, |
| #endif |
| { BUILTIN_SPEC_REG "break" , breakcmd }, |
| { BUILTIN_REGULAR "cd" , cdcmd }, |
| { BUILTIN_NOSPEC "chdir" , cdcmd }, |
| #if ENABLE_ASH_CMDCMD |
| { BUILTIN_REGULAR "command" , commandcmd }, |
| #endif |
| { BUILTIN_SPEC_REG "continue", breakcmd }, |
| #if ENABLE_ASH_ECHO |
| { BUILTIN_REGULAR "echo" , echocmd }, |
| #endif |
| { BUILTIN_SPEC_REG "eval" , NULL }, /*evalcmd() has a differing prototype*/ |
| { BUILTIN_SPEC_REG "exec" , execcmd }, |
| { BUILTIN_SPEC_REG "exit" , exitcmd }, |
| { BUILTIN_SPEC_REG_ASSG "export" , exportcmd }, |
| { BUILTIN_REGULAR "false" , falsecmd }, |
| #if JOBS |
| { BUILTIN_REGULAR "fg" , fg_bgcmd }, |
| #endif |
| #if ENABLE_ASH_GETOPTS |
| { BUILTIN_REGULAR "getopts" , getoptscmd }, |
| #endif |
| { BUILTIN_NOSPEC "hash" , hashcmd }, |
| #if ENABLE_ASH_HELP |
| { BUILTIN_NOSPEC "help" , helpcmd }, |
| #endif |
| #if MAX_HISTORY |
| { BUILTIN_NOSPEC "history" , historycmd }, |
| #endif |
| #if JOBS |
| { BUILTIN_REGULAR "jobs" , jobscmd }, |
| { BUILTIN_REGULAR "kill" , killcmd }, |
| #endif |
| #if ENABLE_FEATURE_SH_MATH |
| { BUILTIN_NOSPEC "let" , letcmd }, |
| #endif |
| { BUILTIN_ASSIGN "local" , localcmd }, |
| #if ENABLE_ASH_PRINTF |
| { BUILTIN_REGULAR "printf" , printfcmd }, |
| #endif |
| { BUILTIN_NOSPEC "pwd" , pwdcmd }, |
| { BUILTIN_REGULAR "read" , readcmd }, |
| { BUILTIN_SPEC_REG_ASSG "readonly", exportcmd }, |
| { BUILTIN_SPEC_REG "return" , returncmd }, |
| { BUILTIN_SPEC_REG "set" , setcmd }, |
| { BUILTIN_SPEC_REG "shift" , shiftcmd }, |
| #if BASH_SOURCE |
| { BUILTIN_SPEC_REG "source" , dotcmd }, |
| #endif |
| #if ENABLE_ASH_TEST |
| { BUILTIN_REGULAR "test" , testcmd }, |
| #endif |
| { BUILTIN_SPEC_REG "times" , timescmd }, |
| { BUILTIN_SPEC_REG "trap" , trapcmd }, |
| { BUILTIN_REGULAR "true" , truecmd }, |
| { BUILTIN_NOSPEC "type" , typecmd }, |
| { BUILTIN_NOSPEC "ulimit" , ulimitcmd }, |
| { BUILTIN_REGULAR "umask" , umaskcmd }, |
| #if ENABLE_ASH_ALIAS |
| { BUILTIN_REGULAR "unalias" , unaliascmd }, |
| #endif |
| { BUILTIN_SPEC_REG "unset" , unsetcmd }, |
| { BUILTIN_REGULAR "wait" , waitcmd }, |
| }; |
| |
| /* Should match the above table! */ |
| #define COMMANDCMD (builtintab + \ |
| /* . : */ 2 + \ |
| /* [ */ 1 * ENABLE_ASH_TEST + \ |
| /* [[ */ 1 * BASH_TEST2 + \ |
| /* alias */ 1 * ENABLE_ASH_ALIAS + \ |
| /* bg */ 1 * ENABLE_ASH_JOB_CONTROL + \ |
| /* break cd cddir */ 3) |
| #define EVALCMD (COMMANDCMD + \ |
| /* command */ 1 * ENABLE_ASH_CMDCMD + \ |
| /* continue */ 1 + \ |
| /* echo */ 1 * ENABLE_ASH_ECHO + \ |
| 0) |
| #define EXECCMD (EVALCMD + \ |
| /* eval */ 1) |
| |
| /* |
| * Search the table of builtin commands. |
| */ |
| static int |
| pstrcmp1(const void *a, const void *b) |
| { |
| return strcmp((char*)a, *(char**)b + 1); |
| } |
| static struct builtincmd * |
| find_builtin(const char *name) |
| { |
| struct builtincmd *bp; |
| |
| bp = bsearch( |
| name, builtintab, ARRAY_SIZE(builtintab), sizeof(builtintab[0]), |
| pstrcmp1 |
| ); |
| return bp; |
| } |
| |
| /* |
| * Execute a simple command. |
| */ |
| static int |
| isassignment(const char *p) |
| { |
| const char *q = endofname(p); |
| if (p == q) |
| return 0; |
| return *q == '='; |
| } |
| static int FAST_FUNC |
| bltincmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
| { |
| /* Preserve exitstatus of a previous possible redirection |
| * as POSIX mandates */ |
| return back_exitstatus; |
| } |
| static int |
| evalcommand(union node *cmd, int flags) |
| { |
| static const struct builtincmd null_bltin = { |
| "\0\0", bltincmd /* why three NULs? */ |
| }; |
| struct stackmark smark; |
| union node *argp; |
| struct arglist arglist; |
| struct arglist varlist; |
| char **argv; |
| int argc; |
| const struct strlist *sp; |
| struct cmdentry cmdentry; |
| struct job *jp; |
| char *lastarg; |
| const char *path; |
| int spclbltin; |
| int status; |
| char **nargv; |
| struct builtincmd *bcmd; |
| smallint cmd_is_exec; |
| smallint pseudovarflag = 0; |
| |
| /* First expand the arguments. */ |
| TRACE(("evalcommand(0x%lx, %d) called\n", (long)cmd, flags)); |
| setstackmark(&smark); |
| back_exitstatus = 0; |
| |
| cmdentry.cmdtype = CMDBUILTIN; |
| cmdentry.u.cmd = &null_bltin; |
| varlist.lastp = &varlist.list; |
| *varlist.lastp = NULL; |
| arglist.lastp = &arglist.list; |
| *arglist.lastp = NULL; |
| |
| argc = 0; |
| if (cmd->ncmd.args) { |
| bcmd = find_builtin(cmd->ncmd.args->narg.text); |
| pseudovarflag = bcmd && IS_BUILTIN_ASSIGN(bcmd); |
| } |
| |
| for (argp = cmd->ncmd.args; argp; argp = argp->narg.next) { |
| struct strlist **spp; |
| |
| spp = arglist.lastp; |
| if (pseudovarflag && isassignment(argp->narg.text)) |
| expandarg(argp, &arglist, EXP_VARTILDE); |
| else |
| expandarg(argp, &arglist, EXP_FULL | EXP_TILDE); |
| |
| for (sp = *spp; sp; sp = sp->next) |
| argc++; |
| } |
| |
| /* Reserve one extra spot at the front for shellexec. */ |
| nargv = stalloc(sizeof(char *) * (argc + 2)); |
| argv = ++nargv; |
| for (sp = arglist.list; sp; sp = sp->next) { |
| TRACE(("evalcommand arg: %s\n", sp->text)); |
| *nargv++ = sp->text; |
| } |
| *nargv = NULL; |
| |
| lastarg = NULL; |
| if (iflag && funcnest == 0 && argc > 0) |
| lastarg = nargv[-1]; |
| |
| preverrout_fd = 2; |
| expredir(cmd->ncmd.redirect); |
| status = redirectsafe(cmd->ncmd.redirect, REDIR_PUSH | REDIR_SAVEFD2); |
| |
| path = vpath.var_text; |
| for (argp = cmd->ncmd.assign; argp; argp = argp->narg.next) { |
| struct strlist **spp; |
| char *p; |
| |
| spp = varlist.lastp; |
| expandarg(argp, &varlist, EXP_VARTILDE); |
| |
| /* |
| * Modify the command lookup path, if a PATH= assignment |
| * is present |
| */ |
| p = (*spp)->text; |
| if (varcmp(p, path) == 0) |
| path = p; |
| } |
| |
| /* Print the command if xflag is set. */ |
| if (xflag) { |
| int n; |
| const char *p = " %s" + 1; |
| |
| fdprintf(preverrout_fd, p, expandstr(ps4val())); |
| sp = varlist.list; |
| for (n = 0; n < 2; n++) { |
| while (sp) { |
| fdprintf(preverrout_fd, p, sp->text); |
| sp = sp->next; |
| p = " %s"; |
| } |
| sp = arglist.list; |
| } |
| safe_write(preverrout_fd, "\n", 1); |
| } |
| |
| cmd_is_exec = 0; |
| spclbltin = -1; |
| |
| /* Now locate the command. */ |
| if (argc) { |
| int cmd_flag = DO_ERR; |
| #if ENABLE_ASH_CMDCMD |
| const char *oldpath = path + 5; |
| #endif |
| path += 5; |
| for (;;) { |
| find_command(argv[0], &cmdentry, cmd_flag, path); |
| if (cmdentry.cmdtype == CMDUNKNOWN) { |
| flush_stdout_stderr(); |
| status = 127; |
| goto bail; |
| } |
| |
| /* implement bltin and command here */ |
| if (cmdentry.cmdtype != CMDBUILTIN) |
| break; |
| if (spclbltin < 0) |
| spclbltin = IS_BUILTIN_SPECIAL(cmdentry.u.cmd); |
| if (cmdentry.u.cmd == EXECCMD) |
| cmd_is_exec = 1; |
| #if ENABLE_ASH_CMDCMD |
| if (cmdentry.u.cmd == COMMANDCMD) { |
| path = oldpath; |
| nargv = parse_command_args(argv, &path); |
| if (!nargv) |
| break; |
| /* It's "command [-p] PROG ARGS" (that is, no -Vv). |
| * nargv => "PROG". path is updated if -p. |
| */ |
| argc -= nargv - argv; |
| argv = nargv; |
| cmd_flag |= DO_NOFUNC; |
| } else |
| #endif |
| break; |
| } |
| } |
| |
| if (status) { |
| bail: |
| exitstatus = status; |
| |
| /* We have a redirection error. */ |
| if (spclbltin > 0) |
| raise_exception(EXERROR); |
| |
| goto out; |
| } |
| |
| /* Execute the command. */ |
| switch (cmdentry.cmdtype) { |
| default: { |
| |
| #if ENABLE_FEATURE_SH_NOFORK |
| /* (1) BUG: if variables are set, we need to fork, or save/restore them |
| * around run_nofork_applet() call. |
| * (2) Should this check also be done in forkshell()? |
| * (perhaps it should, so that "VAR=VAL nofork" at least avoids exec...) |
| */ |
| /* find_command() encodes applet_no as (-2 - applet_no) */ |
| int applet_no = (- cmdentry.u.index - 2); |
| if (applet_no >= 0 && APPLET_IS_NOFORK(applet_no)) { |
| listsetvar(varlist.list, VEXPORT|VSTACK); |
| /* run <applet>_main() */ |
| status = run_nofork_applet(applet_no, argv); |
| break; |
| } |
| #endif |
| /* Can we avoid forking off? For example, very last command |
| * in a script or a subshell does not need forking, |
| * we can just exec it. |
| */ |
| if (!(flags & EV_EXIT) || may_have_traps) { |
| /* No, forking off a child is necessary */ |
| INT_OFF; |
| get_tty_state(); |
| jp = makejob(/*cmd,*/ 1); |
| if (forkshell(jp, cmd, FORK_FG) != 0) { |
| /* parent */ |
| status = waitforjob(jp); |
| INT_ON; |
| TRACE(("forked child exited with %d\n", status)); |
| break; |
| } |
| /* child */ |
| FORCE_INT_ON; |
| /* fall through to exec'ing external program */ |
| } |
| listsetvar(varlist.list, VEXPORT|VSTACK); |
| shellexec(argv[0], argv, path, cmdentry.u.index); |
| /* NOTREACHED */ |
| } /* default */ |
| case CMDBUILTIN: |
| cmdenviron = varlist.list; |
| if (cmdenviron) { |
| struct strlist *list = cmdenviron; |
| int i = VNOSET; |
| if (spclbltin > 0 || argc == 0) { |
| i = 0; |
| if (cmd_is_exec && argc > 1) |
| i = VEXPORT; |
| } |
| listsetvar(list, i); |
| } |
| /* Tight loop with builtins only: |
| * "while kill -0 $child; do true; done" |
| * will never exit even if $child died, unless we do this |
| * to reap the zombie and make kill detect that it's gone: */ |
| dowait(DOWAIT_NONBLOCK, NULL); |
| |
| if (evalbltin(cmdentry.u.cmd, argc, argv, flags)) { |
| if (exception_type == EXERROR && spclbltin <= 0) { |
| FORCE_INT_ON; |
| goto readstatus; |
| } |
| raise: |
| longjmp(exception_handler->loc, 1); |
| } |
| goto readstatus; |
| |
| case CMDFUNCTION: |
| listsetvar(varlist.list, 0); |
| /* See above for the rationale */ |
| dowait(DOWAIT_NONBLOCK, NULL); |
| if (evalfun(cmdentry.u.func, argc, argv, flags)) |
| goto raise; |
| readstatus: |
| status = exitstatus; |
| break; |
| } /* switch */ |
| |
| out: |
| if (cmd->ncmd.redirect) |
| popredir(/*drop:*/ cmd_is_exec, /*restore:*/ cmd_is_exec); |
| if (lastarg) { |
| /* dsl: I think this is intended to be used to support |
| * '_' in 'vi' command mode during line editing... |
| * However I implemented that within libedit itself. |
| */ |
| setvar0("_", lastarg); |
| } |
| popstackmark(&smark); |
| |
| return status; |
| } |
| |
| static int |
| evalbltin(const struct builtincmd *cmd, int argc, char **argv, int flags) |
| { |
| char *volatile savecmdname; |
| struct jmploc *volatile savehandler; |
| struct jmploc jmploc; |
| int status; |
| int i; |
| |
| savecmdname = commandname; |
| savehandler = exception_handler; |
| i = setjmp(jmploc.loc); |
| if (i) |
| goto cmddone; |
| exception_handler = &jmploc; |
| commandname = argv[0]; |
| argptr = argv + 1; |
| optptr = NULL; /* initialize nextopt */ |
| if (cmd == EVALCMD) |
| status = evalcmd(argc, argv, flags); |
| else |
| status = (*cmd->builtin)(argc, argv); |
| flush_stdout_stderr(); |
| status |= ferror(stdout); |
| exitstatus = status; |
| cmddone: |
| clearerr(stdout); |
| commandname = savecmdname; |
| exception_handler = savehandler; |
| |
| return i; |
| } |
| |
| static int |
| goodname(const char *p) |
| { |
| return endofname(p)[0] == '\0'; |
| } |
| |
| |
| /* |
| * Search for a command. This is called before we fork so that the |
| * location of the command will be available in the parent as well as |
| * the child. The check for "goodname" is an overly conservative |
| * check that the name will not be subject to expansion. |
| */ |
| static void |
| prehash(union node *n) |
| { |
| struct cmdentry entry; |
| |
| if (n->type == NCMD && n->ncmd.args && goodname(n->ncmd.args->narg.text)) |
| find_command(n->ncmd.args->narg.text, &entry, 0, pathval()); |
| } |
| |
| |
| /* ============ Builtin commands |
| * |
| * Builtin commands whose functions are closely tied to evaluation |
| * are implemented here. |
| */ |
| |
| /* |
| * Handle break and continue commands. Break, continue, and return are |
| * all handled by setting the evalskip flag. The evaluation routines |
| * above all check this flag, and if it is set they start skipping |
| * commands rather than executing them. The variable skipcount is |
| * the number of loops to break/continue, or the number of function |
| * levels to return. (The latter is always 1.) It should probably |
| * be an error to break out of more loops than exist, but it isn't |
| * in the standard shell so we don't make it one here. |
| */ |
| static int FAST_FUNC |
| breakcmd(int argc UNUSED_PARAM, char **argv) |
| { |
| int n = argv[1] ? number(argv[1]) : 1; |
| |
| if (n <= 0) |
| ash_msg_and_raise_error(msg_illnum, argv[1]); |
| if (n > loopnest) |
| n = loopnest; |
| if (n > 0) { |
| evalskip = (**argv == 'c') ? SKIPCONT : SKIPBREAK; |
| skipcount = n; |
| } |
| return 0; |
| } |
| |
| |
| /* |
| * This implements the input routines used by the parser. |
| */ |
| |
| enum { |
| INPUT_PUSH_FILE = 1, |
| INPUT_NOFILE_OK = 2, |
| }; |
| |
| static smallint checkkwd; |
| /* values of checkkwd variable */ |
| #define CHKALIAS 0x1 |
| #define CHKKWD 0x2 |
| #define CHKNL 0x4 |
| |
| /* |
| * Push a string back onto the input at this current parsefile level. |
| * We handle aliases this way. |
| */ |
| #if !ENABLE_ASH_ALIAS |
| #define pushstring(s, ap) pushstring(s) |
| #endif |
| static void |
| pushstring(char *s, struct alias *ap) |
| { |
| struct strpush *sp; |
| int len; |
| |
| len = strlen(s); |
| INT_OFF; |
| if (g_parsefile->strpush) { |
| sp = ckzalloc(sizeof(*sp)); |
| sp->prev = g_parsefile->strpush; |
| } else { |
| sp = &(g_parsefile->basestrpush); |
| } |
| g_parsefile->strpush = sp; |
| sp->prev_string = g_parsefile->next_to_pgetc; |
| sp->prev_left_in_line = g_parsefile->left_in_line; |
| sp->unget = g_parsefile->unget; |
| memcpy(sp->lastc, g_parsefile->lastc, sizeof(sp->lastc)); |
| #if ENABLE_ASH_ALIAS |
| sp->ap = ap; |
| if (ap) { |
| ap->flag |= ALIASINUSE; |
| sp->string = s; |
| } |
| #endif |
| g_parsefile->next_to_pgetc = s; |
| g_parsefile->left_in_line = len; |
| g_parsefile->unget = 0; |
| INT_ON; |
| } |
| |
| static void |
| popstring(void) |
| { |
| struct strpush *sp = g_parsefile->strpush; |
| |
| INT_OFF; |
| #if ENABLE_ASH_ALIAS |
| if (sp->ap) { |
| if (g_parsefile->next_to_pgetc[-1] == ' ' |
| || g_parsefile->next_to_pgetc[-1] == '\t' |
| ) { |
| checkkwd |= CHKALIAS; |
| } |
| if (sp->string != sp->ap->val) { |
| free(sp->string); |
| } |
| sp->ap->flag &= ~ALIASINUSE; |
| if (sp->ap->flag & ALIASDEAD) { |
| unalias(sp->ap->name); |
| } |
| } |
| #endif |
| g_parsefile->next_to_pgetc = sp->prev_string; |
| g_parsefile->left_in_line = sp->prev_left_in_line; |
| g_parsefile->unget = sp->unget; |
| memcpy(g_parsefile->lastc, sp->lastc, sizeof(sp->lastc)); |
| g_parsefile->strpush = sp->prev; |
| if (sp != &(g_parsefile->basestrpush)) |
| free(sp); |
| INT_ON; |
| } |
| |
| static int |
| preadfd(void) |
| { |
| int nr; |
| char *buf = g_parsefile->buf; |
| |
| g_parsefile->next_to_pgetc = buf; |
| #if ENABLE_FEATURE_EDITING |
| retry: |
| if (!iflag || g_parsefile->pf_fd != STDIN_FILENO) |
| nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1); |
| else { |
| int timeout = -1; |
| # if ENABLE_ASH_IDLE_TIMEOUT |
| if (iflag) { |
| const char *tmout_var = lookupvar("TMOUT"); |
| if (tmout_var) { |
| timeout = atoi(tmout_var) * 1000; |
| if (timeout <= 0) |
| timeout = -1; |
| } |
| } |
| # endif |
| # if ENABLE_FEATURE_TAB_COMPLETION |
| line_input_state->path_lookup = pathval(); |
| # endif |
| reinit_unicode_for_ash(); |
| nr = read_line_input(line_input_state, cmdedit_prompt, buf, IBUFSIZ, timeout); |
| if (nr == 0) { |
| /* ^C pressed, "convert" to SIGINT */ |
| write(STDOUT_FILENO, "^C", 2); |
| if (trap[SIGINT]) { |
| buf[0] = '\n'; |
| buf[1] = '\0'; |
| raise(SIGINT); |
| return 1; |
| } |
| exitstatus = 128 + SIGINT; |
| bb_putchar('\n'); |
| goto retry; |
| } |
| if (nr < 0) { |
| if (errno == 0) { |
| /* Ctrl+D pressed */ |
| nr = 0; |
| } |
| # if ENABLE_ASH_IDLE_TIMEOUT |
| else if (errno == EAGAIN && timeout > 0) { |
| puts("\007timed out waiting for input: auto-logout"); |
| exitshell(); |
| } |
| # endif |
| } |
| } |
| #else |
| nr = nonblock_immune_read(g_parsefile->pf_fd, buf, IBUFSIZ - 1); |
| #endif |
| |
| #if 0 /* disabled: nonblock_immune_read() handles this problem */ |
| if (nr < 0) { |
| if (parsefile->fd == 0 && errno == EWOULDBLOCK) { |
| int flags = fcntl(0, F_GETFL); |
| if (flags >= 0 && (flags & O_NONBLOCK)) { |
| flags &= ~O_NONBLOCK; |
| if (fcntl(0, F_SETFL, flags) >= 0) { |
| out2str("sh: turning off NDELAY mode\n"); |
| goto retry; |
| } |
| } |
| } |
| } |
| #endif |
| return nr; |
| } |
| |
| /* |
| * Refill the input buffer and return the next input character: |
| * |
| * 1) If a string was pushed back on the input, pop it; |
| * 2) If an EOF was pushed back (g_parsefile->left_in_line < -BIGNUM) |
| * or we are reading from a string so we can't refill the buffer, |
| * return EOF. |
| * 3) If there is more stuff in this buffer, use it else call read to fill it. |
| * 4) Process input up to the next newline, deleting nul characters. |
| */ |
| //#define pgetc_debug(...) bb_error_msg(__VA_ARGS__) |
| #define pgetc_debug(...) ((void)0) |
| static int pgetc(void); |
| static int |
| preadbuffer(void) |
| { |
| char *q; |
| int more; |
| |
| if (g_parsefile->strpush) { |
| #if ENABLE_ASH_ALIAS |
| if (g_parsefile->left_in_line == -1 |
| && g_parsefile->strpush->ap |
| && g_parsefile->next_to_pgetc[-1] != ' ' |
| && g_parsefile->next_to_pgetc[-1] != '\t' |
| ) { |
| pgetc_debug("preadbuffer PEOA"); |
| return PEOA; |
| } |
| #endif |
| popstring(); |
| return pgetc(); |
| } |
| /* on both branches above g_parsefile->left_in_line < 0. |
| * "pgetc" needs refilling. |
| */ |
| |
| /* -90 is our -BIGNUM. Below we use -99 to mark "EOF on read", |
| * pungetc() may increment it a few times. |
| * Assuming it won't increment it to less than -90. |
| */ |
| if (g_parsefile->left_in_line < -90 || g_parsefile->buf == NULL) { |
| pgetc_debug("preadbuffer PEOF1"); |
| /* even in failure keep left_in_line and next_to_pgetc |
| * in lock step, for correct multi-layer pungetc. |
| * left_in_line was decremented before preadbuffer(), |
| * must inc next_to_pgetc: */ |
| g_parsefile->next_to_pgetc++; |
| return PEOF; |
| } |
| |
| more = g_parsefile->left_in_buffer; |
| if (more <= 0) { |
| flush_stdout_stderr(); |
| again: |
| more = preadfd(); |
| if (more <= 0) { |
| /* don't try reading again */ |
| g_parsefile->left_in_line = -99; |
| pgetc_debug("preadbuffer PEOF2"); |
| g_parsefile->next_to_pgetc++; |
| return PEOF; |
| } |
| } |
| |
| /* Find out where's the end of line. |
| * Set g_parsefile->left_in_line |
| * and g_parsefile->left_in_buffer acordingly. |
| * NUL chars are deleted. |
| */ |
| q = g_parsefile->next_to_pgetc; |
| for (;;) { |
| char c; |
| |
| more--; |
| |
| c = *q; |
| if (c == '\0') { |
| memmove(q, q + 1, more); |
| } else { |
| q++; |
| if (c == '\n') { |
| g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1; |
| break; |
| } |
| } |
| |
| if (more <= 0) { |
| g_parsefile->left_in_line = q - g_parsefile->next_to_pgetc - 1; |
| if (g_parsefile->left_in_line < 0) |
| goto again; |
| break; |
| } |
| } |
| g_parsefile->left_in_buffer = more; |
| |
| if (vflag) { |
| char save = *q; |
| *q = '\0'; |
| out2str(g_parsefile->next_to_pgetc); |
| *q = save; |
| } |
| |
| pgetc_debug("preadbuffer at %d:%p'%s'", |
| g_parsefile->left_in_line, |
| g_parsefile->next_to_pgetc, |
| g_parsefile->next_to_pgetc); |
| return (unsigned char)*g_parsefile->next_to_pgetc++; |
| } |
| |
| static void |
| nlprompt(void) |
| { |
| g_parsefile->linno++; |
| setprompt_if(doprompt, 2); |
| } |
| static void |
| nlnoprompt(void) |
| { |
| g_parsefile->linno++; |
| needprompt = doprompt; |
| } |
| |
| static int |
| pgetc(void) |
| { |
| int c; |
| |
| pgetc_debug("pgetc at %d:%p'%s'", |
| g_parsefile->left_in_line, |
| g_parsefile->next_to_pgetc, |
| g_parsefile->next_to_pgetc); |
| if (g_parsefile->unget) |
| return g_parsefile->lastc[--g_parsefile->unget]; |
| |
| if (--g_parsefile->left_in_line >= 0) |
| c = (unsigned char)*g_parsefile->next_to_pgetc++; |
| else |
| c = preadbuffer(); |
| |
| g_parsefile->lastc[1] = g_parsefile->lastc[0]; |
| g_parsefile->lastc[0] = c; |
| |
| return c; |
| } |
| |
| #if ENABLE_ASH_ALIAS |
| static int |
| pgetc_without_PEOA(void) |
| { |
| int c; |
| do { |
| pgetc_debug("pgetc at %d:%p'%s'", |
| g_parsefile->left_in_line, |
| g_parsefile->next_to_pgetc, |
| g_parsefile->next_to_pgetc); |
| c = pgetc(); |
| } while (c == PEOA); |
| return c; |
| } |
| #else |
| # define pgetc_without_PEOA() pgetc() |
| #endif |
| |
| /* |
| * Read a line from the script. |
| */ |
| static char * |
| pfgets(char *line, int len) |
| { |
| char *p = line; |
| int nleft = len; |
| int c; |
| |
| while (--nleft > 0) { |
| c = pgetc_without_PEOA(); |
| if (c == PEOF) { |
| if (p == line) |
| return NULL; |
| break; |
| } |
| *p++ = c; |
| if (c == '\n') |
| break; |
| } |
| *p = '\0'; |
| return line; |
| } |
| |
| /* |
| * Undo a call to pgetc. Only two characters may be pushed back. |
| * PEOF may be pushed back. |
| */ |
| static void |
| pungetc(void) |
| { |
| g_parsefile->unget++; |
| } |
| |
| /* This one eats backslash+newline */ |
| static int |
| pgetc_eatbnl(void) |
| { |
| int c; |
| |
| while ((c = pgetc()) == '\\') { |
| if (pgetc() != '\n') { |
| pungetc(); |
| break; |
| } |
| |
| nlprompt(); |
| } |
| |
| return c; |
| } |
| |
| /* |
| * To handle the "." command, a stack of input files is used. Pushfile |
| * adds a new entry to the stack and popfile restores the previous level. |
| */ |
| static void |
| pushfile(void) |
| { |
| struct parsefile *pf; |
| |
| pf = ckzalloc(sizeof(*pf)); |
| pf->prev = g_parsefile; |
| pf->pf_fd = -1; |
| /*pf->strpush = NULL; - ckzalloc did it */ |
| /*pf->basestrpush.prev = NULL;*/ |
| /*pf->unget = 0;*/ |
| g_parsefile = pf; |
| } |
| |
| static void |
| popfile(void) |
| { |
| struct parsefile *pf = g_parsefile; |
| |
| if (pf == &basepf) |
| return; |
| |
| INT_OFF; |
| if (pf->pf_fd >= 0) |
| close(pf->pf_fd); |
| free(pf->buf); |
| while (pf->strpush) |
| popstring(); |
| g_parsefile = pf->prev; |
| free(pf); |
| INT_ON; |
| } |
| |
| /* |
| * Return to top level. |
| */ |
| static void |
| popallfiles(void) |
| { |
| while (g_parsefile != &basepf) |
| popfile(); |
| } |
| |
| /* |
| * Close the file(s) that the shell is reading commands from. Called |
| * after a fork is done. |
| */ |
| static void |
| closescript(void) |
| { |
| popallfiles(); |
| if (g_parsefile->pf_fd > 0) { |
| close(g_parsefile->pf_fd); |
| g_parsefile->pf_fd = 0; |
| } |
| } |
| |
| /* |
| * Like setinputfile, but takes an open file descriptor. Call this with |
| * interrupts off. |
| */ |
| static void |
| setinputfd(int fd, int push) |
| { |
| if (push) { |
| pushfile(); |
| g_parsefile->buf = NULL; |
| } |
| g_parsefile->pf_fd = fd; |
| if (g_parsefile->buf == NULL) |
| g_parsefile->buf = ckmalloc(IBUFSIZ); |
| g_parsefile->left_in_buffer = 0; |
| g_parsefile->left_in_line = 0; |
| g_parsefile->linno = 1; |
| } |
| |
| /* |
| * Set the input to take input from a file. If push is set, push the |
| * old input onto the stack first. |
| */ |
| static int |
| setinputfile(const char *fname, int flags) |
| { |
| int fd; |
| |
| INT_OFF; |
| fd = open(fname, O_RDONLY); |
| if (fd < 0) { |
| if (flags & INPUT_NOFILE_OK) |
| goto out; |
| exitstatus = 127; |
| ash_msg_and_raise_error("can't open '%s'", fname); |
| } |
| if (fd < 10) |
| fd = savefd(fd); |
| else |
| close_on_exec_on(fd); |
| setinputfd(fd, flags & INPUT_PUSH_FILE); |
| out: |
| INT_ON; |
| return fd; |
| } |
| |
| /* |
| * Like setinputfile, but takes input from a string. |
| */ |
| static void |
| setinputstring(char *string) |
| { |
| INT_OFF; |
| pushfile(); |
| g_parsefile->next_to_pgetc = string; |
| g_parsefile->left_in_line = strlen(string); |
| g_parsefile->buf = NULL; |
| g_parsefile->linno = 1; |
| INT_ON; |
| } |
| |
| |
| /* |
| * Routines to check for mail. |
| */ |
| |
| #if ENABLE_ASH_MAIL |
| |
| /* Hash of mtimes of mailboxes */ |
| static unsigned mailtime_hash; |
| /* Set if MAIL or MAILPATH is changed. */ |
| static smallint mail_var_path_changed; |
| |
| /* |
| * Print appropriate message(s) if mail has arrived. |
| * If mail_var_path_changed is set, |
| * then the value of MAIL has mail_var_path_changed, |
| * so we just update the values. |
| */ |
| static void |
| chkmail(void) |
| { |
| const char *mpath; |
| char *p; |
| char *q; |
| unsigned new_hash; |
| struct stackmark smark; |
| struct stat statb; |
| |
| setstackmark(&smark); |
| mpath = mpathset() ? mpathval() : mailval(); |
| new_hash = 0; |
| for (;;) { |
| p = path_advance(&mpath, nullstr); |
| if (p == NULL) |
| break; |
| if (*p == '\0') |
| continue; |
| for (q = p; *q; q++) |
| continue; |
| #if DEBUG |
| if (q[-1] != '/') |
| abort(); |
| #endif |
| q[-1] = '\0'; /* delete trailing '/' */ |
| if (stat(p, &statb) < 0) { |
| continue; |
| } |
| /* Very simplistic "hash": just a sum of all mtimes */ |
| new_hash += (unsigned)statb.st_mtime; |
| } |
| if (!mail_var_path_changed && mailtime_hash != new_hash) { |
| if (mailtime_hash != 0) |
| out2str("you have mail\n"); |
| mailtime_hash = new_hash; |
| } |
| mail_var_path_changed = 0; |
| popstackmark(&smark); |
| } |
| |
| static void FAST_FUNC |
| changemail(const char *val UNUSED_PARAM) |
| { |
| mail_var_path_changed = 1; |
| } |
| |
| #endif /* ASH_MAIL */ |
| |
| |
| /* ============ ??? */ |
| |
| /* |
| * Set the shell parameters. |
| */ |
| static void |
| setparam(char **argv) |
| { |
| char **newparam; |
| char **ap; |
| int nparam; |
| |
| for (nparam = 0; argv[nparam]; nparam++) |
| continue; |
| ap = newparam = ckmalloc((nparam + 1) * sizeof(*ap)); |
| while (*argv) { |
| *ap++ = ckstrdup(*argv++); |
| } |
| *ap = NULL; |
| freeparam(&shellparam); |
| shellparam.malloced = 1; |
| shellparam.nparam = nparam; |
| shellparam.p = newparam; |
| #if ENABLE_ASH_GETOPTS |
| shellparam.optind = 1; |
| shellparam.optoff = -1; |
| #endif |
| } |
| |
| /* |
| * Process shell options. The global variable argptr contains a pointer |
| * to the argument list; we advance it past the options. |
| * |
| * SUSv3 section 2.8.1 "Consequences of Shell Errors" says: |
| * For a non-interactive shell, an error condition encountered |
| * by a special built-in ... shall cause the shell to write a diagnostic message |
| * to standard error and exit as shown in the following table: |
| * Error Special Built-In |
| * ... |
| * Utility syntax error (option or operand error) Shall exit |
| * ... |
| * However, in bug 1142 (http://busybox.net/bugs/view.php?id=1142) |
| * we see that bash does not do that (set "finishes" with error code 1 instead, |
| * and shell continues), and people rely on this behavior! |
| * Testcase: |
| * set -o barfoo 2>/dev/null |
| * echo $? |
| * |
| * Oh well. Let's mimic that. |
| */ |
| static int |
| plus_minus_o(char *name, int val) |
| { |
| int i; |
| |
| if (name) { |
| for (i = 0; i < NOPTS; i++) { |
| if (strcmp(name, optnames(i)) == 0) { |
| optlist[i] = val; |
| return 0; |
| } |
| } |
| ash_msg("illegal option %co %s", val ? '-' : '+', name); |
| return 1; |
| } |
| for (i = 0; i < NOPTS; i++) { |
| if (val) { |
| out1fmt("%-16s%s\n", optnames(i), optlist[i] ? "on" : "off"); |
| } else { |
| out1fmt("set %co %s\n", optlist[i] ? '-' : '+', optnames(i)); |
| } |
| } |
| return 0; |
| } |
| static void |
| setoption(int flag, int val) |
| { |
| int i; |
| |
| for (i = 0; i < NOPTS; i++) { |
| if (optletters(i) == flag) { |
| optlist[i] = val; |
| return; |
| } |
| } |
| ash_msg_and_raise_error("illegal option %c%c", val ? '-' : '+', flag); |
| /* NOTREACHED */ |
| } |
| static int |
| options(int cmdline) |
| { |
| char *p; |
| int val; |
| int c; |
| |
| if (cmdline) |
| minusc = NULL; |
| while ((p = *argptr) != NULL) { |
| c = *p++; |
| if (c != '-' && c != '+') |
| break; |
| argptr++; |
| val = 0; /* val = 0 if c == '+' */ |
| if (c == '-') { |
| val = 1; |
| if (p[0] == '\0' || LONE_DASH(p)) { |
| if (!cmdline) { |
| /* "-" means turn off -x and -v */ |
| if (p[0] == '\0') |
| xflag = vflag = 0; |
| /* "--" means reset params */ |
| else if (*argptr == NULL) |
| setparam(argptr); |
| } |
| break; /* "-" or "--" terminates options */ |
| } |
| } |
| /* first char was + or - */ |
| while ((c = *p++) != '\0') { |
| /* bash 3.2 indeed handles -c CMD and +c CMD the same */ |
| if (c == 'c' && cmdline) { |
| minusc = p; /* command is after shell args */ |
| } else if (c == 'o') { |
| if (plus_minus_o(*argptr, val)) { |
| /* it already printed err message */ |
| return 1; /* error */ |
| } |
| if (*argptr) |
| argptr++; |
| } else if (cmdline && (c == 'l')) { /* -l or +l == --login */ |
| isloginsh = 1; |
| /* bash does not accept +-login, we also won't */ |
| } else if (cmdline && val && (c == '-')) { /* long options */ |
| if (strcmp(p, "login") == 0) |
| isloginsh = 1; |
| break; |
| } else { |
| setoption(c, val); |
| } |
| } |
| } |
| return 0; |
| } |
| |
| /* |
| * The shift builtin command. |
| */ |
| static int FAST_FUNC |
| shiftcmd(int argc UNUSED_PARAM, char **argv) |
| { |
| int n; |
| char **ap1, **ap2; |
| |
| n = 1; |
| if (argv[1]) |
| n = number(argv[1]); |
| if (n > shellparam.nparam) |
| n = 0; /* bash compat, was = shellparam.nparam; */ |
| INT_OFF; |
| shellparam.nparam -= n; |
| for (ap1 = shellparam.p; --n >= 0; ap1++) { |
| if (shellparam.malloced) |
| free(*ap1); |
| } |
| ap2 = shellparam.p; |
| while ((*ap2++ = *ap1++) != NULL) |
| continue; |
| #if ENABLE_ASH_GETOPTS |
| shellparam.optind = 1; |
| shellparam.optoff = -1; |
| #endif |
| INT_ON; |
| return 0; |
| } |
| |
| /* |
| * POSIX requires that 'set' (but not export or readonly) output the |
| * variables in lexicographic order - by the locale's collating order (sigh). |
| * Maybe we could keep them in an ordered balanced binary tree |
| * instead of hashed lists. |
| * For now just roll 'em through qsort for printing... |
| */ |
| static int |
| showvars(const char *sep_prefix, int on, int off) |
| { |
| const char *sep; |
| char **ep, **epend; |
| |
| ep = listvars(on, off, &epend); |
| qsort(ep, epend - ep, sizeof(char *), vpcmp); |
| |
| sep = *sep_prefix ? " " : sep_prefix; |
| |
| for (; ep < epend; ep++) { |
| const char *p; |
| const char *q; |
| |
| p = strchrnul(*ep, '='); |
| q = nullstr; |
| if (*p) |
| q = single_quote(++p); |
| out1fmt("%s%s%.*s%s\n", sep_prefix, sep, (int)(p - *ep), *ep, q); |
| } |
| return 0; |
| } |
| |
| /* |
| * The set command builtin. |
| */ |
| static int FAST_FUNC |
| setcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
| { |
| int retval; |
| |
| if (!argv[1]) |
| return showvars(nullstr, 0, VUNSET); |
| |
| INT_OFF; |
| retval = options(/*cmdline:*/ 0); |
| if (retval == 0) { /* if no parse error... */ |
| optschanged(); |
| if (*argptr != NULL) { |
| setparam(argptr); |
| } |
| } |
| INT_ON; |
| return retval; |
| } |
| |
| #if ENABLE_ASH_RANDOM_SUPPORT |
| static void FAST_FUNC |
| change_random(const char *value) |
| { |
| uint32_t t; |
| |
| if (value == NULL) { |
| /* "get", generate */ |
| t = next_random(&random_gen); |
| /* set without recursion */ |
| setvar(vrandom.var_text, utoa(t), VNOFUNC); |
| vrandom.flags &= ~VNOFUNC; |
| } else { |
| /* set/reset */ |
| t = strtoul(value, NULL, 10); |
| INIT_RANDOM_T(&random_gen, (t ? t : 1), t); |
| } |
| } |
| #endif |
| |
| #if ENABLE_ASH_GETOPTS |
| static int |
| getopts(char *optstr, char *optvar, char **optfirst) |
| { |
| char *p, *q; |
| char c = '?'; |
| int done = 0; |
| char sbuf[2]; |
| char **optnext; |
| int ind = shellparam.optind; |
| int off = shellparam.optoff; |
| |
| sbuf[1] = '\0'; |
| |
| shellparam.optind = -1; |
| optnext = optfirst + ind - 1; |
| |
| if (ind <= 1 || off < 0 || (int)strlen(optnext[-1]) < off) |
| p = NULL; |
| else |
| p = optnext[-1] + off; |
| if (p == NULL || *p == '\0') { |
| /* Current word is done, advance */ |
| p = *optnext; |
| if (p == NULL || *p != '-' || *++p == '\0') { |
| atend: |
| p = NULL; |
| done = 1; |
| goto out; |
| } |
| optnext++; |
| if (LONE_DASH(p)) /* check for "--" */ |
| goto atend; |
| } |
| |
| c = *p++; |
| for (q = optstr; *q != c;) { |
| if (*q == '\0') { |
| if (optstr[0] == ':') { |
| sbuf[0] = c; |
| /*sbuf[1] = '\0'; - already is */ |
| setvar0("OPTARG", sbuf); |
| } else { |
| fprintf(stderr, "Illegal option -%c\n", c); |
| unsetvar("OPTARG"); |
| } |
| c = '?'; |
| goto out; |
| } |
| if (*++q == ':') |
| q++; |
| } |
| |
| if (*++q == ':') { |
| if (*p == '\0' && (p = *optnext) == NULL) { |
| if (optstr[0] == ':') { |
| sbuf[0] = c; |
| /*sbuf[1] = '\0'; - already is */ |
| setvar0("OPTARG", sbuf); |
| c = ':'; |
| } else { |
| fprintf(stderr, "No arg for -%c option\n", c); |
| unsetvar("OPTARG"); |
| c = '?'; |
| } |
| goto out; |
| } |
| |
| if (p == *optnext) |
| optnext++; |
| setvar0("OPTARG", p); |
| p = NULL; |
| } else |
| setvar0("OPTARG", nullstr); |
| out: |
| ind = optnext - optfirst + 1; |
| setvar("OPTIND", itoa(ind), VNOFUNC); |
| sbuf[0] = c; |
| /*sbuf[1] = '\0'; - already is */ |
| setvar0(optvar, sbuf); |
| |
| shellparam.optoff = p ? p - *(optnext - 1) : -1; |
| shellparam.optind = ind; |
| |
| return done; |
| } |
| |
| /* |
| * The getopts builtin. Shellparam.optnext points to the next argument |
| * to be processed. Shellparam.optptr points to the next character to |
| * be processed in the current argument. If shellparam.optnext is NULL, |
| * then it's the first time getopts has been called. |
| */ |
| static int FAST_FUNC |
| getoptscmd(int argc, char **argv) |
| { |
| char **optbase; |
| |
| if (argc < 3) |
| ash_msg_and_raise_error("usage: getopts optstring var [arg]"); |
| if (argc == 3) { |
| optbase = shellparam.p; |
| if ((unsigned)shellparam.optind > shellparam.nparam + 1) { |
| shellparam.optind = 1; |
| shellparam.optoff = -1; |
| } |
| } else { |
| optbase = &argv[3]; |
| if ((unsigned)shellparam.optind > argc - 2) { |
| shellparam.optind = 1; |
| shellparam.optoff = -1; |
| } |
| } |
| |
| return getopts(argv[1], argv[2], optbase); |
| } |
| #endif /* ASH_GETOPTS */ |
| |
| |
| /* ============ Shell parser */ |
| |
| struct heredoc { |
| struct heredoc *next; /* next here document in list */ |
| union node *here; /* redirection node */ |
| char *eofmark; /* string indicating end of input */ |
| smallint striptabs; /* if set, strip leading tabs */ |
| }; |
| |
| static smallint tokpushback; /* last token pushed back */ |
| static smallint quoteflag; /* set if (part of) last token was quoted */ |
| static token_id_t lasttoken; /* last token read (integer id Txxx) */ |
| static struct heredoc *heredoclist; /* list of here documents to read */ |
| static char *wordtext; /* text of last word returned by readtoken */ |
| static struct nodelist *backquotelist; |
| static union node *redirnode; |
| static struct heredoc *heredoc; |
| |
| static const char * |
| tokname(char *buf, int tok) |
| { |
| if (tok < TSEMI) |
| return tokname_array[tok]; |
| sprintf(buf, "\"%s\"", tokname_array[tok]); |
| return buf; |
| } |
| |
| /* raise_error_unexpected_syntax: |
| * Called when an unexpected token is read during the parse. The argument |
| * is the token that is expected, or -1 if more than one type of token can |
| * occur at this point. |
| */ |
| static void raise_error_unexpected_syntax(int) NORETURN; |
| static void |
| raise_error_unexpected_syntax(int token) |
| { |
| char msg[64]; |
| char buf[16]; |
| int l; |
| |
| l = sprintf(msg, "unexpected %s", tokname(buf, lasttoken)); |
| if (token >= 0) |
| sprintf(msg + l, " (expecting %s)", tokname(buf, token)); |
| raise_error_syntax(msg); |
| /* NOTREACHED */ |
| } |
| |
| #define EOFMARKLEN 79 |
| |
| /* parsing is heavily cross-recursive, need these forward decls */ |
| static union node *andor(void); |
| static union node *pipeline(void); |
| static union node *parse_command(void); |
| static void parseheredoc(void); |
| static int peektoken(void); |
| static int readtoken(void); |
| |
| static union node * |
| list(int nlflag) |
| { |
| union node *n1, *n2, *n3; |
| int tok; |
| |
| n1 = NULL; |
| for (;;) { |
| switch (peektoken()) { |
| case TNL: |
| if (!(nlflag & 1)) |
| break; |
| parseheredoc(); |
| return n1; |
| |
| case TEOF: |
| if (!n1 && (nlflag & 1)) |
| n1 = NODE_EOF; |
| parseheredoc(); |
| return n1; |
| } |
| |
| checkkwd = CHKNL | CHKKWD | CHKALIAS; |
| if (nlflag == 2 && ((1 << peektoken()) & tokendlist)) |
| return n1; |
| nlflag |= 2; |
| |
| n2 = andor(); |
| tok = readtoken(); |
| if (tok == TBACKGND) { |
| if (n2->type == NPIPE) { |
| n2->npipe.pipe_backgnd = 1; |
| } else { |
| if (n2->type != NREDIR) { |
| n3 = stzalloc(sizeof(struct nredir)); |
| n3->nredir.n = n2; |
| /*n3->nredir.redirect = NULL; - stzalloc did it */ |
| n2 = n3; |
| } |
| n2->type = NBACKGND; |
| } |
| } |
| if (n1 == NULL) { |
| n1 = n2; |
| } else { |
| n3 = stzalloc(sizeof(struct nbinary)); |
| n3->type = NSEMI; |
| n3->nbinary.ch1 = n1; |
| n3->nbinary.ch2 = n2; |
| n1 = n3; |
| } |
| switch (tok) { |
| case TNL: |
| case TEOF: |
| tokpushback = 1; |
| /* fall through */ |
| case TBACKGND: |
| case TSEMI: |
| break; |
| default: |
| if ((nlflag & 1)) |
| raise_error_unexpected_syntax(-1); |
| tokpushback = 1; |
| return n1; |
| } |
| } |
| } |
| |
| static union node * |
| andor(void) |
| { |
| union node *n1, *n2, *n3; |
| int t; |
| |
| n1 = pipeline(); |
| for (;;) { |
| t = readtoken(); |
| if (t == TAND) { |
| t = NAND; |
| } else if (t == TOR) { |
| t = NOR; |
| } else { |
| tokpushback = 1; |
| return n1; |
| } |
| checkkwd = CHKNL | CHKKWD | CHKALIAS; |
| n2 = pipeline(); |
| n3 = stzalloc(sizeof(struct nbinary)); |
| n3->type = t; |
| n3->nbinary.ch1 = n1; |
| n3->nbinary.ch2 = n2; |
| n1 = n3; |
| } |
| } |
| |
| static union node * |
| pipeline(void) |
| { |
| union node *n1, *n2, *pipenode; |
| struct nodelist *lp, *prev; |
| int negate; |
| |
| negate = 0; |
| TRACE(("pipeline: entered\n")); |
| if (readtoken() == TNOT) { |
| negate = !negate; |
| checkkwd = CHKKWD | CHKALIAS; |
| } else |
| tokpushback = 1; |
| n1 = parse_command(); |
| if (readtoken() == TPIPE) { |
| pipenode = stzalloc(sizeof(struct npipe)); |
| pipenode->type = NPIPE; |
| /*pipenode->npipe.pipe_backgnd = 0; - stzalloc did it */ |
| lp = stzalloc(sizeof(struct nodelist)); |
| pipenode->npipe.cmdlist = lp; |
| lp->n = n1; |
| do { |
| prev = lp; |
| lp = stzalloc(sizeof(struct nodelist)); |
| checkkwd = CHKNL | CHKKWD | CHKALIAS; |
| lp->n = parse_command(); |
| prev->next = lp; |
| } while (readtoken() == TPIPE); |
| lp->next = NULL; |
| n1 = pipenode; |
| } |
| tokpushback = 1; |
| if (negate) { |
| n2 = stzalloc(sizeof(struct nnot)); |
| n2->type = NNOT; |
| n2->nnot.com = n1; |
| return n2; |
| } |
| return n1; |
| } |
| |
| static union node * |
| makename(void) |
| { |
| union node *n; |
| |
| n = stzalloc(sizeof(struct narg)); |
| n->type = NARG; |
| /*n->narg.next = NULL; - stzalloc did it */ |
| n->narg.text = wordtext; |
| n->narg.backquote = backquotelist; |
| return n; |
| } |
| |
| static void |
| fixredir(union node *n, const char *text, int err) |
| { |
| int fd; |
| |
| TRACE(("Fix redir %s %d\n", text, err)); |
| if (!err) |
| n->ndup.vname = NULL; |
| |
| fd = bb_strtou(text, NULL, 10); |
| if (!errno && fd >= 0) |
| n->ndup.dupfd = fd; |
| else if (LONE_DASH(text)) |
| n->ndup.dupfd = -1; |
| else { |
| if (err) |
| raise_error_syntax("bad fd number"); |
| n->ndup.vname = makename(); |
| } |
| } |
| |
| /* |
| * Returns true if the text contains nothing to expand (no dollar signs |
| * or backquotes). |
| */ |
| static int |
| noexpand(const char *text) |
| { |
| unsigned char c; |
| |
| while ((c = *text++) != '\0') { |
| if (c == CTLQUOTEMARK) |
| continue; |
| if (c == CTLESC) |
| text++; |
| else if (SIT(c, BASESYNTAX) == CCTL) |
| return 0; |
| } |
| return 1; |
| } |
| |
| static void |
| parsefname(void) |
| { |
| union node *n = redirnode; |
| |
| if (readtoken() != TWORD) |
| raise_error_unexpected_syntax(-1); |
| if (n->type == NHERE) { |
| struct heredoc *here = heredoc; |
| struct heredoc *p; |
| int i; |
| |
| if (quoteflag == 0) |
| n->type = NXHERE; |
| TRACE(("Here document %d\n", n->type)); |
| if (!noexpand(wordtext) || (i = strlen(wordtext)) == 0 || i > EOFMARKLEN) |
| raise_error_syntax("illegal eof marker for << redirection"); |
| rmescapes(wordtext, 0); |
| here->eofmark = wordtext; |
| here->next = NULL; |
| if (heredoclist == NULL) |
| heredoclist = here; |
| else { |
| for (p = heredoclist; p->next; p = p->next) |
| continue; |
| p->next = here; |
| } |
| } else if (n->type == NTOFD || n->type == NFROMFD) { |
| fixredir(n, wordtext, 0); |
| } else { |
| n->nfile.fname = makename(); |
| } |
| } |
| |
| static union node * |
| simplecmd(void) |
| { |
| union node *args, **app; |
| union node *n = NULL; |
| union node *vars, **vpp; |
| union node **rpp, *redir; |
| int savecheckkwd; |
| #if BASH_TEST2 |
| smallint double_brackets_flag = 0; |
| #endif |
| IF_BASH_FUNCTION(smallint function_flag = 0;) |
| |
| args = NULL; |
| app = &args; |
| vars = NULL; |
| vpp = &vars; |
| redir = NULL; |
| rpp = &redir; |
| |
| savecheckkwd = CHKALIAS; |
| for (;;) { |
| int t; |
| checkkwd = savecheckkwd; |
| t = readtoken(); |
| switch (t) { |
| #if BASH_FUNCTION |
| case TFUNCTION: |
| if (peektoken() != TWORD) |
| raise_error_unexpected_syntax(TWORD); |
| function_flag = 1; |
| break; |
| #endif |
| #if BASH_TEST2 |
| case TAND: /* "&&" */ |
| case TOR: /* "||" */ |
| if (!double_brackets_flag) { |
| tokpushback = 1; |
| goto out; |
| } |
| wordtext = (char *) (t == TAND ? "-a" : "-o"); |
| #endif |
| case TWORD: |
| n = stzalloc(sizeof(struct narg)); |
| n->type = NARG; |
| /*n->narg.next = NULL; - stzalloc did it */ |
| n->narg.text = wordtext; |
| #if BASH_TEST2 |
| if (strcmp("[[", wordtext) == 0) |
| double_brackets_flag = 1; |
| else if (strcmp("]]", wordtext) == 0) |
| double_brackets_flag = 0; |
| #endif |
| n->narg.backquote = backquotelist; |
| if (savecheckkwd && isassignment(wordtext)) { |
| *vpp = n; |
| vpp = &n->narg.next; |
| } else { |
| *app = n; |
| app = &n->narg.next; |
| savecheckkwd = 0; |
| } |
| #if BASH_FUNCTION |
| if (function_flag) { |
| checkkwd = CHKNL | CHKKWD; |
| switch (peektoken()) { |
| case TBEGIN: |
| case TIF: |
| case TCASE: |
| case TUNTIL: |
| case TWHILE: |
| case TFOR: |
| goto do_func; |
| case TLP: |
| function_flag = 0; |
| break; |
| case TWORD: |
| if (strcmp("[[", wordtext) == 0) |
| goto do_func; |
| /* fall through */ |
| default: |
| raise_error_unexpected_syntax(-1); |
| } |
| } |
| #endif |
| break; |
| case TREDIR: |
| *rpp = n = redirnode; |
| rpp = &n->nfile.next; |
| parsefname(); /* read name of redirection file */ |
| break; |
| case TLP: |
| IF_BASH_FUNCTION(do_func:) |
| if (args && app == &args->narg.next |
| && !vars && !redir |
| ) { |
| struct builtincmd *bcmd; |
| const char *name; |
| |
| /* We have a function */ |
| if (IF_BASH_FUNCTION(!function_flag &&) readtoken() != TRP) |
| raise_error_unexpected_syntax(TRP); |
| name = n->narg.text; |
| if (!goodname(name) |
| || ((bcmd = find_builtin(name)) && IS_BUILTIN_SPECIAL(bcmd)) |
| ) { |
| raise_error_syntax("bad function name"); |
| } |
| n->type = NDEFUN; |
| checkkwd = CHKNL | CHKKWD | CHKALIAS; |
| n->narg.next = parse_command(); |
| return n; |
| } |
| IF_BASH_FUNCTION(function_flag = 0;) |
| /* fall through */ |
| default: |
| tokpushback = 1; |
| goto out; |
| } |
| } |
| out: |
| *app = NULL; |
| *vpp = NULL; |
| *rpp = NULL; |
| n = stzalloc(sizeof(struct ncmd)); |
| n->type = NCMD; |
| n->ncmd.args = args; |
| n->ncmd.assign = vars; |
| n->ncmd.redirect = redir; |
| return n; |
| } |
| |
| static union node * |
| parse_command(void) |
| { |
| union node *n1, *n2; |
| union node *ap, **app; |
| union node *cp, **cpp; |
| union node *redir, **rpp; |
| union node **rpp2; |
| int t; |
| |
| redir = NULL; |
| rpp2 = &redir; |
| |
| switch (readtoken()) { |
| default: |
| raise_error_unexpected_syntax(-1); |
| /* NOTREACHED */ |
| case TIF: |
| n1 = stzalloc(sizeof(struct nif)); |
| n1->type = NIF; |
| n1->nif.test = list(0); |
| if (readtoken() != TTHEN) |
| raise_error_unexpected_syntax(TTHEN); |
| n1->nif.ifpart = list(0); |
| n2 = n1; |
| while (readtoken() == TELIF) { |
| n2->nif.elsepart = stzalloc(sizeof(struct nif)); |
| n2 = n2->nif.elsepart; |
| n2->type = NIF; |
| n2->nif.test = list(0); |
| if (readtoken() != TTHEN) |
| raise_error_unexpected_syntax(TTHEN); |
| n2->nif.ifpart = list(0); |
| } |
| if (lasttoken == TELSE) |
| n2->nif.elsepart = list(0); |
| else { |
| n2->nif.elsepart = NULL; |
| tokpushback = 1; |
| } |
| t = TFI; |
| break; |
| case TWHILE: |
| case TUNTIL: { |
| int got; |
| n1 = stzalloc(sizeof(struct nbinary)); |
| n1->type = (lasttoken == TWHILE) ? NWHILE : NUNTIL; |
| n1->nbinary.ch1 = list(0); |
| got = readtoken(); |
| if (got != TDO) { |
| TRACE(("expecting DO got '%s' %s\n", tokname_array[got], |
| got == TWORD ? wordtext : "")); |
| raise_error_unexpected_syntax(TDO); |
| } |
| n1->nbinary.ch2 = list(0); |
| t = TDONE; |
| break; |
| } |
| case TFOR: |
| if (readtoken() != TWORD || quoteflag || !goodname(wordtext)) |
| raise_error_syntax("bad for loop variable"); |
| n1 = stzalloc(sizeof(struct nfor)); |
| n1->type = NFOR; |
| n1->nfor.var = wordtext; |
| checkkwd = CHKNL | CHKKWD | CHKALIAS; |
| if (readtoken() == TIN) { |
| app = ≈ |
| while (readtoken() == TWORD) { |
| n2 = stzalloc(sizeof(struct narg)); |
| n2->type = NARG; |
| /*n2->narg.next = NULL; - stzalloc did it */ |
| n2->narg.text = wordtext; |
| n2->narg.backquote = backquotelist; |
| *app = n2; |
| app = &n2->narg.next; |
| } |
| *app = NULL; |
| n1->nfor.args = ap; |
| if (lasttoken != TNL && lasttoken != TSEMI) |
| raise_error_unexpected_syntax(-1); |
| } else { |
| n2 = stzalloc(sizeof(struct narg)); |
| n2->type = NARG; |
| /*n2->narg.next = NULL; - stzalloc did it */ |
| n2->narg.text = (char *)dolatstr; |
| /*n2->narg.backquote = NULL;*/ |
| n1->nfor.args = n2; |
| /* |
| * Newline or semicolon here is optional (but note |
| * that the original Bourne shell only allowed NL). |
| */ |
| if (lasttoken != TSEMI) |
| tokpushback = 1; |
| } |
| checkkwd = CHKNL | CHKKWD | CHKALIAS; |
| if (readtoken() != TDO) |
| raise_error_unexpected_syntax(TDO); |
| n1->nfor.body = list(0); |
| t = TDONE; |
| break; |
| case TCASE: |
| n1 = stzalloc(sizeof(struct ncase)); |
| n1->type = NCASE; |
| if (readtoken() != TWORD) |
| raise_error_unexpected_syntax(TWORD); |
| n1->ncase.expr = n2 = stzalloc(sizeof(struct narg)); |
| n2->type = NARG; |
| /*n2->narg.next = NULL; - stzalloc did it */ |
| n2->narg.text = wordtext; |
| n2->narg.backquote = backquotelist; |
| checkkwd = CHKNL | CHKKWD | CHKALIAS; |
| if (readtoken() != TIN) |
| raise_error_unexpected_syntax(TIN); |
| cpp = &n1->ncase.cases; |
| next_case: |
| checkkwd = CHKNL | CHKKWD; |
| t = readtoken(); |
| while (t != TESAC) { |
| if (lasttoken == TLP) |
| readtoken(); |
| *cpp = cp = stzalloc(sizeof(struct nclist)); |
| cp->type = NCLIST; |
| app = &cp->nclist.pattern; |
| for (;;) { |
| *app = ap = stzalloc(sizeof(struct narg)); |
| ap->type = NARG; |
| /*ap->narg.next = NULL; - stzalloc did it */ |
| ap->narg.text = wordtext; |
| ap->narg.backquote = backquotelist; |
| if (readtoken() != TPIPE) |
| break; |
| app = &ap->narg.next; |
| readtoken(); |
| } |
| //ap->narg.next = NULL; |
| if (lasttoken != TRP) |
| raise_error_unexpected_syntax(TRP); |
| cp->nclist.body = list(2); |
| |
| cpp = &cp->nclist.next; |
| |
| checkkwd = CHKNL | CHKKWD; |
| t = readtoken(); |
| if (t != TESAC) { |
| if (t != TENDCASE) |
| raise_error_unexpected_syntax(TENDCASE); |
| goto next_case; |
| } |
| } |
| *cpp = NULL; |
| goto redir; |
| case TLP: |
| n1 = stzalloc(sizeof(struct nredir)); |
| n1->type = NSUBSHELL; |
| n1->nredir.n = list(0); |
| /*n1->nredir.redirect = NULL; - stzalloc did it */ |
| t = TRP; |
| break; |
| case TBEGIN: |
| n1 = list(0); |
| t = TEND; |
| break; |
| IF_BASH_FUNCTION(case TFUNCTION:) |
| case TWORD: |
| case TREDIR: |
| tokpushback = 1; |
| return simplecmd(); |
| } |
| |
| if (readtoken() != t) |
| raise_error_unexpected_syntax(t); |
| |
| redir: |
| /* Now check for redirection which may follow command */ |
| checkkwd = CHKKWD | CHKALIAS; |
| rpp = rpp2; |
| while (readtoken() == TREDIR) { |
| *rpp = n2 = redirnode; |
| rpp = &n2->nfile.next; |
| parsefname(); |
| } |
| tokpushback = 1; |
| *rpp = NULL; |
| if (redir) { |
| if (n1->type != NSUBSHELL) { |
| n2 = stzalloc(sizeof(struct nredir)); |
| n2->type = NREDIR; |
| n2->nredir.n = n1; |
| n1 = n2; |
| } |
| n1->nredir.redirect = redir; |
| } |
| return n1; |
| } |
| |
| #if BASH_DOLLAR_SQUOTE |
| static int |
| decode_dollar_squote(void) |
| { |
| static const char C_escapes[] ALIGN1 = "nrbtfav""x\\01234567"; |
| int c, cnt; |
| char *p; |
| char buf[4]; |
| |
| c = pgetc(); |
| p = strchr(C_escapes, c); |
| if (p) { |
| buf[0] = c; |
| p = buf; |
| cnt = 3; |
| if ((unsigned char)(c - '0') <= 7) { /* \ooo */ |
| do { |
| c = pgetc(); |
| *++p = c; |
| } while ((unsigned char)(c - '0') <= 7 && --cnt); |
| pungetc(); |
| } else if (c == 'x') { /* \xHH */ |
| do { |
| c = pgetc(); |
| *++p = c; |
| } while (isxdigit(c) && --cnt); |
| pungetc(); |
| if (cnt == 3) { /* \x but next char is "bad" */ |
| c = 'x'; |
| goto unrecognized; |
| } |
| } else { /* simple seq like \\ or \t */ |
| p++; |
| } |
| *p = '\0'; |
| p = buf; |
| c = bb_process_escape_sequence((void*)&p); |
| } else { /* unrecognized "\z": print both chars unless ' or " */ |
| if (c != '\'' && c != '"') { |
| unrecognized: |
| c |= 0x100; /* "please encode \, then me" */ |
| } |
| } |
| return c; |
| } |
| #endif |
| |
| /* |
| * If eofmark is NULL, read a word or a redirection symbol. If eofmark |
| * is not NULL, read a here document. In the latter case, eofmark is the |
| * word which marks the end of the document and striptabs is true if |
| * leading tabs should be stripped from the document. The argument c |
| * is the first character of the input token or document. |
| * |
| * Because C does not have internal subroutines, I have simulated them |
| * using goto's to implement the subroutine linkage. The following macros |
| * will run code that appears at the end of readtoken1. |
| */ |
| #define CHECKEND() {goto checkend; checkend_return:;} |
| #define PARSEREDIR() {goto parseredir; parseredir_return:;} |
| #define PARSESUB() {goto parsesub; parsesub_return:;} |
| #define PARSEBACKQOLD() {oldstyle = 1; goto parsebackq; parsebackq_oldreturn:;} |
| #define PARSEBACKQNEW() {oldstyle = 0; goto parsebackq; parsebackq_newreturn:;} |
| #define PARSEARITH() {goto parsearith; parsearith_return:;} |
| static int |
| readtoken1(int c, int syntax, char *eofmark, int striptabs) |
| { |
| /* NB: syntax parameter fits into smallint */ |
| /* c parameter is an unsigned char or PEOF or PEOA */ |
| char *out; |
| size_t len; |
| char line[EOFMARKLEN + 1]; |
| struct nodelist *bqlist; |
| smallint quotef; |
| smallint dblquote; |
| smallint oldstyle; |
| IF_FEATURE_SH_MATH(smallint prevsyntax;) /* syntax before arithmetic */ |
| #if ENABLE_ASH_EXPAND_PRMT |
| smallint pssyntax; /* we are expanding a prompt string */ |
| #endif |
| int varnest; /* levels of variables expansion */ |
| IF_FEATURE_SH_MATH(int arinest;) /* levels of arithmetic expansion */ |
| IF_FEATURE_SH_MATH(int parenlevel;) /* levels of parens in arithmetic */ |
| int dqvarnest; /* levels of variables expansion within double quotes */ |
| |
| IF_BASH_DOLLAR_SQUOTE(smallint bash_dollar_squote = 0;) |
| |
| startlinno = g_parsefile->linno; |
| bqlist = NULL; |
| quotef = 0; |
| IF_FEATURE_SH_MATH(prevsyntax = 0;) |
| #if ENABLE_ASH_EXPAND_PRMT |
| pssyntax = (syntax == PSSYNTAX); |
| if (pssyntax) |
| syntax = DQSYNTAX; |
| #endif |
| dblquote = (syntax == DQSYNTAX); |
| varnest = 0; |
| IF_FEATURE_SH_MATH(arinest = 0;) |
| IF_FEATURE_SH_MATH(parenlevel = 0;) |
| dqvarnest = 0; |
| |
| STARTSTACKSTR(out); |
| loop: |
| /* For each line, until end of word */ |
| CHECKEND(); /* set c to PEOF if at end of here document */ |
| for (;;) { /* until end of line or end of word */ |
| CHECKSTRSPACE(4, out); /* permit 4 calls to USTPUTC */ |
| switch (SIT(c, syntax)) { |
| case CNL: /* '\n' */ |
| if (syntax == BASESYNTAX) |
| goto endword; /* exit outer loop */ |
| USTPUTC(c, out); |
| nlprompt(); |
| c = pgetc(); |
| goto loop; /* continue outer loop */ |
| case CWORD: |
| USTPUTC(c, out); |
| break; |
| case CCTL: |
| #if BASH_DOLLAR_SQUOTE |
| if (c == '\\' && bash_dollar_squote) { |
| c = decode_dollar_squote(); |
| if (c == '\0') { |
| /* skip $'\000', $'\x00' (like bash) */ |
| break; |
| } |
| if (c & 0x100) { |
| /* Unknown escape. Encode as '\z' */ |
| c = (unsigned char)c; |
| if (eofmark == NULL || dblquote) |
| USTPUTC(CTLESC, out); |
| USTPUTC('\\', out); |
| } |
| } |
| #endif |
| if (eofmark == NULL || dblquote) |
| USTPUTC(CTLESC, out); |
| USTPUTC(c, out); |
| break; |
| case CBACK: /* backslash */ |
| c = pgetc_without_PEOA(); |
| if (c == PEOF) { |
| USTPUTC(CTLESC, out); |
| USTPUTC('\\', out); |
| pungetc(); |
| } else if (c == '\n') { |
| nlprompt(); |
| } else { |
| #if ENABLE_ASH_EXPAND_PRMT |
| if (c == '$' && pssyntax) { |
| USTPUTC(CTLESC, out); |
| USTPUTC('\\', out); |
| } |
| #endif |
| /* Backslash is retained if we are in "str" and next char isn't special */ |
| if (dblquote |
| && c != '\\' |
| && c != '`' |
| && c != '$' |
| && (c != '"' || eofmark != NULL) |
| ) { |
| USTPUTC('\\', out); |
| } |
| USTPUTC(CTLESC, out); |
| USTPUTC(c, out); |
| quotef = 1; |
| } |
| break; |
| case CSQUOTE: |
| syntax = SQSYNTAX; |
| quotemark: |
| if (eofmark == NULL) { |
| USTPUTC(CTLQUOTEMARK, out); |
| } |
| break; |
| case CDQUOTE: |
| syntax = DQSYNTAX; |
| dblquote = 1; |
| goto quotemark; |
| case CENDQUOTE: |
| IF_BASH_DOLLAR_SQUOTE(bash_dollar_squote = 0;) |
| if (eofmark != NULL && varnest == 0) { |
| USTPUTC(c, out); |
| } else { |
| if (dqvarnest == 0) { |
| syntax = BASESYNTAX; |
| dblquote = 0; |
| } |
| quotef = 1; |
| goto quotemark; |
| } |
| break; |
| case CVAR: /* '$' */ |
| PARSESUB(); /* parse substitution */ |
| break; |
| case CENDVAR: /* '}' */ |
| if (varnest > 0) { |
| varnest--; |
| if (dqvarnest > 0) { |
| dqvarnest--; |
| } |
| c = CTLENDVAR; |
| } |
| USTPUTC(c, out); |
| break; |
| #if ENABLE_FEATURE_SH_MATH |
| case CLP: /* '(' in arithmetic */ |
| parenlevel++; |
| USTPUTC(c, out); |
| break; |
| case CRP: /* ')' in arithmetic */ |
| if (parenlevel > 0) { |
| parenlevel--; |
| } else { |
| if (pgetc_eatbnl() == ')') { |
| c = CTLENDARI; |
| if (--arinest == 0) { |
| syntax = prevsyntax; |
| } |
| } else { |
| /* |
| * unbalanced parens |
| * (don't 2nd guess - no error) |
| */ |
| pungetc(); |
| } |
| } |
| USTPUTC(c, out); |
| break; |
| #endif |
| case CBQUOTE: /* '`' */ |
| PARSEBACKQOLD(); |
| break; |
| case CENDFILE: |
| goto endword; /* exit outer loop */ |
| case CIGN: |
| break; |
| default: |
| if (varnest == 0) { |
| #if BASH_REDIR_OUTPUT |
| if (c == '&') { |
| //Can't call pgetc_eatbnl() here, this requires three-deep pungetc() |
| if (pgetc() == '>') |
| c = 0x100 + '>'; /* flag &> */ |
| pungetc(); |
| } |
| #endif |
| goto endword; /* exit outer loop */ |
| } |
| IF_ASH_ALIAS(if (c != PEOA)) |
| USTPUTC(c, out); |
| } |
| c = pgetc(); |
| } /* for (;;) */ |
| endword: |
| |
| #if ENABLE_FEATURE_SH_MATH |
| if (syntax == ARISYNTAX) |
| raise_error_syntax("missing '))'"); |
| #endif |
| if (syntax != BASESYNTAX && eofmark == NULL) |
| raise_error_syntax("unterminated quoted string"); |
| if (varnest != 0) { |
| startlinno = g_parsefile->linno; |
| /* { */ |
| raise_error_syntax("missing '}'"); |
| } |
| USTPUTC('\0', out); |
| len = out - (char *)stackblock(); |
| out = stackblock(); |
| if (eofmark == NULL) { |
| if ((c == '>' || c == '<' IF_BASH_REDIR_OUTPUT( || c == 0x100 + '>')) |
| && quotef == 0 |
| ) { |
| if (isdigit_str9(out)) { |
| PARSEREDIR(); /* passed as params: out, c */ |
| lasttoken = TREDIR; |
| return lasttoken; |
| } |
| /* else: non-number X seen, interpret it |
| * as "NNNX>file" = "NNNX >file" */ |
| } |
| pungetc(); |
| } |
| quoteflag = quotef; |
| backquotelist = bqlist; |
| grabstackblock(len); |
| wordtext = out; |
| lasttoken = TWORD; |
| return lasttoken; |
| /* end of readtoken routine */ |
| |
| /* |
| * Check to see whether we are at the end of the here document. When this |
| * is called, c is set to the first character of the next input line. If |
| * we are at the end of the here document, this routine sets the c to PEOF. |
| */ |
| checkend: { |
| if (eofmark) { |
| #if ENABLE_ASH_ALIAS |
| if (c == PEOA) |
| c = pgetc_without_PEOA(); |
| #endif |
| if (striptabs) { |
| while (c == '\t') { |
| c = pgetc_without_PEOA(); |
| } |
| } |
| if (c == *eofmark) { |
| if (pfgets(line, sizeof(line)) != NULL) { |
| char *p, *q; |
| int cc; |
| |
| p = line; |
| for (q = eofmark + 1;; p++, q++) { |
| cc = *p; |
| if (cc == '\n') |
| cc = 0; |
| if (!*q || cc != *q) |
| break; |
| } |
| if (cc == *q) { |
| c = PEOF; |
| nlnoprompt(); |
| } else { |
| pushstring(line, NULL); |
| } |
| } |
| } |
| } |
| goto checkend_return; |
| } |
| |
| /* |
| * Parse a redirection operator. The variable "out" points to a string |
| * specifying the fd to be redirected. The variable "c" contains the |
| * first character of the redirection operator. |
| */ |
| parseredir: { |
| /* out is already checked to be a valid number or "" */ |
| int fd = (*out == '\0' ? -1 : atoi(out)); |
| union node *np; |
| |
| np = stzalloc(sizeof(struct nfile)); |
| if (c == '>') { |
| np->nfile.fd = 1; |
| c = pgetc(); |
| if (c == '>') |
| np->type = NAPPEND; |
| else if (c == '|') |
| np->type = NCLOBBER; |
| else if (c == '&') |
| np->type = NTOFD; |
| /* it also can be NTO2 (>&file), but we can't figure it out yet */ |
| else { |
| np->type = NTO; |
| pungetc(); |
| } |
| } |
| #if BASH_REDIR_OUTPUT |
| else if (c == 0x100 + '>') { /* this flags &> redirection */ |
| np->nfile.fd = 1; |
| pgetc(); /* this is '>', no need to check */ |
| np->type = NTO2; |
| } |
| #endif |
| else { /* c == '<' */ |
| /*np->nfile.fd = 0; - stzalloc did it */ |
| c = pgetc(); |
| switch (c) { |
| case '<': |
| if (sizeof(struct nfile) != sizeof(struct nhere)) { |
| np = stzalloc(sizeof(struct nhere)); |
| /*np->nfile.fd = 0; - stzalloc did it */ |
| } |
| np->type = NHERE; |
| heredoc = stzalloc(sizeof(struct heredoc)); |
| heredoc->here = np; |
| c = pgetc(); |
| if (c == '-') { |
| heredoc->striptabs = 1; |
| } else { |
| /*heredoc->striptabs = 0; - stzalloc did it */ |
| pungetc(); |
| } |
| break; |
| |
| case '&': |
| np->type = NFROMFD; |
| break; |
| |
| case '>': |
| np->type = NFROMTO; |
| break; |
| |
| default: |
| np->type = NFROM; |
| pungetc(); |
| break; |
| } |
| } |
| if (fd >= 0) |
| np->nfile.fd = fd; |
| redirnode = np; |
| goto parseredir_return; |
| } |
| |
| /* |
| * Parse a substitution. At this point, we have read the dollar sign |
| * and nothing else. |
| */ |
| |
| /* is_special(c) evaluates to 1 for c in "!#$*-0123456789?@"; 0 otherwise |
| * (assuming ascii char codes, as the original implementation did) */ |
| #define is_special(c) \ |
| (((unsigned)(c) - 33 < 32) \ |
| && ((0xc1ff920dU >> ((unsigned)(c) - 33)) & 1)) |
| parsesub: { |
| unsigned char subtype; |
| int typeloc; |
| |
| c = pgetc_eatbnl(); |
| if (c > 255 /* PEOA or PEOF */ |
| || (c != '(' && c != '{' && !is_name(c) && !is_special(c)) |
| ) { |
| #if BASH_DOLLAR_SQUOTE |
| if (syntax != DQSYNTAX && c == '\'') |
| bash_dollar_squote = 1; |
| else |
| #endif |
| USTPUTC('$', out); |
| pungetc(); |
| } else if (c == '(') { |
| /* $(command) or $((arith)) */ |
| if (pgetc_eatbnl() == '(') { |
| #if ENABLE_FEATURE_SH_MATH |
| PARSEARITH(); |
| #else |
| raise_error_syntax("you disabled math support for $((arith)) syntax"); |
| #endif |
| } else { |
| pungetc(); |
| PARSEBACKQNEW(); |
| } |
| } else { |
| /* $VAR, $<specialchar>, ${...}, or PEOA/PEOF */ |
| USTPUTC(CTLVAR, out); |
| typeloc = out - (char *)stackblock(); |
| STADJUST(1, out); |
| subtype = VSNORMAL; |
| if (c == '{') { |
| c = pgetc_eatbnl(); |
| subtype = 0; |
| } |
| varname: |
| if (is_name(c)) { |
| /* $[{[#]]NAME[}] */ |
| do { |
| STPUTC(c, out); |
| c = pgetc_eatbnl(); |
| } while (is_in_name(c)); |
| } else if (isdigit(c)) { |
| /* $[{[#]]NUM[}] */ |
| do { |
| STPUTC(c, out); |
| c = pgetc_eatbnl(); |
| } while (isdigit(c)); |
| } else if (is_special(c)) { |
| /* $[{[#]]<specialchar>[}] */ |
| int cc = c; |
| |
| c = pgetc_eatbnl(); |
| if (!subtype && cc == '#') { |
| subtype = VSLENGTH; |
| if (c == '_' || isalnum(c)) |
| goto varname; |
| cc = c; |
| c = pgetc_eatbnl(); |
| if (cc == '}' || c != '}') { |
| pungetc(); |
| subtype = 0; |
| c = cc; |
| cc = '#'; |
| } |
| } |
| USTPUTC(cc, out); |
| } else { |
| goto badsub; |
| } |
| if (c != '}' && subtype == VSLENGTH) { |
| /* ${#VAR didn't end with } */ |
| goto badsub; |
| } |
| |
| if (subtype == 0) { |
| static const char types[] ALIGN1 = "}-+?="; |
| /* ${VAR...} but not $VAR or ${#VAR} */ |
| /* c == first char after VAR */ |
| switch (c) { |
| case ':': |
| c = pgetc_eatbnl(); |
| #if BASH_SUBSTR |
| /* This check is only needed to not misinterpret |
| * ${VAR:-WORD}, ${VAR:+WORD}, ${VAR:=WORD}, ${VAR:?WORD} |
| * constructs. |
| */ |
| if (!strchr(types, c)) { |
| subtype = VSSUBSTR; |
| pungetc(); |
| break; /* "goto badsub" is bigger (!) */ |
| } |
| #endif |
| subtype = VSNUL; |
| /*FALLTHROUGH*/ |
| default: { |
| const char *p = strchr(types, c); |
| if (p == NULL) |
| break; |
| subtype |= p - types + VSNORMAL; |
| break; |
| } |
| case '%': |
| case '#': { |
| int cc = c; |
| subtype = (c == '#' ? VSTRIMLEFT : VSTRIMRIGHT); |
| c = pgetc_eatbnl(); |
| if (c != cc) |
| goto badsub; |
| subtype++; |
| break; |
| } |
| #if BASH_PATTERN_SUBST |
| case '/': |
| /* ${v/[/]pattern/repl} */ |
| //TODO: encode pattern and repl separately. |
| // Currently ${v/$var_with_slash/repl} is horribly broken |
| subtype = VSREPLACE; |
| c = pgetc_eatbnl(); |
| if (c != '/') |
| goto badsub; |
| subtype++; /* VSREPLACEALL */ |
| break; |
| #endif |
| } |
| } else { |
| badsub: |
| pungetc(); |
| } |
| ((unsigned char *)stackblock())[typeloc] = subtype; |
| if (subtype != VSNORMAL) { |
| varnest++; |
| if (dblquote) |
| dqvarnest++; |
| } |
| STPUTC('=', out); |
| } |
| goto parsesub_return; |
| } |
| |
| /* |
| * Called to parse command substitutions. Newstyle is set if the command |
| * is enclosed inside $(...); nlpp is a pointer to the head of the linked |
| * list of commands (passed by reference), and savelen is the number of |
| * characters on the top of the stack which must be preserved. |
| */ |
| parsebackq: { |
| struct nodelist **nlpp; |
| union node *n; |
| char *str; |
| size_t savelen; |
| smallint saveprompt = 0; |
| |
| str = NULL; |
| savelen = out - (char *)stackblock(); |
| if (savelen > 0) { |
| /* |
| * FIXME: this can allocate very large block on stack and SEGV. |
| * Example: |
| * echo "..<100kbytes>..`true` $(true) `true` ..." |
| * allocates 100kb for every command subst. With about |
| * a hundred command substitutions stack overflows. |
| * With larger prepended string, SEGV happens sooner. |
| */ |
| str = alloca(savelen); |
| memcpy(str, stackblock(), savelen); |
| } |
| |
| if (oldstyle) { |
| /* We must read until the closing backquote, giving special |
| * treatment to some slashes, and then push the string and |
| * reread it as input, interpreting it normally. |
| */ |
| char *pout; |
| size_t psavelen; |
| char *pstr; |
| |
| STARTSTACKSTR(pout); |
| for (;;) { |
| int pc; |
| |
| setprompt_if(needprompt, 2); |
| pc = pgetc(); |
| switch (pc) { |
| case '`': |
| goto done; |
| |
| case '\\': |
| pc = pgetc(); |
| if (pc == '\n') { |
| nlprompt(); |
| /* |
| * If eating a newline, avoid putting |
| * the newline into the new character |
| * stream (via the STPUTC after the |
| * switch). |
| */ |
| continue; |
| } |
| if (pc != '\\' && pc != '`' && pc != '$' |
| && (!dblquote || pc != '"') |
| ) { |
| STPUTC('\\', pout); |
| } |
| if (pc <= 255 /* not PEOA or PEOF */) { |
| break; |
| } |
| /* fall through */ |
| |
| case PEOF: |
| IF_ASH_ALIAS(case PEOA:) |
| startlinno = g_parsefile->linno; |
| raise_error_syntax("EOF in backquote substitution"); |
| |
| case '\n': |
| nlnoprompt(); |
| break; |
| |
| default: |
| break; |
| } |
| STPUTC(pc, pout); |
| } |
| done: |
| STPUTC('\0', pout); |
| psavelen = pout - (char *)stackblock(); |
| if (psavelen > 0) { |
| pstr = grabstackstr(pout); |
| setinputstring(pstr); |
| } |
| } |
| nlpp = &bqlist; |
| while (*nlpp) |
| nlpp = &(*nlpp)->next; |
| *nlpp = stzalloc(sizeof(**nlpp)); |
| /* (*nlpp)->next = NULL; - stzalloc did it */ |
| |
| if (oldstyle) { |
| saveprompt = doprompt; |
| doprompt = 0; |
| } |
| |
| n = list(2); |
| |
| if (oldstyle) |
| doprompt = saveprompt; |
| else if (readtoken() != TRP) |
| raise_error_unexpected_syntax(TRP); |
| |
| (*nlpp)->n = n; |
| if (oldstyle) { |
| /* |
| * Start reading from old file again, ignoring any pushed back |
| * tokens left from the backquote parsing |
| */ |
| popfile(); |
| tokpushback = 0; |
| } |
| while (stackblocksize() <= savelen) |
| growstackblock(); |
| STARTSTACKSTR(out); |
| if (str) { |
| memcpy(out, str, savelen); |
| STADJUST(savelen, out); |
| } |
| USTPUTC(CTLBACKQ, out); |
| if (oldstyle) |
| goto parsebackq_oldreturn; |
| goto parsebackq_newreturn; |
| } |
| |
| #if ENABLE_FEATURE_SH_MATH |
| /* |
| * Parse an arithmetic expansion (indicate start of one and set state) |
| */ |
| parsearith: { |
| if (++arinest == 1) { |
| prevsyntax = syntax; |
| syntax = ARISYNTAX; |
| } |
| USTPUTC(CTLARI, out); |
| goto parsearith_return; |
| } |
| #endif |
| } /* end of readtoken */ |
| |
| /* |
| * Read the next input token. |
| * If the token is a word, we set backquotelist to the list of cmds in |
| * backquotes. We set quoteflag to true if any part of the word was |
| * quoted. |
| * If the token is TREDIR, then we set redirnode to a structure containing |
| * the redirection. |
| * In all cases, the variable startlinno is set to the number of the line |
| * on which the token starts. |
| * |
| * [Change comment: here documents and internal procedures] |
| * [Readtoken shouldn't have any arguments. Perhaps we should make the |
| * word parsing code into a separate routine. In this case, readtoken |
| * doesn't need to have any internal procedures, but parseword does. |
| * We could also make parseoperator in essence the main routine, and |
| * have parseword (readtoken1?) handle both words and redirection.] |
| */ |
| #define NEW_xxreadtoken |
| #ifdef NEW_xxreadtoken |
| /* singles must be first! */ |
| static const char xxreadtoken_chars[7] ALIGN1 = { |
| '\n', '(', ')', /* singles */ |
| '&', '|', ';', /* doubles */ |
| 0 |
| }; |
| |
| #define xxreadtoken_singles 3 |
| #define xxreadtoken_doubles 3 |
| |
| static const char xxreadtoken_tokens[] ALIGN1 = { |
| TNL, TLP, TRP, /* only single occurrence allowed */ |
| TBACKGND, TPIPE, TSEMI, /* if single occurrence */ |
| TEOF, /* corresponds to trailing nul */ |
| TAND, TOR, TENDCASE /* if double occurrence */ |
| }; |
| |
| static int |
| xxreadtoken(void) |
| { |
| int c; |
| |
| if (tokpushback) { |
| tokpushback = 0; |
| return lasttoken; |
| } |
| setprompt_if(needprompt, 2); |
| startlinno = g_parsefile->linno; |
| for (;;) { /* until token or start of word found */ |
| c = pgetc(); |
| if (c == ' ' || c == '\t' IF_ASH_ALIAS( || c == PEOA)) |
| continue; |
| |
| if (c == '#') { |
| while ((c = pgetc()) != '\n' && c != PEOF) |
| continue; |
| pungetc(); |
| } else if (c == '\\') { |
| if (pgetc() != '\n') { |
| pungetc(); |
| break; /* return readtoken1(...) */ |
| } |
| nlprompt(); |
| } else { |
| const char *p; |
| |
| p = xxreadtoken_chars + sizeof(xxreadtoken_chars) - 1; |
| if (c != PEOF) { |
| if (c == '\n') { |
| nlnoprompt(); |
| } |
| |
| p = strchr(xxreadtoken_chars, c); |
| if (p == NULL) |
| break; /* return readtoken1(...) */ |
| |
| if ((int)(p - xxreadtoken_chars) >= xxreadtoken_singles) { |
| int cc = pgetc(); |
| if (cc == c) { /* double occurrence? */ |
| p += xxreadtoken_doubles + 1; |
| } else { |
| pungetc(); |
| #if BASH_REDIR_OUTPUT |
| if (c == '&' && cc == '>') /* &> */ |
| break; /* return readtoken1(...) */ |
| #endif |
| } |
| } |
| } |
| lasttoken = xxreadtoken_tokens[p - xxreadtoken_chars]; |
| return lasttoken; |
| } |
| } /* for (;;) */ |
| |
| return readtoken1(c, BASESYNTAX, (char *) NULL, 0); |
| } |
| #else /* old xxreadtoken */ |
| #define RETURN(token) return lasttoken = token |
| static int |
| xxreadtoken(void) |
| { |
| int c; |
| |
| if (tokpushback) { |
| tokpushback = 0; |
| return lasttoken; |
| } |
| setprompt_if(needprompt, 2); |
| startlinno = g_parsefile->linno; |
| for (;;) { /* until token or start of word found */ |
| c = pgetc(); |
| switch (c) { |
| case ' ': case '\t': |
| IF_ASH_ALIAS(case PEOA:) |
| continue; |
| case '#': |
| while ((c = pgetc()) != '\n' && c != PEOF) |
| continue; |
| pungetc(); |
| continue; |
| case '\\': |
| if (pgetc() == '\n') { |
| nlprompt(); |
| continue; |
| } |
| pungetc(); |
| goto breakloop; |
| case '\n': |
| nlnoprompt(); |
| RETURN(TNL); |
| case PEOF: |
| RETURN(TEOF); |
| case '&': |
| if (pgetc() == '&') |
| RETURN(TAND); |
| pungetc(); |
| RETURN(TBACKGND); |
| case '|': |
| if (pgetc() == '|') |
| RETURN(TOR); |
| pungetc(); |
| RETURN(TPIPE); |
| case ';': |
| if (pgetc() == ';') |
| RETURN(TENDCASE); |
| pungetc(); |
| RETURN(TSEMI); |
| case '(': |
| RETURN(TLP); |
| case ')': |
| RETURN(TRP); |
| default: |
| goto breakloop; |
| } |
| } |
| breakloop: |
| return readtoken1(c, BASESYNTAX, (char *)NULL, 0); |
| #undef RETURN |
| } |
| #endif /* old xxreadtoken */ |
| |
| static int |
| readtoken(void) |
| { |
| int t; |
| int kwd = checkkwd; |
| #if DEBUG |
| smallint alreadyseen = tokpushback; |
| #endif |
| |
| #if ENABLE_ASH_ALIAS |
| top: |
| #endif |
| |
| t = xxreadtoken(); |
| |
| /* |
| * eat newlines |
| */ |
| if (kwd & CHKNL) { |
| while (t == TNL) { |
| parseheredoc(); |
| t = xxreadtoken(); |
| } |
| } |
| |
| if (t != TWORD || quoteflag) { |
| goto out; |
| } |
| |
| /* |
| * check for keywords |
| */ |
| if (kwd & CHKKWD) { |
| const char *const *pp; |
| |
| pp = findkwd(wordtext); |
| if (pp) { |
| lasttoken = t = pp - tokname_array; |
| TRACE(("keyword '%s' recognized\n", tokname_array[t])); |
| goto out; |
| } |
| } |
| |
| if (checkkwd & CHKALIAS) { |
| #if ENABLE_ASH_ALIAS |
| struct alias *ap; |
| ap = lookupalias(wordtext, 1); |
| if (ap != NULL) { |
| if (*ap->val) { |
| pushstring(ap->val, ap); |
| } |
| goto top; |
| } |
| #endif |
| } |
| out: |
| checkkwd = 0; |
| #if DEBUG |
| if (!alreadyseen) |
| TRACE(("token '%s' %s\n", tokname_array[t], t == TWORD ? wordtext : "")); |
| else |
| TRACE(("reread token '%s' %s\n", tokname_array[t], t == TWORD ? wordtext : "")); |
| #endif |
| return t; |
| } |
| |
| static int |
| peektoken(void) |
| { |
| int t; |
| |
| t = readtoken(); |
| tokpushback = 1; |
| return t; |
| } |
| |
| /* |
| * Read and parse a command. Returns NODE_EOF on end of file. |
| * (NULL is a valid parse tree indicating a blank line.) |
| */ |
| static union node * |
| parsecmd(int interact) |
| { |
| tokpushback = 0; |
| checkkwd = 0; |
| heredoclist = 0; |
| doprompt = interact; |
| setprompt_if(doprompt, doprompt); |
| needprompt = 0; |
| return list(1); |
| } |
| |
| /* |
| * Input any here documents. |
| */ |
| static void |
| parseheredoc(void) |
| { |
| struct heredoc *here; |
| union node *n; |
| |
| here = heredoclist; |
| heredoclist = NULL; |
| |
| while (here) { |
| setprompt_if(needprompt, 2); |
| readtoken1(pgetc(), here->here->type == NHERE ? SQSYNTAX : DQSYNTAX, |
| here->eofmark, here->striptabs); |
| n = stzalloc(sizeof(struct narg)); |
| n->narg.type = NARG; |
| /*n->narg.next = NULL; - stzalloc did it */ |
| n->narg.text = wordtext; |
| n->narg.backquote = backquotelist; |
| here->here->nhere.doc = n; |
| here = here->next; |
| } |
| } |
| |
| |
| /* |
| * called by editline -- any expansions to the prompt should be added here. |
| */ |
| static const char * |
| expandstr(const char *ps) |
| { |
| union node n; |
| int saveprompt; |
| |
| /* XXX Fix (char *) cast. It _is_ a bug. ps is variable's value, |
| * and token processing _can_ alter it (delete NULs etc). */ |
| setinputstring((char *)ps); |
| |
| saveprompt = doprompt; |
| doprompt = 0; |
| readtoken1(pgetc(), PSSYNTAX, nullstr, 0); |
| doprompt = saveprompt; |
| |
| popfile(); |
| |
| n.narg.type = NARG; |
| n.narg.next = NULL; |
| n.narg.text = wordtext; |
| n.narg.backquote = backquotelist; |
| |
| expandarg(&n, NULL, EXP_QUOTED); |
| return stackblock(); |
| } |
| |
| /* |
| * Execute a command or commands contained in a string. |
| */ |
| static int |
| evalstring(char *s, int flags) |
| { |
| struct jmploc *volatile savehandler; |
| struct jmploc jmploc; |
| int ex; |
| |
| union node *n; |
| struct stackmark smark; |
| int status; |
| |
| s = sstrdup(s); |
| setinputstring(s); |
| setstackmark(&smark); |
| |
| status = 0; |
| /* On exception inside execution loop, we must popfile(). |
| * Try interactively: |
| * readonly a=a |
| * command eval "a=b" # throws "is read only" error |
| * "command BLTIN" is not supposed to abort (even in non-interactive use). |
| * But if we skip popfile(), we hit EOF in eval's string, and exit. |
| */ |
| savehandler = exception_handler; |
| ex = setjmp(jmploc.loc); |
| if (ex) |
| goto out; |
| exception_handler = &jmploc; |
| |
| while ((n = parsecmd(0)) != NODE_EOF) { |
| int i; |
| |
| i = evaltree(n, flags); |
| if (n) |
| status = i; |
| popstackmark(&smark); |
| if (evalskip) |
| break; |
| } |
| out: |
| popstackmark(&smark); |
| popfile(); |
| stunalloc(s); |
| |
| exception_handler = savehandler; |
| if (ex) |
| longjmp(exception_handler->loc, ex); |
| |
| return status; |
| } |
| |
| /* |
| * The eval command. |
| */ |
| static int FAST_FUNC |
| evalcmd(int argc UNUSED_PARAM, char **argv, int flags) |
| { |
| char *p; |
| char *concat; |
| |
| if (argv[1]) { |
| p = argv[1]; |
| argv += 2; |
| if (argv[0]) { |
| STARTSTACKSTR(concat); |
| for (;;) { |
| concat = stack_putstr(p, concat); |
| p = *argv++; |
| if (p == NULL) |
| break; |
| STPUTC(' ', concat); |
| } |
| STPUTC('\0', concat); |
| p = grabstackstr(concat); |
| } |
| return evalstring(p, flags & EV_TESTED); |
| } |
| return 0; |
| } |
| |
| /* |
| * Read and execute commands. |
| * "Top" is nonzero for the top level command loop; |
| * it turns on prompting if the shell is interactive. |
| */ |
| static int |
| cmdloop(int top) |
| { |
| union node *n; |
| struct stackmark smark; |
| int inter; |
| int status = 0; |
| int numeof = 0; |
| |
| TRACE(("cmdloop(%d) called\n", top)); |
| for (;;) { |
| int skip; |
| |
| setstackmark(&smark); |
| #if JOBS |
| if (doing_jobctl) |
| showjobs(SHOW_CHANGED|SHOW_STDERR); |
| #endif |
| inter = 0; |
| if (iflag && top) { |
| inter++; |
| chkmail(); |
| } |
| n = parsecmd(inter); |
| #if DEBUG |
| if (DEBUG > 2 && debug && (n != NODE_EOF)) |
| showtree(n); |
| #endif |
| if (n == NODE_EOF) { |
| if (!top || numeof >= 50) |
| break; |
| if (!stoppedjobs()) { |
| if (!Iflag) |
| break; |
| out2str("\nUse \"exit\" to leave shell.\n"); |
| } |
| numeof++; |
| } else if (nflag == 0) { |
| int i; |
| |
| /* job_warning can only be 2,1,0. Here 2->1, 1/0->0 */ |
| job_warning >>= 1; |
| numeof = 0; |
| i = evaltree(n, 0); |
| if (n) |
| status = i; |
| } |
| popstackmark(&smark); |
| skip = evalskip; |
| |
| if (skip) { |
| evalskip &= ~SKIPFUNC; |
| break; |
| } |
| } |
| return status; |
| } |
| |
| /* |
| * Take commands from a file. To be compatible we should do a path |
| * search for the file, which is necessary to find sub-commands. |
| */ |
| static char * |
| find_dot_file(char *name) |
| { |
| char *fullname; |
| const char *path = pathval(); |
| struct stat statb; |
| |
| /* don't try this for absolute or relative paths */ |
| if (strchr(name, '/')) |
| return name; |
| |
| while ((fullname = path_advance(&path, name)) != NULL) { |
| if ((stat(fullname, &statb) == 0) && S_ISREG(statb.st_mode)) { |
| /* |
| * Don't bother freeing here, since it will |
| * be freed by the caller. |
| */ |
| return fullname; |
| } |
| if (fullname != name) |
| stunalloc(fullname); |
| } |
| |
| /* not found in the PATH */ |
| ash_msg_and_raise_error("%s: not found", name); |
| /* NOTREACHED */ |
| } |
| |
| static int FAST_FUNC |
| dotcmd(int argc_ UNUSED_PARAM, char **argv_ UNUSED_PARAM) |
| { |
| /* "false; . empty_file; echo $?" should print 0, not 1: */ |
| int status = 0; |
| char *fullname; |
| char **argv; |
| char *args_need_save; |
| struct strlist *sp; |
| volatile struct shparam saveparam; |
| |
| for (sp = cmdenviron; sp; sp = sp->next) |
| setvareq(ckstrdup(sp->text), VSTRFIXED | VTEXTFIXED); |
| |
| nextopt(nullstr); /* handle possible "--" */ |
| argv = argptr; |
| |
| if (!argv[0]) { |
| /* bash says: "bash: .: filename argument required" */ |
| return 2; /* bash compat */ |
| } |
| |
| /* This aborts if file isn't found, which is POSIXly correct. |
| * bash returns exitcode 1 instead. |
| */ |
| fullname = find_dot_file(argv[0]); |
| argv++; |
| args_need_save = argv[0]; |
| if (args_need_save) { /* ". FILE ARGS", and ARGS are not empty */ |
| int argc; |
| saveparam = shellparam; |
| shellparam.malloced = 0; |
| argc = 1; |
| while (argv[argc]) |
| argc++; |
| shellparam.nparam = argc; |
| shellparam.p = argv; |
| }; |
| |
| /* This aborts if file can't be opened, which is POSIXly correct. |
| * bash returns exitcode 1 instead. |
| */ |
| setinputfile(fullname, INPUT_PUSH_FILE); |
| commandname = fullname; |
| status = cmdloop(0); |
| popfile(); |
| |
| if (args_need_save) { |
| freeparam(&shellparam); |
| shellparam = saveparam; |
| }; |
| |
| return status; |
| } |
| |
| static int FAST_FUNC |
| exitcmd(int argc UNUSED_PARAM, char **argv) |
| { |
| if (stoppedjobs()) |
| return 0; |
| if (argv[1]) |
| exitstatus = number(argv[1]); |
| raise_exception(EXEXIT); |
| /* NOTREACHED */ |
| } |
| |
| /* |
| * Read a file containing shell functions. |
| */ |
| static void |
| readcmdfile(char *name) |
| { |
| setinputfile(name, INPUT_PUSH_FILE); |
| cmdloop(0); |
| popfile(); |
| } |
| |
| |
| /* ============ find_command inplementation */ |
| |
| /* |
| * Resolve a command name. If you change this routine, you may have to |
| * change the shellexec routine as well. |
| */ |
| static void |
| find_command(char *name, struct cmdentry *entry, int act, const char *path) |
| { |
| struct tblentry *cmdp; |
| int idx; |
| int prev; |
| char *fullname; |
| struct stat statb; |
| int e; |
| int updatetbl; |
| struct builtincmd *bcmd; |
| |
| /* If name contains a slash, don't use PATH or hash table */ |
| if (strchr(name, '/') != NULL) { |
| entry->u.index = -1; |
| if (act & DO_ABS) { |
| while (stat(name, &statb) < 0) { |
| #ifdef SYSV |
| if (errno == EINTR) |
| continue; |
| #endif |
| entry->cmdtype = CMDUNKNOWN; |
| return; |
| } |
| } |
| entry->cmdtype = CMDNORMAL; |
| return; |
| } |
| |
| /* #if ENABLE_FEATURE_SH_STANDALONE... moved after builtin check */ |
| |
| updatetbl = (path == pathval()); |
| if (!updatetbl) { |
| act |= DO_ALTPATH; |
| if (strstr(path, "%builtin") != NULL) |
| act |= DO_ALTBLTIN; |
| } |
| |
| /* If name is in the table, check answer will be ok */ |
| cmdp = cmdlookup(name, 0); |
| if (cmdp != NULL) { |
| int bit; |
| |
| switch (cmdp->cmdtype) { |
| default: |
| #if DEBUG |
| abort(); |
| #endif |
| case CMDNORMAL: |
| bit = DO_ALTPATH; |
| break; |
| case CMDFUNCTION: |
| bit = DO_NOFUNC; |
| break; |
| case CMDBUILTIN: |
| bit = DO_ALTBLTIN; |
| break; |
| } |
| if (act & bit) { |
| updatetbl = 0; |
| cmdp = NULL; |
| } else if (cmdp->rehash == 0) |
| /* if not invalidated by cd, we're done */ |
| goto success; |
| } |
| |
| /* If %builtin not in path, check for builtin next */ |
| bcmd = find_builtin(name); |
| if (bcmd) { |
| if (IS_BUILTIN_REGULAR(bcmd)) |
| goto builtin_success; |
| if (act & DO_ALTPATH) { |
| if (!(act & DO_ALTBLTIN)) |
| goto builtin_success; |
| } else if (builtinloc <= 0) { |
| goto builtin_success; |
| } |
| } |
| |
| #if ENABLE_FEATURE_SH_STANDALONE |
| { |
| int applet_no = find_applet_by_name(name); |
| if (applet_no >= 0) { |
| entry->cmdtype = CMDNORMAL; |
| entry->u.index = -2 - applet_no; |
| return; |
| } |
| } |
| #endif |
| |
| /* We have to search path. */ |
| prev = -1; /* where to start */ |
| if (cmdp && cmdp->rehash) { /* doing a rehash */ |
| if (cmdp->cmdtype == CMDBUILTIN) |
| prev = builtinloc; |
| else |
| prev = cmdp->param.index; |
| } |
| |
| e = ENOENT; |
| idx = -1; |
| loop: |
| while ((fullname = path_advance(&path, name)) != NULL) { |
| stunalloc(fullname); |
| /* NB: code below will still use fullname |
| * despite it being "unallocated" */ |
| idx++; |
| if (pathopt) { |
| if (prefix(pathopt, "builtin")) { |
| if (bcmd) |
| goto builtin_success; |
| continue; |
| } |
| if ((act & DO_NOFUNC) |
| || !prefix(pathopt, "func") |
| ) { /* ignore unimplemented options */ |
| continue; |
| } |
| } |
| /* if rehash, don't redo absolute path names */ |
| if (fullname[0] == '/' && idx <= prev) { |
| if (idx < prev) |
| continue; |
| TRACE(("searchexec \"%s\": no change\n", name)); |
| goto success; |
| } |
| while (stat(fullname, &statb) < 0) { |
| #ifdef SYSV |
| if (errno == EINTR) |
| continue; |
| #endif |
| if (errno != ENOENT && errno != ENOTDIR) |
| e = errno; |
| goto loop; |
| } |
| e = EACCES; /* if we fail, this will be the error */ |
| if (!S_ISREG(statb.st_mode)) |
| continue; |
| if (pathopt) { /* this is a %func directory */ |
| stalloc(strlen(fullname) + 1); |
| /* NB: stalloc will return space pointed by fullname |
| * (because we don't have any intervening allocations |
| * between stunalloc above and this stalloc) */ |
| readcmdfile(fullname); |
| cmdp = cmdlookup(name, 0); |
| if (cmdp == NULL || cmdp->cmdtype != CMDFUNCTION) |
| ash_msg_and_raise_error("%s not defined in %s", name, fullname); |
| stunalloc(fullname); |
| goto success; |
| } |
| TRACE(("searchexec \"%s\" returns \"%s\"\n", name, fullname)); |
| if (!updatetbl) { |
| entry->cmdtype = CMDNORMAL; |
| entry->u.index = idx; |
| return; |
| } |
| INT_OFF; |
| cmdp = cmdlookup(name, 1); |
| cmdp->cmdtype = CMDNORMAL; |
| cmdp->param.index = idx; |
| INT_ON; |
| goto success; |
| } |
| |
| /* We failed. If there was an entry for this command, delete it */ |
| if (cmdp && updatetbl) |
| delete_cmd_entry(); |
| if (act & DO_ERR) |
| ash_msg("%s: %s", name, errmsg(e, "not found")); |
| entry->cmdtype = CMDUNKNOWN; |
| return; |
| |
| builtin_success: |
| if (!updatetbl) { |
| entry->cmdtype = CMDBUILTIN; |
| entry->u.cmd = bcmd; |
| return; |
| } |
| INT_OFF; |
| cmdp = cmdlookup(name, 1); |
| cmdp->cmdtype = CMDBUILTIN; |
| cmdp->param.cmd = bcmd; |
| INT_ON; |
| success: |
| cmdp->rehash = 0; |
| entry->cmdtype = cmdp->cmdtype; |
| entry->u = cmdp->param; |
| } |
| |
| |
| /* |
| * The trap builtin. |
| */ |
| static int FAST_FUNC |
| trapcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
| { |
| char *action; |
| char **ap; |
| int signo, exitcode; |
| |
| nextopt(nullstr); |
| ap = argptr; |
| if (!*ap) { |
| for (signo = 0; signo < NSIG; signo++) { |
| char *tr = trap_ptr[signo]; |
| if (tr) { |
| /* note: bash adds "SIG", but only if invoked |
| * as "bash". If called as "sh", or if set -o posix, |
| * then it prints short signal names. |
| * We are printing short names: */ |
| out1fmt("trap -- %s %s\n", |
| single_quote(tr), |
| get_signame(signo)); |
| /* trap_ptr != trap only if we are in special-cased `trap` code. |
| * In this case, we will exit very soon, no need to free(). */ |
| /* if (trap_ptr != trap && tp[0]) */ |
| /* free(tr); */ |
| } |
| } |
| /* |
| if (trap_ptr != trap) { |
| free(trap_ptr); |
| trap_ptr = trap; |
| } |
| */ |
| return 0; |
| } |
| |
| action = NULL; |
| if (ap[1]) |
| action = *ap++; |
| exitcode = 0; |
| while (*ap) { |
| signo = get_signum(*ap); |
| if (signo < 0) { |
| /* Mimic bash message exactly */ |
| ash_msg("%s: invalid signal specification", *ap); |
| exitcode = 1; |
| goto next; |
| } |
| INT_OFF; |
| if (action) { |
| if (LONE_DASH(action)) |
| action = NULL; |
| else { |
| if (action[0]) /* not NULL and not "" and not "-" */ |
| may_have_traps = 1; |
| action = ckstrdup(action); |
| } |
| } |
| free(trap[signo]); |
| trap[signo] = action; |
| if (signo != 0) |
| setsignal(signo); |
| INT_ON; |
| next: |
| ap++; |
| } |
| return exitcode; |
| } |
| |
| |
| /* ============ Builtins */ |
| |
| #if ENABLE_ASH_HELP |
| static int FAST_FUNC |
| helpcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
| { |
| unsigned col; |
| unsigned i; |
| |
| out1fmt( |
| "Built-in commands:\n" |
| "------------------\n"); |
| for (col = 0, i = 0; i < ARRAY_SIZE(builtintab); i++) { |
| col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), |
| builtintab[i].name + 1); |
| if (col > 60) { |
| out1fmt("\n"); |
| col = 0; |
| } |
| } |
| # if ENABLE_FEATURE_SH_STANDALONE |
| { |
| const char *a = applet_names; |
| while (*a) { |
| col += out1fmt("%c%s", ((col == 0) ? '\t' : ' '), a); |
| if (col > 60) { |
| out1fmt("\n"); |
| col = 0; |
| } |
| while (*a++ != '\0') |
| continue; |
| } |
| } |
| # endif |
| newline_and_flush(stdout); |
| return EXIT_SUCCESS; |
| } |
| #endif |
| |
| #if MAX_HISTORY |
| static int FAST_FUNC |
| historycmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
| { |
| show_history(line_input_state); |
| return EXIT_SUCCESS; |
| } |
| #endif |
| |
| /* |
| * The export and readonly commands. |
| */ |
| static int FAST_FUNC |
| exportcmd(int argc UNUSED_PARAM, char **argv) |
| { |
| struct var *vp; |
| char *name; |
| const char *p; |
| char **aptr; |
| char opt; |
| int flag; |
| int flag_off; |
| |
| /* "readonly" in bash accepts, but ignores -n. |
| * We do the same: it saves a conditional in nextopt's param. |
| */ |
| flag_off = 0; |
| while ((opt = nextopt("np")) != '\0') { |
| if (opt == 'n') |
| flag_off = VEXPORT; |
| } |
| flag = VEXPORT; |
| if (argv[0][0] == 'r') { |
| flag = VREADONLY; |
| flag_off = 0; /* readonly ignores -n */ |
| } |
| flag_off = ~flag_off; |
| |
| /*if (opt_p_not_specified) - bash doesn't check this. Try "export -p NAME" */ |
| { |
| aptr = argptr; |
| name = *aptr; |
| if (name) { |
| do { |
| p = strchr(name, '='); |
| if (p != NULL) { |
| p++; |
| } else { |
| vp = *findvar(hashvar(name), name); |
| if (vp) { |
| vp->flags = ((vp->flags | flag) & flag_off); |
| continue; |
| } |
| } |
| setvar(name, p, (flag & flag_off)); |
| } while ((name = *++aptr) != NULL); |
| return 0; |
| } |
| } |
| |
| /* No arguments. Show the list of exported or readonly vars. |
| * -n is ignored. |
| */ |
| showvars(argv[0], flag, 0); |
| return 0; |
| } |
| |
| /* |
| * Delete a function if it exists. |
| */ |
| static void |
| unsetfunc(const char *name) |
| { |
| struct tblentry *cmdp; |
| |
| cmdp = cmdlookup(name, 0); |
| if (cmdp != NULL && cmdp->cmdtype == CMDFUNCTION) |
| delete_cmd_entry(); |
| } |
| |
| /* |
| * The unset builtin command. We unset the function before we unset the |
| * variable to allow a function to be unset when there is a readonly variable |
| * with the same name. |
| */ |
| static int FAST_FUNC |
| unsetcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
| { |
| char **ap; |
| int i; |
| int flag = 0; |
| int ret = 0; |
| |
| while ((i = nextopt("vf")) != 0) { |
| flag = i; |
| } |
| |
| for (ap = argptr; *ap; ap++) { |
| if (flag != 'f') { |
| i = unsetvar(*ap); |
| ret |= i; |
| if (!(i & 2)) |
| continue; |
| } |
| if (flag != 'v') |
| unsetfunc(*ap); |
| } |
| return ret & 1; |
| } |
| |
| static const unsigned char timescmd_str[] ALIGN1 = { |
| ' ', offsetof(struct tms, tms_utime), |
| '\n', offsetof(struct tms, tms_stime), |
| ' ', offsetof(struct tms, tms_cutime), |
| '\n', offsetof(struct tms, tms_cstime), |
| 0 |
| }; |
| static int FAST_FUNC |
| timescmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
| { |
| unsigned long clk_tck, s, t; |
| const unsigned char *p; |
| struct tms buf; |
| |
| clk_tck = bb_clk_tck(); |
| times(&buf); |
| |
| p = timescmd_str; |
| do { |
| t = *(clock_t *)(((char *) &buf) + p[1]); |
| s = t / clk_tck; |
| t = t % clk_tck; |
| out1fmt("%lum%lu.%03lus%c", |
| s / 60, s % 60, |
| (t * 1000) / clk_tck, |
| p[0]); |
| p += 2; |
| } while (*p); |
| |
| return 0; |
| } |
| |
| #if ENABLE_FEATURE_SH_MATH |
| /* |
| * The let builtin. Partially stolen from GNU Bash, the Bourne Again SHell. |
| * Copyright (C) 1987, 1989, 1991 Free Software Foundation, Inc. |
| * |
| * Copyright (C) 2003 Vladimir Oleynik <dzo@simtreas.ru> |
| */ |
| static int FAST_FUNC |
| letcmd(int argc UNUSED_PARAM, char **argv) |
| { |
| arith_t i; |
| |
| argv++; |
| if (!*argv) |
| ash_msg_and_raise_error("expression expected"); |
| do { |
| i = ash_arith(*argv); |
| } while (*++argv); |
| |
| return !i; |
| } |
| #endif |
| |
| /* |
| * The read builtin. Options: |
| * -r Do not interpret '\' specially |
| * -s Turn off echo (tty only) |
| * -n NCHARS Read NCHARS max |
| * -p PROMPT Display PROMPT on stderr (if input is from tty) |
| * -t SECONDS Timeout after SECONDS (tty or pipe only) |
| * -u FD Read from given FD instead of fd 0 |
| * This uses unbuffered input, which may be avoidable in some cases. |
| * TODO: bash also has: |
| * -a ARRAY Read into array[0],[1],etc |
| * -d DELIM End on DELIM char, not newline |
| * -e Use line editing (tty only) |
| */ |
| static int FAST_FUNC |
| readcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
| { |
| char *opt_n = NULL; |
| char *opt_p = NULL; |
| char *opt_t = NULL; |
| char *opt_u = NULL; |
| int read_flags = 0; |
| const char *r; |
| int i; |
| |
| while ((i = nextopt("p:u:rt:n:s")) != '\0') { |
| switch (i) { |
| case 'p': |
| opt_p = optionarg; |
| break; |
| case 'n': |
| opt_n = optionarg; |
| break; |
| case 's': |
| read_flags |= BUILTIN_READ_SILENT; |
| break; |
| case 't': |
| opt_t = optionarg; |
| break; |
| case 'r': |
| read_flags |= BUILTIN_READ_RAW; |
| break; |
| case 'u': |
| opt_u = optionarg; |
| break; |
| default: |
| break; |
| } |
| } |
| |
| /* "read -s" needs to save/restore termios, can't allow ^C |
| * to jump out of it. |
| */ |
| again: |
| INT_OFF; |
| r = shell_builtin_read(setvar0, |
| argptr, |
| bltinlookup("IFS"), /* can be NULL */ |
| read_flags, |
| opt_n, |
| opt_p, |
| opt_t, |
| opt_u |
| ); |
| INT_ON; |
| |
| if ((uintptr_t)r == 1 && errno == EINTR) { |
| /* to get SIGCHLD: sleep 1 & read x; echo $x */ |
| if (pending_sig == 0) |
| goto again; |
| } |
| |
| if ((uintptr_t)r > 1) |
| ash_msg_and_raise_error(r); |
| |
| return (uintptr_t)r; |
| } |
| |
| static int FAST_FUNC |
| umaskcmd(int argc UNUSED_PARAM, char **argv UNUSED_PARAM) |
| { |
| static const char permuser[3] ALIGN1 = "ogu"; |
| |
| mode_t mask; |
| int symbolic_mode = 0; |
| |
| while (nextopt("S") != '\0') { |
| symbolic_mode = 1; |
| } |
| |
| INT_OFF; |
| mask = umask(0); |
| umask(mask); |
| INT_ON; |
| |
| if (*argptr == NULL) { |
| if (symbolic_mode) { |
| char buf[sizeof(",u=rwx,g=rwx,o=rwx")]; |
| char *p = buf; |
| int i; |
| |
| i = 2; |
| for (;;) { |
| *p++ = ','; |
| *p++ = permuser[i]; |
| *p++ = '='; |
| /* mask is 0..0uuugggooo. i=2 selects uuu bits */ |
| if (!(mask & 0400)) *p++ = 'r'; |
| if (!(mask & 0200)) *p++ = 'w'; |
| if (!(mask & 0100)) *p++ = 'x'; |
| mask <<= 3; |
| if (--i < 0) |
| break; |
| } |
| *p = '\0'; |
| puts(buf + 1); |
| } else { |
| out1fmt("%04o\n", mask); |
| } |
| } else { |
| char *modestr = *argptr; |
| /* numeric umasks are taken as-is */ |
| /* symbolic umasks are inverted: "umask a=rx" calls umask(222) */ |
| if (!isdigit(modestr[0])) |
| mask ^= 0777; |
| mask = bb_parse_mode(modestr, mask); |
| if ((unsigned)mask > 0777) { |
| ash_msg_and_raise_error("illegal mode: %s", modestr); |
| } |
| if (!isdigit(modestr[0])) |
| mask ^= 0777; |
| umask(mask); |
| } |
| return 0; |
| } |
| |
| static int FAST_FUNC |
| ulimitcmd(int argc UNUSED_PARAM, char **argv) |
| { |
| return shell_builtin_ulimit(argv); |
| } |
| |
| /* ============ main() and helpers */ |
| |
| /* |
| * Called to exit the shell. |
| */ |
| static void |
| exitshell(void) |
| { |
| struct jmploc loc; |
| char *p; |
| int status; |
| |
| #if ENABLE_FEATURE_EDITING_SAVE_ON_EXIT |
| save_history(line_input_state); |
| #endif |
| status = exitstatus; |
| TRACE(("pid %d, exitshell(%d)\n", getpid(), status)); |
| if (setjmp(loc.loc)) { |
| if (exception_type == EXEXIT) |
| status = exitstatus; |
| goto out; |
| } |
| exception_handler = &loc; |
| p = trap[0]; |
| if (p) { |
| trap[0] = NULL; |
| evalskip = 0; |
| evalstring(p, 0); |
| /*free(p); - we'll exit soon */ |
| } |
| out: |
| /* dash wraps setjobctl(0) in "if (setjmp(loc.loc) == 0) {...}". |
| * our setjobctl(0) does not panic if tcsetpgrp fails inside it. |
| */ |
| setjobctl(0); |
| flush_stdout_stderr(); |
| _exit(status); |
| /* NOTREACHED */ |
| } |
| |
| static void |
| init(void) |
| { |
| /* we will never free this */ |
| basepf.next_to_pgetc = basepf.buf = ckmalloc(IBUFSIZ); |
| |
| sigmode[SIGCHLD - 1] = S_DFL; |
| setsignal(SIGCHLD); |
| |
| /* bash re-enables SIGHUP which is SIG_IGNed on entry. |
| * Try: "trap '' HUP; bash; echo RET" and type "kill -HUP $$" |
| */ |
| signal(SIGHUP, SIG_DFL); |
| |
| { |
| char **envp; |
| const char *p; |
| struct stat st1, st2; |
| |
| initvar(); |
| for (envp = environ; envp && *envp; envp++) { |
| p = endofname(*envp); |
| if (p != *envp && *p == '=') { |
| setvareq(*envp, VEXPORT|VTEXTFIXED); |
| } |
| } |
| |
| setvareq((char*)defoptindvar, VTEXTFIXED); |
| |
| setvar0("PPID", utoa(getppid())); |
| #if BASH_SHLVL_VAR |
| p = lookupvar("SHLVL"); |
| setvar("SHLVL", utoa((p ? atoi(p) : 0) + 1), VEXPORT); |
| #endif |
| #if BASH_HOSTNAME_VAR |
| if (!lookupvar("HOSTNAME")) { |
| struct utsname uts; |
| uname(&uts); |
| setvar0("HOSTNAME", uts.nodename); |
| } |
| #endif |
| p = lookupvar("PWD"); |
| if (p) { |
| if (p[0] != '/' || stat(p, &st1) || stat(".", &st2) |
| || st1.st_dev != st2.st_dev || st1.st_ino != st2.st_ino |
| ) { |
| p = NULL; |
| } |
| } |
| setpwd(p, 0); |
| } |
| } |
| |
| |
| //usage:#define ash_trivial_usage |
| //usage: "[-/+OPTIONS] [-/+o OPT]... [-c 'SCRIPT' [ARG0 [ARGS]] / FILE [ARGS]]" |
| //usage:#define ash_full_usage "\n\n" |
| //usage: "Unix shell interpreter" |
| |
| /* |
| * Process the shell command line arguments. |
| */ |
| static void |
| procargs(char **argv) |
| { |
| int i; |
| const char *xminusc; |
| char **xargv; |
| |
| xargv = argv; |
| arg0 = xargv[0]; |
| /* if (xargv[0]) - mmm, this is always true! */ |
| xargv++; |
| for (i = 0; i < NOPTS; i++) |
| optlist[i] = 2; |
| argptr = xargv; |
| if (options(/*cmdline:*/ 1)) { |
| /* it already printed err message */ |
| raise_exception(EXERROR); |
| } |
| xargv = argptr; |
| xminusc = minusc; |
| if (*xargv == NULL) { |
| if (xminusc) |
| ash_msg_and_raise_error(bb_msg_requires_arg, "-c"); |
| sflag = 1; |
| } |
| if (iflag == 2 && sflag == 1 && isatty(0) && isatty(1)) |
| iflag = 1; |
| if (mflag == 2) |
| mflag = iflag; |
| for (i = 0; i < NOPTS; i++) |
| if (optlist[i] == 2) |
| optlist[i] = 0; |
| #if DEBUG == 2 |
| debug = 1; |
| #endif |
| /* POSIX 1003.2: first arg after "-c CMD" is $0, remainder $1... */ |
| if (xminusc) { |
| minusc = *xargv++; |
| if (*xargv) |
| goto setarg0; |
| } else if (!sflag) { |
| setinputfile(*xargv, 0); |
| setarg0: |
| arg0 = *xargv++; |
| commandname = arg0; |
| } |
| |
| shellparam.p = xargv; |
| #if ENABLE_ASH_GETOPTS |
| shellparam.optind = 1; |
| shellparam.optoff = -1; |
| #endif |
| /* assert(shellparam.malloced == 0 && shellparam.nparam == 0); */ |
| while (*xargv) { |
| shellparam.nparam++; |
| xargv++; |
| } |
| optschanged(); |
| } |
| |
| /* |
| * Read /etc/profile, ~/.profile, $ENV. |
| */ |
| static void |
| read_profile(const char *name) |
| { |
| name = expandstr(name); |
| if (setinputfile(name, INPUT_PUSH_FILE | INPUT_NOFILE_OK) < 0) |
| return; |
| cmdloop(0); |
| popfile(); |
| } |
| |
| /* |
| * This routine is called when an error or an interrupt occurs in an |
| * interactive shell and control is returned to the main command loop. |
| * (In dash, this function is auto-generated by build machinery). |
| */ |
| static void |
| reset(void) |
| { |
| /* from eval.c: */ |
| evalskip = 0; |
| loopnest = 0; |
| |
| /* from expand.c: */ |
| ifsfree(); |
| |
| /* from input.c: */ |
| g_parsefile->left_in_buffer = 0; |
| g_parsefile->left_in_line = 0; /* clear input buffer */ |
| popallfiles(); |
| |
| /* from redir.c: */ |
| while (redirlist) |
| popredir(/*drop:*/ 0, /*restore:*/ 0); |
| } |
| |
| #if PROFILE |
| static short profile_buf[16384]; |
| extern int etext(); |
| #endif |
| |
| /* |
| * Main routine. We initialize things, parse the arguments, execute |
| * profiles if we're a login shell, and then call cmdloop to execute |
| * commands. The setjmp call sets up the location to jump to when an |
| * exception occurs. When an exception occurs the variable "state" |
| * is used to figure out how far we had gotten. |
| */ |
| int ash_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
| int ash_main(int argc UNUSED_PARAM, char **argv) |
| { |
| volatile smallint state; |
| struct jmploc jmploc; |
| struct stackmark smark; |
| |
| /* Initialize global data */ |
| INIT_G_misc(); |
| INIT_G_memstack(); |
| INIT_G_var(); |
| #if ENABLE_ASH_ALIAS |
| INIT_G_alias(); |
| #endif |
| INIT_G_cmdtable(); |
| |
| #if PROFILE |
| monitor(4, etext, profile_buf, sizeof(profile_buf), 50); |
| #endif |
| |
| #if ENABLE_FEATURE_EDITING |
| line_input_state = new_line_input_t(FOR_SHELL | WITH_PATH_LOOKUP); |
| #endif |
| state = 0; |
| if (setjmp(jmploc.loc)) { |
| smallint e; |
| smallint s; |
| |
| reset(); |
| |
| e = exception_type; |
| s = state; |
| if (e == EXEXIT || s == 0 || iflag == 0 || shlvl) { |
| exitshell(); |
| } |
| if (e == EXINT) { |
| newline_and_flush(stderr); |
| } |
| |
| popstackmark(&smark); |
| FORCE_INT_ON; /* enable interrupts */ |
| if (s == 1) |
| goto state1; |
| if (s == 2) |
| goto state2; |
| if (s == 3) |
| goto state3; |
| goto state4; |
| } |
| exception_handler = &jmploc; |
| rootpid = getpid(); |
| |
| init(); |
| setstackmark(&smark); |
| procargs(argv); |
| #if DEBUG |
| TRACE(("Shell args: ")); |
| trace_puts_args(argv); |
| #endif |
| |
| if (argv[0] && argv[0][0] == '-') |
| isloginsh = 1; |
| if (isloginsh) { |
| const char *hp; |
| |
| state = 1; |
| read_profile("/etc/profile"); |
| state1: |
| state = 2; |
| hp = lookupvar("HOME"); |
| if (hp) |
| read_profile("$HOME/.profile"); |
| } |
| state2: |
| state = 3; |
| if ( |
| #ifndef linux |
| getuid() == geteuid() && getgid() == getegid() && |
| #endif |
| iflag |
| ) { |
| const char *shinit = lookupvar("ENV"); |
| if (shinit != NULL && *shinit != '\0') |
| read_profile(shinit); |
| } |
| popstackmark(&smark); |
| state3: |
| state = 4; |
| if (minusc) { |
| /* evalstring pushes parsefile stack. |
| * Ensure we don't falsely claim that 0 (stdin) |
| * is one of stacked source fds. |
| * Testcase: ash -c 'exec 1>&0' must not complain. */ |
| // if (!sflag) g_parsefile->pf_fd = -1; |
| // ^^ not necessary since now we special-case fd 0 |
| // in is_hidden_fd() to not be considered "hidden fd" |
| evalstring(minusc, 0); |
| } |
| |
| if (sflag || minusc == NULL) { |
| #if MAX_HISTORY > 0 && ENABLE_FEATURE_EDITING_SAVEHISTORY |
| if (iflag) { |
| const char *hp = lookupvar("HISTFILE"); |
| if (!hp) { |
| hp = lookupvar("HOME"); |
| if (hp) { |
| INT_OFF; |
| hp = concat_path_file(hp, ".ash_history"); |
| setvar0("HISTFILE", hp); |
| free((char*)hp); |
| INT_ON; |
| hp = lookupvar("HISTFILE"); |
| } |
| } |
| if (hp) |
| line_input_state->hist_file = hp; |
| # if ENABLE_FEATURE_SH_HISTFILESIZE |
| hp = lookupvar("HISTFILESIZE"); |
| line_input_state->max_history = size_from_HISTFILESIZE(hp); |
| # endif |
| } |
| #endif |
| state4: /* XXX ??? - why isn't this before the "if" statement */ |
| cmdloop(1); |
| } |
| #if PROFILE |
| monitor(0); |
| #endif |
| #ifdef GPROF |
| { |
| extern void _mcleanup(void); |
| _mcleanup(); |
| } |
| #endif |
| TRACE(("End of main reached\n")); |
| exitshell(); |
| /* NOTREACHED */ |
| } |
| |
| |
| /*- |
| * Copyright (c) 1989, 1991, 1993, 1994 |
| * The Regents of the University of California. All rights reserved. |
| * |
| * This code is derived from software contributed to Berkeley by |
| * Kenneth Almquist. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * 1. Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * 2. Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * 3. Neither the name of the University nor the names of its contributors |
| * may be used to endorse or promote products derived from this software |
| * without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND |
| * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE |
| * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| * SUCH DAMAGE. |
| */ |
