blob: 92a0f8536f3bc7d097b85ecc16848ebc5395b1f9 [file] [log] [blame]
/* vi: set sw=4 ts=4: */
/*
* Minix shell port for busybox
*
* This version of the Minix shell was adapted for use in busybox
* by Erik Andersen <andersee@debian.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* Original copyright notice is retained at the end of this file.
*/
#include <ctype.h>
#include <dirent.h>
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <setjmp.h>
#include <signal.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <sys/stat.h>
#include <sys/times.h>
#include <sys/types.h>
#include <sys/wait.h>
#include "cmdedit.h"
#include "busybox.h"
/* -------- sh.h -------- */
/*
* shell
*/
#define LINELIM 2100
#define NPUSH 8 /* limit to input nesting */
#define NOFILE 20 /* Number of open files */
#define NUFILE 10 /* Number of user-accessible files */
#define FDBASE 10 /* First file usable by Shell */
/*
* values returned by wait
*/
#define WAITSIG(s) ((s)&0177)
#define WAITVAL(s) (((s)>>8)&0377)
#define WAITCORE(s) (((s)&0200)!=0)
/*
* library and system defintions
*/
typedef void xint; /* base type of jmp_buf, for not broken compilers */
/*
* shell components
*/
#define QUOTE 0200
#define NOBLOCK ((struct op *)NULL)
#define NOWORD ((char *)NULL)
#define NOWORDS ((char **)NULL)
#define NOPIPE ((int *)NULL)
/*
* Description of a command or an operation on commands.
* Might eventually use a union.
*/
struct op {
int type; /* operation type, see below */
char **words; /* arguments to a command */
struct ioword **ioact; /* IO actions (eg, < > >>) */
struct op *left;
struct op *right;
char *str; /* identifier for case and for */
};
#define TCOM 1 /* command */
#define TPAREN 2 /* (c-list) */
#define TPIPE 3 /* a | b */
#define TLIST 4 /* a [&;] b */
#define TOR 5 /* || */
#define TAND 6 /* && */
#define TFOR 7
#define TDO 8
#define TCASE 9
#define TIF 10
#define TWHILE 11
#define TUNTIL 12
#define TELIF 13
#define TPAT 14 /* pattern in case */
#define TBRACE 15 /* {c-list} */
#define TASYNC 16 /* c & */
/*
* actions determining the environment of a process
*/
#define BIT(i) (1<<(i))
#define FEXEC BIT(0) /* execute without forking */
/*
* flags to control evaluation of words
*/
#define DOSUB 1 /* interpret $, `, and quotes */
#define DOBLANK 2 /* perform blank interpretation */
#define DOGLOB 4 /* interpret [?* */
#define DOKEY 8 /* move words with `=' to 2nd arg. list */
#define DOTRIM 16 /* trim resulting string */
#define DOALL (DOSUB|DOBLANK|DOGLOB|DOKEY|DOTRIM)
static char **dolv;
static int dolc;
static int exstat;
static char gflg;
static int interactive; /* Is this an interactive shell */
static int execflg;
static int multiline; /* \n changed to ; */
static struct op *outtree; /* result from parser */
static xint *failpt;
static xint *errpt;
static struct brkcon *brklist;
static int isbreak;
static int newfile(char *s);
static char *findeq(char *cp);
static char *cclass(char *p, int sub);
static void initarea(void);
extern int msh_main(int argc, char **argv);
struct brkcon {
jmp_buf brkpt;
struct brkcon *nextlev;
} ;
/*
* redirection
*/
struct ioword {
short io_unit; /* unit affected */
short io_flag; /* action (below) */
char *io_name; /* file name */
};
#define IOREAD 1 /* < */
#define IOHERE 2 /* << (here file) */
#define IOWRITE 4 /* > */
#define IOCAT 8 /* >> */
#define IOXHERE 16 /* ${}, ` in << */
#define IODUP 32 /* >&digit */
#define IOCLOSE 64 /* >&- */
#define IODEFAULT (-1) /* token for default IO unit */
static struct wdblock *wdlist;
static struct wdblock *iolist;
/*
* parsing & execution environment
*/
static struct env {
char *linep;
struct io *iobase;
struct io *iop;
xint *errpt;
int iofd;
struct env *oenv;
} e;
/*
* flags:
* -e: quit on error
* -k: look for name=value everywhere on command line
* -n: no execution
* -t: exit after reading and executing one command
* -v: echo as read
* -x: trace
* -u: unset variables net diagnostic
*/
static char *flag;
static char *null; /* null value for variable */
static int intr; /* interrupt pending */
static char *trap[_NSIG+1];
static char ourtrap[_NSIG+1];
static int trapset; /* trap pending */
static int heedint; /* heed interrupt signals */
static int yynerrs; /* yacc */
static char line[LINELIM];
static char *elinep;
/*
* other functions
*/
static int (*inbuilt(char *s ))(void);
static char *rexecve (char *c , char **v, char **envp );
static char *space (int n );
static char *strsave (char *s, int a );
static char *evalstr (char *cp, int f );
static char *putn (int n );
static char *itoa (unsigned u, int n );
static char *unquote (char *as );
static struct var *lookup (char *n );
static int rlookup (char *n );
static struct wdblock *glob (char *cp, struct wdblock *wb );
static int my_getc( int ec);
static int subgetc (int ec, int quoted );
static char **makenv (void);
static char **eval (char **ap, int f );
static int setstatus (int s );
static int waitfor (int lastpid, int canintr );
static void onintr (int s ); /* SIGINT handler */
static int newenv (int f );
static void quitenv (void);
static void err (char *s );
static int anys (char *s1, char *s2 );
static int any (int c, char *s );
static void next (int f );
static void setdash (void);
static void onecommand (void);
static void runtrap (int i );
static int gmatch (char *s, char *p );
/*
* error handling
*/
static void leave (void); /* abort shell (or fail in subshell) */
static void fail (void); /* fail but return to process next command */
static void warn (char *s );
static void sig (int i ); /* default signal handler */
/* -------- area stuff -------- */
#define REGSIZE sizeof(struct region)
#define GROWBY 256
//#define SHRINKBY 64
#undef SHRINKBY
#define FREE 32767
#define BUSY 0
#define ALIGN (sizeof(int)-1)
struct region {
struct region *next;
int area;
};
/* -------- grammar stuff -------- */
typedef union {
char *cp;
char **wp;
int i;
struct op *o;
} YYSTYPE;
#define WORD 256
#define LOGAND 257
#define LOGOR 258
#define BREAK 259
#define IF 260
#define THEN 261
#define ELSE 262
#define ELIF 263
#define FI 264
#define CASE 265
#define ESAC 266
#define FOR 267
#define WHILE 268
#define UNTIL 269
#define DO 270
#define DONE 271
#define IN 272
#define YYERRCODE 300
/* flags to yylex */
#define CONTIN 01 /* skip new lines to complete command */
#define SYNTAXERR zzerr()
static struct op *pipeline(int cf );
static struct op *andor(void);
static struct op *c_list(void);
static int synio(int cf );
static void musthave (int c, int cf );
static struct op *simple(void);
static struct op *nested(int type, int mark );
static struct op *command(int cf );
static struct op *dogroup(int onlydone );
static struct op *thenpart(void);
static struct op *elsepart(void);
static struct op *caselist(void);
static struct op *casepart(void);
static char **pattern(void);
static char **wordlist(void);
static struct op *list(struct op *t1, struct op *t2 );
static struct op *block(int type, struct op *t1, struct op *t2, char **wp );
static struct op *newtp(void);
static struct op *namelist(struct op *t );
static char **copyw(void);
static void word(char *cp );
static struct ioword **copyio(void);
static struct ioword *io (int u, int f, char *cp );
static void zzerr(void);
static void yyerror(char *s );
static int yylex(int cf );
static int collect(int c, int c1 );
static int dual(int c );
static void diag(int ec );
static char *tree(unsigned size );
/* -------- var.h -------- */
struct var {
char *value;
char *name;
struct var *next;
char status;
};
#define COPYV 1 /* flag to setval, suggesting copy */
#define RONLY 01 /* variable is read-only */
#define EXPORT 02 /* variable is to be exported */
#define GETCELL 04 /* name & value space was got with getcell */
static struct var *vlist; /* dictionary */
static struct var *homedir; /* home directory */
static struct var *prompt; /* main prompt */
static struct var *cprompt; /* continuation prompt */
static struct var *path; /* search path for commands */
static struct var *shell; /* shell to interpret command files */
static struct var *ifs; /* field separators */
static int yyparse (void);
static struct var *lookup (char *n );
static void setval (struct var *vp, char *val );
static void nameval (struct var *vp, char *val, char *name );
static void export (struct var *vp );
static void ronly (struct var *vp );
static int isassign (char *s );
static int checkname (char *cp );
static int assign (char *s, int cf );
static void putvlist (int f, int out );
static int eqname (char *n1, char *n2 );
static int execute (struct op *t, int *pin, int *pout, int act );
/* -------- io.h -------- */
/* io buffer */
struct iobuf {
unsigned id; /* buffer id */
char buf[512]; /* buffer */
char *bufp; /* pointer into buffer */
char *ebufp; /* pointer to end of buffer */
};
/* possible arguments to an IO function */
struct ioarg {
char *aword;
char **awordlist;
int afile; /* file descriptor */
unsigned afid; /* buffer id */
long afpos; /* file position */
struct iobuf *afbuf; /* buffer for this file */
};
//static struct ioarg ioargstack[NPUSH];
#define AFID_NOBUF (~0)
#define AFID_ID 0
/* an input generator's state */
struct io {
int (*iofn)();
struct ioarg *argp;
int peekc;
char prev; /* previous character read by readc() */
char nlcount; /* for `'s */
char xchar; /* for `'s */
char task; /* reason for pushed IO */
};
//static struct io iostack[NPUSH];
#define XOTHER 0 /* none of the below */
#define XDOLL 1 /* expanding ${} */
#define XGRAVE 2 /* expanding `'s */
#define XIO 3 /* file IO */
/* in substitution */
#define INSUB() (e.iop->task == XGRAVE || e.iop->task == XDOLL)
/*
* input generators for IO structure
*/
static int nlchar (struct ioarg *ap );
static int strchar (struct ioarg *ap );
static int qstrchar (struct ioarg *ap );
static int filechar (struct ioarg *ap );
static int herechar (struct ioarg *ap );
static int linechar (struct ioarg *ap );
static int gravechar (struct ioarg *ap, struct io *iop );
static int qgravechar (struct ioarg *ap, struct io *iop );
static int dolchar (struct ioarg *ap );
static int wdchar (struct ioarg *ap );
static void scraphere (void);
static void freehere (int area );
static void gethere (void);
static void markhere (char *s, struct ioword *iop );
static int herein (char *hname, int xdoll );
static int run (struct ioarg *argp, int (*f)());
/*
* IO functions
*/
static int eofc (void);
static int readc (void);
static void unget (int c );
static void ioecho (int c );
static void prs (char *s );
static void prn (unsigned u );
static void closef (int i );
static void closeall (void);
/*
* IO control
*/
static void pushio (struct ioarg *argp, int (*fn)());
static int remap (int fd );
static int openpipe (int *pv );
static void closepipe (int *pv );
static struct io *setbase (struct io *ip );
static struct ioarg temparg; /* temporary for PUSHIO */
#define PUSHIO(what,arg,gen) ((temparg.what = (arg)),pushio(&temparg,(gen)))
#define RUN(what,arg,gen) ((temparg.what = (arg)), run(&temparg,(gen)))
/* -------- word.h -------- */
#define NSTART 16 /* default number of words to allow for initially */
struct wdblock {
short w_bsize;
short w_nword;
/* bounds are arbitrary */
char *w_words[1];
};
static struct wdblock *addword (char *wd, struct wdblock *wb );
static struct wdblock *newword (int nw );
static char **getwords (struct wdblock *wb );
/* -------- area.h -------- */
/*
* storage allocation
*/
static char *getcell (unsigned nbytes );
static void garbage (void);
static void setarea (char *cp, int a );
static int getarea (char *cp );
static void freearea (int a );
static void freecell (char *cp );
static int areanum; /* current allocation area */
#define NEW(type) (type *)getcell(sizeof(type))
#define DELETE(obj) freecell((char *)obj)
/* -------- misc stuff -------- */
static int forkexec (struct op *t, int *pin, int *pout, int act, char **wp, int *pforked );
static int iosetup (struct ioword *iop, int pipein, int pipeout );
static void echo(char **wp );
static struct op **find1case (struct op *t, char *w );
static struct op *findcase (struct op *t, char *w );
static void brkset(struct brkcon *bc );
static int dolabel(void);
static int dohelp(void);
static int dochdir(struct op *t );
static int doshift(struct op *t );
static int dologin(struct op *t );
static int doumask(struct op *t );
static int doexec(struct op *t );
static int dodot(struct op *t );
static int dowait(struct op *t );
static int doread(struct op *t );
static int doeval(struct op *t );
static int dotrap(struct op *t );
static int getsig(char *s );
static void setsig (int n, void (*f)());
static int getn(char *as );
static int dobreak(struct op *t );
static int docontinue(struct op *t );
static int brkcontin (char *cp, int val );
static int doexit(struct op *t );
static int doexport(struct op *t );
static int doreadonly(struct op *t );
static void rdexp (char **wp, void (*f)(), int key);
static void badid(char *s );
static int doset(struct op *t );
static void varput (char *s, int out );
static int dotimes(void);
static int expand (char *cp, struct wdblock **wbp, int f );
static char *blank(int f );
static int dollar(int quoted );
static int grave(int quoted );
static void globname (char *we, char *pp );
static char *generate (char *start1, char *end1, char *middle, char *end );
static int anyspcl(struct wdblock *wb );
static int xstrcmp (char *p1, char *p2 );
static void glob0 (char *a0, unsigned int a1, int a2, int (*a3)(char *, char *));
static void glob1 (char *base, char *lim );
static void glob2 (char *i, char *j );
static void glob3 (char *i, char *j, char *k );
static void readhere (char **name, char *s, int ec );
static void pushio(struct ioarg *argp, int (*fn)());
static int xxchar(struct ioarg *ap );
struct here {
char *h_tag;
int h_dosub;
struct ioword *h_iop;
struct here *h_next;
};
static char *signame[] = {
"Signal 0",
"Hangup",
(char *)NULL, /* interrupt */
"Quit",
"Illegal instruction",
"Trace/BPT trap",
"Abort",
"Bus error",
"Floating Point Exception",
"Killed",
"SIGUSR1",
"SIGSEGV",
"SIGUSR2",
(char *)NULL, /* broken pipe */
"Alarm clock",
"Terminated",
};
#define NSIGNAL (sizeof(signame)/sizeof(signame[0]))
struct res {
char *r_name;
int r_val;
};
static struct res restab[] = {
{"for", FOR},
{"case", CASE},
{"esac", ESAC},
{"while", WHILE},
{"do", DO},
{"done", DONE},
{"if", IF},
{"in", IN},
{"then", THEN},
{"else", ELSE},
{"elif", ELIF},
{"until", UNTIL},
{"fi", FI},
{";;", BREAK},
{"||", LOGOR},
{"&&", LOGAND},
{"{", '{'},
{"}", '}'},
{0, 0},
};
struct builtincmd {
const char *name;
int (*builtinfunc)();
};
static const struct builtincmd builtincmds[] = {
{".", dodot},
{":", dolabel},
{"break", dobreak},
{"cd", dochdir},
{"continue",docontinue},
{"eval", doeval},
{"exec", doexec},
{"exit", doexit},
{"export", doexport},
{"help", dohelp},
{"login", dologin},
{"newgrp", dologin},
{"read", doread},
{"readonly",doreadonly},
{"set", doset},
{"shift", doshift},
{"times", dotimes},
{"trap", dotrap},
{"umask", doumask},
{"wait", dowait},
{0,0}
};
/* Globals */
extern char **environ; /* environment pointer */
static char **dolv;
static int dolc;
static int exstat;
static char gflg;
static int interactive; /* Is this an interactive shell */
static int execflg;
static int multiline; /* \n changed to ; */
static struct op *outtree; /* result from parser */
static xint *failpt;
static xint *errpt;
static struct brkcon *brklist;
static int isbreak;
static struct wdblock *wdlist;
static struct wdblock *iolist;
static char *trap[_NSIG+1];
static char ourtrap[_NSIG+1];
static int trapset; /* trap pending */
static int yynerrs; /* yacc */
static char line[LINELIM];
static struct var *vlist; /* dictionary */
static struct var *homedir; /* home directory */
static struct var *prompt; /* main prompt */
static struct var *cprompt; /* continuation prompt */
static struct var *path; /* search path for commands */
static struct var *shell; /* shell to interpret command files */
static struct var *ifs; /* field separators */
static struct ioarg ioargstack[NPUSH];
static struct io iostack[NPUSH];
static int areanum; /* current allocation area */
static int intr;
static int inparse;
static char flags['z'-'a'+1];
static char *flag = flags-'a';
static char *elinep = line+sizeof(line)-5;
static char *null = "";
static int heedint =1;
static struct env e ={line, iostack, iostack-1, (xint *)NULL, FDBASE, (struct env *)NULL};
static void (*qflag)(int) = SIG_IGN;
static char shellname[] = "/bin/sh";
static char search[] = ":/bin:/usr/bin";
static int startl;
static int peeksym;
static int nlseen;
static int iounit = IODEFAULT;
static YYSTYPE yylval;
static struct iobuf sharedbuf = {AFID_NOBUF};
static struct iobuf mainbuf = {AFID_NOBUF};
static unsigned bufid = AFID_ID; /* buffer id counter */
static struct ioarg temparg = {0, 0, 0, AFID_NOBUF, 0};
static struct here *inhere; /* list of hear docs while parsing */
static struct here *acthere; /* list of active here documents */
static struct region *areabot; /* bottom of area */
static struct region *areatop; /* top of area */
static struct region *areanxt; /* starting point of scan */
static void * brktop;
static void * brkaddr;
#ifdef BB_FEATURE_COMMAND_EDITING
static char * current_prompt;
#endif
/* -------- sh.c -------- */
/*
* shell
*/
extern int msh_main(int argc, char **argv)
{
register int f;
register char *s;
int cflag;
char *name, **ap;
int (*iof)();
initarea();
if ((ap = environ) != NULL) {
while (*ap)
assign(*ap++, !COPYV);
for (ap = environ; *ap;)
export(lookup(*ap++));
}
closeall();
areanum = 1;
shell = lookup("SHELL");
if (shell->value == null)
setval(shell, shellname);
export(shell);
homedir = lookup("HOME");
if (homedir->value == null)
setval(homedir, "/");
export(homedir);
setval(lookup("$"), itoa(getpid(), 5));
path = lookup("PATH");
if (path->value == null)
setval(path, search);
export(path);
ifs = lookup("IFS");
if (ifs->value == null)
setval(ifs, " \t\n");
prompt = lookup("PS1");
#ifdef BB_FEATURE_SH_FANCY_PROMPT
if (prompt->value == null)
#endif
setval(prompt, "$ ");
if (geteuid() == 0) {
setval(prompt, "# ");
prompt->status &= ~EXPORT;
}
cprompt = lookup("PS2");
#ifdef BB_FEATURE_SH_FANCY_PROMPT
if (cprompt->value == null)
#endif
setval(cprompt, "> ");
iof = filechar;
cflag = 0;
name = *argv++;
if (--argc >= 1) {
if(argv[0][0] == '-' && argv[0][1] != '\0') {
for (s = argv[0]+1; *s; s++)
switch (*s) {
case 'c':
prompt->status &= ~EXPORT;
cprompt->status &= ~EXPORT;
setval(prompt, "");
setval(cprompt, "");
cflag = 1;
if (--argc > 0)
PUSHIO(aword, *++argv, iof = nlchar);
break;
case 'q':
qflag = SIG_DFL;
break;
case 's':
/* standard input */
break;
case 't':
prompt->status &= ~EXPORT;
setval(prompt, "");
iof = linechar;
break;
case 'i':
interactive++;
default:
if (*s>='a' && *s<='z')
flag[(int)*s]++;
}
} else {
argv--;
argc++;
}
if (iof == filechar && --argc > 0) {
setval(prompt, "");
setval(cprompt, "");
prompt->status &= ~EXPORT;
cprompt->status &= ~EXPORT;
if (newfile(name = *++argv))
exit(1);
}
}
setdash();
if (e.iop < iostack) {
PUSHIO(afile, 0, iof);
if (isatty(0) && isatty(1) && !cflag) {
interactive++;
printf( "\n\n" BB_BANNER " Built-in shell (msh)\n");
printf( "Enter 'help' for a list of built-in commands.\n\n");
}
}
signal(SIGQUIT, qflag);
if (name && name[0] == '-') {
interactive++;
if ((f = open(".profile", 0)) >= 0)
next(remap(f));
if ((f = open("/etc/profile", 0)) >= 0)
next(remap(f));
}
if (interactive)
signal(SIGTERM, sig);
if (signal(SIGINT, SIG_IGN) != SIG_IGN)
signal(SIGINT, onintr);
dolv = argv;
dolc = argc;
dolv[0] = name;
if (dolc > 1) {
for (ap = ++argv; --argc > 0;) {
if (assign(*ap = *argv++, !COPYV)) {
dolc--; /* keyword */
} else {
ap++;
}
}
}
setval(lookup("#"), putn((--dolc < 0) ? (dolc = 0) : dolc));
for (;;) {
if (interactive && e.iop <= iostack) {
#ifdef BB_FEATURE_COMMAND_EDITING
current_prompt=prompt->value;
#else
prs(prompt->value);
#endif
}
onecommand();
}
}
static void
setdash()
{
register char *cp;
register int c;
char m['z'-'a'+1];
cp = m;
for (c='a'; c<='z'; c++)
if (flag[c])
*cp++ = c;
*cp = 0;
setval(lookup("-"), m);
}
static int
newfile(s)
register char *s;
{
register int f;
if (strcmp(s, "-") != 0) {
f = open(s, 0);
if (f < 0) {
prs(s);
err(": cannot open");
return(1);
}
} else
f = 0;
next(remap(f));
return(0);
}
static void
onecommand()
{
register int i;
jmp_buf m1;
while (e.oenv)
quitenv();
areanum = 1;
freehere(areanum);
freearea(areanum);
garbage();
wdlist = 0;
iolist = 0;
e.errpt = 0;
e.linep = line;
yynerrs = 0;
multiline = 0;
inparse = 1;
intr = 0;
execflg = 0;
setjmp(failpt = m1); /* Bruce Evans' fix */
if (setjmp(failpt = m1) || yyparse() || intr) {
while (e.oenv)
quitenv();
scraphere();
if (!interactive && intr)
leave();
inparse = 0;
intr = 0;
return;
}
inparse = 0;
brklist = 0;
intr = 0;
execflg = 0;
if (!flag['n'])
execute(outtree, NOPIPE, NOPIPE, 0);
if (!interactive && intr) {
execflg = 0;
leave();
}
if ((i = trapset) != 0) {
trapset = 0;
runtrap(i);
}
}
static void
fail()
{
longjmp(failpt, 1);
/* NOTREACHED */
}
static void
leave()
{
if (execflg)
fail();
scraphere();
freehere(1);
runtrap(0);
exit(exstat);
/* NOTREACHED */
}
static void
warn(s)
register char *s;
{
if(*s) {
prs(s);
exstat = -1;
}
prs("\n");
if (flag['e'])
leave();
}
static void
err(s)
char *s;
{
warn(s);
if (flag['n'])
return;
if (!interactive)
leave();
if (e.errpt)
longjmp(e.errpt, 1);
closeall();
e.iop = e.iobase = iostack;
}
static int
newenv(f)
int f;
{
register struct env *ep;
if (f) {
quitenv();
return(1);
}
ep = (struct env *) space(sizeof(*ep));
if (ep == NULL) {
while (e.oenv)
quitenv();
fail();
}
*ep = e;
e.oenv = ep;
e.errpt = errpt;
return(0);
}
static void
quitenv()
{
register struct env *ep;
register int fd;
if ((ep = e.oenv) != NULL) {
fd = e.iofd;
e = *ep;
/* should close `'d files */
DELETE(ep);
while (--fd >= e.iofd)
close(fd);
}
}
/*
* Is any character from s1 in s2?
*/
static int
anys(s1, s2)
register char *s1, *s2;
{
while (*s1)
if (any(*s1++, s2))
return(1);
return(0);
}
/*
* Is character c in s?
*/
static int
any(c, s)
register int c;
register char *s;
{
while (*s)
if (*s++ == c)
return(1);
return(0);
}
static char *
putn(n)
register int n;
{
return(itoa(n, -1));
}
static char *
itoa(u, n)
register unsigned u;
int n;
{
register char *cp;
static char s[20];
int m;
m = 0;
if (n < 0 && (int) u < 0) {
m++;
u = -u;
}
cp = s+sizeof(s);
*--cp = 0;
do {
*--cp = u%10 + '0';
u /= 10;
} while (--n > 0 || u);
if (m)
*--cp = '-';
return(cp);
}
static void
next(f)
int f;
{
PUSHIO(afile, f, filechar);
}
static void
onintr(s)
int s; /* ANSI C requires a parameter */
{
signal(SIGINT, onintr);
intr = 1;
if (interactive) {
if (inparse) {
prs("\n");
fail();
}
}
else if (heedint) {
execflg = 0;
leave();
}
}
static char *
space(n)
int n;
{
register char *cp;
if ((cp = getcell(n)) == 0)
err("out of string space");
return(cp);
}
static char *
strsave(s, a)
register char *s;
int a;
{
register char *cp, *xp;
if ((cp = space(strlen(s)+1)) != NULL) {
setarea((char *)cp, a);
for (xp = cp; (*xp++ = *s++) != '\0';)
;
return(cp);
}
return("");
}
/*
* trap handling
*/
static void
sig(i)
register int i;
{
trapset = i;
signal(i, sig);
}
static void runtrap(i)
int i;
{
char *trapstr;
if ((trapstr = trap[i]) == NULL)
return;
if (i == 0)
trap[i] = 0;
RUN(aword, trapstr, nlchar);
}
/* -------- var.c -------- */
/*
* Find the given name in the dictionary
* and return its value. If the name was
* not previously there, enter it now and
* return a null value.
*/
static struct var *
lookup(n)
register char *n;
{
register struct var *vp;
register char *cp;
register int c;
static struct var dummy;
if (isdigit(*n)) {
dummy.name = n;
for (c = 0; isdigit(*n) && c < 1000; n++)
c = c*10 + *n-'0';
dummy.status = RONLY;
dummy.value = c <= dolc? dolv[c]: null;
return(&dummy);
}
for (vp = vlist; vp; vp = vp->next)
if (eqname(vp->name, n))
return(vp);
cp = findeq(n);
vp = (struct var *)space(sizeof(*vp));
if (vp == 0 || (vp->name = space((int)(cp-n)+2)) == 0) {
dummy.name = dummy.value = "";
return(&dummy);
}
for (cp = vp->name; (*cp = *n++) && *cp != '='; cp++)
;
if (*cp == 0)
*cp = '=';
*++cp = 0;
setarea((char *)vp, 0);
setarea((char *)vp->name, 0);
vp->value = null;
vp->next = vlist;
vp->status = GETCELL;
vlist = vp;
return(vp);
}
/*
* give variable at `vp' the value `val'.
*/
static void
setval(vp, val)
struct var *vp;
char *val;
{
nameval(vp, val, (char *)NULL);
}
/*
* if name is not NULL, it must be
* a prefix of the space `val',
* and end with `='.
* this is all so that exporting
* values is reasonably painless.
*/
static void
nameval(vp, val, name)
register struct var *vp;
char *val, *name;
{
register char *cp, *xp;
char *nv;
int fl;
if (vp->status & RONLY) {
for (xp = vp->name; *xp && *xp != '=';)
putc(*xp++, stderr);
err(" is read-only");
return;
}
fl = 0;
if (name == NULL) {
xp = space(strlen(vp->name)+strlen(val)+2);
if (xp == 0)
return;
/* make string: name=value */
setarea((char *)xp, 0);
name = xp;
for (cp = vp->name; (*xp = *cp++) && *xp!='='; xp++)
;
if (*xp++ == 0)
xp[-1] = '=';
nv = xp;
for (cp = val; (*xp++ = *cp++) != '\0';)
;
val = nv;
fl = GETCELL;
}
if (vp->status & GETCELL)
freecell(vp->name); /* form new string `name=value' */
vp->name = name;
vp->value = val;
vp->status |= fl;
}
static void
export(vp)
struct var *vp;
{
vp->status |= EXPORT;
}
static void
ronly(vp)
struct var *vp;
{
if (isalpha(vp->name[0])) /* not an internal symbol ($# etc) */
vp->status |= RONLY;
}
static int
isassign(s)
register char *s;
{
if (!isalpha((int)*s))
return(0);
for (; *s != '='; s++)
if (*s == 0 || !isalnum(*s))
return(0);
return(1);
}
static int
assign(s, cf)
register char *s;
int cf;
{
register char *cp;
struct var *vp;
if (!isalpha(*s))
return(0);
for (cp = s; *cp != '='; cp++)
if (*cp == 0 || !isalnum(*cp))
return(0);
vp = lookup(s);
nameval(vp, ++cp, cf == COPYV? (char *)NULL: s);
if (cf != COPYV)
vp->status &= ~GETCELL;
return(1);
}
static int
checkname(cp)
register char *cp;
{
if (!isalpha(*cp++))
return(0);
while (*cp)
if (!isalnum(*cp++))
return(0);
return(1);
}
static void
putvlist(f, out)
register int f, out;
{
register struct var *vp;
for (vp = vlist; vp; vp = vp->next)
if (vp->status & f && isalpha(*vp->name)) {
if (vp->status & EXPORT)
write(out, "export ", 7);
if (vp->status & RONLY)
write(out, "readonly ", 9);
write(out, vp->name, (int)(findeq(vp->name) - vp->name));
write(out, "\n", 1);
}
}
static int
eqname(n1, n2)
register char *n1, *n2;
{
for (; *n1 != '=' && *n1 != 0; n1++)
if (*n2++ != *n1)
return(0);
return(*n2 == 0 || *n2 == '=');
}
static char *
findeq(cp)
register char *cp;
{
while (*cp != '\0' && *cp != '=')
cp++;
return(cp);
}
/* -------- gmatch.c -------- */
/*
* int gmatch(string, pattern)
* char *string, *pattern;
*
* Match a pattern as in sh(1).
*/
#define CMASK 0377
#define QUOTE 0200
#define QMASK (CMASK&~QUOTE)
#define NOT '!' /* might use ^ */
static int
gmatch(s, p)
register char *s, *p;
{
register int sc, pc;
if (s == NULL || p == NULL)
return(0);
while ((pc = *p++ & CMASK) != '\0') {
sc = *s++ & QMASK;
switch (pc) {
case '[':
if ((p = cclass(p, sc)) == NULL)
return(0);
break;
case '?':
if (sc == 0)
return(0);
break;
case '*':
s--;
do {
if (*p == '\0' || gmatch(s, p))
return(1);
} while (*s++ != '\0');
return(0);
default:
if (sc != (pc&~QUOTE))
return(0);
}
}
return(*s == 0);
}
static char *
cclass(p, sub)
register char *p;
register int sub;
{
register int c, d, not, found;
if ((not = *p == NOT) != 0)
p++;
found = not;
do {
if (*p == '\0')
return((char *)NULL);
c = *p & CMASK;
if (p[1] == '-' && p[2] != ']') {
d = p[2] & CMASK;
p++;
} else
d = c;
if (c == sub || (c <= sub && sub <= d))
found = !not;
} while (*++p != ']');
return(found? p+1: (char *)NULL);
}
/* -------- area.c -------- */
/*
* All memory between (char *)areabot and (char *)(areatop+1) is
* exclusively administered by the area management routines.
* It is assumed that sbrk() and brk() manipulate the high end.
*/
#define sbrk(X) ({ void * __q = (void *)-1; if (brkaddr + (int)(X) < brktop) { __q = brkaddr; brkaddr+=(int)(X); } __q;})
static void
initarea()
{
brkaddr = malloc(65000);
brktop = brkaddr + 65000;
while ((int)sbrk(0) & ALIGN)
sbrk(1);
areabot = (struct region *)sbrk(REGSIZE);
areabot->next = areabot;
areabot->area = BUSY;
areatop = areabot;
areanxt = areabot;
}
char *
getcell(nbytes)
unsigned nbytes;
{
register int nregio;
register struct region *p, *q;
register int i;
if (nbytes == 0) {
puts("getcell(0)");
abort();
} /* silly and defeats the algorithm */
/*
* round upwards and add administration area
*/
nregio = (nbytes+(REGSIZE-1))/REGSIZE + 1;
for (p = areanxt;;) {
if (p->area > areanum) {
/*
* merge free cells
*/
while ((q = p->next)->area > areanum && q != areanxt)
p->next = q->next;
/*
* exit loop if cell big enough
*/
if (q >= p + nregio)
goto found;
}
p = p->next;
if (p == areanxt)
break;
}
i = nregio >= GROWBY ? nregio : GROWBY;
p = (struct region *)sbrk(i * REGSIZE);
if (p == (struct region *)-1)
return((char *)NULL);
p--;
if (p != areatop) {
puts("not contig");
abort(); /* allocated areas are contiguous */
}
q = p + i;
p->next = q;
p->area = FREE;
q->next = areabot;
q->area = BUSY;
areatop = q;
found:
/*
* we found a FREE area big enough, pointed to by 'p', and up to 'q'
*/
areanxt = p + nregio;
if (areanxt < q) {
/*
* split into requested area and rest
*/
if (areanxt+1 > q) {
puts("OOM");
abort(); /* insufficient space left for admin */
}
areanxt->next = q;
areanxt->area = FREE;
p->next = areanxt;
}
p->area = areanum;
return((char *)(p+1));
}
static void
freecell(cp)
char *cp;
{
register struct region *p;
if ((p = (struct region *)cp) != NULL) {
p--;
if (p < areanxt)
areanxt = p;
p->area = FREE;
}
}
static void
freearea(a)
register int a;
{
register struct region *p, *top;
top = areatop;
for (p = areabot; p != top; p = p->next)
if (p->area >= a)
p->area = FREE;
}
static void
setarea(cp,a)
char *cp;
int a;
{
register struct region *p;
if ((p = (struct region *)cp) != NULL)
(p-1)->area = a;
}
int
getarea(cp)
char *cp;
{
return ((struct region*)cp-1)->area;
}
static void
garbage()
{
register struct region *p, *q, *top;
top = areatop;
for (p = areabot; p != top; p = p->next) {
if (p->area > areanum) {
while ((q = p->next)->area > areanum)
p->next = q->next;
areanxt = p;
}
}
#ifdef SHRINKBY
if (areatop >= q + SHRINKBY && q->area > areanum) {
brk((char *)(q+1));
q->next = areabot;
q->area = BUSY;
areatop = q;
}
#endif
}
/* -------- csyn.c -------- */
/*
* shell: syntax (C version)
*/
int
yyparse()
{
startl = 1;
peeksym = 0;
yynerrs = 0;
outtree = c_list();
musthave('\n', 0);
return(yynerrs!=0);
}
static struct op *
pipeline(cf)
int cf;
{
register struct op *t, *p;
register int c;
t = command(cf);
if (t != NULL) {
while ((c = yylex(0)) == '|') {
if ((p = command(CONTIN)) == NULL)
SYNTAXERR;
if (t->type != TPAREN && t->type != TCOM) {
/* shell statement */
t = block(TPAREN, t, NOBLOCK, NOWORDS);
}
t = block(TPIPE, t, p, NOWORDS);
}
peeksym = c;
}
return(t);
}
static struct op *
andor()
{
register struct op *t, *p;
register int c;
t = pipeline(0);
if (t != NULL) {
while ((c = yylex(0)) == LOGAND || c == LOGOR) {
if ((p = pipeline(CONTIN)) == NULL)
SYNTAXERR;
t = block(c == LOGAND? TAND: TOR, t, p, NOWORDS);
}
peeksym = c;
}
return(t);
}
static struct op *
c_list()
{
register struct op *t, *p;
register int c;
t = andor();
if (t != NULL) {
if((peeksym = yylex(0)) == '&')
t = block(TASYNC, t, NOBLOCK, NOWORDS);
while ((c = yylex(0)) == ';' || c == '&' || (multiline && c == '\n')) {
if ((p = andor()) == NULL)
return(t);
if((peeksym = yylex(0)) == '&')
p = block(TASYNC, p, NOBLOCK, NOWORDS);
t = list(t, p);
}
peeksym = c;
}
return(t);
}
static int
synio(cf)
int cf;
{
register struct ioword *iop;
register int i;
register int c;
if ((c = yylex(cf)) != '<' && c != '>') {
peeksym = c;
return(0);
}
i = yylval.i;
musthave(WORD, 0);
iop = io(iounit, i, yylval.cp);
iounit = IODEFAULT;
if (i & IOHERE)
markhere(yylval.cp, iop);
return(1);
}
static void
musthave(c, cf)
int c, cf;
{
if ((peeksym = yylex(cf)) != c)
SYNTAXERR;
peeksym = 0;
}
static struct op *
simple()
{
register struct op *t;
t = NULL;
for (;;) {
switch (peeksym = yylex(0)) {
case '<':
case '>':
(void) synio(0);
break;
case WORD:
if (t == NULL) {
t = newtp();
t->type = TCOM;
}
peeksym = 0;
word(yylval.cp);
break;
default:
return(t);
}
}
}
static struct op *
nested(type, mark)
int type, mark;
{
register struct op *t;
multiline++;
t = c_list();
musthave(mark, 0);
multiline--;
return(block(type, t, NOBLOCK, NOWORDS));
}
static struct op *
command(cf)
int cf;
{
register struct op *t;
struct wdblock *iosave;
register int c;
iosave = iolist;
iolist = NULL;
if (multiline)
cf |= CONTIN;
while (synio(cf))
cf = 0;
switch (c = yylex(cf)) {
default:
peeksym = c;
if ((t = simple()) == NULL) {
if (iolist == NULL)
return((struct op *)NULL);
t = newtp();
t->type = TCOM;
}
break;
case '(':
t = nested(TPAREN, ')');
break;
case '{':
t = nested(TBRACE, '}');
break;
case FOR:
t = newtp();
t->type = TFOR;
musthave(WORD, 0);
startl = 1;
t->str = yylval.cp;
multiline++;
t->words = wordlist();
if ((c = yylex(0)) != '\n' && c != ';')
peeksym = c;
t->left = dogroup(0);
multiline--;
break;
case WHILE:
case UNTIL:
multiline++;
t = newtp();
t->type = c == WHILE? TWHILE: TUNTIL;
t->left = c_list();
t->right = dogroup(1);
t->words = NULL;
multiline--;
break;
case CASE:
t = newtp();
t->type = TCASE;
musthave(WORD, 0);
t->str = yylval.cp;
startl++;
multiline++;
musthave(IN, CONTIN);
startl++;
t->left = caselist();
musthave(ESAC, 0);
multiline--;
break;
case IF:
multiline++;
t = newtp();
t->type = TIF;
t->left = c_list();
t->right = thenpart();
musthave(FI, 0);
multiline--;
break;
}
while (synio(0))
;
t = namelist(t);
iolist = iosave;
return(t);
}
static struct op *
dogroup(onlydone)
int onlydone;
{
register int c;
register struct op *mylist;
c = yylex(CONTIN);
if (c == DONE && onlydone)
return((struct op *)NULL);
if (c != DO)
SYNTAXERR;
mylist = c_list();
musthave(DONE, 0);
return(mylist);
}
static struct op *
thenpart()
{
register int c;
register struct op *t;
if ((c = yylex(0)) != THEN) {
peeksym = c;
return((struct op *)NULL);
}
t = newtp();
t->type = 0;
t->left = c_list();
if (t->left == NULL)
SYNTAXERR;
t->right = elsepart();
return(t);
}
static struct op *
elsepart()
{
register int c;
register struct op *t;
switch (c = yylex(0)) {
case ELSE:
if ((t = c_list()) == NULL)
SYNTAXERR;
return(t);
case ELIF:
t = newtp();
t->type = TELIF;
t->left = c_list();
t->right = thenpart();
return(t);
default:
peeksym = c;
return((struct op *)NULL);
}
}
static struct op *
caselist()
{
register struct op *t;
t = NULL;
while ((peeksym = yylex(CONTIN)) != ESAC)
t = list(t, casepart());
return(t);
}
static struct op *
casepart()
{
register struct op *t;
t = newtp();
t->type = TPAT;
t->words = pattern();
musthave(')', 0);
t->left = c_list();
if ((peeksym = yylex(CONTIN)) != ESAC)
musthave(BREAK, CONTIN);
return(t);
}
static char **
pattern()
{
register int c, cf;
cf = CONTIN;
do {
musthave(WORD, cf);
word(yylval.cp);
cf = 0;
} while ((c = yylex(0)) == '|');
peeksym = c;
word(NOWORD);
return(copyw());
}
static char **
wordlist()
{
register int c;
if ((c = yylex(0)) != IN) {
peeksym = c;
return((char **)NULL);
}
startl = 0;
while ((c = yylex(0)) == WORD)
word(yylval.cp);
word(NOWORD);
peeksym = c;
return(copyw());
}
/*
* supporting functions
*/
static struct op *
list(t1, t2)
register struct op *t1, *t2;
{
if (t1 == NULL)
return(t2);
if (t2 == NULL)
return(t1);
return(block(TLIST, t1, t2, NOWORDS));
}
static struct op *
block(type, t1, t2, wp)
int type;
struct op *t1, *t2;
char **wp;
{
register struct op *t;
t = newtp();
t->type = type;
t->left = t1;
t->right = t2;
t->words = wp;
return(t);
}
static int
rlookup(n)
register char *n;
{
register struct res *rp;
for (rp = restab; rp->r_name; rp++)
if (strcmp(rp->r_name, n) == 0)
return(rp->r_val);
return(0);
}
static struct op *
newtp()
{
register struct op *t;
t = (struct op *)tree(sizeof(*t));
t->type = 0;
t->words = NULL;
t->ioact = NULL;
t->left = NULL;
t->right = NULL;
t->str = NULL;
return(t);
}
static struct op *
namelist(t)
register struct op *t;
{
if (iolist) {
iolist = addword((char *)NULL, iolist);
t->ioact = copyio();
} else
t->ioact = NULL;
if (t->type != TCOM) {
if (t->type != TPAREN && t->ioact != NULL) {
t = block(TPAREN, t, NOBLOCK, NOWORDS);
t->ioact = t->left->ioact;
t->left->ioact = NULL;
}
return(t);
}
word(NOWORD);
t->words = copyw();
return(t);
}
static char **
copyw()
{
register char **wd;
wd = getwords(wdlist);
wdlist = 0;
return(wd);
}
static void
word(cp)
char *cp;
{
wdlist = addword(cp, wdlist);
}
static struct ioword **
copyio()
{
register struct ioword **iop;
iop = (struct ioword **) getwords(iolist);
iolist = 0;
return(iop);
}
static struct ioword *
io(u, f, cp)
int u;
int f;
char *cp;
{
register struct ioword *iop;
iop = (struct ioword *) tree(sizeof(*iop));
iop->io_unit = u;
iop->io_flag = f;
iop->io_name = cp;
iolist = addword((char *)iop, iolist);
return(iop);
}
static void
zzerr()
{
yyerror("syntax error");
}
static void
yyerror(s)
char *s;
{
yynerrs++;
if (interactive && e.iop <= iostack) {
multiline = 0;
while (eofc() == 0 && yylex(0) != '\n')
;
}
err(s);
fail();
}
static int
yylex(cf)
int cf;
{
register int c, c1;
int atstart;
if ((c = peeksym) > 0) {
peeksym = 0;
if (c == '\n')
startl = 1;
return(c);
}
nlseen = 0;
e.linep = line;
atstart = startl;
startl = 0;
yylval.i = 0;
loop:
while ((c = my_getc(0)) == ' ' || c == '\t')
;
switch (c) {
default:
if (any(c, "0123456789")) {
unget(c1 = my_getc(0));
if (c1 == '<' || c1 == '>') {
iounit = c - '0';
goto loop;
}
*e.linep++ = c;
c = c1;
}
break;
case '#':
while ((c = my_getc(0)) != 0 && c != '\n')
;
unget(c);
goto loop;
case 0:
return(c);
case '$':
*e.linep++ = c;
if ((c = my_getc(0)) == '{') {
if ((c = collect(c, '}')) != '\0')
return(c);
goto pack;
}
break;
case '`':
case '\'':
case '"':
if ((c = collect(c, c)) != '\0')
return(c);
goto pack;
case '|':
case '&':
case ';':
if ((c1 = dual(c)) != '\0') {
startl = 1;
return(c1);
}
startl = 1;
return(c);
case '^':
startl = 1;
return('|');
case '>':
case '<':
diag(c);
return(c);
case '\n':
nlseen++;
gethere();
startl = 1;
if (multiline || cf & CONTIN) {
if (interactive && e.iop <= iostack) {
#ifdef BB_FEATURE_COMMAND_EDITING
current_prompt=cprompt->value;
#else
prs(cprompt->value);
#endif
}
if (cf & CONTIN)
goto loop;
}
return(c);
case '(':
case ')':
startl = 1;
return(c);
}
unget(c);
pack:
while ((c = my_getc(0)) != 0 && !any(c, "`$ '\"\t;&<>()|^\n"))
if (e.linep >= elinep)
err("word too long");
else
*e.linep++ = c;
unget(c);
if(any(c, "\"'`$"))
goto loop;
*e.linep++ = '\0';
if (atstart && (c = rlookup(line))!=0) {
startl = 1;
return(c);
}
yylval.cp = strsave(line, areanum);
return(WORD);
}
static int
collect(c, c1)
register int c, c1;
{
char s[2];
*e.linep++ = c;
while ((c = my_getc(c1)) != c1) {
if (c == 0) {
unget(c);
s[0] = c1;
s[1] = 0;
prs("no closing "); yyerror(s);
return(YYERRCODE);
}
if (interactive && c == '\n' && e.iop <= iostack) {
#ifdef BB_FEATURE_COMMAND_EDITING
current_prompt=cprompt->value;
#else
prs(cprompt->value);
#endif
}
*e.linep++ = c;
}
*e.linep++ = c;
return(0);
}
static int
dual(c)
register int c;
{
char s[3];
register char *cp = s;
*cp++ = c;
*cp++ = my_getc(0);
*cp = 0;
if ((c = rlookup(s)) == 0)
unget(*--cp);
return(c);
}
static void
diag(ec)
register int ec;
{
register int c;
c = my_getc(0);
if (c == '>' || c == '<') {
if (c != ec)
zzerr();
yylval.i = ec == '>'? IOWRITE|IOCAT: IOHERE;
c = my_getc(0);
} else
yylval.i = ec == '>'? IOWRITE: IOREAD;
if (c != '&' || yylval.i == IOHERE)
unget(c);
else
yylval.i |= IODUP;
}
static char *
tree(size)
unsigned size;
{
register char *t;
if ((t = getcell(size)) == NULL) {
prs("command line too complicated\n");
fail();
/* NOTREACHED */
}
return(t);
}
/* VARARGS1 */
/* ARGSUSED */
/* -------- exec.c -------- */
/*
* execute tree
*/
static int
execute(t, pin, pout, act)
register struct op *t;
int *pin, *pout;
int act;
{
register struct op *t1;
volatile int i, rv, a;
char *cp, **wp, **wp2;
struct var *vp;
struct brkcon bc;
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &wp;
#endif
if (t == NULL)
return(0);
rv = 0;
a = areanum++;
wp = (wp2 = t->words) != NULL
? eval(wp2, t->type == TCOM ? DOALL : DOALL & ~DOKEY)
: NULL;
switch(t->type) {
case TPAREN:
case TCOM:
{
int child;
rv = forkexec(t, pin, pout, act, wp, &child);
if (child) {
exstat = rv;
leave();
}
}
break;
case TPIPE:
{
int pv[2];
if ((rv = openpipe(pv)) < 0)
break;
pv[0] = remap(pv[0]);
pv[1] = remap(pv[1]);
(void) execute(t->left, pin, pv, 0);
rv = execute(t->right, pv, pout, 0);
}
break;
case TLIST:
(void) execute(t->left, pin, pout, 0);
rv = execute(t->right, pin, pout, 0);
break;
case TASYNC:
{
int hinteractive = interactive;
i = vfork();
if (i != 0) {
interactive = hinteractive;
if (i != -1) {
setval(lookup("!"), putn(i));
if (pin != NULL)
closepipe(pin);
if (interactive) {
prs(putn(i));
prs("\n");
}
} else
rv = -1;
setstatus(rv);
} else {
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
if (interactive)
signal(SIGTERM, SIG_DFL);
interactive = 0;
if (pin == NULL) {
close(0);
open("/dev/null", 0);
}
exit(execute(t->left, pin, pout, FEXEC));
}
}
break;
case TOR:
case TAND:
rv = execute(t->left, pin, pout, 0);
if ((t1 = t->right)!=NULL && (rv == 0) == (t->type == TAND))
rv = execute(t1, pin, pout, 0);
break;
case TFOR:
if (wp == NULL) {
wp = dolv+1;
if ((i = dolc) < 0)
i = 0;
} else {
i = -1;
while (*wp++ != NULL)
;
}
vp = lookup(t->str);
while (setjmp(bc.brkpt))
if (isbreak)
goto broken;
brkset(&bc);
for (t1 = t->left; i-- && *wp != NULL;) {
setval(vp, *wp++);
rv = execute(t1, pin, pout, 0);
}
brklist = brklist->nextlev;
break;
case TWHILE:
case TUNTIL:
while (setjmp(bc.brkpt))
if (isbreak)
goto broken;
brkset(&bc);
t1 = t->left;
while ((execute(t1, pin, pout, 0) == 0) == (t->type == TWHILE))
rv = execute(t->right, pin, pout, 0);
brklist = brklist->nextlev;
break;
case TIF:
case TELIF:
if (t->right != NULL) {
rv = !execute(t->left, pin, pout, 0) ?
execute(t->right->left, pin, pout, 0):
execute(t->right->right, pin, pout, 0);
}
break;
case TCASE:
if ((cp = evalstr(t->str, DOSUB|DOTRIM)) == 0)
cp = "";
if ((t1 = findcase(t->left, cp)) != NULL)
rv = execute(t1, pin, pout, 0);
break;
case TBRACE:
/*
if (iopp = t->ioact)
while (*iopp)
if (iosetup(*iopp++, pin!=NULL, pout!=NULL)) {
rv = -1;
break;
}
*/
if (rv >= 0 && (t1 = t->left))
rv = execute(t1, pin, pout, 0);
break;
}
broken:
t->words = wp2;
isbreak = 0;
freehere(areanum);
freearea(areanum);
areanum = a;
if (interactive && intr) {
closeall();
fail();
}
if ((i = trapset) != 0) {
trapset = 0;
runtrap(i);
}
return(rv);
}
static int
forkexec( register struct op *t, int *pin, int *pout, int act, char **wp, int *pforked)
{
int i, rv;
int (*shcom)() = NULL;
register int f;
char *cp = NULL;
struct ioword **iopp;
int resetsig;
char **owp;
int *hpin = pin;
int *hpout = pout;
int hforked;
char *hwp;
int hinteractive;
int hintr;
struct brkcon * hbrklist;
int hexecflg;
#if __GNUC__
/* Avoid longjmp clobbering */
(void) &pin;
(void) &pout;
(void) &wp;
(void) &shcom;
(void) &cp;
(void) &resetsig;
(void) &owp;
#endif
owp = wp;
resetsig = 0;
*pforked = 0;
rv = -1; /* system-detected error */
if (t->type == TCOM) {
while ((cp = *wp++) != NULL)
;
cp = *wp;
/* strip all initial assignments */
/* not correct wrt PATH=yyy command etc */
if (flag['x'])
echo (cp ? wp: owp);
if (cp == NULL && t->ioact == NULL) {
while ((cp = *owp++) != NULL && assign(cp, COPYV))
;
return(setstatus(0));
}
else if (cp != NULL)
shcom = inbuilt(cp);
}
t->words = wp;
f = act;
if (shcom == NULL && (f & FEXEC) == 0) {
hpin = pin;
hpout = pout;
hforked = *pforked;
hwp = *wp;
hinteractive = interactive;
hintr = intr;
hbrklist = brklist;
hexecflg = execflg;
i = vfork();
if (i != 0) {
/* who wrote this crappy non vfork safe shit? */
pin = hpin;
pout = hpout;
*pforked = hforked;
*wp = hwp;
interactive = hinteractive;
intr = hintr;
brklist = hbrklist;
execflg = hexecflg;
*pforked = 0;
if (i == -1)
return(rv);
if (pin != NULL)
closepipe(pin);
return(pout==NULL? setstatus(waitfor(i,0)): 0);
}
if (interactive) {
signal(SIGINT, SIG_IGN);
signal(SIGQUIT, SIG_IGN);
resetsig = 1;
}
interactive = 0;
intr = 0;
(*pforked)++;
brklist = 0;
execflg = 0;
}
if (owp != NULL)
while ((cp = *owp++) != NULL && assign(cp, COPYV))
if (shcom == NULL)
export(lookup(cp));
#ifdef COMPIPE
if ((pin != NULL || pout != NULL) && shcom != NULL && shcom != doexec) {
err("piping to/from shell builtins not yet done");
return(-1);
}
#endif
if (pin != NULL) {
dup2(pin[0], 0);
closepipe(pin);
}
if (pout != NULL) {
dup2(pout[1], 1);
closepipe(pout);
}
if ((iopp = t->ioact) != NULL) {
if (shcom != NULL && shcom != doexec) {
prs(cp);
err(": cannot redirect shell command");
return(-1);
}
while (*iopp)
if (iosetup(*iopp++, pin!=NULL, pout!=NULL))
return(rv);
}
if (shcom)
return(setstatus((*shcom)(t)));
/* should use FIOCEXCL */
for (i=FDBASE; i<NOFILE; i++)
close(i);
if (resetsig) {
signal(SIGINT, SIG_DFL);
signal(SIGQUIT, SIG_DFL);
}
if (t->type == TPAREN)
exit(execute(t->left, NOPIPE, NOPIPE, FEXEC));
if (wp[0] == NULL)
exit(0);
cp = rexecve(wp[0], wp, makenv());
prs(wp[0]); prs(": "); warn(cp);
if (!execflg)
trap[0] = NULL;
leave();
/* NOTREACHED */
exit(1);
}
/*
* 0< 1> are ignored as required
* within pipelines.
*/
static int
iosetup(iop, pipein, pipeout)
register struct ioword *iop;
int pipein, pipeout;
{
register int u = -1;
char *cp=NULL, *msg;
if (iop->io_unit == IODEFAULT) /* take default */
iop->io_unit = iop->io_flag&(IOREAD|IOHERE)? 0: 1;
if (pipein && iop->io_unit == 0)
return(0);
if (pipeout && iop->io_unit == 1)
return(0);
msg = iop->io_flag&(IOREAD|IOHERE)? "open": "create";
if ((iop->io_flag & IOHERE) == 0) {
cp = iop->io_name;
if ((cp = evalstr(cp, DOSUB|DOTRIM)) == NULL)
return(1);
}
if (iop->io_flag & IODUP) {
if (cp[1] || (!isdigit(*cp) && *cp != '-')) {
prs(cp);
err(": illegal >& argument");
return(1);
}
if (*cp == '-')
iop->io_flag = IOCLOSE;
iop->io_flag &= ~(IOREAD|IOWRITE);
}
switch (iop->io_flag) {
case IOREAD:
u = open(cp, 0);
break;
case IOHERE:
case IOHERE|IOXHERE:
u = herein(iop->io_name, iop->io_flag&IOXHERE);
cp = "here file";
break;
case IOWRITE|IOCAT:
if ((u = open(cp, 1)) >= 0) {
lseek(u, (long)0, 2);
break;
}
case IOWRITE:
u = creat(cp, 0666);
break;
case IODUP:
u = dup2(*cp-'0', iop->io_unit);
break;
case IOCLOSE:
close(iop->io_unit);
return(0);
}
if (u < 0) {
prs(cp);
prs(": cannot ");
warn(msg);
return(1);
} else {
if (u != iop->io_unit) {
dup2(u, iop->io_unit);
close(u);
}
}
return(0);
}
static void
echo(wp)
register char **wp;
{
register int i;
prs("+");
for (i=0; wp[i]; i++) {
if (i)
prs(" ");
prs(wp[i]);
}
prs("\n");
}
static struct op **
find1case(t, w)
struct op *t;
char *w;
{
register struct op *t1;
struct op **tp;
register char **wp, *cp;
if (t == NULL)
return((struct op **)NULL);
if (t->type == TLIST) {
if ((tp = find1case(t->left, w)) != NULL)
return(tp);
t1 = t->right; /* TPAT */
} else
t1 = t;
for (wp = t1->words; *wp;)
if ((cp = evalstr(*wp++, DOSUB)) && gmatch(w, cp))