blob: 73e095cf84be1615267bc8dcc9f6d67d9681ac9f [file] [log] [blame]
/* vi: set sw=4 ts=4: */
/*
* tiny vi.c: A small 'vi' clone
* Copyright (C) 2000, 2001 Sterling Huxley <sterling@europa.com>
*
* Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
*/
/*
* Things To Do:
* EXINIT
* $HOME/.exrc and ./.exrc
* add magic to search /foo.*bar
* add :help command
* :map macros
* if mark[] values were line numbers rather than pointers
* it would be easier to change the mark when add/delete lines
* More intelligence in refresh()
* ":r !cmd" and "!cmd" to filter text through an external command
* A true "undo" facility
* An "ex" line oriented mode- maybe using "cmdedit"
*/
#include "libbb.h"
/* the CRASHME code is unmaintained, and doesn't currently build */
#define ENABLE_FEATURE_VI_CRASHME 0
#if ENABLE_LOCALE_SUPPORT
#if ENABLE_FEATURE_VI_8BIT
//FIXME: this does not work properly for Unicode anyway
# define Isprint(c) (isprint)(c)
#else
# define Isprint(c) isprint_asciionly(c)
#endif
#else
/* 0x9b is Meta-ESC */
#if ENABLE_FEATURE_VI_8BIT
#define Isprint(c) ((unsigned char)(c) >= ' ' && (c) != 0x7f && (unsigned char)(c) != 0x9b)
#else
#define Isprint(c) ((unsigned char)(c) >= ' ' && (unsigned char)(c) < 0x7f)
#endif
#endif
enum {
MAX_TABSTOP = 32, // sanity limit
// User input len. Need not be extra big.
// Lines in file being edited *can* be bigger than this.
MAX_INPUT_LEN = 128,
// Sanity limits. We have only one buffer of this size.
MAX_SCR_COLS = CONFIG_FEATURE_VI_MAX_LEN,
MAX_SCR_ROWS = CONFIG_FEATURE_VI_MAX_LEN,
};
/* vt102 typical ESC sequence */
/* terminal standout start/normal ESC sequence */
#define SOs "\033[7m"
#define SOn "\033[0m"
/* terminal bell sequence */
#define bell "\007"
/* Clear-end-of-line and Clear-end-of-screen ESC sequence */
#define Ceol "\033[K"
#define Ceos "\033[J"
/* Cursor motion arbitrary destination ESC sequence */
#define CMrc "\033[%u;%uH"
/* Cursor motion up and down ESC sequence */
#define CMup "\033[A"
#define CMdown "\n"
#if ENABLE_FEATURE_VI_DOT_CMD || ENABLE_FEATURE_VI_YANKMARK
// cmds modifying text[]
// vda: removed "aAiIs" as they switch us into insert mode
// and remembering input for replay after them makes no sense
static const char modifying_cmds[] = "cCdDJoOpPrRxX<>~";
#endif
enum {
YANKONLY = FALSE,
YANKDEL = TRUE,
FORWARD = 1, // code depends on "1" for array index
BACK = -1, // code depends on "-1" for array index
LIMITED = 0, // how much of text[] in char_search
FULL = 1, // how much of text[] in char_search
S_BEFORE_WS = 1, // used in skip_thing() for moving "dot"
S_TO_WS = 2, // used in skip_thing() for moving "dot"
S_OVER_WS = 3, // used in skip_thing() for moving "dot"
S_END_PUNCT = 4, // used in skip_thing() for moving "dot"
S_END_ALNUM = 5, // used in skip_thing() for moving "dot"
};
/* vi.c expects chars to be unsigned. */
/* busybox build system provides that, but it's better */
/* to audit and fix the source */
struct globals {
/* many references - keep near the top of globals */
char *text, *end; // pointers to the user data in memory
char *dot; // where all the action takes place
int text_size; // size of the allocated buffer
/* the rest */
smallint vi_setops;
#define VI_AUTOINDENT 1
#define VI_SHOWMATCH 2
#define VI_IGNORECASE 4
#define VI_ERR_METHOD 8
#define autoindent (vi_setops & VI_AUTOINDENT)
#define showmatch (vi_setops & VI_SHOWMATCH )
#define ignorecase (vi_setops & VI_IGNORECASE)
/* indicate error with beep or flash */
#define err_method (vi_setops & VI_ERR_METHOD)
#if ENABLE_FEATURE_VI_READONLY
smallint readonly_mode;
#define SET_READONLY_FILE(flags) ((flags) |= 0x01)
#define SET_READONLY_MODE(flags) ((flags) |= 0x02)
#define UNSET_READONLY_FILE(flags) ((flags) &= 0xfe)
#else
#define SET_READONLY_FILE(flags) ((void)0)
#define SET_READONLY_MODE(flags) ((void)0)
#define UNSET_READONLY_FILE(flags) ((void)0)
#endif
smallint editing; // >0 while we are editing a file
// [code audit says "can be 0, 1 or 2 only"]
smallint cmd_mode; // 0=command 1=insert 2=replace
int file_modified; // buffer contents changed (counter, not flag!)
int last_file_modified; // = -1;
int fn_start; // index of first cmd line file name
int save_argc; // how many file names on cmd line
int cmdcnt; // repetition count
unsigned rows, columns; // the terminal screen is this size
#if ENABLE_FEATURE_VI_ASK_TERMINAL
int get_rowcol_error;
#endif
int crow, ccol; // cursor is on Crow x Ccol
int offset; // chars scrolled off the screen to the left
int have_status_msg; // is default edit status needed?
// [don't make smallint!]
int last_status_cksum; // hash of current status line
char *current_filename;
char *screenbegin; // index into text[], of top line on the screen
char *screen; // pointer to the virtual screen buffer
int screensize; // and its size
int tabstop;
int last_forward_char; // last char searched for with 'f' (int because of Unicode)
char erase_char; // the users erase character
char last_input_char; // last char read from user
#if ENABLE_FEATURE_VI_DOT_CMD
smallint adding2q; // are we currently adding user input to q
int lmc_len; // length of last_modifying_cmd
char *ioq, *ioq_start; // pointer to string for get_one_char to "read"
#endif
#if ENABLE_FEATURE_VI_OPTIMIZE_CURSOR
int last_row; // where the cursor was last moved to
#endif
#if ENABLE_FEATURE_VI_USE_SIGNALS || ENABLE_FEATURE_VI_CRASHME
int my_pid;
#endif
#if ENABLE_FEATURE_VI_SEARCH
char *last_search_pattern; // last pattern from a '/' or '?' search
#endif
/* former statics */
#if ENABLE_FEATURE_VI_YANKMARK
char *edit_file__cur_line;
#endif
int refresh__old_offset;
int format_edit_status__tot;
/* a few references only */
#if ENABLE_FEATURE_VI_YANKMARK
int YDreg, Ureg; // default delete register and orig line for "U"
char *reg[28]; // named register a-z, "D", and "U" 0-25,26,27
char *mark[28]; // user marks points somewhere in text[]- a-z and previous context ''
char *context_start, *context_end;
#endif
#if ENABLE_FEATURE_VI_USE_SIGNALS
sigjmp_buf restart; // catch_sig()
#endif
struct termios term_orig, term_vi; // remember what the cooked mode was
#if ENABLE_FEATURE_VI_COLON
char *initial_cmds[3]; // currently 2 entries, NULL terminated
#endif
// Should be just enough to hold a key sequence,
// but CRASHME mode uses it as generated command buffer too
#if ENABLE_FEATURE_VI_CRASHME
char readbuffer[128];
#else
char readbuffer[KEYCODE_BUFFER_SIZE];
#endif
#define STATUS_BUFFER_LEN 200
char status_buffer[STATUS_BUFFER_LEN]; // messages to the user
#if ENABLE_FEATURE_VI_DOT_CMD
char last_modifying_cmd[MAX_INPUT_LEN]; // last modifying cmd for "."
#endif
char get_input_line__buf[MAX_INPUT_LEN]; /* former static */
char scr_out_buf[MAX_SCR_COLS + MAX_TABSTOP * 2];
};
#define G (*ptr_to_globals)
#define text (G.text )
#define text_size (G.text_size )
#define end (G.end )
#define dot (G.dot )
#define reg (G.reg )
#define vi_setops (G.vi_setops )
#define editing (G.editing )
#define cmd_mode (G.cmd_mode )
#define file_modified (G.file_modified )
#define last_file_modified (G.last_file_modified )
#define fn_start (G.fn_start )
#define save_argc (G.save_argc )
#define cmdcnt (G.cmdcnt )
#define rows (G.rows )
#define columns (G.columns )
#define crow (G.crow )
#define ccol (G.ccol )
#define offset (G.offset )
#define status_buffer (G.status_buffer )
#define have_status_msg (G.have_status_msg )
#define last_status_cksum (G.last_status_cksum )
#define current_filename (G.current_filename )
#define screen (G.screen )
#define screensize (G.screensize )
#define screenbegin (G.screenbegin )
#define tabstop (G.tabstop )
#define last_forward_char (G.last_forward_char )
#define erase_char (G.erase_char )
#define last_input_char (G.last_input_char )
#if ENABLE_FEATURE_VI_READONLY
#define readonly_mode (G.readonly_mode )
#else
#define readonly_mode 0
#endif
#define adding2q (G.adding2q )
#define lmc_len (G.lmc_len )
#define ioq (G.ioq )
#define ioq_start (G.ioq_start )
#define last_row (G.last_row )
#define my_pid (G.my_pid )
#define last_search_pattern (G.last_search_pattern)
#define edit_file__cur_line (G.edit_file__cur_line)
#define refresh__old_offset (G.refresh__old_offset)
#define format_edit_status__tot (G.format_edit_status__tot)
#define YDreg (G.YDreg )
#define Ureg (G.Ureg )
#define mark (G.mark )
#define context_start (G.context_start )
#define context_end (G.context_end )
#define restart (G.restart )
#define term_orig (G.term_orig )
#define term_vi (G.term_vi )
#define initial_cmds (G.initial_cmds )
#define readbuffer (G.readbuffer )
#define scr_out_buf (G.scr_out_buf )
#define last_modifying_cmd (G.last_modifying_cmd )
#define get_input_line__buf (G.get_input_line__buf)
#define INIT_G() do { \
SET_PTR_TO_GLOBALS(xzalloc(sizeof(G))); \
last_file_modified = -1; \
/* "" but has space for 2 chars: */ \
IF_FEATURE_VI_SEARCH(last_search_pattern = xzalloc(2);) \
} while (0)
static int init_text_buffer(char *); // init from file or create new
static void edit_file(char *); // edit one file
static void do_cmd(int); // execute a command
static int next_tabstop(int);
static void sync_cursor(char *, int *, int *); // synchronize the screen cursor to dot
static char *begin_line(char *); // return pointer to cur line B-o-l
static char *end_line(char *); // return pointer to cur line E-o-l
static char *prev_line(char *); // return pointer to prev line B-o-l
static char *next_line(char *); // return pointer to next line B-o-l
static char *end_screen(void); // get pointer to last char on screen
static int count_lines(char *, char *); // count line from start to stop
static char *find_line(int); // find begining of line #li
static char *move_to_col(char *, int); // move "p" to column l
static void dot_left(void); // move dot left- dont leave line
static void dot_right(void); // move dot right- dont leave line
static void dot_begin(void); // move dot to B-o-l
static void dot_end(void); // move dot to E-o-l
static void dot_next(void); // move dot to next line B-o-l
static void dot_prev(void); // move dot to prev line B-o-l
static void dot_scroll(int, int); // move the screen up or down
static void dot_skip_over_ws(void); // move dot pat WS
static void dot_delete(void); // delete the char at 'dot'
static char *bound_dot(char *); // make sure text[0] <= P < "end"
static char *new_screen(int, int); // malloc virtual screen memory
static char *char_insert(char *, char); // insert the char c at 'p'
// might reallocate text[]! use p += stupid_insert(p, ...),
// and be careful to not use pointers into potentially freed text[]!
static uintptr_t stupid_insert(char *, char); // stupidly insert the char c at 'p'
static int find_range(char **, char **, char); // return pointers for an object
static int st_test(char *, int, int, char *); // helper for skip_thing()
static char *skip_thing(char *, int, int, int); // skip some object
static char *find_pair(char *, char); // find matching pair () [] {}
static char *text_hole_delete(char *, char *); // at "p", delete a 'size' byte hole
// might reallocate text[]! use p += text_hole_make(p, ...),
// and be careful to not use pointers into potentially freed text[]!
static uintptr_t text_hole_make(char *, int); // at "p", make a 'size' byte hole
static char *yank_delete(char *, char *, int, int); // yank text[] into register then delete
static void show_help(void); // display some help info
static void rawmode(void); // set "raw" mode on tty
static void cookmode(void); // return to "cooked" mode on tty
// sleep for 'h' 1/100 seconds, return 1/0 if stdin is (ready for read)/(not ready)
static int mysleep(int);
static int readit(void); // read (maybe cursor) key from stdin
static int get_one_char(void); // read 1 char from stdin
static int file_size(const char *); // what is the byte size of "fn"
#if !ENABLE_FEATURE_VI_READONLY
#define file_insert(fn, p, update_ro_status) file_insert(fn, p)
#endif
// file_insert might reallocate text[]!
static int file_insert(const char *, char *, int);
static int file_write(char *, char *, char *);
#if !ENABLE_FEATURE_VI_OPTIMIZE_CURSOR
#define place_cursor(a, b, optimize) place_cursor(a, b)
#endif
static void place_cursor(int, int, int);
static void screen_erase(void);
static void clear_to_eol(void);
static void clear_to_eos(void);
static void go_bottom_and_clear_to_eol(void);
static void standout_start(void); // send "start reverse video" sequence
static void standout_end(void); // send "end reverse video" sequence
static void flash(int); // flash the terminal screen
static void show_status_line(void); // put a message on the bottom line
static void status_line(const char *, ...); // print to status buf
static void status_line_bold(const char *, ...);
static void not_implemented(const char *); // display "Not implemented" message
static int format_edit_status(void); // format file status on status line
static void redraw(int); // force a full screen refresh
static char* format_line(char* /*, int*/);
static void refresh(int); // update the terminal from screen[]
static void Indicate_Error(void); // use flash or beep to indicate error
#define indicate_error(c) Indicate_Error()
static void Hit_Return(void);
#if ENABLE_FEATURE_VI_SEARCH
static char *char_search(char *, const char *, int, int); // search for pattern starting at p
static int mycmp(const char *, const char *, int); // string cmp based in "ignorecase"
#endif
#if ENABLE_FEATURE_VI_COLON
static char *get_one_address(char *, int *); // get colon addr, if present
static char *get_address(char *, int *, int *); // get two colon addrs, if present
static void colon(char *); // execute the "colon" mode cmds
#endif
#if ENABLE_FEATURE_VI_USE_SIGNALS
static void winch_sig(int); // catch window size changes
static void suspend_sig(int); // catch ctrl-Z
static void catch_sig(int); // catch ctrl-C and alarm time-outs
#endif
#if ENABLE_FEATURE_VI_DOT_CMD
static void start_new_cmd_q(char); // new queue for command
static void end_cmd_q(void); // stop saving input chars
#else
#define end_cmd_q() ((void)0)
#endif
#if ENABLE_FEATURE_VI_SETOPTS
static void showmatching(char *); // show the matching pair () [] {}
#endif
#if ENABLE_FEATURE_VI_YANKMARK || (ENABLE_FEATURE_VI_COLON && ENABLE_FEATURE_VI_SEARCH) || ENABLE_FEATURE_VI_CRASHME
// might reallocate text[]! use p += string_insert(p, ...),
// and be careful to not use pointers into potentially freed text[]!
static uintptr_t string_insert(char *, const char *); // insert the string at 'p'
#endif
#if ENABLE_FEATURE_VI_YANKMARK
static char *text_yank(char *, char *, int); // save copy of "p" into a register
static char what_reg(void); // what is letter of current YDreg
static void check_context(char); // remember context for '' command
#endif
#if ENABLE_FEATURE_VI_CRASHME
static void crash_dummy();
static void crash_test();
static int crashme = 0;
#endif
static void write1(const char *out)
{
fputs(out, stdout);
}
int vi_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int vi_main(int argc, char **argv)
{
int c;
INIT_G();
#if ENABLE_FEATURE_VI_USE_SIGNALS || ENABLE_FEATURE_VI_CRASHME
my_pid = getpid();
#endif
#if ENABLE_FEATURE_VI_CRASHME
srand((long) my_pid);
#endif
#ifdef NO_SUCH_APPLET_YET
/* If we aren't "vi", we are "view" */
if (ENABLE_FEATURE_VI_READONLY && applet_name[2]) {
SET_READONLY_MODE(readonly_mode);
}
#endif
vi_setops = VI_AUTOINDENT | VI_SHOWMATCH | VI_IGNORECASE;
// 1- process $HOME/.exrc file (not inplemented yet)
// 2- process EXINIT variable from environment
// 3- process command line args
#if ENABLE_FEATURE_VI_COLON
{
char *p = getenv("EXINIT");
if (p && *p)
initial_cmds[0] = xstrndup(p, MAX_INPUT_LEN);
}
#endif
while ((c = getopt(argc, argv, "hCRH" IF_FEATURE_VI_COLON("c:"))) != -1) {
switch (c) {
#if ENABLE_FEATURE_VI_CRASHME
case 'C':
crashme = 1;
break;
#endif
#if ENABLE_FEATURE_VI_READONLY
case 'R': // Read-only flag
SET_READONLY_MODE(readonly_mode);
break;
#endif
#if ENABLE_FEATURE_VI_COLON
case 'c': // cmd line vi command
if (*optarg)
initial_cmds[initial_cmds[0] != 0] = xstrndup(optarg, MAX_INPUT_LEN);
break;
#endif
case 'H':
show_help();
/* fall through */
default:
bb_show_usage();
return 1;
}
}
// The argv array can be used by the ":next" and ":rewind" commands
// save optind.
fn_start = optind; // remember first file name for :next and :rew
save_argc = argc;
//----- This is the main file handling loop --------------
while (1) {
edit_file(argv[optind]); /* param might be NULL */
if (++optind >= argc)
break;
}
//-----------------------------------------------------------
return 0;
}
/* read text from file or create an empty buf */
/* will also update current_filename */
static int init_text_buffer(char *fn)
{
int rc;
int size = file_size(fn); // file size. -1 means does not exist.
/* allocate/reallocate text buffer */
free(text);
text_size = size + 10240;
screenbegin = dot = end = text = xzalloc(text_size);
if (fn != current_filename) {
free(current_filename);
current_filename = xstrdup(fn);
}
if (size < 0) {
// file dont exist. Start empty buf with dummy line
char_insert(text, '\n');
rc = 0;
} else {
rc = file_insert(fn, text, 1);
}
file_modified = 0;
last_file_modified = -1;
#if ENABLE_FEATURE_VI_YANKMARK
/* init the marks. */
memset(mark, 0, sizeof(mark));
#endif
return rc;
}
#if ENABLE_FEATURE_VI_WIN_RESIZE
static int query_screen_dimensions(void)
{
int err = get_terminal_width_height(STDIN_FILENO, &columns, &rows);
if (rows > MAX_SCR_ROWS)
rows = MAX_SCR_ROWS;
if (columns > MAX_SCR_COLS)
columns = MAX_SCR_COLS;
return err;
}
#else
# define query_screen_dimensions() (0)
#endif
static void edit_file(char *fn)
{
#if ENABLE_FEATURE_VI_YANKMARK
#define cur_line edit_file__cur_line
#endif
int c;
int size;
#if ENABLE_FEATURE_VI_USE_SIGNALS
int sig;
#endif
editing = 1; // 0 = exit, 1 = one file, 2 = multiple files
rawmode();
rows = 24;
columns = 80;
size = 0;
IF_FEATURE_VI_ASK_TERMINAL(G.get_rowcol_error =) query_screen_dimensions();
#if ENABLE_FEATURE_VI_ASK_TERMINAL
if (G.get_rowcol_error /* TODO? && no input on stdin */) {
uint64_t k;
write1("\033[999;999H" "\033[6n");
fflush_all();
k = read_key(STDIN_FILENO, readbuffer, /*timeout_ms:*/ 100);
if ((int32_t)k == KEYCODE_CURSOR_POS) {
uint32_t rc = (k >> 32);
columns = (rc & 0x7fff);
if (columns > MAX_SCR_COLS)
columns = MAX_SCR_COLS;
rows = ((rc >> 16) & 0x7fff);
if (rows > MAX_SCR_ROWS)
rows = MAX_SCR_ROWS;
}
}
#endif
new_screen(rows, columns); // get memory for virtual screen
init_text_buffer(fn);
#if ENABLE_FEATURE_VI_YANKMARK
YDreg = 26; // default Yank/Delete reg
Ureg = 27; // hold orig line for "U" cmd
mark[26] = mark[27] = text; // init "previous context"
#endif
last_forward_char = last_input_char = '\0';
crow = 0;
ccol = 0;
#if ENABLE_FEATURE_VI_USE_SIGNALS
signal(SIGINT, catch_sig);
signal(SIGWINCH, winch_sig);
signal(SIGTSTP, suspend_sig);
sig = sigsetjmp(restart, 1);
if (sig != 0) {
screenbegin = dot = text;
}
#endif
cmd_mode = 0; // 0=command 1=insert 2='R'eplace
cmdcnt = 0;
tabstop = 8;
offset = 0; // no horizontal offset
c = '\0';
#if ENABLE_FEATURE_VI_DOT_CMD
free(ioq_start);
ioq = ioq_start = NULL;
lmc_len = 0;
adding2q = 0;
#endif
#if ENABLE_FEATURE_VI_COLON
{
char *p, *q;
int n = 0;
while ((p = initial_cmds[n]) != NULL) {
do {
q = p;
p = strchr(q, '\n');
if (p)
while (*p == '\n')
*p++ = '\0';
if (*q)
colon(q);
} while (p);
free(initial_cmds[n]);
initial_cmds[n] = NULL;
n++;
}
}
#endif
redraw(FALSE); // dont force every col re-draw
//------This is the main Vi cmd handling loop -----------------------
while (editing > 0) {
#if ENABLE_FEATURE_VI_CRASHME
if (crashme > 0) {
if ((end - text) > 1) {
crash_dummy(); // generate a random command
} else {
crashme = 0;
string_insert(text, "\n\n##### Ran out of text to work on. #####\n\n"); // insert the string
dot = text;
refresh(FALSE);
}
}
#endif
last_input_char = c = get_one_char(); // get a cmd from user
#if ENABLE_FEATURE_VI_YANKMARK
// save a copy of the current line- for the 'U" command
if (begin_line(dot) != cur_line) {
cur_line = begin_line(dot);
text_yank(begin_line(dot), end_line(dot), Ureg);
}
#endif
#if ENABLE_FEATURE_VI_DOT_CMD
// These are commands that change text[].
// Remember the input for the "." command
if (!adding2q && ioq_start == NULL
&& cmd_mode == 0 // command mode
&& c > '\0' // exclude NUL and non-ASCII chars
&& c < 0x7f // (Unicode and such)
&& strchr(modifying_cmds, c)
) {
start_new_cmd_q(c);
}
#endif
do_cmd(c); // execute the user command
// poll to see if there is input already waiting. if we are
// not able to display output fast enough to keep up, skip
// the display update until we catch up with input.
if (!readbuffer[0] && mysleep(0) == 0) {
// no input pending - so update output
refresh(FALSE);
show_status_line();
}
#if ENABLE_FEATURE_VI_CRASHME
if (crashme > 0)
crash_test(); // test editor variables
#endif
}
//-------------------------------------------------------------------
go_bottom_and_clear_to_eol();
cookmode();
#undef cur_line
}
//----- The Colon commands -------------------------------------
#if ENABLE_FEATURE_VI_COLON
static char *get_one_address(char *p, int *addr) // get colon addr, if present
{
int st;
char *q;
IF_FEATURE_VI_YANKMARK(char c;)
IF_FEATURE_VI_SEARCH(char *pat;)
*addr = -1; // assume no addr
if (*p == '.') { // the current line
p++;
q = begin_line(dot);
*addr = count_lines(text, q);
}
#if ENABLE_FEATURE_VI_YANKMARK
else if (*p == '\'') { // is this a mark addr
p++;
c = tolower(*p);
p++;
if (c >= 'a' && c <= 'z') {
// we have a mark
c = c - 'a';
q = mark[(unsigned char) c];
if (q != NULL) { // is mark valid
*addr = count_lines(text, q);
}
}
}
#endif
#if ENABLE_FEATURE_VI_SEARCH
else if (*p == '/') { // a search pattern
q = strchrnul(++p, '/');
pat = xstrndup(p, q - p); // save copy of pattern
p = q;
if (*p == '/')
p++;
q = char_search(dot, pat, FORWARD, FULL);
if (q != NULL) {
*addr = count_lines(text, q);
}
free(pat);
}
#endif
else if (*p == '$') { // the last line in file
p++;
q = begin_line(end - 1);
*addr = count_lines(text, q);
} else if (isdigit(*p)) { // specific line number
sscanf(p, "%d%n", addr, &st);
p += st;
} else {
// unrecognized address - assume -1
*addr = -1;
}
return p;
}
static char *get_address(char *p, int *b, int *e) // get two colon addrs, if present
{
//----- get the address' i.e., 1,3 'a,'b -----
// get FIRST addr, if present
while (isblank(*p))
p++; // skip over leading spaces
if (*p == '%') { // alias for 1,$
p++;
*b = 1;
*e = count_lines(text, end-1);
goto ga0;
}
p = get_one_address(p, b);
while (isblank(*p))
p++;
if (*p == ',') { // is there a address separator
p++;
while (isblank(*p))
p++;
// get SECOND addr, if present
p = get_one_address(p, e);
}
ga0:
while (isblank(*p))
p++; // skip over trailing spaces
return p;
}
#if ENABLE_FEATURE_VI_SET && ENABLE_FEATURE_VI_SETOPTS
static void setops(const char *args, const char *opname, int flg_no,
const char *short_opname, int opt)
{
const char *a = args + flg_no;
int l = strlen(opname) - 1; /* opname have + ' ' */
// maybe strncmp? we had tons of erroneous strncasecmp's...
if (strncasecmp(a, opname, l) == 0
|| strncasecmp(a, short_opname, 2) == 0
) {
if (flg_no)
vi_setops &= ~opt;
else
vi_setops |= opt;
}
}
#endif
// buf must be no longer than MAX_INPUT_LEN!
static void colon(char *buf)
{
char c, *orig_buf, *buf1, *q, *r;
char *fn, cmd[MAX_INPUT_LEN], args[MAX_INPUT_LEN];
int i, l, li, ch, b, e;
int useforce, forced = FALSE;
// :3154 // if (-e line 3154) goto it else stay put
// :4,33w! foo // write a portion of buffer to file "foo"
// :w // write all of buffer to current file
// :q // quit
// :q! // quit- dont care about modified file
// :'a,'z!sort -u // filter block through sort
// :'f // goto mark "f"
// :'fl // list literal the mark "f" line
// :.r bar // read file "bar" into buffer before dot
// :/123/,/abc/d // delete lines from "123" line to "abc" line
// :/xyz/ // goto the "xyz" line
// :s/find/replace/ // substitute pattern "find" with "replace"
// :!<cmd> // run <cmd> then return
//
if (!buf[0])
goto ret;
if (*buf == ':')
buf++; // move past the ':'
li = ch = i = 0;
b = e = -1;
q = text; // assume 1,$ for the range
r = end - 1;
li = count_lines(text, end - 1);
fn = current_filename;
// look for optional address(es) :. :1 :1,9 :'q,'a :%
buf = get_address(buf, &b, &e);
// remember orig command line
orig_buf = buf;
// get the COMMAND into cmd[]
buf1 = cmd;
while (*buf != '\0') {
if (isspace(*buf))
break;
*buf1++ = *buf++;
}
*buf1 = '\0';
// get any ARGuments
while (isblank(*buf))
buf++;
strcpy(args, buf);
useforce = FALSE;
buf1 = last_char_is(cmd, '!');
if (buf1) {
useforce = TRUE;
*buf1 = '\0'; // get rid of !
}
if (b >= 0) {
// if there is only one addr, then the addr
// is the line number of the single line the
// user wants. So, reset the end
// pointer to point at end of the "b" line
q = find_line(b); // what line is #b
r = end_line(q);
li = 1;
}
if (e >= 0) {
// we were given two addrs. change the
// end pointer to the addr given by user.
r = find_line(e); // what line is #e
r = end_line(r);
li = e - b + 1;
}
// ------------ now look for the command ------------
i = strlen(cmd);
if (i == 0) { // :123CR goto line #123
if (b >= 0) {
dot = find_line(b); // what line is #b
dot_skip_over_ws();
}
}
#if ENABLE_FEATURE_ALLOW_EXEC
else if (cmd[0] == '!') { // run a cmd
int retcode;
// :!ls run the <cmd>
go_bottom_and_clear_to_eol();
cookmode();
retcode = system(orig_buf + 1); // run the cmd
if (retcode)
printf("\nshell returned %i\n\n", retcode);
rawmode();
Hit_Return(); // let user see results
}
#endif
else if (cmd[0] == '=' && !cmd[1]) { // where is the address
if (b < 0) { // no addr given- use defaults
b = e = count_lines(text, dot);
}
status_line("%d", b);
} else if (strncmp(cmd, "delete", i) == 0) { // delete lines
if (b < 0) { // no addr given- use defaults
q = begin_line(dot); // assume .,. for the range
r = end_line(dot);
}
dot = yank_delete(q, r, 1, YANKDEL); // save, then delete lines
dot_skip_over_ws();
} else if (strncmp(cmd, "edit", i) == 0) { // Edit a file
// don't edit, if the current file has been modified
if (file_modified && !useforce) {
status_line_bold("No write since last change (:edit! overrides)");
goto ret;
}
if (args[0]) {
// the user supplied a file name
fn = args;
} else if (current_filename && current_filename[0]) {
// no user supplied name- use the current filename
// fn = current_filename; was set by default
} else {
// no user file name, no current name- punt
status_line_bold("No current filename");
goto ret;
}
if (init_text_buffer(fn) < 0)
goto ret;
#if ENABLE_FEATURE_VI_YANKMARK
if (Ureg >= 0 && Ureg < 28 && reg[Ureg] != 0) {
free(reg[Ureg]); // free orig line reg- for 'U'
reg[Ureg]= 0;
}
if (YDreg >= 0 && YDreg < 28 && reg[YDreg] != 0) {
free(reg[YDreg]); // free default yank/delete register
reg[YDreg]= 0;
}
#endif
// how many lines in text[]?
li = count_lines(text, end - 1);
status_line("\"%s\"%s"
IF_FEATURE_VI_READONLY("%s")
" %dL, %dC", current_filename,
(file_size(fn) < 0 ? " [New file]" : ""),
IF_FEATURE_VI_READONLY(
((readonly_mode) ? " [Readonly]" : ""),
)
li, ch);
} else if (strncmp(cmd, "file", i) == 0) { // what File is this
if (b != -1 || e != -1) {
status_line_bold("No address allowed on this command");
goto ret;
}
if (args[0]) {
// user wants a new filename
free(current_filename);
current_filename = xstrdup(args);
} else {
// user wants file status info
last_status_cksum = 0; // force status update
}
} else if (strncmp(cmd, "features", i) == 0) { // what features are available
// print out values of all features
go_bottom_and_clear_to_eol();
cookmode();
show_help();
rawmode();
Hit_Return();
} else if (strncmp(cmd, "list", i) == 0) { // literal print line
if (b < 0) { // no addr given- use defaults
q = begin_line(dot); // assume .,. for the range
r = end_line(dot);
}
go_bottom_and_clear_to_eol();
puts("\r");
for (; q <= r; q++) {
int c_is_no_print;
c = *q;
c_is_no_print = (c & 0x80) && !Isprint(c);
if (c_is_no_print) {
c = '.';
standout_start();
}
if (c == '\n') {
write1("$\r");
} else if (c < ' ' || c == 127) {
bb_putchar('^');
if (c == 127)
c = '?';
else
c += '@';
}
bb_putchar(c);
if (c_is_no_print)
standout_end();
}
Hit_Return();
} else if (strncmp(cmd, "quit", i) == 0 // quit
|| strncmp(cmd, "next", i) == 0 // edit next file
) {
int n;
if (useforce) {
// force end of argv list
if (*cmd == 'q') {
optind = save_argc;
}
editing = 0;
goto ret;
}
// don't exit if the file been modified
if (file_modified) {
status_line_bold("No write since last change (:%s! overrides)",
(*cmd == 'q' ? "quit" : "next"));
goto ret;
}
// are there other file to edit
n = save_argc - optind - 1;
if (*cmd == 'q' && n > 0) {
status_line_bold("%d more file(s) to edit", n);
goto ret;
}
if (*cmd == 'n' && n <= 0) {
status_line_bold("No more files to edit");
goto ret;
}
editing = 0;
} else if (strncmp(cmd, "read", i) == 0) { // read file into text[]
fn = args;
if (!fn[0]) {
status_line_bold("No filename given");
goto ret;
}
if (b < 0) { // no addr given- use defaults
q = begin_line(dot); // assume "dot"
}
// read after current line- unless user said ":0r foo"
if (b != 0)
q = next_line(q);
{ // dance around potentially-reallocated text[]
uintptr_t ofs = q - text;
ch = file_insert(fn, q, 0);
q = text + ofs;
}
if (ch < 0)
goto ret; // nothing was inserted
// how many lines in text[]?
li = count_lines(q, q + ch - 1);
status_line("\"%s\""
IF_FEATURE_VI_READONLY("%s")
" %dL, %dC", fn,
IF_FEATURE_VI_READONLY((readonly_mode ? " [Readonly]" : ""),)
li, ch);
if (ch > 0) {
// if the insert is before "dot" then we need to update
if (q <= dot)
dot += ch;
/*file_modified++; - done by file_insert */
}
} else if (strncmp(cmd, "rewind", i) == 0) { // rewind cmd line args
if (file_modified && !useforce) {
status_line_bold("No write since last change (:rewind! overrides)");
} else {
// reset the filenames to edit
optind = fn_start - 1;
editing = 0;
}
#if ENABLE_FEATURE_VI_SET
} else if (strncmp(cmd, "set", i) == 0) { // set or clear features
#if ENABLE_FEATURE_VI_SETOPTS
char *argp;
#endif
i = 0; // offset into args
// only blank is regarded as args delmiter. What about tab '\t' ?
if (!args[0] || strcasecmp(args, "all") == 0) {
// print out values of all options
#if ENABLE_FEATURE_VI_SETOPTS
status_line_bold(
"%sautoindent "
"%sflash "
"%signorecase "
"%sshowmatch "
"tabstop=%u",
autoindent ? "" : "no",
err_method ? "" : "no",
ignorecase ? "" : "no",
showmatch ? "" : "no",
tabstop
);
#endif
goto ret;
}
#if ENABLE_FEATURE_VI_SETOPTS
argp = args;
while (*argp) {
if (strncmp(argp, "no", 2) == 0)
i = 2; // ":set noautoindent"
setops(argp, "autoindent ", i, "ai", VI_AUTOINDENT);
setops(argp, "flash " , i, "fl", VI_ERR_METHOD);
setops(argp, "ignorecase ", i, "ic", VI_IGNORECASE);
setops(argp, "showmatch " , i, "sm", VI_SHOWMATCH );
if (strncmp(argp + i, "tabstop=", 8) == 0) {
int t = 0;
sscanf(argp + i+8, "%u", &t);
if (t > 0 && t <= MAX_TABSTOP)
tabstop = t;
}
argp = skip_non_whitespace(argp);
argp = skip_whitespace(argp);
}
#endif /* FEATURE_VI_SETOPTS */
#endif /* FEATURE_VI_SET */
#if ENABLE_FEATURE_VI_SEARCH
} else if (cmd[0] == 's') { // substitute a pattern with a replacement pattern
char *ls, *F, *R;
int gflag;
// F points to the "find" pattern
// R points to the "replace" pattern
// replace the cmd line delimiters "/" with NULLs
gflag = 0; // global replace flag
c = orig_buf[1]; // what is the delimiter
F = orig_buf + 2; // start of "find"
R = strchr(F, c); // middle delimiter
if (!R)
goto colon_s_fail;
*R++ = '\0'; // terminate "find"
buf1 = strchr(R, c);
if (!buf1)
goto colon_s_fail;
*buf1++ = '\0'; // terminate "replace"
if (*buf1 == 'g') { // :s/foo/bar/g
buf1++;
gflag++; // turn on gflag
}
q = begin_line(q);
if (b < 0) { // maybe :s/foo/bar/
q = begin_line(dot); // start with cur line
b = count_lines(text, q); // cur line number
}
if (e < 0)
e = b; // maybe :.s/foo/bar/
for (i = b; i <= e; i++) { // so, :20,23 s \0 find \0 replace \0
ls = q; // orig line start
vc4:
buf1 = char_search(q, F, FORWARD, LIMITED); // search cur line only for "find"
if (buf1) {
uintptr_t bias;
// we found the "find" pattern - delete it
text_hole_delete(buf1, buf1 + strlen(F) - 1);
// inset the "replace" patern
bias = string_insert(buf1, R); // insert the string
buf1 += bias;
ls += bias;
/*q += bias; - recalculated anyway */
// check for "global" :s/foo/bar/g
if (gflag == 1) {
if ((buf1 + strlen(R)) < end_line(ls)) {
q = buf1 + strlen(R);
goto vc4; // don't let q move past cur line
}
}
}
q = next_line(ls);
}
#endif /* FEATURE_VI_SEARCH */
} else if (strncmp(cmd, "version", i) == 0) { // show software version
status_line(BB_VER " " BB_BT);
} else if (strncmp(cmd, "write", i) == 0 // write text to file
|| strncmp(cmd, "wq", i) == 0
|| strncmp(cmd, "wn", i) == 0
|| (cmd[0] == 'x' && !cmd[1])
) {
// is there a file name to write to?
if (args[0]) {
fn = args;
}
#if ENABLE_FEATURE_VI_READONLY
if (readonly_mode && !useforce) {
status_line_bold("\"%s\" File is read only", fn);
goto ret;
}
#endif
// how many lines in text[]?
li = count_lines(q, r);
ch = r - q + 1;
// see if file exists- if not, its just a new file request
if (useforce) {
// if "fn" is not write-able, chmod u+w
// sprintf(syscmd, "chmod u+w %s", fn);
// system(syscmd);
forced = TRUE;
}
l = file_write(fn, q, r);
if (useforce && forced) {
// chmod u-w
// sprintf(syscmd, "chmod u-w %s", fn);
// system(syscmd);
forced = FALSE;
}
if (l < 0) {
if (l == -1)
status_line_bold("\"%s\" %s", fn, strerror(errno));
} else {
status_line("\"%s\" %dL, %dC", fn, li, l);
if (q == text && r == end - 1 && l == ch) {
file_modified = 0;
last_file_modified = -1;
}
if ((cmd[0] == 'x' || cmd[1] == 'q' || cmd[1] == 'n'
|| cmd[0] == 'X' || cmd[1] == 'Q' || cmd[1] == 'N'
)
&& l == ch
) {
editing = 0;
}
}
#if ENABLE_FEATURE_VI_YANKMARK
} else if (strncmp(cmd, "yank", i) == 0) { // yank lines
if (b < 0) { // no addr given- use defaults
q = begin_line(dot); // assume .,. for the range
r = end_line(dot);
}
text_yank(q, r, YDreg);
li = count_lines(q, r);
status_line("Yank %d lines (%d chars) into [%c]",
li, strlen(reg[YDreg]), what_reg());
#endif
} else {
// cmd unknown
not_implemented(cmd);
}
ret:
dot = bound_dot(dot); // make sure "dot" is valid
return;
#if ENABLE_FEATURE_VI_SEARCH
colon_s_fail:
status_line(":s expression missing delimiters");
#endif
}
#endif /* FEATURE_VI_COLON */
static void Hit_Return(void)
{
int c;
standout_start();
write1("[Hit return to continue]");
standout_end();
while ((c = get_one_char()) != '\n' && c != '\r')
continue;
redraw(TRUE); // force redraw all
}
static int next_tabstop(int col)
{
return col + ((tabstop - 1) - (col % tabstop));
}
//----- Synchronize the cursor to Dot --------------------------
static NOINLINE void sync_cursor(char *d, int *row, int *col)
{
char *beg_cur; // begin and end of "d" line
char *tp;
int cnt, ro, co;
beg_cur = begin_line(d); // first char of cur line
if (beg_cur < screenbegin) {
// "d" is before top line on screen
// how many lines do we have to move
cnt = count_lines(beg_cur, screenbegin);
sc1:
screenbegin = beg_cur;
if (cnt > (rows - 1) / 2) {
// we moved too many lines. put "dot" in middle of screen
for (cnt = 0; cnt < (rows - 1) / 2; cnt++) {
screenbegin = prev_line(screenbegin);
}
}
} else {
char *end_scr; // begin and end of screen
end_scr = end_screen(); // last char of screen
if (beg_cur > end_scr) {
// "d" is after bottom line on screen
// how many lines do we have to move
cnt = count_lines(end_scr, beg_cur);
if (cnt > (rows - 1) / 2)
goto sc1; // too many lines
for (ro = 0; ro < cnt - 1; ro++) {
// move screen begin the same amount
screenbegin = next_line(screenbegin);
// now, move the end of screen
end_scr = next_line(end_scr);
end_scr = end_line(end_scr);
}
}
}
// "d" is on screen- find out which row
tp = screenbegin;
for (ro = 0; ro < rows - 1; ro++) { // drive "ro" to correct row
if (tp == beg_cur)
break;
tp = next_line(tp);
}
// find out what col "d" is on
co = 0;
while (tp < d) { // drive "co" to correct column
if (*tp == '\n') //vda || *tp == '\0')
break;
if (*tp == '\t') {
// handle tabs like real vi
if (d == tp && cmd_mode) {
break;
}
co = next_tabstop(co);
} else if ((unsigned char)*tp < ' ' || *tp == 0x7f) {
co++; // display as ^X, use 2 columns
}
co++;
tp++;
}
// "co" is the column where "dot" is.
// The screen has "columns" columns.
// The currently displayed columns are 0+offset -- columns+ofset
// |-------------------------------------------------------------|
// ^ ^ ^
// offset | |------- columns ----------------|
//
// If "co" is already in this range then we do not have to adjust offset
// but, we do have to subtract the "offset" bias from "co".
// If "co" is outside this range then we have to change "offset".
// If the first char of a line is a tab the cursor will try to stay
// in column 7, but we have to set offset to 0.
if (co < 0 + offset) {
offset = co;
}
if (co >= columns + offset) {
offset = co - columns + 1;
}
// if the first char of the line is a tab, and "dot" is sitting on it
// force offset to 0.
if (d == beg_cur && *d == '\t') {
offset = 0;
}
co -= offset;
*row = ro;
*col = co;
}
//----- Text Movement Routines ---------------------------------
static char *begin_line(char *p) // return pointer to first char cur line
{
if (p > text) {
p = memrchr(text, '\n', p - text);
if (!p)
return text;
return p + 1;
}
return p;
}
static char *end_line(char *p) // return pointer to NL of cur line
{
if (p < end - 1) {
p = memchr(p, '\n', end - p - 1);
if (!p)
return end - 1;
}
return p;
}
static char *dollar_line(char *p) // return pointer to just before NL line
{
p = end_line(p);
// Try to stay off of the Newline
if (*p == '\n' && (p - begin_line(p)) > 0)
p--;
return p;
}
static char *prev_line(char *p) // return pointer first char prev line
{
p = begin_line(p); // goto begining of cur line
if (p > text && p[-1] == '\n')
p--; // step to prev line
p = begin_line(p); // goto begining of prev line
return p;
}
static char *next_line(char *p) // return pointer first char next line
{
p = end_line(p);
if (p < end - 1 && *p == '\n')
p++; // step to next line
return p;
}
//----- Text Information Routines ------------------------------
static char *end_screen(void)
{
char *q;
int cnt;
// find new bottom line
q = screenbegin;
for (cnt = 0; cnt < rows - 2; cnt++)
q = next_line(q);
q = end_line(q);
return q;
}
// count line from start to stop
static int count_lines(char *start, char *stop)
{
char *q;
int cnt;
if (stop < start) { // start and stop are backwards- reverse them
q = start;
start = stop;
stop = q;
}
cnt = 0;
stop = end_line(stop);
while (start <= stop && start <= end - 1) {
start = end_line(start);
if (*start == '\n')
cnt++;
start++;
}
return cnt;
}
static char *find_line(int li) // find begining of line #li
{
char *q;
for (q = text; li > 1; li--) {
q = next_line(q);
}
return q;
}
//----- Dot Movement Routines ----------------------------------
static void dot_left(void)
{
if (dot > text && dot[-1] != '\n')
dot--;
}
static void dot_right(void)
{
if (dot < end - 1 && *dot != '\n')
dot++;
}
static void dot_begin(void)
{
dot = begin_line(dot); // return pointer to first char cur line
}
static void dot_end(void)
{
dot = end_line(dot); // return pointer to last char cur line
}
static char *move_to_col(char *p, int l)
{
int co;
p = begin_line(p);
co = 0;
while (co < l && p < end) {
if (*p == '\n') //vda || *p == '\0')
break;
if (*p == '\t') {
co = next_tabstop(co);
} else if (*p < ' ' || *p == 127) {
co++; // display as ^X, use 2 columns
}
co++;
p++;
}
return p;
}
static void dot_next(void)
{
dot = next_line(dot);
}
static void dot_prev(void)
{
dot = prev_line(dot);
}
static void dot_scroll(int cnt, int dir)
{
char *q;
for (; cnt > 0; cnt--) {
if (dir < 0) {
// scroll Backwards
// ctrl-Y scroll up one line
screenbegin = prev_line(screenbegin);
} else {
// scroll Forwards
// ctrl-E scroll down one line
screenbegin = next_line(screenbegin);
}
}
// make sure "dot" stays on the screen so we dont scroll off
if (dot < screenbegin)
dot = screenbegin;
q = end_screen(); // find new bottom line
if (dot > q)
dot = begin_line(q); // is dot is below bottom line?
dot_skip_over_ws();
}
static void dot_skip_over_ws(void)
{
// skip WS
while (isspace(*dot) && *dot != '\n' && dot < end - 1)
dot++;
}
static void dot_delete(void) // delete the char at 'dot'
{
text_hole_delete(dot, dot);
}
static char *bound_dot(char *p) // make sure text[0] <= P < "end"
{
if (p >= end && end > text) {
p = end - 1;
indicate_error('1');
}
if (p < text) {
p = text;
indicate_error('2');
}
return p;
}
//----- Helper Utility Routines --------------------------------
//----------------------------------------------------------------
//----- Char Routines --------------------------------------------
/* Chars that are part of a word-
* 0123456789_ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
* Chars that are Not part of a word (stoppers)
* !"#$%&'()*+,-./:;<=>?@[\]^`{|}~
* Chars that are WhiteSpace
* TAB NEWLINE VT FF RETURN SPACE
* DO NOT COUNT NEWLINE AS WHITESPACE
*/
static char *new_screen(int ro, int co)
{
int li;
free(screen);
screensize = ro * co + 8;
screen = xmalloc(screensize);
// initialize the new screen. assume this will be a empty file.
screen_erase();
// non-existent text[] lines start with a tilde (~).
for (li = 1; li < ro - 1; li++) {
screen[(li * co) + 0] = '~';
}
return screen;
}
#if ENABLE_FEATURE_VI_SEARCH
static int mycmp(const char *s1, const char *s2, int len)
{
if (ENABLE_FEATURE_VI_SETOPTS && ignorecase) {
return strncasecmp(s1, s2, len);
}
return strncmp(s1, s2, len);
}
// search for pattern starting at p
static char *char_search(char *p, const char *pat, int dir, int range)
{
#ifndef REGEX_SEARCH
char *start, *stop;
int len;
len = strlen(pat);
if (dir == FORWARD) {
stop = end - 1; // assume range is p - end-1
if (range == LIMITED)
stop = next_line(p); // range is to next line
for (start = p; start < stop; start++) {
if (mycmp(start, pat, len) == 0) {
return start;
}
}
} else if (dir == BACK) {
stop = text; // assume range is text - p
if (range == LIMITED)
stop = prev_line(p); // range is to prev line
for (start = p - len; start >= stop; start--) {
if (mycmp(start, pat, len) == 0) {
return start;
}
}
}
// pattern not found
return NULL;
#else /* REGEX_SEARCH */
char *q;
struct re_pattern_buffer preg;
int i;
int size, range;
re_syntax_options = RE_SYNTAX_POSIX_EXTENDED;
preg.translate = 0;
preg.fastmap = 0;
preg.buffer = 0;
preg.allocated = 0;
// assume a LIMITED forward search
q = next_line(p);
q = end_line(q);
q = end - 1;
if (dir == BACK) {
q = prev_line(p);
q = text;
}
// count the number of chars to search over, forward or backward
size = q - p;
if (size < 0)
size = p - q;
// RANGE could be negative if we are searching backwards
range = q - p;
q = re_compile_pattern(pat, strlen(pat), &preg);
if (q != 0) {
// The pattern was not compiled
status_line_bold("bad search pattern: \"%s\": %s", pat, q);
i = 0; // return p if pattern not compiled
goto cs1;
}
q = p;
if (range < 0) {
q = p - size;
if (q < text)
q = text;
}
// search for the compiled pattern, preg, in p[]
// range < 0- search backward
// range > 0- search forward
// 0 < start < size
// re_search() < 0 not found or error
// re_search() > 0 index of found pattern
// struct pattern char int int int struct reg
// re_search (*pattern_buffer, *string, size, start, range, *regs)
i = re_search(&preg, q, size, 0, range, 0);
if (i == -1) {
p = 0;
i = 0; // return NULL if pattern not found
}
cs1:
if (dir == FORWARD) {
p = p + i;
} else {
p = p - i;
}
return p;
#endif /* REGEX_SEARCH */
}
#endif /* FEATURE_VI_SEARCH */
static char *char_insert(char *p, char c) // insert the char c at 'p'
{
if (c == 22) { // Is this an ctrl-V?
p += stupid_insert(p, '^'); // use ^ to indicate literal next
refresh(FALSE); // show the ^
c = get_one_char();
*p = c;
p++;
file_modified++;
} else if (c == 27) { // Is this an ESC?
cmd_mode = 0;
cmdcnt = 0;
end_cmd_q(); // stop adding to q
last_status_cksum = 0; // force status update
if ((p[-1] != '\n') && (dot > text)) {
p--;
}
} else if (c == erase_char || c == 8 || c == 127) { // Is this a BS
// 123456789
if ((p[-1] != '\n') && (dot>text)) {
p--;
p = text_hole_delete(p, p); // shrink buffer 1 char
}
} else {
// insert a char into text[]
char *sp; // "save p"
if (c == 13)
c = '\n'; // translate \r to \n
sp = p; // remember addr of insert
p += 1 + stupid_insert(p, c); // insert the char
#if ENABLE_FEATURE_VI_SETOPTS
if (showmatch && strchr(")]}", *sp) != NULL) {
showmatching(sp);
}
if (autoindent && c == '\n') { // auto indent the new line
char *q;
size_t len;
q = prev_line(p); // use prev line as template
len = strspn(q, " \t"); // space or tab
if (len) {
uintptr_t bias;
bias = text_hole_make(p, len);
p += bias;
q += bias;
memcpy(p, q, len);
p += len;
}
}
#endif
}
return p;
}
// might reallocate text[]! use p += stupid_insert(p, ...),
// and be careful to not use pointers into potentially freed text[]!
static uintptr_t stupid_insert(char *p, char c) // stupidly insert the char c at 'p'
{
uintptr_t bias;
bias = text_hole_make(p, 1);
p += bias;
*p = c;
//file_modified++; - done by text_hole_make()
return bias;
}
static int find_range(char **start, char **stop, char c)
{
char *save_dot, *p, *q, *t;
int cnt, multiline = 0;
save_dot = dot;
p = q = dot;
if (strchr("cdy><", c)) {
// these cmds operate on whole lines
p = q = begin_line(p);
for (cnt = 1; cnt < cmdcnt; cnt++) {
q = next_line(q);
}
q = end_line(q);
} else if (strchr("^%$0bBeEfth\b\177", c)) {
// These cmds operate on char positions
do_cmd(c); // execute movement cmd
q = dot;
} else if (strchr("wW", c)) {
do_cmd(c); // execute movement cmd
// if we are at the next word's first char
// step back one char
// but check the possibilities when it is true
if (dot > text && ((isspace(dot[-1]) && !isspace(dot[0]))
|| (ispunct(dot[-1]) && !ispunct(dot[0]))
|| (isalnum(dot[-1]) && !isalnum(dot[0]))))
dot--; // move back off of next word
if (dot > text && *dot == '\n')
dot--; // stay off NL
q = dot;
} else if (strchr("H-k{", c)) {
// these operate on multi-lines backwards
q = end_line(dot); // find NL
do_cmd(c); // execute movement cmd
dot_begin();
p = dot;
} else if (strchr("L+j}\r\n", c)) {
// these operate on multi-lines forwards
p = begin_line(dot);
do_cmd(c); // execute movement cmd
dot_end(); // find NL
q = dot;
} else {
// nothing -- this causes any other values of c to
// represent the one-character range under the
// cursor. this is correct for ' ' and 'l', but
// perhaps no others.
//
}
if (q < p) {
t = q;
q = p;
p = t;
}
// backward char movements don't include start position
if (q > p && strchr("^0bBh\b\177", c)) q--;
multiline = 0;
for (t = p; t <= q; t++) {
if (*t == '\n') {
multiline = 1;
break;
}
}
*start = p;
*stop = q;
dot = save_dot;
return multiline;
}
static int st_test(char *p, int type, int dir, char *tested)
{
char c, c0, ci;
int test, inc;
inc = dir;
c = c0 = p[0];
ci = p[inc];
test = 0;
if (type == S_BEFORE_WS) {
c = ci;
test = (!isspace(c) || c == '\n');
}
if (type == S_TO_WS) {
c = c0;
test = (!isspace(c) || c == '\n');
}
if (type == S_OVER_WS) {
c = c0;
test = isspace(c);
}
if (type == S_END_PUNCT) {
c = ci;
test = ispunct(c);
}
if (type == S_END_ALNUM) {
c = ci;
test = (isalnum(c) || c == '_');
}
*tested = c;
return test;
}
static char *skip_thing(char *p, int linecnt, int dir, int type)
{
char c;
while (st_test(p, type, dir, &c)) {
// make sure we limit search to correct number of lines
if (c == '\n' && --linecnt < 1)
break;
if (dir >= 0 && p >= end - 1)
break;
if (dir < 0 && p <= text)
break;
p += dir; // move to next char
}
return p;
}
// find matching char of pair () [] {}
static char *find_pair(char *p, const char c)
{
char match, *q;
int dir, level;
match = ')';
level = 1;
dir = 1; // assume forward
switch (c) {
case '(': match = ')'; break;
case '[': match = ']'; break;
case '{': match = '}'; break;
case ')': match = '('; dir = -1; break;
case ']': match = '['; dir = -1; break;
case '}': match = '{'; dir = -1; break;
}
for (q = p + dir; text <= q && q < end; q += dir) {
// look for match, count levels of pairs (( ))
if (*q == c)
level++; // increase pair levels
if (*q == match)
level--; // reduce pair level
if (level == 0)
break; // found matching pair
}
if (level != 0)
q = NULL; // indicate no match
return q;
}
#if ENABLE_FEATURE_VI_SETOPTS
// show the matching char of a pair, () [] {}
static void showmatching(char *p)
{
char *q, *save_dot;
// we found half of a pair
q = find_pair(p, *p); // get loc of matching char
if (q == NULL) {
indicate_error('3'); // no matching char
} else {
// "q" now points to matching pair
save_dot = dot; // remember where we are
dot = q; // go to new loc
refresh(FALSE); // let the user see it
mysleep(40); // give user some time
dot = save_dot; // go back to old loc
refresh(FALSE);
}
}
#endif /* FEATURE_VI_SETOPTS */
// open a hole in text[]
// might reallocate text[]! use p += text_hole_make(p, ...),
// and be careful to not use pointers into potentially freed text[]!
static uintptr_t text_hole_make(char *p, int size) // at "p", make a 'size' byte hole
{
uintptr_t bias = 0;
if (size <= 0)
return bias;
end += size; // adjust the new END
if (end >= (text + text_size)) {
char *new_text;
text_size += end - (text + text_size) + 10240;
new_text = xrealloc(text, text_size);
bias = (new_text - text);
screenbegin += bias;
dot += bias;
end += bias;
p += bias;
text = new_text;
}
memmove(p + size, p, end - size - p);
memset(p, ' ', size); // clear new hole
file_modified++;
return bias;
}
// close a hole in text[]
static char *text_hole_delete(char *p, char *q) // delete "p" through "q", inclusive
{
char *src, *dest;
int cnt, hole_size;
// move forwards, from beginning
// assume p <= q
src = q + 1;
dest = p;
if (q < p) { // they are backward- swap them
src = p + 1;
dest = q;
}
hole_size = q - p + 1;
cnt = end - src;
if (src < text || src > end)
goto thd0;
if (dest < text || dest >= end)
goto thd0;
if (src >= end)
goto thd_atend; // just delete the end of the buffer
memmove(dest, src, cnt);
thd_atend:
end = end - hole_size; // adjust the new END
if (dest >= end)
dest = end - 1; // make sure dest in below end-1
if (end <= text)
dest = end = text; // keep pointers valid
file_modified++;
thd0:
return dest;
}
// copy text into register, then delete text.
// if dist <= 0, do not include, or go past, a NewLine
//
static char *yank_delete(char *start, char *stop, int dist, int yf)
{
char *p;
// make sure start <= stop
if (start > stop) {
// they are backwards, reverse them
p = start;
start = stop;
stop = p;
}
if (dist <= 0) {
// we cannot cross NL boundaries
p = start;
if (*p == '\n')
return p;
// dont go past a NewLine
for (; p + 1 <= stop; p++) {
if (p[1] == '\n') {
stop = p; // "stop" just before NewLine
break;
}
}
}
p = start;
#if ENABLE_FEATURE_VI_YANKMARK
text_yank(start, stop, YDreg);
#endif
if (yf == YANKDEL) {
p = text_hole_delete(start, stop);
} // delete lines
return p;
}
static void show_help(void)
{
puts("These features are available:"
#if ENABLE_FEATURE_VI_SEARCH
"\n\tPattern searches with / and ?"
#endif
#if ENABLE_FEATURE_VI_DOT_CMD
"\n\tLast command repeat with \'.\'"
#endif
#if ENABLE_FEATURE_VI_YANKMARK
"\n\tLine marking with 'x"
"\n\tNamed buffers with \"x"
#endif
#if ENABLE_FEATURE_VI_READONLY
"\n\tReadonly if vi is called as \"view\""
"\n\tReadonly with -R command line arg"
#endif
#if ENABLE_FEATURE_VI_SET
"\n\tSome colon mode commands with \':\'"
#endif
#if ENABLE_FEATURE_VI_SETOPTS
"\n\tSettable options with \":set\""
#endif
#if ENABLE_FEATURE_VI_USE_SIGNALS
"\n\tSignal catching- ^C"
"\n\tJob suspend and resume with ^Z"
#endif
#if ENABLE_FEATURE_VI_WIN_RESIZE
"\n\tAdapt to window re-sizes"
#endif
);
}
#if ENABLE_FEATURE_VI_DOT_CMD
static void start_new_cmd_q(char c)
{
// get buffer for new cmd
// if there is a current cmd count put it in the buffer first
if (cmdcnt > 0) {
lmc_len = sprintf(last_modifying_cmd, "%d%c", cmdcnt, c);
} else { // just save char c onto queue
last_modifying_cmd[0] = c;
lmc_len = 1;
}
adding2q = 1;
}
static void end_cmd_q(void)
{
#if ENABLE_FEATURE_VI_YANKMARK
YDreg = 26; // go back to default Yank/Delete reg
#endif
adding2q = 0;
}
#endif /* FEATURE_VI_DOT_CMD */
#if ENABLE_FEATURE_VI_YANKMARK \
|| (ENABLE_FEATURE_VI_COLON && ENABLE_FEATURE_VI_SEARCH) \
|| ENABLE_FEATURE_VI_CRASHME
// might reallocate text[]! use p += string_insert(p, ...),
// and be careful to not use pointers into potentially freed text[]!
static uintptr_t string_insert(char *p, const char *s) // insert the string at 'p'
{
uintptr_t bias;
int i;
i = strlen(s);
bias = text_hole_make(p, i);
p += bias;
memcpy(p, s, i);
#if ENABLE_FEATURE_VI_YANKMARK
{
int cnt;
for (cnt = 0; *s != '\0'; s++) {
if (*s == '\n')
cnt++;
}
status_line("Put %d lines (%d chars) from [%c]", cnt, i, what_reg());
}
#endif
return bias;
}
#endif
#if ENABLE_FEATURE_VI_YANKMARK
static char *text_yank(char *p, char *q, int dest) // copy text into a register
{
int cnt = q - p;
if (cnt < 0) { // they are backwards- reverse them
p = q;
cnt = -cnt;
}
free(reg[dest]); // if already a yank register, free it
reg[dest] = xstrndup(p, cnt + 1);
return p;
}
static char what_reg(void)
{
char c;
c = 'D'; // default to D-reg
if (0 <= YDreg && YDreg <= 25)
c = 'a' + (char) YDreg;
if (YDreg == 26)
c = 'D';
if (YDreg == 27)
c = 'U';
return c;
}
static void check_context(char cmd)
{
// A context is defined to be "modifying text"
// Any modifying command establishes a new context.
if (dot < context_start || dot > context_end) {
if (strchr(modifying_cmds, cmd) != NULL) {
// we are trying to modify text[]- make this the current context
mark[27] = mark[26]; // move cur to prev
mark[26] = dot; // move local to cur
context_start = prev_line(prev_line(dot));
context_end = next_line(next_line(dot));
//loiter= start_loiter= now;
}
}
}
static char *swap_context(char *p) // goto new context for '' command make this the current context
{
char *tmp;
// the current context is in mark[26]
// the previous context is in mark[27]
// only swap context if other context is valid
if (text <= mark[27] && mark[27] <= end - 1) {
tmp = mark[27];
mark[27] = mark[26];
mark[26] = tmp;
p = mark[26]; // where we are going- previous context
context_start = prev_line(prev_line(prev_line(p)));
context_end = next_line(next_line(next_line(p)));
}
return p;
}
#endif /* FEATURE_VI_YANKMARK */
//----- Set terminal attributes --------------------------------
static void rawmode(void)
{
tcgetattr(0, &term_orig);
term_vi = term_orig;
term_vi.c_lflag &= (~ICANON & ~ECHO); // leave ISIG ON- allow intr's
term_vi.c_iflag &= (~IXON & ~ICRNL);
term_vi.c_oflag &= (~ONLCR);
term_vi.c_cc[VMIN] = 1;
term_vi.c_cc[VTIME] = 0;
erase_char = term_vi.c_cc[VERASE];
tcsetattr_stdin_TCSANOW(&term_vi);
}
static void cookmode(void)
{
fflush_all();
tcsetattr_stdin_TCSANOW(&term_orig);
}
#if ENABLE_FEATURE_VI_USE_SIGNALS
//----- Come here when we get a window resize signal ---------
static void winch_sig(int sig UNUSED_PARAM)
{
int save_errno = errno;
// FIXME: do it in main loop!!!
signal(SIGWINCH, winch_sig);
query_screen_dimensions();
new_screen(rows, columns); // get memory for virtual screen
redraw(TRUE); // re-draw the screen
errno = save_errno;
}
//----- Come here when we get a continue signal -------------------
static void cont_sig(int sig UNUSED_PARAM)
{
int save_errno = errno;
rawmode(); // terminal to "raw"
last_status_cksum = 0; // force status update
redraw(TRUE); // re-draw the screen
signal(SIGTSTP, suspend_sig);
signal(SIGCONT, SIG_DFL);
//kill(my_pid, SIGCONT); // huh? why? we are already "continued"...
errno = save_errno;
}
//----- Come here when we get a Suspend signal -------------------
static void suspend_sig(int sig UNUSED_PARAM)
{
int save_errno = errno;
go_bottom_and_clear_to_eol();
cookmode(); // terminal to "cooked"
signal(SIGCONT, cont_sig);
signal(SIGTSTP, SIG_DFL);
kill(my_pid, SIGTSTP);
errno = save_errno;
}
//----- Come here when we get a signal ---------------------------
static void catch_sig(int sig)
{
signal(SIGINT, catch_sig);
siglongjmp(restart, sig);
}
#endif /* FEATURE_VI_USE_SIGNALS */
static int mysleep(int hund) // sleep for 'hund' 1/100 seconds or stdin ready
{
struct pollfd pfd[1];
pfd[0].fd = STDIN_FILENO;
pfd[0].events = POLLIN;
return safe_poll(pfd, 1, hund*10) > 0;
}
//----- IO Routines --------------------------------------------
static int readit(void) // read (maybe cursor) key from stdin
{
int c;
fflush_all();
c = read_key(STDIN_FILENO, readbuffer, /*timeout off:*/ -2);
if (c == -1) { // EOF/error
go_bottom_and_clear_to_eol();
cookmode(); // terminal to "cooked"
bb_error_msg_and_die("can't read user input");
}
return c;
}
//----- IO Routines --------------------------------------------
static int get_one_char(void)
{
int c;
#if ENABLE_FEATURE_VI_DOT_CMD
if (!adding2q) {
// we are not adding to the q.
// but, we may be reading from a q
if (ioq == 0) {
// there is no current q, read from STDIN
c = readit(); // get the users input
} else {
// there is a queue to get chars from first
// careful with correct sign expansion!
c = (unsigned char)*ioq++;
if (c == '\0') {
// the end of the q, read from STDIN
free(ioq_start);
ioq_start = ioq = 0;
c = readit(); // get the users input
}
}
} else {
// adding STDIN chars to q
c = readit(); // get the users input
if (lmc_len >= MAX_INPUT_LEN - 1) {
status_line_bold("last_modifying_cmd overrun");
} else {
// add new char to q
last_modifying_cmd[lmc_len++] = c;
}
}
#else
c = readit(); // get the users input
#endif /* FEATURE_VI_DOT_CMD */
return c;
}
// Get input line (uses "status line" area)
static char *get_input_line(const char *prompt)
{
// char [MAX_INPUT_LEN]
#define buf get_input_line__buf
int c;
int i;
strcpy(buf, prompt);
last_status_cksum = 0; // force status update
go_bottom_and_clear_to_eol();
write1(prompt); // write out the :, /, or ? prompt
i = strlen(buf);
while (i < MAX_INPUT_LEN) {
c = get_one_char();
if (c == '\n' || c == '\r' || c == 27)
break; // this is end of input
if (c == erase_char || c == 8 || c == 127) {
// user wants to erase prev char
buf[--i] = '\0';
write1("\b \b"); // erase char on screen
if (i <= 0) // user backs up before b-o-l, exit
break;
} else if (c > 0 && c < 256) { // exclude Unicode
// (TODO: need to handle Unicode)
buf[i] = c;
buf[++i] = '\0';
bb_putchar(c);
}
}
refresh(FALSE);
return buf;
#undef buf
}
static int file_size(const char *fn) // what is the byte size of "fn"
{
struct stat st_buf;
int cnt;
cnt = -1;
if (fn && stat(fn, &st_buf) == 0) // see if file exists
cnt = (int) st_buf.st_size;
return cnt;
}
// might reallocate text[]!
static int file_insert(const char *fn, char *p, int update_ro_status)
{
int cnt = -1;
int fd, size;
struct stat statbuf;
/* Validate file */
if (stat(fn, &statbuf) < 0) {
status_line_bold("\"%s\" %s", fn, strerror(errno));
goto fi0;
}
if (!S_ISREG(statbuf.st_mode)) {
// This is not a regular file
status_line_bold("\"%s\" Not a regular file", fn);
goto fi0;
}
if (p < text || p > end) {
status_line_bold("Trying to insert file outside of memory");
goto fi0;
}
// read file to buffer
fd = open(fn, O_RDONLY);
if (fd < 0) {
status_line_bold("\"%s\" %s", fn, strerror(errno));
goto fi0;
}
size = statbuf.st_size;
p += text_hole_make(p, size);
cnt = safe_read(fd, p, size);
if (cnt < 0) {
status_line_bold("\"%s\" %s", fn, strerror(errno));
p = text_hole_delete(p, p + size - 1); // un-do buffer insert
} else if (cnt < size) {
// There was a partial read, shrink unused space text[]
p = text_hole_delete(p + cnt, p + (size - cnt) - 1); // un-do buffer insert
status_line_bold("can't read all of file \"%s\"", fn);
}
if (cnt >= size)
file_modified++;
close(fd);
fi0:
#if ENABLE_FEATURE_VI_READONLY
if (update_ro_status
&& ((access(fn, W_OK) < 0) ||
/* root will always have access()
* so we check fileperms too */
!(statbuf.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH))
)
) {
SET_READONLY_FILE(readonly_mode);
}
#endif
return cnt;
}
static int file_write(char *fn, char *first, char *last)
{
int fd, cnt, charcnt;
if (fn == 0) {
status_line_bold("No current filename");
return -2;
}
/* By popular request we do not open file with O_TRUNC,
* but instead ftruncate() it _after_ successful write.
* Might reduce amount of data lost on power fail etc.
*/
fd = open(fn, (O_WRONLY | O_CREAT), 0666);
if (fd < 0)
return -1;
cnt = last - first + 1;
charcnt = full_write(fd, first, cnt);
ftruncate(fd, charcnt);
if (charcnt == cnt) {
// good write
//file_modified = FALSE;
} else {
charcnt = 0;
}
close(fd);
return charcnt;
}
//----- Terminal Drawing ---------------------------------------
// The terminal is made up of 'rows' line of 'columns' columns.
// classically this would be 24 x 80.
// screen coordinates
// 0,0 ... 0,79
// 1,0 ... 1,79
// . ... .
// . ... .
// 22,0 ... 22,79
// 23,0 ... 23,79 <- status line
//----- Move the cursor to row x col (count from 0, not 1) -------
static void place_cursor(int row, int col, int optimize)
{
char cm1[sizeof(CMrc) + sizeof(int)*3 * 2];
#if ENABLE_FEATURE_VI_OPTIMIZE_CURSOR
enum {
SZ_UP = sizeof(CMup),
SZ_DN = sizeof(CMdown),
SEQ_SIZE = SZ_UP > SZ_DN ? SZ_UP : SZ_DN,
};
char cm2[SEQ_SIZE * 5 + 32]; // bigger than worst case size
#endif
char *cm;
if (row < 0) row = 0;
if (row >= rows) row = rows - 1;
if (col < 0) col = 0;
if (col >= columns) col = columns - 1;
//----- 1. Try the standard terminal ESC sequence
sprintf(cm1, CMrc, row + 1, col + 1);
cm = cm1;
#if ENABLE_FEATURE_VI_OPTIMIZE_CURSOR
if (optimize && col < 16) {
char *screenp;
int Rrow = last_row;
int diff = Rrow - row;
if (diff < -5 || diff > 5)
goto skip;
//----- find the minimum # of chars to move cursor -------------
//----- 2. Try moving with discreet chars (Newline, [back]space, ...)
cm2[0] = '\0';
// move to the correct row
while (row < Rrow) {
// the cursor has to move up
strcat(cm2, CMup);
Rrow--;
}
while (row > Rrow) {
// the cursor has to move down
strcat(cm2, CMdown);
Rrow++;
}
// now move to the correct column
strcat(cm2, "\r"); // start at col 0
// just send out orignal source char to get to correct place
screenp = &screen[row * columns]; // start of screen line
strncat(cm2, screenp, col);
// pick the shortest cursor motion to send out
if (strlen(cm2) < strlen(cm)) {
cm = cm2;
}
skip: ;
}
last_row = row;
#endif /* FEATURE_VI_OPTIMIZE_CURSOR */
write1(cm);
}
//----- Erase from cursor to end of line -----------------------
static void clear_to_eol(void)
{
write1(Ceol); // Erase from cursor to end of line
}
static void go_bottom_and_clear_to_eol(void)
{
place_cursor(rows - 1, 0, FALSE); // go to bottom of screen
clear_to_eol(); // erase to end of line
}
//----- Erase from cursor to end of screen -----------------------
static void clear_to_eos(void)
{
write1(Ceos); // Erase from cursor to end of screen
}
//----- Start standout mode ------------------------------------
static void standout_start(void) // send "start reverse video" sequence
{
write1(SOs); // Start reverse video mode
}
//----- End standout mode --------------------------------------
static void standout_end(void) // send "end reverse video" sequence
{
write1(SOn); // End reverse video mode
}
//----- Flash the screen --------------------------------------
static void flash(int h)
{
standout_start(); // send "start reverse video" sequence
redraw(TRUE);
mysleep(h);
standout_end(); // send "end reverse video" sequence
redraw(TRUE);
}
static void Indicate_Error(void)
{
#if ENABLE_FEATURE_VI_CRASHME
if (crashme > 0)
return; // generate a random command
#endif
if (!err_method) {
write1(bell); // send out a bell character
} else {
flash(10);
}
}
//----- Screen[] Routines --------------------------------------
//----- Erase the Screen[] memory ------------------------------
static void screen_erase(void)
{
memset(screen, ' ', screensize); // clear new screen
}
static int bufsum(char *buf, int count)
{
int sum = 0;
char *e = buf + count;
while (buf < e)
sum += (unsigned char) *buf++;
return sum;
}
//----- Draw the status line at bottom of the screen -------------
static void show_status_line(void)
{
int cnt = 0, cksum = 0;
// either we already have an error or status message, or we
// create one.
if (!have_status_msg) {
cnt = format_edit_status();
cksum = bufsum(status_buffer, cnt);
}
if (have_status_msg || ((cnt > 0 && last_status_cksum != cksum))) {
last_status_cksum = cksum; // remember if we have seen this line
go_bottom_and_clear_to_eol();
write1(status_buffer);
if (have_status_msg) {
if (((int)strlen(status_buffer) - (have_status_msg - 1)) >
(columns - 1) ) {
have_status_msg = 0;
Hit_Return();
}
have_status_msg = 0;
}
place_cursor(crow, ccol, FALSE); // put cursor back in correct place
}
fflush_all();
}
//----- format the status buffer, the bottom line of screen ------
// format status buffer, with STANDOUT mode
static void status_line_bold(const char *format, ...)
{
va_list args;
va_start(args, format);
strcpy(status_buffer, SOs); // Terminal standout mode on
vsprintf(status_buffer + sizeof(SOs)-1, format, args);
strcat(status_buffer, SOn); // Terminal standout mode off
va_end(args);
have_status_msg = 1 + sizeof(SOs) + sizeof(SOn) - 2;
}
// format status buffer
static void status_line(const char *format, ...)
{
va_list args;
va_start(args, format);
vsprintf(status_buffer, format, args);
va_end(args);
have_status_msg = 1;
}
// copy s to buf, convert unprintable
static void print_literal(char *buf, const char *s)
{
char *d;
unsigned char c;
buf[0] = '\0';
if (!s[0])
s = "(NULL)";
d = buf;
for (; *s; s++) {
int c_is_no_print;
c = *s;
c_is_no_print = (c & 0x80) && !Isprint(c);
if (c_is_no_print) {
strcpy(d, SOn);
d += sizeof(SOn)-1;
c = '.';
}
if (c < ' ' || c == 0x7f) {
*d++ = '^';
c |= '@'; /* 0x40 */
if (c == 0x7f)
c = '?';
}
*d++ = c;
*d = '\0';
if (c_is_no_print) {
strcpy(d, SOs);
d += sizeof(SOs)-1;
}
if (*s == '\n') {
*d++ = '$';
*d = '\0';
}
if (d - buf > MAX_INPUT_LEN - 10) // paranoia
break;
}
}
static void not_implemented(const char *s)
{
char buf[MAX_INPUT_LEN];
print_literal(buf, s);
status_line_bold("\'%s\' is not implemented", buf);
}
// show file status on status line
static int format_edit_status(void)
{
static const char cmd_mode_indicator[] ALIGN1 = "-IR-";
#define tot format_edit_status__tot
int cur, percent, ret, trunc_at;
// file_modified is now a counter rather than a flag. this
// helps reduce the amount of line counting we need to do.
// (this will cause a mis-reporting of modified status
// once every MAXINT editing operations.)
// it would be nice to do a similar optimization here -- if
// we haven't done a motion that could have changed which line
// we're on, then we shouldn't have to do this count_lines()
cur = count_lines(text, dot);
// reduce counting -- the total lines can't have
// changed if we haven't done any edits.
if (file_modified != last_file_modified) {
tot = cur + count_lines(dot, end - 1) - 1;
last_file_modified = file_modified;
}