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main.c
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/* main.c: This file contains the main control and user-interface routines
for the ed line editor. */
/*-
* Copyright (c) 1993 Andrew Moore, Talke Studio.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
#if 0
static const char copyright[] =
"@(#) Copyright (c) 1993 Andrew Moore, Talke Studio. \n\
All rights reserved.\n";
#endif
#endif /* not lint */
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
/*
* CREDITS
*
* This program is based on the editor algorithm described in
* Brian W. Kernighan and P. J. Plauger's book "Software Tools
* in Pascal," Addison-Wesley, 1981.
*
* The buffering algorithm is attributed to Rodney Ruddock of
* the University of Guelph, Guelph, Ontario.
*
* The cbc.c encryption code is adapted from
* the bdes program by Matt Bishop of Dartmouth College,
* Hanover, NH.
*
*/
#include <sys/types.h>
#include <sys/ioctl.h>
#include <sys/wait.h>
#include <ctype.h>
#include <locale.h>
#include <pwd.h>
#include <setjmp.h>
#include "ed.h"
#ifdef _POSIX_SOURCE
static sigjmp_buf env;
#else
static jmp_buf env;
#endif
/* static buffers */
char stdinbuf[1]; /* stdin buffer */
static char *shcmd; /* shell command buffer */
static int shcmdsz; /* shell command buffer size */
static int shcmdi; /* shell command buffer index */
char *ibuf; /* ed command-line buffer */
int ibufsz; /* ed command-line buffer size */
char *ibufp; /* pointer to ed command-line buffer */
/* global flags */
int des = 0; /* if set, use crypt(3) for i/o */
static int garrulous = 0; /* if set, print all error messages */
int isbinary; /* if set, buffer contains ASCII NULs */
int isglobal; /* if set, doing a global command */
int modified; /* if set, buffer modified since last write */
int mutex = 0; /* if set, signals set "sigflags" */
static int red = 0; /* if set, restrict shell/directory access */
int scripted = 0; /* if set, suppress diagnostics */
int sigflags = 0; /* if set, signals received while mutex set */
static int sigactive = 0; /* if set, signal handlers are enabled */
static char old_filename[PATH_MAX] = ""; /* default filename */
long current_addr; /* current address in editor buffer */
long addr_last; /* last address in editor buffer */
int lineno; /* script line number */
static const char *prompt; /* command-line prompt */
static const char *dps = "*"; /* default command-line prompt */
static const char *usage = "usage: %s [-] [-sx] [-p string] [file]\n";
/* ed: line editor */
int
main(volatile int argc, char ** volatile argv)
{
int c, n;
long status = 0;
(void)setlocale(LC_ALL, "");
red = (n = strlen(argv[0])) > 2 && argv[0][n - 3] == 'r';
top:
while ((c = getopt(argc, argv, "p:sx")) != -1)
switch(c) {
case 'p': /* set prompt */
prompt = optarg;
break;
case 's': /* run script */
scripted = 1;
break;
case 'x': /* use crypt */
#ifdef DES
des = get_keyword();
#else
fprintf(stderr, "crypt unavailable\n?\n");
#endif
break;
default:
fprintf(stderr, usage, red ? "red" : "ed");
exit(1);
}
argv += optind;
argc -= optind;
if (argc && **argv == '-') {
scripted = 1;
if (argc > 1) {
optind = 1;
goto top;
}
argv++;
argc--;
}
/* assert: reliable signals! */
#ifdef SIGWINCH
handle_winch(SIGWINCH);
if (isatty(0)) signal(SIGWINCH, handle_winch);
#endif
signal(SIGHUP, signal_hup);
signal(SIGQUIT, SIG_IGN);
signal(SIGINT, signal_int);
#ifdef _POSIX_SOURCE
if ((status = sigsetjmp(env, 1)))
#else
if ((status = setjmp(env)))
#endif
{
fputs("\n?\n", stderr);
errmsg = "interrupt";
} else {
init_buffers();
sigactive = 1; /* enable signal handlers */
if (argc && **argv && is_legal_filename(*argv)) {
if (read_file(*argv, 0) < 0 && !isatty(0))
quit(2);
else if (**argv != '!')
if (strlcpy(old_filename, *argv, sizeof(old_filename))
>= sizeof(old_filename))
quit(2);
} else if (argc) {
fputs("?\n", stderr);
if (**argv == '\0')
errmsg = "invalid filename";
if (!isatty(0))
quit(2);
}
}
for (;;) {
if (status < 0 && garrulous)
fprintf(stderr, "%s\n", errmsg);
if (prompt) {
printf("%s", prompt);
fflush(stdout);
}
if ((n = get_tty_line()) < 0) {
status = ERR;
continue;
} else if (n == 0) {
if (modified && !scripted) {
fputs("?\n", stderr);
errmsg = "warning: file modified";
if (!isatty(0)) {
if (garrulous)
fprintf(stderr,
"script, line %d: %s\n",
lineno, errmsg);
quit(2);
}
clearerr(stdin);
modified = 0;
status = EMOD;
continue;
} else
quit(0);
} else if (ibuf[n - 1] != '\n') {
/* discard line */
errmsg = "unexpected end-of-file";
clearerr(stdin);
status = ERR;
continue;
}
isglobal = 0;
if ((status = extract_addr_range()) >= 0 &&
(status = exec_command()) >= 0)
if (!status ||
(status = display_lines(current_addr, current_addr,
status)) >= 0)
continue;
switch (status) {
case EOF:
quit(0);
case EMOD:
modified = 0;
fputs("?\n", stderr); /* give warning */
errmsg = "warning: file modified";
if (!isatty(0)) {
if (garrulous)
fprintf(stderr, "script, line %d: %s\n",
lineno, errmsg);
quit(2);
}
break;
case FATAL:
if (!isatty(0)) {
if (garrulous)
fprintf(stderr, "script, line %d: %s\n",
lineno, errmsg);
} else if (garrulous)
fprintf(stderr, "%s\n", errmsg);
quit(3);
default:
fputs("?\n", stderr);
if (!isatty(0)) {
if (garrulous)
fprintf(stderr, "script, line %d: %s\n",
lineno, errmsg);
quit(2);
}
break;
}
}
/*NOTREACHED*/
}
long first_addr, second_addr;
static long addr_cnt;
/* extract_addr_range: get line addresses from the command buffer until an
illegal address is seen; return status */
int
extract_addr_range(void)
{
long addr;
addr_cnt = 0;
first_addr = second_addr = current_addr;
while ((addr = next_addr()) >= 0) {
addr_cnt++;
first_addr = second_addr;
second_addr = addr;
if (*ibufp != ',' && *ibufp != ';')
break;
else if (*ibufp++ == ';')
current_addr = addr;
}
if ((addr_cnt = min(addr_cnt, 2)) == 1 || second_addr != addr)
first_addr = second_addr;
return (addr == ERR) ? ERR : 0;
}
#define SKIP_BLANKS() while (isspace((unsigned char)*ibufp) && *ibufp != '\n') ibufp++
#define MUST_BE_FIRST() do { \
if (!first) { \
errmsg = "invalid address"; \
return ERR; \
} \
} while (0)
/* next_addr: return the next line address in the command buffer */
long
next_addr(void)
{
const char *hd;
long addr = current_addr;
long n;
int first = 1;
int c;
SKIP_BLANKS();
for (hd = ibufp;; first = 0)
switch (c = *ibufp) {
case '+':
case '\t':
case ' ':
case '-':
case '^':
ibufp++;
SKIP_BLANKS();
if (isdigit((unsigned char)*ibufp)) {
STRTOL(n, ibufp);
addr += (c == '-' || c == '^') ? -n : n;
} else if (!isspace((unsigned char)c))
addr += (c == '-' || c == '^') ? -1 : 1;
break;
case '0': case '1': case '2':
case '3': case '4': case '5':
case '6': case '7': case '8': case '9':
MUST_BE_FIRST();
STRTOL(addr, ibufp);
break;
case '.':
case '$':
MUST_BE_FIRST();
ibufp++;
addr = (c == '.') ? current_addr : addr_last;
break;
case '/':
case '?':
MUST_BE_FIRST();
if ((addr = get_matching_node_addr(
get_compiled_pattern(), c == '/')) < 0)
return ERR;
else if (c == *ibufp)
ibufp++;
break;
case '\'':
MUST_BE_FIRST();
ibufp++;
if ((addr = get_marked_node_addr(*ibufp++)) < 0)
return ERR;
break;
case '%':
case ',':
case ';':
if (first) {
ibufp++;
addr_cnt++;
second_addr = (c == ';') ? current_addr : 1;
addr = addr_last;
break;
}
/* FALLTHROUGH */
default:
if (ibufp == hd)
return EOF;
else if (addr < 0 || addr_last < addr) {
errmsg = "invalid address";
return ERR;
} else
return addr;
}
/* NOTREACHED */
}
#ifdef BACKWARDS
/* GET_THIRD_ADDR: get a legal address from the command buffer */
#define GET_THIRD_ADDR(addr) \
{ \
long ol1, ol2; \
\
ol1 = first_addr, ol2 = second_addr; \
if (extract_addr_range() < 0) \
return ERR; \
else if (addr_cnt == 0) { \
errmsg = "destination expected"; \
return ERR; \
} else if (second_addr < 0 || addr_last < second_addr) { \
errmsg = "invalid address"; \
return ERR; \
} \
addr = second_addr; \
first_addr = ol1, second_addr = ol2; \
}
#else /* BACKWARDS */
/* GET_THIRD_ADDR: get a legal address from the command buffer */
#define GET_THIRD_ADDR(addr) \
{ \
long ol1, ol2; \
\
ol1 = first_addr, ol2 = second_addr; \
if (extract_addr_range() < 0) \
return ERR; \
if (second_addr < 0 || addr_last < second_addr) { \
errmsg = "invalid address"; \
return ERR; \
} \
addr = second_addr; \
first_addr = ol1, second_addr = ol2; \
}
#endif
/* GET_COMMAND_SUFFIX: verify the command suffix in the command buffer */
#define GET_COMMAND_SUFFIX() { \
int done = 0; \
do { \
switch(*ibufp) { \
case 'p': \
gflag |= GPR, ibufp++; \
break; \
case 'l': \
gflag |= GLS, ibufp++; \
break; \
case 'n': \
gflag |= GNP, ibufp++; \
break; \
default: \
done++; \
} \
} while (!done); \
if (*ibufp++ != '\n') { \
errmsg = "invalid command suffix"; \
return ERR; \
} \
}
/* sflags */
#define SGG 001 /* complement previous global substitute suffix */
#define SGP 002 /* complement previous print suffix */
#define SGR 004 /* use last regex instead of last pat */
#define SGF 010 /* repeat last substitution */
int patlock = 0; /* if set, pattern not freed by get_compiled_pattern() */
long rows = 22; /* scroll length: ws_row - 2 */
/* exec_command: execute the next command in command buffer; return print
request, if any */
int
exec_command(void)
{
static pattern_t *pat = NULL;
static int sgflag = 0;
static long sgnum = 0;
pattern_t *tpat;
char *fnp;
int gflag = 0;
int sflags = 0;
long addr = 0;
int n = 0;
int c;
SKIP_BLANKS();
switch(c = *ibufp++) {
case 'a':
GET_COMMAND_SUFFIX();
if (!isglobal) clear_undo_stack();
if (append_lines(second_addr) < 0)
return ERR;
break;
case 'c':
if (check_addr_range(current_addr, current_addr) < 0)
return ERR;
GET_COMMAND_SUFFIX();
if (!isglobal) clear_undo_stack();
if (delete_lines(first_addr, second_addr) < 0 ||
append_lines(current_addr) < 0)
return ERR;
break;
case 'd':
if (check_addr_range(current_addr, current_addr) < 0)
return ERR;
GET_COMMAND_SUFFIX();
if (!isglobal) clear_undo_stack();
if (delete_lines(first_addr, second_addr) < 0)
return ERR;
else if ((addr = INC_MOD(current_addr, addr_last)) != 0)
current_addr = addr;
break;
case 'e':
if (modified && !scripted)
return EMOD;
/* FALLTHROUGH */
case 'E':
if (addr_cnt > 0) {
errmsg = "unexpected address";
return ERR;
} else if (!isspace((unsigned char)*ibufp)) {
errmsg = "unexpected command suffix";
return ERR;
} else if ((fnp = get_filename()) == NULL)
return ERR;
GET_COMMAND_SUFFIX();
if (delete_lines(1, addr_last) < 0)
return ERR;
clear_undo_stack();
if (close_sbuf() < 0)
return ERR;
else if (open_sbuf() < 0)
return FATAL;
if (*fnp && *fnp != '!') strcpy(old_filename, fnp);
#ifdef BACKWARDS
if (*fnp == '\0' && *old_filename == '\0') {
errmsg = "no current filename";
return ERR;
}
#endif
if (read_file(*fnp ? fnp : old_filename, 0) < 0)
return ERR;
clear_undo_stack();
modified = 0;
u_current_addr = u_addr_last = -1;
break;
case 'f':
if (addr_cnt > 0) {
errmsg = "unexpected address";
return ERR;
} else if (!isspace((unsigned char)*ibufp)) {
errmsg = "unexpected command suffix";
return ERR;
} else if ((fnp = get_filename()) == NULL)
return ERR;
else if (*fnp == '!') {
errmsg = "invalid redirection";
return ERR;
}
GET_COMMAND_SUFFIX();
if (*fnp) strcpy(old_filename, fnp);
printf("%s\n", strip_escapes(old_filename));
break;
case 'g':
case 'v':
case 'G':
case 'V':
if (isglobal) {
errmsg = "cannot nest global commands";
return ERR;
} else if (check_addr_range(1, addr_last) < 0)
return ERR;
else if (build_active_list(c == 'g' || c == 'G') < 0)
return ERR;
else if ((n = (c == 'G' || c == 'V')))
GET_COMMAND_SUFFIX();
isglobal++;
if (exec_global(n, gflag) < 0)
return ERR;
break;
case 'h':
if (addr_cnt > 0) {
errmsg = "unexpected address";
return ERR;
}
GET_COMMAND_SUFFIX();
if (*errmsg) fprintf(stderr, "%s\n", errmsg);
break;
case 'H':
if (addr_cnt > 0) {
errmsg = "unexpected address";
return ERR;
}
GET_COMMAND_SUFFIX();
if ((garrulous = 1 - garrulous) && *errmsg)
fprintf(stderr, "%s\n", errmsg);
break;
case 'i':
if (second_addr == 0) {
errmsg = "invalid address";
return ERR;
}
GET_COMMAND_SUFFIX();
if (!isglobal) clear_undo_stack();
if (append_lines(second_addr - 1) < 0)
return ERR;
break;
case 'j':
if (check_addr_range(current_addr, current_addr + 1) < 0)
return ERR;
GET_COMMAND_SUFFIX();
if (!isglobal) clear_undo_stack();
if (first_addr != second_addr &&
join_lines(first_addr, second_addr) < 0)
return ERR;
break;
case 'k':
c = *ibufp++;
if (second_addr == 0) {
errmsg = "invalid address";
return ERR;
}
GET_COMMAND_SUFFIX();
if (mark_line_node(get_addressed_line_node(second_addr), c) < 0)
return ERR;
break;
case 'l':
if (check_addr_range(current_addr, current_addr) < 0)
return ERR;
GET_COMMAND_SUFFIX();
if (display_lines(first_addr, second_addr, gflag | GLS) < 0)
return ERR;
gflag = 0;
break;
case 'm':
if (check_addr_range(current_addr, current_addr) < 0)
return ERR;
GET_THIRD_ADDR(addr);
if (first_addr <= addr && addr < second_addr) {
errmsg = "invalid destination";
return ERR;
}
GET_COMMAND_SUFFIX();
if (!isglobal) clear_undo_stack();
if (move_lines(addr) < 0)
return ERR;
break;
case 'n':
if (check_addr_range(current_addr, current_addr) < 0)
return ERR;
GET_COMMAND_SUFFIX();
if (display_lines(first_addr, second_addr, gflag | GNP) < 0)
return ERR;
gflag = 0;
break;
case 'p':
if (check_addr_range(current_addr, current_addr) < 0)
return ERR;
GET_COMMAND_SUFFIX();
if (display_lines(first_addr, second_addr, gflag | GPR) < 0)
return ERR;
gflag = 0;
break;
case 'P':
if (addr_cnt > 0) {
errmsg = "unexpected address";
return ERR;
}
GET_COMMAND_SUFFIX();
prompt = prompt ? NULL : optarg ? optarg : dps;
break;
case 'q':
case 'Q':
if (addr_cnt > 0) {
errmsg = "unexpected address";
return ERR;
}
GET_COMMAND_SUFFIX();
gflag = (modified && !scripted && c == 'q') ? EMOD : EOF;
break;
case 'r':
if (!isspace((unsigned char)*ibufp)) {
errmsg = "unexpected command suffix";
return ERR;
} else if (addr_cnt == 0)
second_addr = addr_last;
if ((fnp = get_filename()) == NULL)
return ERR;
GET_COMMAND_SUFFIX();
if (!isglobal) clear_undo_stack();
if (*old_filename == '\0' && *fnp != '!')
strcpy(old_filename, fnp);
#ifdef BACKWARDS
if (*fnp == '\0' && *old_filename == '\0') {
errmsg = "no current filename";
return ERR;
}
#endif
if ((addr = read_file(*fnp ? fnp : old_filename, second_addr)) < 0)
return ERR;
else if (addr && addr != addr_last)
modified = 1;
break;
case 's':
do {
switch(*ibufp) {
case '\n':
sflags |=SGF;
break;
case 'g':
sflags |= SGG;
ibufp++;
break;
case 'p':
sflags |= SGP;
ibufp++;
break;
case 'r':
sflags |= SGR;
ibufp++;
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
STRTOL(sgnum, ibufp);
sflags |= SGF;
sgflag &= ~GSG; /* override GSG */
break;
default:
if (sflags) {
errmsg = "invalid command suffix";
return ERR;
}
}
} while (sflags && *ibufp != '\n');
if (sflags && !pat) {
errmsg = "no previous substitution";
return ERR;
} else if (sflags & SGG)
sgnum = 0; /* override numeric arg */
if (*ibufp != '\n' && *(ibufp + 1) == '\n') {
errmsg = "invalid pattern delimiter";
return ERR;
}
tpat = pat;
SPL1();
if ((!sflags || (sflags & SGR)) &&
(tpat = get_compiled_pattern()) == NULL) {
SPL0();
return ERR;
} else if (tpat != pat) {
if (pat) {
regfree(pat);
free(pat);
}
pat = tpat;
patlock = 1; /* reserve pattern */
}
SPL0();
if (!sflags && extract_subst_tail(&sgflag, &sgnum) < 0)
return ERR;
else if (isglobal)
sgflag |= GLB;
else
sgflag &= ~GLB;
if (sflags & SGG)
sgflag ^= GSG;
if (sflags & SGP)
sgflag ^= GPR, sgflag &= ~(GLS | GNP);
do {
switch(*ibufp) {
case 'p':
sgflag |= GPR, ibufp++;
break;
case 'l':
sgflag |= GLS, ibufp++;
break;
case 'n':
sgflag |= GNP, ibufp++;
break;
default:
n++;
}
} while (!n);
if (check_addr_range(current_addr, current_addr) < 0)
return ERR;
GET_COMMAND_SUFFIX();
if (!isglobal) clear_undo_stack();
if (search_and_replace(pat, sgflag, sgnum) < 0)
return ERR;
break;
case 't':
if (check_addr_range(current_addr, current_addr) < 0)
return ERR;
GET_THIRD_ADDR(addr);
GET_COMMAND_SUFFIX();
if (!isglobal) clear_undo_stack();
if (copy_lines(addr) < 0)
return ERR;
break;
case 'u':
if (addr_cnt > 0) {
errmsg = "unexpected address";
return ERR;
}
GET_COMMAND_SUFFIX();
if (pop_undo_stack() < 0)
return ERR;
break;
case 'w':
case 'W':
if ((n = *ibufp) == 'q' || n == 'Q') {
gflag = EOF;
ibufp++;
}
if (!isspace((unsigned char)*ibufp)) {
errmsg = "unexpected command suffix";
return ERR;
} else if ((fnp = get_filename()) == NULL)
return ERR;
if (addr_cnt == 0 && !addr_last)
first_addr = second_addr = 0;
else if (check_addr_range(1, addr_last) < 0)
return ERR;
GET_COMMAND_SUFFIX();
if (*old_filename == '\0' && *fnp != '!')
strcpy(old_filename, fnp);
#ifdef BACKWARDS
if (*fnp == '\0' && *old_filename == '\0') {
errmsg = "no current filename";
return ERR;
}
#endif
if ((addr = write_file(*fnp ? fnp : old_filename,
(c == 'W') ? "a" : "w", first_addr, second_addr)) < 0)
return ERR;
else if (addr == addr_last)
modified = 0;
else if (modified && !scripted && n == 'q')
gflag = EMOD;
break;
case 'x':
if (addr_cnt > 0) {
errmsg = "unexpected address";
return ERR;
}
GET_COMMAND_SUFFIX();
#ifdef DES
des = get_keyword();
break;
#else
errmsg = "crypt unavailable";
return ERR;
#endif
case 'z':
#ifdef BACKWARDS
if (check_addr_range(first_addr = 1, current_addr + 1) < 0)
#else
if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0)
#endif
return ERR;
else if ('0' < *ibufp && *ibufp <= '9')
STRTOL(rows, ibufp);
GET_COMMAND_SUFFIX();
if (display_lines(second_addr, min(addr_last,
second_addr + rows), gflag) < 0)
return ERR;
gflag = 0;
break;
case '=':
GET_COMMAND_SUFFIX();
printf("%ld\n", addr_cnt ? second_addr : addr_last);
break;
case '!':
if (addr_cnt > 0) {
errmsg = "unexpected address";
return ERR;
} else if ((sflags = get_shell_command()) < 0)
return ERR;
GET_COMMAND_SUFFIX();
if (sflags) printf("%s\n", shcmd + 1);
system(shcmd + 1);
if (!scripted) printf("!\n");
break;
case '\n':
#ifdef BACKWARDS
if (check_addr_range(first_addr = 1, current_addr + 1) < 0
#else
if (check_addr_range(first_addr = 1, current_addr + !isglobal) < 0
#endif
|| display_lines(second_addr, second_addr, 0) < 0)
return ERR;
break;
default:
errmsg = "unknown command";
return ERR;
}
return gflag;
}
/* check_addr_range: return status of address range check */
int
check_addr_range(long n, long m)
{
if (addr_cnt == 0) {
first_addr = n;
second_addr = m;
}
if (first_addr > second_addr || 1 > first_addr ||
second_addr > addr_last) {
errmsg = "invalid address";
return ERR;
}
return 0;
}
/* get_matching_node_addr: return the address of the next line matching a
pattern in a given direction. wrap around begin/end of editor buffer if
necessary */
long
get_matching_node_addr(pattern_t *pat, int dir)
{
char *s;
long n = current_addr;
line_t *lp;
if (!pat) return ERR;
do {
if ((n = dir ? INC_MOD(n, addr_last) : DEC_MOD(n, addr_last))) {
lp = get_addressed_line_node(n);
if ((s = get_sbuf_line(lp)) == NULL)
return ERR;
if (isbinary)
NUL_TO_NEWLINE(s, lp->len);
if (!regexec(pat, s, 0, NULL, 0))
return n;
}
} while (n != current_addr);
errmsg = "no match";
return ERR;
}
/* get_filename: return pointer to copy of filename in the command buffer */
char *
get_filename(void)
{
static char *file = NULL;
static int filesz = 0;
int n;
if (*ibufp != '\n') {
SKIP_BLANKS();
if (*ibufp == '\n') {
errmsg = "invalid filename";
return NULL;
} else if ((ibufp = get_extended_line(&n, 1)) == NULL)
return NULL;
else if (*ibufp == '!') {
ibufp++;
if ((n = get_shell_command()) < 0)
return NULL;
if (n)
printf("%s\n", shcmd + 1);
return shcmd;
} else if (n > PATH_MAX - 1) {
errmsg = "filename too long";
return NULL;
}
}
#ifndef BACKWARDS
else if (*old_filename == '\0') {
errmsg = "no current filename";
return NULL;
}
#endif
REALLOC(file, filesz, PATH_MAX, NULL);
for (n = 0; *ibufp != '\n';)
file[n++] = *ibufp++;
file[n] = '\0';
return is_legal_filename(file) ? file : NULL;
}
/* get_shell_command: read a shell command from stdin; return substitution
status */
int
get_shell_command(void)
{
static char *buf = NULL;
static int n = 0;
char *s; /* substitution char pointer */
int i = 0;
int j = 0;
if (red) {
errmsg = "shell access restricted";
return ERR;
} else if ((s = ibufp = get_extended_line(&j, 1)) == NULL)
return ERR;
REALLOC(buf, n, j + 1, ERR);
buf[i++] = '!'; /* prefix command w/ bang */
while (*ibufp != '\n')
switch (*ibufp) {
default:
REALLOC(buf, n, i + 2, ERR);
buf[i++] = *ibufp;
if (*ibufp++ == '\\')
buf[i++] = *ibufp++;
break;
case '!':
if (s != ibufp) {
REALLOC(buf, n, i + 1, ERR);
buf[i++] = *ibufp++;
}
#ifdef BACKWARDS
else if (shcmd == NULL || *(shcmd + 1) == '\0')
#else
else if (shcmd == NULL)
#endif
{
errmsg = "no previous command";
return ERR;