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BSD 4_4_Lite2 release
[unix-history] / usr / src / contrib / nvi.1.43 / ex / ex_argv.c
/*-
* Copyright (c) 1993, 1994
* The Regents of the University of California. 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.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static char sccsid[] = "@(#)ex_argv.c 9.4 (Berkeley) 12/2/94";
#endif /* not lint */
#include <sys/types.h>
#include <sys/queue.h>
#include <sys/time.h>
#include <bitstring.h>
#include <ctype.h>
#include <errno.h>
#include <limits.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <termios.h>
#include <unistd.h>
#include "compat.h"
#include <db.h>
#include <regex.h>
#include "vi.h"
#include "excmd.h"
static int argv_alloc __P((SCR *, size_t));
static int argv_fexp __P((SCR *, EXCMDARG *,
char *, size_t, char *, size_t *, char **, size_t *, int));
static int argv_sexp __P((SCR *, char **, size_t *, size_t *));
/*
* argv_init --
* Build a prototype arguments list.
*/
int
argv_init(sp, excp)
SCR *sp;
EXCMDARG *excp;
{
EX_PRIVATE *exp;
exp = EXP(sp);
exp->argsoff = 0;
argv_alloc(sp, 1);
excp->argv = exp->args;
excp->argc = exp->argsoff;
return (0);
}
/*
* argv_exp0 --
* Append a string to the argument list.
*/
int
argv_exp0(sp, excp, cmd, cmdlen)
SCR *sp;
EXCMDARG *excp;
char *cmd;
size_t cmdlen;
{
EX_PRIVATE *exp;
exp = EXP(sp);
argv_alloc(sp, cmdlen);
memmove(exp->args[exp->argsoff]->bp, cmd, cmdlen);
exp->args[exp->argsoff]->bp[cmdlen] = '\0';
exp->args[exp->argsoff]->len = cmdlen;
++exp->argsoff;
excp->argv = exp->args;
excp->argc = exp->argsoff;
return (0);
}
/*
* argv_exp1 --
* Do file name expansion on a string, and append it to the
* argument list.
*/
int
argv_exp1(sp, excp, cmd, cmdlen, is_bang)
SCR *sp;
EXCMDARG *excp;
char *cmd;
size_t cmdlen;
int is_bang;
{
EX_PRIVATE *exp;
size_t blen, len;
char *bp, *p, *t;
GET_SPACE_RET(sp, bp, blen, 512);
len = 0;
exp = EXP(sp);
if (argv_fexp(sp, excp, cmd, cmdlen, bp, &len, &bp, &blen, is_bang)) {
FREE_SPACE(sp, bp, blen);
return (1);
}
/* If it's empty, we're done. */
if (len != 0) {
for (p = bp, t = bp + len; p < t; ++p)
if (!isblank(*p))
break;
if (p == t)
goto ret;
} else
goto ret;
(void)argv_exp0(sp, excp, bp, len);
ret: FREE_SPACE(sp, bp, blen);
return (0);
}
/*
* argv_exp2 --
* Do file name and shell expansion on a string, and append it to
* the argument list.
*/
int
argv_exp2(sp, excp, cmd, cmdlen)
SCR *sp;
EXCMDARG *excp;
char *cmd;
size_t cmdlen;
{
size_t blen, len, n;
int rval;
char *bp, *mp, *p;
GET_SPACE_RET(sp, bp, blen, 512);
#define SHELLECHO "echo "
#define SHELLOFFSET (sizeof(SHELLECHO) - 1)
memmove(bp, SHELLECHO, SHELLOFFSET);
p = bp + SHELLOFFSET;
len = SHELLOFFSET;
#if defined(DEBUG) && 0
TRACE(sp, "file_argv: {%.*s}\n", (int)cmdlen, cmd);
#endif
if (argv_fexp(sp, excp, cmd, cmdlen, p, &len, &bp, &blen, 0)) {
rval = 1;
goto err;
}
#if defined(DEBUG) && 0
TRACE(sp, "before shell: %d: {%s}\n", len, bp);
#endif
/*
* Do shell word expansion -- it's very, very hard to figure out what
* magic characters the user's shell expects. Historically, it was a
* union of v7 shell and csh meta characters. We match that practice
* by default, so ":read \%" tries to read a file named '%'. It would
* make more sense to pass any special characters through the shell,
* but then, if your shell was csh, the above example will behave
* differently in nvi than in vi. If you want to get other characters
* passed through to your shell, change the "meta" option.
*
* To avoid a function call per character, we do a first pass through
* the meta characters looking for characters that aren't expected
* to be there.
*/
for (p = mp = O_STR(sp, O_SHELLMETA); *p != '\0'; ++p)
if (isblank(*p) || isalnum(*p))
break;
if (*p != '\0') {
for (p = bp, n = len; n > 0; --n, ++p)
if (strchr(mp, *p) != NULL)
break;
} else
for (p = bp, n = len; n > 0; --n, ++p)
if (!isblank(*p) &&
!isalnum(*p) && strchr(mp, *p) != NULL)
break;
if (n > 0) {
if (argv_sexp(sp, &bp, &blen, &len)) {
rval = 1;
goto err;
}
p = bp;
} else {
p = bp + SHELLOFFSET;
len -= SHELLOFFSET;
}
#if defined(DEBUG) && 0
TRACE(sp, "after shell: %d: {%s}\n", len, bp);
#endif
rval = argv_exp3(sp, excp, p, len);
err: FREE_SPACE(sp, bp, blen);
return (rval);
}
/*
* argv_exp3 --
* Take a string and break it up into an argv, which is appended
* to the argument list.
*/
int
argv_exp3(sp, excp, cmd, cmdlen)
SCR *sp;
EXCMDARG *excp;
char *cmd;
size_t cmdlen;
{
EX_PRIVATE *exp;
size_t len;
int ch, off;
char *ap, *p;
for (exp = EXP(sp); cmdlen > 0; ++exp->argsoff) {
/* Skip any leading whitespace. */
for (; cmdlen > 0; --cmdlen, ++cmd) {
ch = *cmd;
if (!isblank(ch))
break;
}
if (cmdlen == 0)
break;
/*
* Determine the length of this whitespace delimited
* argument.
*
* QUOTING NOTE:
*
* Skip any character preceded by the user's quoting
* character.
*/
for (ap = cmd, len = 0; cmdlen > 0; ++cmd, --cmdlen, ++len) {
ch = *cmd;
if (IS_ESCAPE(sp, ch) && cmdlen > 1) {
++cmd;
--cmdlen;
} else if (isblank(ch))
break;
}
/*
* Copy the argument into place.
*
* QUOTING NOTE:
*
* Lose quote chars.
*/
argv_alloc(sp, len);
off = exp->argsoff;
exp->args[off]->len = len;
for (p = exp->args[off]->bp; len > 0; --len, *p++ = *ap++)
if (IS_ESCAPE(sp, *ap))
++ap;
*p = '\0';
}
excp->argv = exp->args;
excp->argc = exp->argsoff;
#if defined(DEBUG) && 0
for (cnt = 0; cnt < exp->argsoff; ++cnt)
TRACE(sp, "arg %d: {%s}\n", cnt, exp->argv[cnt]);
#endif
return (0);
}
/*
* argv_fexp --
* Do file name and bang command expansion.
*/
static int
argv_fexp(sp, excp, cmd, cmdlen, p, lenp, bpp, blenp, is_bang)
SCR *sp;
EXCMDARG *excp;
char *cmd, *p, **bpp;
size_t cmdlen, *lenp, *blenp;
int is_bang;
{
EX_PRIVATE *exp;
char *bp, *t;
size_t blen, len, tlen;
/* Replace file name characters. */
for (bp = *bpp, blen = *blenp, len = *lenp; cmdlen > 0; --cmdlen, ++cmd)
switch (*cmd) {
case '!':
if (!is_bang)
goto ins_ch;
exp = EXP(sp);
if (exp->lastbcomm == NULL) {
msgq(sp, M_ERR,
"123|No previous command to replace \"!\"");
return (1);
}
len += tlen = strlen(exp->lastbcomm);
ADD_SPACE_RET(sp, bp, blen, len);
memmove(p, exp->lastbcomm, tlen);
p += tlen;
F_SET(excp, E_MODIFY);
break;
case '%':
if ((t = sp->frp->name) == NULL) {
msgq(sp, M_ERR,
"124|No filename to substitute for %%");
return (1);
}
tlen = strlen(t);
len += tlen;
ADD_SPACE_RET(sp, bp, blen, len);
memmove(p, t, tlen);
p += tlen;
F_SET(excp, E_MODIFY);
break;
case '#':
if ((t = sp->alt_name) == NULL) {
msgq(sp, M_ERR,
"125|No filename to substitute for #");
return (1);
}
len += tlen = strlen(t);
ADD_SPACE_RET(sp, bp, blen, len);
memmove(p, t, tlen);
p += tlen;
F_SET(excp, E_MODIFY);
break;
case '\\':
/*
* QUOTING NOTE:
*
* Strip any backslashes that protected the file
* expansion characters.
*/
if (cmdlen > 1 &&
(cmd[1] == '%' || cmd[1] == '#' || cmd[1] == '!')) {
++cmd;
--cmdlen;
}
/* FALLTHROUGH */
default:
ins_ch: ++len;
ADD_SPACE_RET(sp, bp, blen, len);
*p++ = *cmd;
}
/* Nul termination. */
++len;
ADD_SPACE_RET(sp, bp, blen, len);
*p = '\0';
/* Return the new string length, buffer, buffer length. */
*lenp = len - 1;
*bpp = bp;
*blenp = blen;
return (0);
}
/*
* argv_alloc --
* Make more space for arguments.
*/
static int
argv_alloc(sp, len)
SCR *sp;
size_t len;
{
ARGS *ap;
EX_PRIVATE *exp;
int cnt, off;
/*
* Allocate room for another argument, always leaving
* enough room for an ARGS structure with a length of 0.
*/
#define INCREMENT 20
exp = EXP(sp);
off = exp->argsoff;
if (exp->argscnt == 0 || off + 2 >= exp->argscnt - 1) {
cnt = exp->argscnt + INCREMENT;
REALLOC(sp, exp->args, ARGS **, cnt * sizeof(ARGS *));
if (exp->args == NULL) {
(void)argv_free(sp);
goto mem;
}
memset(&exp->args[off], 0, INCREMENT * sizeof(ARGS *));
exp->argscnt = cnt;
}
/* First argument. */
if (exp->args[off] == NULL) {
CALLOC(sp, exp->args[off], ARGS *, 1, sizeof(ARGS));
if (exp->args[off] == NULL)
goto mem;
}
/* First argument buffer. */
ap = exp->args[off];
ap->len = 0;
if (ap->blen < len + 1) {
ap->blen = len + 1;
REALLOC(sp, ap->bp, CHAR_T *, ap->blen * sizeof(CHAR_T));
if (ap->bp == NULL) {
ap->bp = NULL;
ap->blen = 0;
F_CLR(ap, A_ALLOCATED);
mem: msgq(sp, M_SYSERR, NULL);
return (1);
}
F_SET(ap, A_ALLOCATED);
}
/* Second argument. */
if (exp->args[++off] == NULL) {
CALLOC(sp, exp->args[off], ARGS *, 1, sizeof(ARGS));
if (exp->args[off] == NULL)
goto mem;
}
/* 0 length serves as end-of-argument marker. */
exp->args[off]->len = 0;
return (0);
}
/*
* argv_free --
* Free up argument structures.
*/
int
argv_free(sp)
SCR *sp;
{
EX_PRIVATE *exp;
int off;
exp = EXP(sp);
if (exp->args != NULL) {
for (off = 0; off < exp->argscnt; ++off) {
if (exp->args[off] == NULL)
continue;
if (F_ISSET(exp->args[off], A_ALLOCATED))
free(exp->args[off]->bp);
FREE(exp->args[off], sizeof(ARGS));
}
FREE(exp->args, exp->argscnt * sizeof(ARGS *));
}
exp->args = NULL;
exp->argscnt = 0;
exp->argsoff = 0;
return (0);
}
/*
* argv_sexp --
* Fork a shell, pipe a command through it, and read the output into
* a buffer.
*/
static int
argv_sexp(sp, bpp, blenp, lenp)
SCR *sp;
char **bpp;
size_t *blenp, *lenp;
{
FILE *efp, *ifp;
pid_t pid;
size_t blen, len;
int ch, nf1, nf2, rval, err_output[2], std_output[2];
char *bp, *p, *t, *sh, *sh_path;
bp = *bpp;
blen = *blenp;
sh_path = O_STR(sp, O_SHELL);
if ((sh = strrchr(sh_path, '/')) == NULL)
sh = sh_path;
else
++sh;
/*
* There are two different processes running through this code, named
* the utility (the shell) and the parent. The utility reads standard
* input and writes standard output and standard error output. The
* parent reads the standard output and standard error output, copying
* the former into a buffer and the latter into the error message log.
*
* The parent reads std_output[0] and err_output[0], and the utility
* writes std_output[1] and err_output[1].
*/
ifp = efp = NULL;
std_output[0] = std_output[1] = err_output[0] = err_output[1] = -1;
if (pipe(std_output) < 0 || pipe(err_output)) {
msgq(sp, M_SYSERR, "pipe");
goto err;
}
if ((ifp = fdopen(std_output[0], "r")) == NULL ||
(efp = fdopen(err_output[0], "r")) == NULL) {
msgq(sp, M_SYSERR, "fdopen");
goto err;
}
/*
* Do the minimal amount of work possible, the shell is going
* to run briefly and then exit. We hope.
*/
SIGBLOCK(sp->gp);
switch (pid = vfork()) {
case -1: /* Error. */
SIGUNBLOCK(sp->gp);
msgq(sp, M_SYSERR, "vfork");
err: if (ifp != NULL)
(void)fclose(ifp);
else if (std_output[0] != -1)
close(std_output[0]);
if (efp != NULL)
(void)fclose(efp);
else if (err_output[0] != -1)
close(std_output[0]);
if (std_output[1] != -1)
close(std_output[0]);
if (err_output[1] != -1)
close(std_output[0]);
return (1);
case 0: /* Utility. */
/* The utility has default signal behavior. */
sig_end(sp);
/* Redirect stdout/stderr to the write end of the pipe. */
(void)dup2(std_output[1], STDOUT_FILENO);
(void)dup2(err_output[1], STDERR_FILENO);
/* Close the utility's file descriptors. */
(void)close(std_output[0]);
(void)close(std_output[1]);
(void)close(err_output[0]);
(void)close(err_output[1]);
/* Assume that all shells have -c. */
execl(sh_path, sh, "-c", bp, NULL);
p = msg_print(sp, sh_path, &nf1);
msgq(sp, M_SYSERR, "126|Error: execl: %s", p);
if (nf1)
FREE_SPACE(sp, p, 0);
_exit(127);
default: /* Parent. */
SIGUNBLOCK(sp->gp);
/* Close the pipe ends the parent won't use. */
(void)close(std_output[1]);
(void)close(err_output[1]);
break;
}
rval = 0;
/*
* Copy process standard output into a buffer.
*
* !!!
* Historic vi apparently discarded leading \n and \r's from
* the shell output stream. We don't on the grounds that any
* shell that does that is broken.
*/
for (p = bp, len = 0, ch = EOF;
(ch = getc(ifp)) != EOF; *p++ = ch, --blen, ++len)
if (blen < 5) {
ADD_SPACE_GOTO(sp, bp, blen, *blenp * 2);
p = bp + len;
blen = *blenp - len;
}
/* Delete the final newline, nul terminate the string. */
if (p > bp && (p[-1] == '\n' || p[-1] == '\r')) {
--len;
*--p = '\0';
} else
*p = '\0';
*lenp = len;
*bpp = bp; /* *blenp is already updated. */
if (ferror(ifp))
goto ioerr;
/*
* Copy process standard error into a buffer. We don't set
* rval if we get error output -- as long as the shell exits
* okay, might as well go ahead.
*/
if ((ch = getc(efp)) != EOF) {
(void)ungetc(ch, efp);
GET_SPACE_RET(sp, bp, blen, 1024);
p = msg_print(sp, sh, &nf1);
while (fgets(bp, blen, efp) != NULL) {
if ((t = strchr(bp, '\n')) != NULL)
*t = '\0';
t = msg_print(sp, bp, &nf2);
msgq(sp, M_ERR, "%s: %s", p, t);
if (nf2)
FREE_SPACE(sp, t, 0);
}
if (nf1)
FREE_SPACE(sp, p, 0);
FREE_SPACE(sp, bp, blen);
}
if (ferror(efp)) {
ioerr: p = msg_print(sp, sh, &nf1);
msgq(sp, M_ERR, "127|I/O error: %s", p);
if (nf1)
FREE_SPACE(sp, p, 0);
binc_err: rval = 1;
}
/* Wait for the process. */
if (proc_wait(sp, (long)pid, sh, 0))
rval = 1;
if (ifp != NULL)
(void)fclose(ifp);
if (efp != NULL)
(void)fclose(efp);
return (rval);
}
Continuous source code history from original PDP-7 UNIX to FreeBSD 2, the first fully unencumbered FreeBSD release.