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/* $OpenBSD: apply.c,v 1.29 2018/04/01 17:45:05 bluhm Exp $ */
/* $NetBSD: apply.c,v 1.3 1995/03/25 03:38:23 glass Exp $ */
/*-
* Copyright (c) 1994
* The Regents of the University of California. All rights reserved.
*
* This code is derived from software contributed to Berkeley by
* Jan-Simon Pendry.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/wait.h>
#include <ctype.h>
#include <err.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#define ISMAGICNO(p) \
(p)[0] == magic && isdigit((unsigned char)(p)[1]) && (p)[1] != '0'
__dead void usage(void);
static int mysystem(const char *);
char *str;
size_t sz;
void
stradd(char *p)
{
size_t n;
n = strlen(p);
if (str == NULL) {
sz = (n / 1024 + 1) * 1024;
if ((str = malloc(sz)) == NULL)
err(1, "malloc");
*str = '\0';
} else if (sz - strlen(str) <= n) {
sz += (n / 1024 + 1) * 1024;
if ((str = realloc(str, sz)) == NULL)
err(1, "realloc");
}
strlcat(str, p, sz);
}
void
strset(char *p)
{
if (str != NULL)
str[0] = '\0';
stradd(p);
}
int
main(int argc, char *argv[])
{
int ch, debug, i, magic, n, nargs, rval;
char buf[4], *cmd, *p;
if (pledge("stdio proc exec", NULL) == -1)
err(1, "pledge");
debug = 0;
magic = '%'; /* Default magic char is `%'. */
nargs = -1;
while ((ch = getopt(argc, argv, "a:d0123456789")) != -1)
switch (ch) {
case 'a':
if (optarg[0] == '\0' || optarg[1] != '\0')
errx(1,
"illegal magic character specification.");
magic = optarg[0];
break;
case 'd':
debug = 1;
break;
case '0': case '1': case '2': case '3': case '4':
case '5': case '6': case '7': case '8': case '9':
if (nargs != -1)
errx(1,
"only one -# argument may be specified.");
nargs = ch - '0';
break;
default:
usage();
}
argc -= optind;
argv += optind;
if (argc < 2)
usage();
/*
* The command to run is argv[0], and the args are argv[1..].
* Look for %digit references in the command, remembering the
* largest one.
*/
for (n = 0, p = argv[0]; *p != '\0'; ++p)
if (ISMAGICNO(p)) {
++p;
if (p[0] - '0' > n)
n = p[0] - '0';
}
/*
* If there were any %digit references, then use those, otherwise
* build a new command string with sufficient %digit references at
* the end to consume (nargs) arguments each time round the loop.
* Allocate enough space to hold the maximum command.
*/
strset(argv[0]);
if (n == 0) {
/* If nargs not set, default to a single argument. */
if (nargs == -1)
nargs = 1;
for (i = 1; i <= nargs; i++) {
snprintf(buf, sizeof(buf), " %c%d", magic, i);
stradd(buf);
}
/*
* If nargs set to the special value 0, eat a single
* argument for each command execution.
*/
if (nargs == 0)
nargs = 1;
} else
nargs = n;
if ((cmd = strdup(str)) == NULL)
err(1, "strdup");
/*
* (argc) and (argv) are still offset by one to make it simpler to
* expand %digit references. At the end of the loop check for (argc)
* equals 1 means that all the (argv) has been consumed.
*/
for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) {
strset("exec ");
/* Expand command argv references. */
for (p = cmd; *p != '\0'; ++p)
if (ISMAGICNO(p))
stradd(argv[*(++p) - '0']);
else {
strlcpy(buf, p, 2);
stradd(buf);
}
/* Run the command. */
if (debug)
(void)printf("%s\n", str);
else if (mysystem(str))
rval = 1;
}
if (argc != 1)
errx(1, "expecting additional argument%s after \"%s\"",
(nargs - argc) ? "s" : "", argv[argc - 1]);
exit(rval);
}
/*
* mysystem --
* Private version of system(3). Use the user's SHELL environment
* variable as the shell to execute.
*/
static int
mysystem(const char *command)
{
static const char *name, *shell;
pid_t pid;
int pstat;
sigset_t mask, omask;
sig_t intsave, quitsave;
if (shell == NULL) {
if ((shell = getenv("SHELL")) == NULL)
shell = _PATH_BSHELL;
if ((name = strrchr(shell, '/')) == NULL)
name = shell;
else
++name;
}
if (!command) /* just checking... */
return(1);
sigemptyset(&mask);
sigaddset(&mask, SIGCHLD);
sigprocmask(SIG_BLOCK, &mask, &omask);
switch(pid = fork()) {
case -1: /* error */
err(1, "fork");
case 0: /* child */
sigprocmask(SIG_SETMASK, &omask, NULL);
execl(shell, name, "-c", command, (char *)NULL);
err(1, "%s", shell);
}
intsave = signal(SIGINT, SIG_IGN);
quitsave = signal(SIGQUIT, SIG_IGN);
pid = waitpid(pid, &pstat, 0);
sigprocmask(SIG_SETMASK, &omask, NULL);
(void)signal(SIGINT, intsave);
(void)signal(SIGQUIT, quitsave);
return(pid == -1 ? -1 : pstat);
}
__dead void
usage(void)
{
(void)fprintf(stderr,
"usage: apply [-#] [-d] [-a magic] command argument ...\n");
exit(1);
}
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