254 lines
6.6 KiB
C
254 lines
6.6 KiB
C
/* $NetBSD: apply.c,v 1.17 2008/03/08 03:35:53 christos Exp $ */
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/*-
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* Copyright (c) 1994
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Jan-Simon Pendry.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)apply.c 8.4 (Berkeley) 4/4/94";
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#else
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__RCSID("$NetBSD: apply.c,v 1.17 2008/03/08 03:35:53 christos Exp $");
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#endif
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#endif /* not lint */
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#include <sys/wait.h>
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#include <ctype.h>
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#include <err.h>
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#include <paths.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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static void usage(void) __dead;
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static int shell_system(const char *);
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int
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main(int argc, char *argv[])
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{
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size_t clen, l;
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int ch, debug, i, magic, n, nargs, rval;
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char *c, *cmd, *p, *q, *nc;
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(void)setprogname(argv[0]); /* for portability */
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debug = 0;
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magic = '%'; /* Default magic char is `%'. */
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nargs = -1;
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while ((ch = getopt(argc, argv, "a:d0123456789")) != -1) {
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switch (ch) {
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case 'a':
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if (optarg[1] != '\0')
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errx(EXIT_FAILURE,
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"illegal magic character specification.");
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magic = optarg[0];
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break;
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case 'd':
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debug = 1;
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break;
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case '0': case '1': case '2': case '3': case '4':
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case '5': case '6': case '7': case '8': case '9':
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if (nargs != -1)
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errx(EXIT_FAILURE,
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"only one -# argument may be specified.");
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nargs = optopt - '0';
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (argc < 2)
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usage();
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/*
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* The command to run is argv[0], and the args are argv[1..].
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* Look for %digit references in the command, remembering the
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* largest one.
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*/
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for (n = 0, p = argv[0]; *p != '\0'; ++p) {
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if (p[0] == magic && isdigit((unsigned char)p[1]) &&
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p[1] != '0') {
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++p;
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if (p[0] - '0' > n)
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n = p[0] - '0';
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}
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}
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/*
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* If there were any %digit references, then use those, otherwise
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* build a new command string with sufficient %digit references at
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* the end to consume (nargs) arguments each time round the loop.
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* Allocate enough space to hold the maximum command.
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*/
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if ((cmd = malloc(sizeof("exec ") - 1 +
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strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1)) == NULL)
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err(EXIT_FAILURE, "malloc");
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if (n == 0) {
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/* If nargs not set, default to a single argument. */
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if (nargs == -1)
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nargs = 1;
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p = cmd;
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p += sprintf(cmd, "exec %s", argv[0]);
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for (i = 1; i <= nargs; i++)
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p += sprintf(p, " %c%d", magic, i);
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/*
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* If nargs set to the special value 0, eat a single
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* argument for each command execution.
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*/
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if (nargs == 0)
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nargs = 1;
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} else {
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(void)sprintf(cmd, "exec %s", argv[0]);
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nargs = n;
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}
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/*
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* Grab some space in which to build the command. Allocate
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* as necessary later, but no reason to build it up slowly
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* for the normal case.
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*/
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if ((c = malloc(clen = 1024)) == NULL)
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err(EXIT_FAILURE, "malloc");
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/*
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* (argc) and (argv) are still offset by one to make it simpler to
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* expand %digit references. At the end of the loop check for (argc)
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* equals 1 means that all the (argv) has been consumed.
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*/
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for (rval = 0; argc > nargs; argc -= nargs, argv += nargs) {
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/*
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* Find a max value for the command length, and ensure
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* there's enough space to build it.
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*/
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for (l = strlen(cmd), i = 0; i < nargs; i++)
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l += strlen(argv[i+1]);
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if (l > clen) {
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nc = realloc(c, l);
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if (nc == NULL)
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err(EXIT_FAILURE, "malloc");
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c = nc;
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clen = l;
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}
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/* Expand command argv references. */
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for (p = cmd, q = c; *p != '\0'; ++p) {
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if (p[0] == magic && isdigit((unsigned char)p[1]) &&
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p[1] != '0')
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q += sprintf(q, "%s", argv[(++p)[0] - '0']);
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else
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*q++ = *p;
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}
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/* Terminate the command string. */
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*q = '\0';
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/* Run the command. */
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if (debug)
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(void)printf("%s\n", c);
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else if (shell_system(c))
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rval = 1;
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}
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if (argc != 1)
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errx(EXIT_FAILURE,
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"expecting additional argument%s after \"%s\"",
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(nargs - argc) ? "s" : "", argv[argc - 1]);
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return rval;
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}
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/*
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* shell_system --
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* Private version of system(3). Use the user's SHELL environment
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* variable as the shell to execute.
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*/
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static int
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shell_system(const char *command)
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{
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static const char *name, *shell;
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int status;
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int omask;
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pid_t pid;
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sig_t intsave, quitsave;
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if (shell == NULL) {
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if ((shell = getenv("SHELL")) == NULL)
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shell = _PATH_BSHELL;
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if ((name = strrchr(shell, '/')) == NULL)
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name = shell;
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else
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++name;
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}
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if (!command) /* just checking... */
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return(1);
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omask = sigblock(sigmask(SIGCHLD));
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switch (pid = vfork()) {
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case -1: /* error */
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err(EXIT_FAILURE, "vfork");
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/*NOTREACHED*/
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case 0: /* child */
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(void)sigsetmask(omask);
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(void)execl(shell, name, "-c", command, NULL);
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warn("%s", shell);
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_exit(1);
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/*NOTREACHED*/
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default: /* parent */
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intsave = signal(SIGINT, SIG_IGN);
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quitsave = signal(SIGQUIT, SIG_IGN);
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pid = waitpid(pid, &status, 0);
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(void)sigsetmask(omask);
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(void)signal(SIGINT, intsave);
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(void)signal(SIGQUIT, quitsave);
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return pid == -1 ? -1 : status;
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}
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/*NOTREACHED*/
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}
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__dead
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static void
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usage(void)
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{
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(void)fprintf(stderr,
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"usage: %s [-a magic] [-0123456789] command arguments ...\n",
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getprogname());
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exit(1);
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}
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