GCC Code Coverage Report
Directory: ./ Exec Total Coverage
File: usr.bin/apply/apply.c Lines: 0 97 0.0 %
Date: 2017-11-13 Branches: 0 80 0.0 %

Line Branch Exec Source
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/*	$OpenBSD: apply.c,v 1.27 2015/10/10 17:48:34 deraadt Exp $	*/
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/*	$NetBSD: apply.c,v 1.3 1995/03/25 03:38:23 glass 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/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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__dead	void	usage(void);
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static	int	mysystem(const char *);
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int
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main(int argc, char *argv[])
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{
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	int ch, clen, debug, i, l, magic, n, nargs, rval;
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	char *c, *c2, *cmd, *p, *q;
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	size_t len;
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	if (pledge("stdio proc exec flock rpath cpath wpath", NULL) == -1)
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		err(1, "pledge");
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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(1,
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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(1,
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				    "only one -# argument may be specified.");
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			nargs = ch - '0';
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			break;
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		default:
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			usage();
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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 &&
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		    isdigit((unsigned char)p[1]) && 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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	 * 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 (n == 0) {
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		len = sizeof("exec ") - 1 +
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		    strlen(argv[0]) + 9 * (sizeof(" %1") - 1) + 1;
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		if ((cmd = malloc(len)) == NULL)
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			err(1, NULL);
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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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		l = snprintf(cmd, len, "exec %s", argv[0]);
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		if (l >= len || l == -1)
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			errx(1, "error building exec string");
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		len -= l;
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		p = cmd + l;
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		for (i = 1; i <= nargs; i++) {
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			l = snprintf(p, len, " %c%d", magic, i);
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			if (l >= len || l == -1)
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				errx(1, "error numbering arguments");
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			len -= l;
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			p += l;
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		}
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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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		if (asprintf(&cmd, "exec %s", argv[0]) == -1)
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			err(1, NULL);
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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(1, NULL);
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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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			if ((c2 = realloc(c, l)) == NULL)
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				err(1, NULL);
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			c = c2;
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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 &&
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			    isdigit((unsigned char)p[1]) && p[1] != '0') {
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				strlcpy(q, argv[(++p)[0] - '0'], c + clen - q);
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				q += strlen(q);
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			} else
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				*q++ = *p;
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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 (mysystem(c))
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			rval = 1;
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	}
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	if (argc != 1)
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		errx(1, "expecting additional argument%s after \"%s\"",
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		    (nargs - argc) ? "s" : "", argv[argc - 1]);
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	exit(rval);
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}
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/*
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 * mysystem --
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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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mysystem(const char *command)
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{
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	static const char *name, *shell;
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	pid_t pid;
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	int pstat;
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	sigset_t mask, omask;
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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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	sigemptyset(&mask);
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	sigaddset(&mask, SIGCHLD);
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	sigprocmask(SIG_BLOCK, &mask, &omask);
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	switch(pid = fork()) {
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	case -1:			/* error */
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		err(1, "fork");
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	case 0:				/* child */
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		sigprocmask(SIG_SETMASK, &omask, NULL);
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		execl(shell, name, "-c", command, (char *)NULL);
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		err(1, "%s", shell);
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	}
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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, &pstat, 0);
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	sigprocmask(SIG_SETMASK, &omask, NULL);
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	(void)signal(SIGINT, intsave);
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	(void)signal(SIGQUIT, quitsave);
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	return(pid == -1 ? -1 : pstat);
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}
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__dead void
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usage(void)
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{
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	(void)fprintf(stderr,
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	    "usage: apply [-#] [-d] [-a magic] command argument ...\n");
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	exit(1);
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}