8fbe7ebf7d
apart a string, and supports some text substitutions. This can be used to provide all the flexibility (and more!) that was lost by recent changes to how the kernel parses #!-lines in shell scripts. The '-P' option provides a way to specify an alternate set of directories to use when searching for the 'utility' program to run. This way you can be sure what directories are used for that search, without changing the value of PATH that the user has set. Note that on FreeBSD 6.0, this option is worthless unless the '-S' option is also used. Approved by: re (blanket `env')
138 lines
3.9 KiB
C
138 lines
3.9 KiB
C
/*
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* Copyright (c) 1988, 1993, 1994
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* The Regents of the University of California. All rights reserved.
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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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#ifndef lint
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static const char copyright[] =
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"@(#) Copyright (c) 1988, 1993, 1994\n\
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The Regents of the University of California. All rights reserved.\n";
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#endif /* not lint */
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#if 0
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#ifndef lint
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static char sccsid[] = "@(#)env.c 8.3 (Berkeley) 4/2/94";
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#endif /* not lint */
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#endif
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <err.h>
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#include <errno.h>
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "envopts.h"
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extern char **environ;
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int env_verbosity;
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static void usage(void);
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int
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main(int argc, char **argv)
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{
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char *altpath, **ep, *p, **parg;
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char *cleanenv[1];
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int ch, want_clear;
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altpath = NULL;
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want_clear = 0;
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while ((ch = getopt(argc, argv, "-iP:S:v")) != -1)
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switch(ch) {
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case '-':
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case 'i':
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want_clear = 1;
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break;
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case 'P':
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altpath = strdup(optarg);
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break;
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case 'S':
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/*
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* The -S option, for "split string on spaces, with
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* support for some simple substitutions"...
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*/
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split_spaces(optarg, &optind, &argc, &argv);
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break;
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case 'v':
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env_verbosity++;
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if (env_verbosity > 1)
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fprintf(stderr, "#env verbosity now at %d\n",
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env_verbosity);
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break;
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case '?':
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default:
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usage();
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}
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if (want_clear) {
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environ = cleanenv;
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cleanenv[0] = NULL;
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if (env_verbosity)
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fprintf(stderr, "#env clearing environ\n");
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}
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for (argv += optind; *argv && (**argv != '/') && (p = strchr(*argv,
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'=')); ++argv) {
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if (env_verbosity)
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fprintf(stderr, "#env setenv:\t%s\n", *argv);
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(void)setenv(*argv, ++p, 1);
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}
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if (*argv) {
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if (altpath)
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search_paths(altpath, argv);
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if (env_verbosity) {
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fprintf(stderr, "#env executing:\t%s\n", *argv);
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for (parg = argv, argc = 0; *parg; parg++, argc++)
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fprintf(stderr, "#env arg[%d]=\t'%s'\n",
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argc, *parg);
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if (env_verbosity > 1)
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sleep(1);
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}
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execvp(*argv, argv);
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err(errno == ENOENT ? 127 : 126, "%s", *argv);
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}
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for (ep = environ; *ep; ep++)
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(void)printf("%s\n", *ep);
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exit(0);
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}
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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: env [-iv] [-P utilpath] [-S string] [name=value ...]"
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" [utility [argument ...]]\n");
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exit(1);
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}
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