a414225db1
the given variable name (removing it from the environment, instead of just setting it to a null value). PR: bin/65649 MFC after: 2 weeks
149 lines
4.2 KiB
C
149 lines
4.2 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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int rtrn;
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altpath = NULL;
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want_clear = 0;
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while ((ch = getopt(argc, argv, "-iP:S:u: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 'u':
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if (env_verbosity)
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fprintf(stderr, "#env unset:\t%s\n", optarg);
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rtrn = unsetenv(optarg);
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if (rtrn == -1)
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err(EXIT_FAILURE, "unsetenv %s", optarg);
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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 && (p = strchr(*argv, '=')); ++argv) {
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if (env_verbosity)
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fprintf(stderr, "#env setenv:\t%s\n", *argv);
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*p = '\0';
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rtrn = setenv(*argv, p + 1, 1);
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*p = '=';
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if (rtrn == -1)
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err(EXIT_FAILURE, "setenv %s", *argv);
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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] [-u name]\n"
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" [name=value ...] [utility [argument ...]]\n");
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exit(1);
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}
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