env.c revision 330897 
1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1988, 1993, 1994
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 4. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#ifndef lint
33static const char copyright[] =
34"@(#) Copyright (c) 1988, 1993, 1994\n\
35	The Regents of the University of California.  All rights reserved.\n";
36#endif /* not lint */
37
38#if 0
39#ifndef lint
40static char sccsid[] = "@(#)env.c	8.3 (Berkeley) 4/2/94";
41#endif /* not lint */
42#endif
43
44#include <sys/cdefs.h>
45__FBSDID("$FreeBSD: stable/11/usr.bin/env/env.c 330897 2018-03-14 03:19:51Z eadler $");
46
47#include <err.h>
48#include <errno.h>
49#include <stdio.h>
50#include <string.h>
51#include <stdlib.h>
52#include <unistd.h>
53
54#include "envopts.h"
55
56extern char **environ;
57
58int	 env_verbosity;
59
60static void usage(void);
61
62int
63main(int argc, char **argv)
64{
65	char *altpath, **ep, *p, **parg;
66	char *cleanenv[1];
67	int ch, want_clear;
68	int rtrn;
69
70	altpath = NULL;
71	want_clear = 0;
72	while ((ch = getopt(argc, argv, "-iP:S:u:v")) != -1)
73		switch(ch) {
74		case '-':
75		case 'i':
76			want_clear = 1;
77			break;
78		case 'P':
79			altpath = strdup(optarg);
80			break;
81		case 'S':
82			/*
83			 * The -S option, for "split string on spaces, with
84			 * support for some simple substitutions"...
85			 */
86			split_spaces(optarg, &optind, &argc, &argv);
87			break;
88		case 'u':
89			if (env_verbosity)
90				fprintf(stderr, "#env unset:\t%s\n", optarg);
91			rtrn = unsetenv(optarg);
92			if (rtrn == -1)
93				err(EXIT_FAILURE, "unsetenv %s", optarg);
94			break;
95		case 'v':
96			env_verbosity++;
97			if (env_verbosity > 1)
98				fprintf(stderr, "#env verbosity now at %d\n",
99				    env_verbosity);
100			break;
101		case '?':
102		default:
103			usage();
104		}
105	if (want_clear) {
106		environ = cleanenv;
107		cleanenv[0] = NULL;
108		if (env_verbosity)
109			fprintf(stderr, "#env clearing environ\n");
110	}
111	for (argv += optind; *argv && (p = strchr(*argv, '=')); ++argv) {
112		if (env_verbosity)
113			fprintf(stderr, "#env setenv:\t%s\n", *argv);
114		*p = '\0';
115		rtrn = setenv(*argv, p + 1, 1);
116		*p = '=';
117		if (rtrn == -1)
118			err(EXIT_FAILURE, "setenv %s", *argv);
119	}
120	if (*argv) {
121		if (altpath)
122			search_paths(altpath, argv);
123		if (env_verbosity) {
124			fprintf(stderr, "#env executing:\t%s\n", *argv);
125			for (parg = argv, argc = 0; *parg; parg++, argc++)
126				fprintf(stderr, "#env    arg[%d]=\t'%s'\n",
127				    argc, *parg);
128			if (env_verbosity > 1)
129				sleep(1);
130		}
131		execvp(*argv, argv);
132		err(errno == ENOENT ? 127 : 126, "%s", *argv);
133	}
134	for (ep = environ; *ep; ep++)
135		(void)printf("%s\n", *ep);
136	exit(0);
137}
138
139static void
140usage(void)
141{
142	(void)fprintf(stderr,
143	    "usage: env [-iv] [-P utilpath] [-S string] [-u name]\n"
144	    "           [name=value ...] [utility [argument ...]]\n");
145	exit(1);
146}
147