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 * 3. 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 * @(#)env.c 8.3 (Berkeley) 4/2/94
32 * $FreeBSD: head/usr.bin/env/env.c 326025 2017-11-20 19:49:47Z pfg $
33 */
34
35 #include <err.h>
36 #include <errno.h>
37 #include <stdio.h>
38 #include <string.h>
39 #include <stdlib.h>
40 #include <unistd.h>
41
42 #include "envopts.h"
43
44 extern char **environ;
45
46 int env_verbosity;
47
48 static void usage(void);
49
50 int
main(int argc,char ** argv)51 main(int argc, char **argv)
52 {
53 char *altpath, **ep, *p, **parg;
54 char *cleanenv[1];
55 int ch, want_clear;
56 int rtrn;
57
58 altpath = NULL;
59 want_clear = 0;
60 while ((ch = getopt(argc, argv, "iP:S:u:v-")) != -1)
61 switch(ch) {
62 case '-':
63 case 'i':
64 want_clear = 1;
65 break;
66 case 'P':
67 altpath = strdup(optarg);
68 break;
69 case 'S':
70 /*
71 * The -S option, for "split string on spaces, with
72 * support for some simple substitutions"...
73 */
74 split_spaces(optarg, &optind, &argc, &argv);
75 break;
76 case 'u':
77 if (env_verbosity)
78 fprintf(stderr, "#env unset:\t%s\n", optarg);
79 rtrn = unsetenv(optarg);
80 if (rtrn == -1)
81 err(EXIT_FAILURE, "unsetenv %s", optarg);
82 break;
83 case 'v':
84 env_verbosity++;
85 if (env_verbosity > 1)
86 fprintf(stderr, "#env verbosity now at %d\n",
87 env_verbosity);
88 break;
89 case '?':
90 default:
91 usage();
92 }
93 if (want_clear) {
94 environ = cleanenv;
95 cleanenv[0] = NULL;
96 if (env_verbosity)
97 fprintf(stderr, "#env clearing environ\n");
98 }
99 for (argv += optind; *argv && (p = strchr(*argv, '=')); ++argv) {
100 if (env_verbosity)
101 fprintf(stderr, "#env setenv:\t%s\n", *argv);
102 *p = '\0';
103 rtrn = setenv(*argv, p + 1, 1);
104 *p = '=';
105 if (rtrn == -1)
106 err(EXIT_FAILURE, "setenv %s", *argv);
107 }
108 if (*argv) {
109 if (altpath)
110 search_paths(altpath, argv);
111 if (env_verbosity) {
112 fprintf(stderr, "#env executing:\t%s\n", *argv);
113 for (parg = argv, argc = 0; *parg; parg++, argc++)
114 fprintf(stderr, "#env arg[%d]=\t'%s'\n",
115 argc, *parg);
116 if (env_verbosity > 1)
117 sleep(1);
118 }
119 execvp(*argv, argv);
120 err(errno == ENOENT ? 127 : 126, "%s", *argv);
121 }
122 for (ep = environ; *ep; ep++)
123 printf("%s\n", *ep);
124 exit(0);
125 }
126
127 static void
usage(void)128 usage(void)
129 {
130 fprintf(stderr,
131 "usage: env [-iv] [-P utilpath] [-S string] [-u name]\n"
132 " [name=value ...] [utility [argument ...]]\n");
133 exit(1);
134 }
135