1 /*-
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright (c) 1987, 1993
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
32 #include <sys/types.h>
33
34 #include <capsicum_helpers.h>
35 #include <err.h>
36 #include <stdlib.h>
37 #include <stdio.h>
38 #include <string.h>
39 #include <unistd.h>
40
41 void usage(void);
42 extern char **environ;
43
44 /*
45 * printenv
46 *
47 * Bill Joy, UCB
48 * February, 1979
49 */
50 int
main(int argc,char * argv[])51 main(int argc, char *argv[])
52 {
53 char *cp, **ep;
54 size_t len;
55 int ch;
56
57 if (caph_limit_stdio() < 0 || caph_enter() < 0)
58 err(1, "capsicum");
59
60 while ((ch = getopt(argc, argv, "")) != -1)
61 switch(ch) {
62 case '?':
63 default:
64 usage();
65 }
66 argc -= optind;
67 argv += optind;
68
69 if (argc == 0) {
70 for (ep = environ; *ep; ep++)
71 (void)printf("%s\n", *ep);
72 exit(0);
73 }
74 len = strlen(*argv);
75 for (ep = environ; *ep; ep++)
76 if (!memcmp(*ep, *argv, len)) {
77 cp = *ep + len;
78 if (*cp == '=') {
79 (void)printf("%s\n", cp + 1);
80 exit(0);
81 }
82 }
83 exit(1);
84 }
85
86 void
usage(void)87 usage(void)
88 {
89 (void)fprintf(stderr, "usage: printenv [name]\n");
90 exit(1);
91 }
92