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 #ifndef lint
33 static const char copyright[] =
34 "@(#) Copyright (c) 1987, 1993\n\
35 The Regents of the University of California. All rights reserved.\n";
36 #endif /* not lint */
37
38 #if 0
39 #ifndef lint
40 static char sccsid[] = "@(#)printenv.c 8.2 (Berkeley) 5/4/95";
41 #endif /* not lint */
42 #endif
43
44 #include <sys/cdefs.h>
45 __FBSDID("$FreeBSD: stable/12/usr.bin/printenv/printenv.c 335395 2018-06-19 23:43:14Z oshogbo $");
46
47 #include <sys/types.h>
48
49 #include <capsicum_helpers.h>
50 #include <err.h>
51 #include <stdlib.h>
52 #include <stdio.h>
53 #include <string.h>
54 #include <unistd.h>
55
56 void usage(void);
57 extern char **environ;
58
59 /*
60 * printenv
61 *
62 * Bill Joy, UCB
63 * February, 1979
64 */
65 int
main(int argc,char * argv[])66 main(int argc, char *argv[])
67 {
68 char *cp, **ep;
69 size_t len;
70 int ch;
71
72 if (caph_limit_stdio() < 0 || caph_enter() < 0)
73 err(1, "capsicum");
74
75 while ((ch = getopt(argc, argv, "")) != -1)
76 switch(ch) {
77 case '?':
78 default:
79 usage();
80 }
81 argc -= optind;
82 argv += optind;
83
84 if (argc == 0) {
85 for (ep = environ; *ep; ep++)
86 (void)printf("%s\n", *ep);
87 exit(0);
88 }
89 len = strlen(*argv);
90 for (ep = environ; *ep; ep++)
91 if (!memcmp(*ep, *argv, len)) {
92 cp = *ep + len;
93 if (*cp == '=') {
94 (void)printf("%s\n", cp + 1);
95 exit(0);
96 }
97 }
98 exit(1);
99 }
100
101 void
usage(void)102 usage(void)
103 {
104 (void)fprintf(stderr, "usage: printenv [name]\n");
105 exit(1);
106 }
107