1 /* $OpenBSD: printenv.c,v 1.8 2015/10/09 01:37:08 deraadt Exp $ */
2
3 /*
4 * Copyright (c) 1987 Regents of the University of California.
5 * 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 <stdio.h>
33 #include <string.h>
34 #include <stdlib.h>
35 #include <unistd.h>
36 #include <err.h>
37
38 /*
39 * printenv
40 *
41 * Bill Joy, UCB
42 * February, 1979
43 */
44 int
main(int argc,char * argv[])45 main(int argc, char *argv[])
46 {
47 extern char **environ;
48 char *cp, **ep;
49 int len;
50
51 if (pledge("stdio", NULL) == -1)
52 err(1, "pledge");
53
54 if (argc < 2) {
55 for (ep = environ; *ep; ep++)
56 puts(*ep);
57 exit(0);
58 }
59 len = strlen(*++argv);
60 for (ep = environ; *ep; ep++)
61 if (!strncmp(*ep, *argv, len)) {
62 cp = *ep + len;
63 if (!*cp || *cp == '=') {
64 puts(*cp ? cp + 1 : cp);
65 exit(0);
66 }
67 }
68 exit(1);
69 }
70