1 /* $OpenBSD: printenv.c,v 1.5 2003/06/10 22:20:49 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 #ifndef lint
33 char copyright[] =
34 "@(#) Copyright (c) 1987 Regents of the University of California.\n\
35 All rights reserved.\n";
36 #endif /* not lint */
37
38 #ifndef lint
39 /*static char sccsid[] = "from: @(#)printenv.c 5.4 (Berkeley) 6/1/90";*/
40 static char rcsid[] = "$OpenBSD: printenv.c,v 1.5 2003/06/10 22:20:49 deraadt Exp $";
41 #endif /* not lint */
42
43 #include <stdio.h>
44 #include <string.h>
45 #include <stdlib.h>
46
47 /*
48 * printenv
49 *
50 * Bill Joy, UCB
51 * February, 1979
52 */
53 int
main(int argc,char * argv[])54 main(int argc, char *argv[])
55 {
56 extern char **environ;
57 char *cp, **ep;
58 int len;
59
60 if (argc < 2) {
61 for (ep = environ; *ep; ep++)
62 puts(*ep);
63 exit(0);
64 }
65 len = strlen(*++argv);
66 for (ep = environ; *ep; ep++)
67 if (!strncmp(*ep, *argv, len)) {
68 cp = *ep + len;
69 if (!*cp || *cp == '=') {
70 puts(*cp ? cp + 1 : cp);
71 exit(0);
72 }
73 }
74 exit(1);
75 }
76