1/*	$NetBSD: printenv.c,v 1.6 1997/10/19 12:44:26 lukem Exp $	*/
2
3/*
4 * Copyright (c) 1987, 1993
5 *    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. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#include <sys/cdefs.h>
37#ifndef lint
38__COPYRIGHT("@(#) Copyright (c) 1987, 1993\n\
39      The Regents of the University of California.  All rights reserved.\n");
40#endif /* not lint */
41
42#ifndef lint
43/*static char sccsid[] = "from: @(#)printenv.c	8.2 (Berkeley) 5/4/95";*/
44__RCSID("$NetBSD: printenv.c,v 1.6 1997/10/19 12:44:26 lukem Exp $");
45#endif /* not lint */
46
47#include <sys/types.h>
48
49#include <stdlib.h>
50#include <stdio.h>
51#include <string.h>
52#include <unistd.h>
53
54int	main __P((int, char **));
55void	usage __P((void));
56
57/*
58 * printenv
59 *
60 * Bill Joy, UCB
61 * February, 1979
62 */
63int
64main(argc, argv)
65	int argc;
66	char *argv[];
67{
68	extern char **environ;
69	char *cp, **ep;
70	size_t len;
71	int ch;
72
73	while ((ch = getopt(argc, argv, "")) != -1)
74		switch(ch) {
75		case '?':
76		default:
77			usage();
78		}
79	argc -= optind;
80	argv += optind;
81
82	if (argc == 0) {
83		for (ep = environ; *ep; ep++)
84			(void)printf("%s\n", *ep);
85		exit(0);
86	}
87	len = strlen(*argv);
88	for (ep = environ; *ep; ep++)
89		if (!memcmp(*ep, *argv, len)) {
90			cp = *ep + len;
91			if (!*cp || *cp == '=') {
92				(void)printf("%s\n", *cp ? cp + 1 : cp);
93				exit(0);
94			}
95		}
96	exit(1);
97}
98
99void
100usage()
101{
102	(void)fprintf(stderr, "usage: printenv [name]\n");
103	exit(1);
104}
105