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
33static 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
40static char sccsid[] = "@(#)printenv.c	8.2 (Berkeley) 5/4/95";
41#endif /* not lint */
42#endif
43
44#include <sys/cdefs.h>
45__FBSDID("$FreeBSD$");
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
56void	usage(void);
57extern char **environ;
58
59/*
60 * printenv
61 *
62 * Bill Joy, UCB
63 * February, 1979
64 */
65int
66main(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
101void
102usage(void)
103{
104	(void)fprintf(stderr, "usage: printenv [name]\n");
105	exit(1);
106}
107