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#include <sys/types.h>
33
34#include <capsicum_helpers.h>
35#include <err.h>
36#include <stdlib.h>
37#include <stdio.h>
38#include <string.h>
39#include <unistd.h>
40
41void	usage(void);
42extern char **environ;
43
44/*
45 * printenv
46 *
47 * Bill Joy, UCB
48 * February, 1979
49 */
50int
51main(int argc, char *argv[])
52{
53	char *cp, **ep;
54	size_t len;
55	int ch;
56
57	if (caph_limit_stdio() < 0 || caph_enter() < 0)
58		err(1, "capsicum");
59
60	while ((ch = getopt(argc, argv, "")) != -1)
61		switch(ch) {
62		case '?':
63		default:
64			usage();
65		}
66	argc -= optind;
67	argv += optind;
68
69	if (argc == 0) {
70		for (ep = environ; *ep; ep++)
71			(void)printf("%s\n", *ep);
72		exit(0);
73	}
74	len = strlen(*argv);
75	for (ep = environ; *ep; ep++)
76		if (!memcmp(*ep, *argv, len)) {
77			cp = *ep + len;
78			if (*cp == '=') {
79				(void)printf("%s\n", cp + 1);
80				exit(0);
81			}
82		}
83	exit(1);
84}
85
86void
87usage(void)
88{
89	(void)fprintf(stderr, "usage: printenv [name]\n");
90	exit(1);
91}
92