usr.bin/printenv/printenv.c

/*-
 * Copyright (c) 1987, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 4. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1987, 1993\n\
        The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#if 0
#ifndef lint
static char sccsid[] = "@(#)printenv.c  8.2 (Berkeley) 5/4/95";
#endif /* not lint */
#endif

#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");

#include <sys/types.h>

#include <capsicum_helpers.h>
#include <err.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>

void    usage(void);
extern char **environ;

/*
 * printenv
 *
 * Bill Joy, UCB
 * February, 1979
 */
int
main(int argc, char *argv[])
{
        char *cp, **ep;
        size_t len;
        int ch;

        if (caph_limit_stdio() < 0 || (cap_enter() < 0 && errno != ENOSYS))
                err(1, "capsicum");

        while ((ch = getopt(argc, argv, "")) != -1)
                switch(ch) {
                case '?':
                default:
                        usage();
                }
        argc -= optind;
        argv += optind;

        if (argc == 0) {
                for (ep = environ; *ep; ep++)
                        (void)printf("%s\n", *ep);
                exit(0);
        }
        len = strlen(*argv);
        for (ep = environ; *ep; ep++)
                if (!memcmp(*ep, *argv, len)) {
                        cp = *ep + len;
                        if (*cp == '=') {
                                (void)printf("%s\n", cp + 1);
                                exit(0);
                        }
                }
        exit(1);
}

void
usage(void)
{
        (void)fprintf(stderr, "usage: printenv [name]\n");
        exit(1);
}
1	/*-
2	* Copyright (c) 1987, 1993
3	* The Regents of the University of California. All rights reserved.
4	*
5	* Redistribution and use in source and binary forms, with or without
6	* modification, are permitted provided that the following conditions
7	* are met:
8	* 1. Redistributions of source code must retain the above copyright
9	* notice, this list of conditions and the following disclaimer.
10	* 2. Redistributions in binary form must reproduce the above copyright
11	* notice, this list of conditions and the following disclaimer in the
12	* documentation and/or other materials provided with the distribution.
13	* 4. Neither the name of the University nor the names of its contributors
14	* may be used to endorse or promote products derived from this software
15	* without specific prior written permission.
16	*
17	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27	* SUCH DAMAGE.
28	*/
29
30	#ifndef lint
31	static const char copyright[] =
32	"@(#) Copyright (c) 1987, 1993\n\
33	The Regents of the University of California. All rights reserved.\n";
34	#endif /* not lint */
35
36	#if 0
37	#ifndef lint
38	static char sccsid[] = "@(#)printenv.c 8.2 (Berkeley) 5/4/95";
39	#endif /* not lint */
40	#endif
41
42	#include <sys/cdefs.h>
43	__FBSDID("$FreeBSD$");
44
45	#include <sys/types.h>
46
47	#include <capsicum_helpers.h>
48	#include <err.h>
49	#include <stdlib.h>
50	#include <stdio.h>
51	#include <string.h>
52	#include <unistd.h>
53
54	void usage(void);
55	extern char **environ;
56
57	/*
58	* printenv
59	*
60	* Bill Joy, UCB
61	* February, 1979
62	*/
63	int
64	main(int argc, char *argv[])
65	{
66	char cp, *ep;
67	size_t len;
68	int ch;
69
70	if (caph_limit_stdio() < 0 \|\| (cap_enter() < 0 && errno != ENOSYS))
71	err(1, "capsicum");
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 == '=') {
92	(void)printf("%s\n", cp + 1);
93	exit(0);
94	}
95	}
96	exit(1);
97	}
98
99	void
100	usage(void)
101	{
102	(void)fprintf(stderr, "usage: printenv [name]\n");
103	exit(1);
104	}