1/* vi: set sw=4 ts=4: */
2/*
3 * env implementation for busybox
4 *
5 * Copyright (c) 1988, 1993, 1994
6 *	The Regents of the University of California.  All rights reserved.
7 *
8 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
9 *
10 * Original copyright notice is retained at the end of this file.
11 *
12 * Modified for BusyBox by Erik Andersen <andersen@codepoet.org>
13 */
14
15/* BB_AUDIT SUSv3 compliant */
16/* http://www.opengroup.org/onlinepubs/007904975/utilities/env.html */
17
18/* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
19 *
20 * Fixed bug involving exit return codes if execvp fails.  Also added
21 * output error checking.
22 */
23
24/*
25 * Modified by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
26 * - correct "-" option usage
27 * - multiple "-u unsetenv" support
28 * - GNU long option support
29 * - use xfunc_error_retval
30 */
31
32/* This is a NOEXEC applet. Be very careful! */
33
34#include "libbb.h"
35
36#if ENABLE_FEATURE_ENV_LONG_OPTIONS
37static const char env_longopts[] ALIGN1 =
38	"ignore-environment\0" No_argument       "i"
39	"unset\0"              Required_argument "u"
40	;
41#endif
42
43int env_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
44int env_main(int argc UNUSED_PARAM, char **argv)
45{
46	unsigned opts;
47	llist_t *unset_env = NULL;
48
49	opt_complementary = "u::";
50#if ENABLE_FEATURE_ENV_LONG_OPTIONS
51	applet_long_options = env_longopts;
52#endif
53	opts = getopt32(argv, "+iu:", &unset_env);
54	argv += optind;
55	if (argv[0] && LONE_DASH(argv[0])) {
56		opts |= 1;
57		++argv;
58	}
59	if (opts & 1) {
60		clearenv();
61	}
62	while (unset_env) {
63		char *var = llist_pop(&unset_env);
64		/* This does not handle -uVAR=VAL
65		 * (coreutils _sets_ the variable in that case): */
66		/*unsetenv(var);*/
67		/* This does, but uses somewhan undocumented feature that
68		 * putenv("name_without_equal_sign") unsets the variable: */
69		putenv(var);
70	}
71
72	while (*argv && (strchr(*argv, '=') != NULL)) {
73		if (putenv(*argv) < 0) {
74			bb_perror_msg_and_die("putenv");
75		}
76		++argv;
77	}
78
79	if (argv[0]) {
80		BB_EXECVP_or_die(argv);
81	}
82
83	if (environ) { /* clearenv() may set environ == NULL! */
84		char **ep;
85		for (ep = environ; *ep; ep++) {
86			puts(*ep);
87		}
88	}
89
90	fflush_stdout_and_exit(EXIT_SUCCESS);
91}
92
93/*
94 * Copyright (c) 1988, 1993, 1994
95 *      The Regents of the University of California.  All rights reserved.
96 *
97 * Redistribution and use in source and binary forms, with or without
98 * modification, are permitted provided that the following conditions
99 * are met:
100 * 1. Redistributions of source code must retain the above copyright
101 *    notice, this list of conditions and the following disclaimer.
102 * 2. Redistributions in binary form must reproduce the above copyright
103 *    notice, this list of conditions and the following disclaimer in the
104 *    documentation and/or other materials provided with the distribution.
105 *
106 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
107 *		ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
108 *
109 * 4. Neither the name of the University nor the names of its contributors
110 *    may be used to endorse or promote products derived from this software
111 *    without specific prior written permission.
112 *
113 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
114 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
115 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
116 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
117 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
118 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
119 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
120 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
121 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
122 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
123 * SUCH DAMAGE.
124 */
125