summaryrefslogtreecommitdiff
path: root/coreutils/env.c
blob: 7be0c63a531be4155736aeb3e31f8d86e30060b5 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
/* vi: set sw=4 ts=4: */
/*
 * env implementation for busybox
 *
 * Copyright (c) 1988, 1993, 1994
 *	The Regents of the University of California.  All rights reserved.
 *
 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
 *
 * Original copyright notice is retained at the end of this file.
 *
 * Modified for BusyBox by Erik Andersen <andersen@codepoet.org>
 */

/* BB_AUDIT SUSv3 compliant */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/env.html */

/* Mar 16, 2003      Manuel Novoa III   (mjn3@codepoet.org)
 *
 * Fixed bug involving exit return codes if execvp fails.  Also added
 * output error checking.
 */

/*
 * Modified by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
 * - correct "-" option usage
 * - multiple "-u unsetenv" support
 * - GNU long option support
 * - use xfunc_error_retval
 */

#include "busybox.h"
#include <errno.h>
#include <getopt.h> /* struct option */

#if ENABLE_FEATURE_ENV_LONG_OPTIONS
static const struct option env_long_options[] = {
	{ "ignore-environment", 0, NULL, 'i' },
	{ "unset", 1, NULL, 'u' },
	{ 0, 0, 0, 0 }
};
#endif

int env_main(int argc, char** argv);
int env_main(int argc, char** argv)
{
	static char *cleanenv[1] = { NULL };

	char **ep;
	unsigned opt;
	llist_t *unset_env = NULL;
	extern char **environ;

	opt_complementary = "u::";
#if ENABLE_FEATURE_ENV_LONG_OPTIONS
	applet_long_options = env_long_options;
#endif

	opt = getopt32(argc, argv, "+iu:", &unset_env);

	argv += optind;
	if (*argv && LONE_DASH(argv[0])) {
		opt |= 1;
		++argv;
	}

	if (opt & 1)
		environ = cleanenv;
	else if (opt & 2) {
		while (unset_env) {
			unsetenv(unset_env->data);
			unset_env = unset_env->link;
		}
	}

	while (*argv && (strchr(*argv, '=') != NULL)) {
		if (putenv(*argv) < 0) {
			bb_perror_msg_and_die("putenv");
		}
		++argv;
	}

	if (*argv) {
		BB_EXECVP(*argv, argv);
		/* SUSv3-mandated exit codes. */
		xfunc_error_retval = (errno == ENOENT) ? 127 : 126;
		bb_perror_msg_and_die("%s", *argv);
	}

	for (ep = environ; *ep; ep++) {
		puts(*ep);
	}

	fflush_stdout_and_exit(0);
}

/*
 * Copyright (c) 1988, 1993, 1994
 *      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.
 *
 * 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
 *		ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
 *
 * 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.
 */