busybox/coreutils/env.c

/* 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
 */

/* This is a NOEXEC applet. Be very careful! */

#include "libbb.h"

#if ENABLE_FEATURE_ENV_LONG_OPTIONS
static const char env_longopts[] ALIGN1 =
	"ignore-environment\0" No_argument       "i"
	"unset\0"              Required_argument "u"
	;
#endif

int env_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int env_main(int argc UNUSED_PARAM, char **argv)
{
	/* cleanenv was static - why? */
	char *cleanenv[1];
	char **ep;
	unsigned opt;
	llist_t *unset_env = NULL;

	opt_complementary = "u::";
#if ENABLE_FEATURE_ENV_LONG_OPTIONS
	applet_long_options = env_longopts;
#endif
	opt = getopt32(argv, "+iu:", &unset_env);
	argv += optind;
	if (*argv && LONE_DASH(argv[0])) {
		opt |= 1;
		++argv;
	}
	if (opt & 1) {
		cleanenv[0] = NULL;
		environ = cleanenv;
	} else {
		while (unset_env) {
			unsetenv(llist_pop(&unset_env));
		}
	}

	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_simple_perror_msg_and_die(*argv);
	}

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

	fflush_stdout_and_exit(EXIT_SUCCESS);
}

/*
 * 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.
 */
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
37	static const char env_longopts[] ALIGN1 =
38	"ignore-environment\0" No_argument "i"
39	"unset\0" Required_argument "u"
40	;
41	#endif
42
43	int env_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
44	int env_main(int argc UNUSED_PARAM, char **argv)
45	{
46	/* cleanenv was static - why? */
47	char *cleanenv[1];
48	char **ep;
49	unsigned opt;
50	llist_t *unset_env = NULL;
51
52	opt_complementary = "u::";
53	#if ENABLE_FEATURE_ENV_LONG_OPTIONS
54	applet_long_options = env_longopts;
55	#endif
56	opt = getopt32(argv, "+iu:", &unset_env);
57	argv += optind;
58	if (*argv && LONE_DASH(argv[0])) {
59	opt \|= 1;
60	++argv;
61	}
62	if (opt & 1) {
63	cleanenv[0] = NULL;
64	environ = cleanenv;
65	} else {
66	while (unset_env) {
67	unsetenv(llist_pop(&unset_env));
68	}
69	}
70
71	while (argv && (strchr(argv, '=') != NULL)) {
72	if (putenv(*argv) < 0) {
73	bb_perror_msg_and_die("putenv");
74	}
75	++argv;
76	}
77
78	if (*argv) {
79	BB_EXECVP(*argv, argv);
80	/* SUSv3-mandated exit codes. */
81	xfunc_error_retval = (errno == ENOENT) ? 127 : 126;
82	bb_simple_perror_msg_and_die(*argv);
83	}
84
85	for (ep = environ; *ep; ep++) {
86	puts(*ep);
87	}
88
89	fflush_stdout_and_exit(EXIT_SUCCESS);
90	}
91
92	/*
93	* Copyright (c) 1988, 1993, 1994
94	* The Regents of the University of California. All rights reserved.
95	*
96	* Redistribution and use in source and binary forms, with or without
97	* modification, are permitted provided that the following conditions
98	* are met:
99	* 1. Redistributions of source code must retain the above copyright
100	* notice, this list of conditions and the following disclaimer.
101	* 2. Redistributions in binary form must reproduce the above copyright
102	* notice, this list of conditions and the following disclaimer in the
103	* documentation and/or other materials provided with the distribution.
104	*
105	* 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
106	* ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
107	*
108	* 4. Neither the name of the University nor the names of its contributors
109	* may be used to endorse or promote products derived from this software
110	* without specific prior written permission.
111	*
112	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
113	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
114	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
115	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
116	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
117	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
118	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
119	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
120	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
121	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
122	* SUCH DAMAGE.
123	*/