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)
{
	unsigned opts;
	llist_t *unset_env = NULL;

	opt_complementary = "u::";
#if ENABLE_FEATURE_ENV_LONG_OPTIONS
	applet_long_options = env_longopts;
#endif
	opts = getopt32(argv, "+iu:", &unset_env);
	argv += optind;
	if (argv[0] && LONE_DASH(argv[0])) {
		opts |= 1;
		++argv;
	}
	if (opts & 1) {
		clearenv();
	}
	while (unset_env) {
		char *var = llist_pop(&unset_env);
		/* This does not handle -uVAR=VAL
		 * (coreutils _sets_ the variable in that case): */
		/*unsetenv(var);*/
		/* This does, but uses somewhan undocumented feature that
		 * putenv("name_without_equal_sign") unsets the variable: */
		putenv(var);
	}

	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);
	}

	if (environ) { /* clearenv() may set environ == NULL! */
		char **ep;
		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	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) {
80	BB_EXECVP(*argv, argv);
81	/* SUSv3-mandated exit codes. */
82	xfunc_error_retval = (errno == ENOENT) ? 127 : 126;
83	bb_simple_perror_msg_and_die(*argv);
84	}
85
86	if (environ) { /* clearenv() may set environ == NULL! */
87	char **ep;
88	for (ep = environ; *ep; ep++) {
89	puts(*ep);
90	}
91	}
92
93	fflush_stdout_and_exit(EXIT_SUCCESS);
94	}
95
96	/*
97	* Copyright (c) 1988, 1993, 1994
98	* The Regents of the University of California. All rights reserved.
99	*
100	* Redistribution and use in source and binary forms, with or without
101	* modification, are permitted provided that the following conditions
102	* are met:
103	* 1. Redistributions of source code must retain the above copyright
104	* notice, this list of conditions and the following disclaimer.
105	* 2. Redistributions in binary form must reproduce the above copyright
106	* notice, this list of conditions and the following disclaimer in the
107	* documentation and/or other materials provided with the distribution.
108	*
109	* 3. <BSD Advertising Clause omitted per the July 22, 1999 licensing change
110	* ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change>
111	*
112	* 4. Neither the name of the University nor the names of its contributors
113	* may be used to endorse or promote products derived from this software
114	* without specific prior written permission.
115	*
116	* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
117	* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
118	* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
119	* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
120	* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
121	* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
122	* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
123	* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
124	* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
125	* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
126	* SUCH DAMAGE.
127	*/