source: branches/3.2/mindi-busybox/coreutils/env.c @ 3232

Last change on this file since 3232 was 3232, checked in by bruno, 5 years ago
  • Update mindi-busybox to 1.21.1
File size: 4.2 KB
Line 
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 source tree.
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//usage:#define env_trivial_usage
35//usage:       "[-iu] [-] [name=value]... [PROG ARGS]"
36//usage:#define env_full_usage "\n\n"
37//usage:       "Print the current environment or run PROG after setting up\n"
38//usage:       "the specified environment\n"
39//usage:     "\n    -, -i   Start with an empty environment"
40//usage:     "\n    -u  Remove variable from the environment"
41
42#include "libbb.h"
43
44#if ENABLE_FEATURE_ENV_LONG_OPTIONS
45static const char env_longopts[] ALIGN1 =
46    "ignore-environment\0" No_argument       "i"
47    "unset\0"              Required_argument "u"
48    ;
49#endif
50
51int env_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
52int env_main(int argc UNUSED_PARAM, char **argv)
53{
54    unsigned opts;
55    llist_t *unset_env = NULL;
56
57    opt_complementary = "u::";
58#if ENABLE_FEATURE_ENV_LONG_OPTIONS
59    applet_long_options = env_longopts;
60#endif
61    opts = getopt32(argv, "+iu:", &unset_env);
62    argv += optind;
63    if (argv[0] && LONE_DASH(argv[0])) {
64        opts |= 1;
65        ++argv;
66    }
67    if (opts & 1) {
68        clearenv();
69    }
70    while (unset_env) {
71        char *var = llist_pop(&unset_env);
72        /* This does not handle -uVAR=VAL
73         * (coreutils _sets_ the variable in that case): */
74        /*unsetenv(var);*/
75        /* This does, but uses somewhan undocumented feature that
76         * putenv("name_without_equal_sign") unsets the variable: */
77        putenv(var);
78    }
79
80    while (*argv && (strchr(*argv, '=') != NULL)) {
81        if (putenv(*argv) < 0) {
82            bb_perror_msg_and_die("putenv");
83        }
84        ++argv;
85    }
86
87    if (argv[0]) {
88        BB_EXECVP_or_die(argv);
89    }
90
91    if (environ) { /* clearenv() may set environ == NULL! */
92        char **ep;
93        for (ep = environ; *ep; ep++) {
94            puts(*ep);
95        }
96    }
97
98    fflush_stdout_and_exit(EXIT_SUCCESS);
99}
100
101/*
102 * Copyright (c) 1988, 1993, 1994
103 *      The Regents of the University of California.  All rights reserved.
104 *
105 * Redistribution and use in source and binary forms, with or without
106 * modification, are permitted provided that the following conditions
107 * are met:
108 * 1. Redistributions of source code must retain the above copyright
109 *    notice, this list of conditions and the following disclaimer.
110 * 2. Redistributions in binary form must reproduce the above copyright
111 *    notice, this list of conditions and the following disclaimer in the
112 *    documentation and/or other materials provided with the distribution.
113 *
114 * 3. BSD Advertising Clause omitted per the July 22, 1999 licensing change
115 *    ftp://ftp.cs.berkeley.edu/pub/4bsd/README.Impt.License.Change
116 *
117 * 4. Neither the name of the University nor the names of its contributors
118 *    may be used to endorse or promote products derived from this software
119 *    without specific prior written permission.
120 *
121 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
122 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
123 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
124 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
125 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
126 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
127 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
128 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
129 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
130 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
131 * SUCH DAMAGE.
132 */
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