blob: 807ef13e9be033b488d2df6ce3c9eb9c7f2bd810
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 |
45 | static const char env_longopts[] ALIGN1 = |
46 | "ignore-environment\0" No_argument "i" |
47 | "unset\0" Required_argument "u" |
48 | ; |
49 | #endif |
50 | |
51 | int env_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
52 | int 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 | */ |
133 |