release/src/router/busybox/coreutils/env.c

   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  */