LXR 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
  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 */
 133