busybox/coreutils/env.c
Denys Vlasenko f560422fa0 Big cleanup in config help and description
Redundant help texts (one which only repeats the description)
are deleted.

Descriptions and help texts are trimmed.

Some config options are moved, even across menus.

No config option _names_ are changed.

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
2017-01-10 14:58:54 +01:00

144 lines
4.6 KiB
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 source tree.
*
* Original copyright notice is retained at the end of this file.
*
* Modified for BusyBox by Erik Andersen <andersen@codepoet.org>
*/
/* 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
*/
//config:config ENV
//config: bool "env"
//config: default y
//config: help
//config: env is used to set an environment variable and run
//config: a command; without options it displays the current
//config: environment.
//config:
//config:config FEATURE_ENV_LONG_OPTIONS
//config: bool "Enable long options"
//config: default y
//config: depends on ENV && LONG_OPTS
//applet:IF_ENV(APPLET_NOEXEC(env, env, BB_DIR_USR_BIN, BB_SUID_DROP, env))
//kbuild:lib-$(CONFIG_ENV) += env.o
/* BB_AUDIT SUSv3 compliant */
/* http://www.opengroup.org/onlinepubs/007904975/utilities/env.html */
//usage:#define env_trivial_usage
//usage: "[-iu] [-] [name=value]... [PROG ARGS]"
//usage:#define env_full_usage "\n\n"
//usage: "Print the current environment or run PROG after setting up\n"
//usage: "the specified environment\n"
//usage: "\n -, -i Start with an empty environment"
//usage: "\n -u Remove variable from the environment"
#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;
#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[0]) {
BB_EXECVP_or_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.
*/