* env implementation for busybox
*
* Copyright (c) 1988, 1993, 1994
- * The Regents of the University of California. All rights reserved.
+ * The Regents of the University of California. All rights reserved.
*
- * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
+ * 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>
*/
-
-/* BB_AUDIT SUSv3 compliant */
-/* http://www.opengroup.org/onlinepubs/007904975/utilities/env.html */
-
/* 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
* - GNU long option support
* - use xfunc_error_retval
*/
+//config:config ENV
+//config: bool "env (3.8 kb)"
+//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.
-#include <getopt.h> /* struct option */
-extern char **environ;
+//applet:IF_ENV(APPLET_NOEXEC(env, env, BB_DIR_USR_BIN, BB_SUID_DROP, env))
-#include "libbb.h"
+//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"
-#if ENABLE_FEATURE_ENV_LONG_OPTIONS
-static const struct option env_long_options[] = {
- { "ignore-environment", 0, NULL, 'i' },
- { "unset", 1, NULL, 'u' },
- { 0, 0, 0, 0 }
-};
-#endif
+#include "libbb.h"
-int env_main(int argc, char** argv);
-int env_main(int argc, char** argv)
+int env_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int env_main(int argc UNUSED_PARAM, char **argv)
{
- /* cleanenv was static - why? */
- char *cleanenv[1];
- char **ep;
- unsigned opt;
+ unsigned opts;
llist_t *unset_env = NULL;
- opt_complementary = "u::";
-#if ENABLE_FEATURE_ENV_LONG_OPTIONS
- applet_long_options = env_long_options;
-#endif
- opt = getopt32(argc, argv, "+iu:", &unset_env);
+ opts = getopt32long(argv, "+iu:*",
+ "ignore-environment\0" No_argument "i"
+ "unset\0" Required_argument "u"
+ , &unset_env
+ );
argv += optind;
- if (*argv && LONE_DASH(argv[0])) {
- opt |= 1;
+ if (argv[0] && LONE_DASH(argv[0])) {
+ opts |= 1;
++argv;
}
- if (opt & 1) {
- cleanenv[0] = NULL;
- environ = cleanenv;
- } else if (opt & 2) {
- while (unset_env) {
- unsetenv(unset_env->data);
- unset_env = unset_env->link;
- }
+ 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)) {
++argv;
}
- if (*argv) {
- BB_EXECVP(*argv, argv);
- /* SUSv3-mandated exit codes. */
- xfunc_error_retval = (errno == ENOENT) ? 127 : 126;
- bb_perror_msg_and_die("%s", *argv);
+ if (argv[0]) {
+ BB_EXECVP_or_die(argv);
}
- for (ep = environ; *ep; ep++) {
- puts(*ep);
+ if (environ) { /* clearenv() may set environ == NULL! */
+ char **ep;
+ for (ep = environ; *ep; ep++) {
+ puts(*ep);
+ }
}
- fflush_stdout_and_exit(0);
+ fflush_stdout_and_exit(EXIT_SUCCESS);
}
/*
* 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>
+ * 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
+ * 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
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
-
-
projects / oweals / busybox.git / blobdiff