+/* vi: set sw=4 ts=4: */
/*
* printenv implementation for busybox
*
* Copyright (C) 2005 by Erik Andersen <andersen@codepoet.org>
* Copyright (C) 2005 by Mike Frysinger <vapier@gentoo.org>
*
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
- *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//config:config PRINTENV
+//config: bool "printenv (1 kb)"
+//config: default y
+//config: help
+//config: printenv is used to print all or part of environment.
+
+//applet:IF_PRINTENV(APPLET_NOFORK(printenv, printenv, BB_DIR_BIN, BB_SUID_DROP, printenv))
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
+//kbuild:lib-$(CONFIG_PRINTENV) += printenv.o
-int printenv_main(int argc, char **argv)
+//usage:#define printenv_trivial_usage
+//usage: "[VARIABLE]..."
+//usage:#define printenv_full_usage "\n\n"
+//usage: "Print environment VARIABLEs.\n"
+//usage: "If no VARIABLE specified, print all."
+
+#include "libbb.h"
+
+/* This is a NOFORK applet. Be very careful! */
+
+int printenv_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int printenv_main(int argc UNUSED_PARAM, char **argv)
{
- extern char **environ;
- int e = 0;
+ int exit_code = EXIT_SUCCESS;
/* no variables specified, show whole env */
- if (argc == 1)
- while (environ[e])
- puts(environ[e++]);
-
- /* search for specified variables and print them out if found */
- else {
- int i;
- size_t l;
+ if (!argv[1]) {
+ char **e = environ;
+
+ /* environ can be NULL! (for example, after clearenv())
+ * Check for that:
+ */
+ if (e)
+ while (*e)
+ puts(*e++);
+ } else {
+ /* search for specified variables and print them out if found */
char *arg, *env;
- for (i=1; (arg = argv[i]); ++i)
- for (; (env = environ[e]); ++e) {
- l = strlen(arg);
- if (!strncmp(env, arg, l) && env[l] == '=')
- puts(env + l + 1);
- }
+ while ((arg = *++argv) != NULL) {
+ env = getenv(arg);
+ if (env)
+ puts(env);
+ else
+ exit_code = EXIT_FAILURE;
+ }
}
- exit(EXIT_SUCCESS);
+ fflush_stdout_and_exit(exit_code);
}