/* vi: set sw=4 ts=4: */
/*
- * Which implementation for busybox
- *
* Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
+ * Copyright (C) 2006 Gabriel Somlo <somlo at cmu.edu>
*
- * 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
- *
- * Based on which from debianutils
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//config:config WHICH
+//config: bool "which (3.8 kb)"
+//config: default y
+//config: help
+//config: which is used to find programs in your PATH and
+//config: print out their pathnames.
+//applet:IF_WHICH(APPLET_NOFORK(which, which, BB_DIR_USR_BIN, BB_SUID_DROP, which))
-#include <string.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
+//kbuild:lib-$(CONFIG_WHICH) += which.o
-#include "busybox.h"
+//usage:#define which_trivial_usage
+//usage: "[COMMAND]..."
+//usage:#define which_full_usage "\n\n"
+//usage: "Locate a COMMAND"
+//usage:
+//usage:#define which_example_usage
+//usage: "$ which login\n"
+//usage: "/bin/login\n"
+#include "libbb.h"
-extern int which_main(int argc, char **argv)
+int which_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int which_main(int argc UNUSED_PARAM, char **argv)
{
- char *path_list;
- int i, count=1, status = EXIT_SUCCESS;
+ char *env_path;
+ int status = 0;
+ /* This sizeof(): bb_default_root_path is shorter than BB_PATH_ROOT_PATH */
+ char buf[sizeof(BB_PATH_ROOT_PATH)];
- if (argc <= 1 || **(argv + 1) == '-') {
- bb_show_usage();
- }
- argc--;
+ env_path = getenv("PATH");
+ if (!env_path)
+ /* env_path must be writable, and must not alloc, so... */
+ env_path = strcpy(buf, bb_default_root_path);
- path_list = getenv("PATH");
- if (path_list != NULL) {
- for (i=strlen(path_list); i > 0; i--) {
- if (path_list[i]==':') {
- path_list[i]=0;
- count++;
- }
- }
- } else {
- path_list = "/bin\0/sbin\0/usr/bin\0/usr/sbin\0/usr/local/bin";
- count = 5;
- }
+ getopt32(argv, "^" "a" "\0" "-1"/*at least one arg*/);
+ argv += optind;
- while (argc-- > 0) {
- char *buf;
- char *path_n;
- char found = 0;
- argv++;
+ do {
+ int missing = 1;
- /*
- * Check if we were given the full path, first.
- * Otherwise see if the file exists in our $PATH.
- */
- path_n = path_list;
- buf = *argv;
- if (access(buf, X_OK) == 0) {
- found = 1;
+ /* If file contains a slash don't use PATH */
+ if (strchr(*argv, '/')) {
+ if (file_is_executable(*argv)) {
+ missing = 0;
+ puts(*argv);
+ }
} else {
- for (i = 0; i < count; i++) {
- buf = concat_path_file(path_n, *argv);
- if (access(buf, X_OK) == 0) {
- found = 1;
+ char *path;
+ char *p;
+
+ path = env_path;
+ /* NOFORK NB: xmalloc inside find_executable(), must have no allocs above! */
+ while ((p = find_executable(*argv, &path)) != NULL) {
+ missing = 0;
+ puts(p);
+ free(p);
+ if (!option_mask32) /* -a not set */
break;
- }
- free(buf);
- path_n += (strlen(path_n) + 1);
}
}
- if (found) {
- puts(buf);
- } else {
- status = EXIT_FAILURE;
- }
- }
+ status |= missing;
+ } while (*++argv);
+
return status;
}
-
-/*
-Local Variables:
-c-file-style: "linux"
-c-basic-offset: 4
-tab-width: 4
-End:
-*/