/* 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>
*
* Licensed under GPLv2 or later, see file LICENSE in this source tree.
- *
- * Based on which from debianutils
*/
+//config:config WHICH
+//config: bool "which (3.7 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))
+
+//kbuild:lib-$(CONFIG_WHICH) += which.o
+
+//usage:#define which_trivial_usage
+//usage: "[COMMAND]..."
+//usage:#define which_full_usage "\n\n"
+//usage: "Locate a COMMAND"
+//usage:
+//usage:#define which_example_usage
+//usage: "$ which login\n"
+//usage: "/bin/login\n"
#include "libbb.h"
int which_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
int which_main(int argc UNUSED_PARAM, char **argv)
{
- IF_DESKTOP(int opt;)
- int status = EXIT_SUCCESS;
- char *path;
- char *p;
+ 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)];
- opt_complementary = "-1"; /* at least one argument */
- IF_DESKTOP(opt =) getopt32(argv, "a");
- argv += optind;
+ 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);
- /* This matches what is seen on e.g. ubuntu.
- * "which" there is a shell script. */
- path = getenv("PATH");
- if (!path) {
- path = (char*)bb_PATH_root_path;
- putenv(path);
- path += 5; /* skip "PATH=" */
- }
+ getopt32(argv, "^" "a" "\0" "-1"/*at least one arg*/);
+ argv += optind;
do {
-#if ENABLE_DESKTOP
-/* Much bloat just to support -a */
- if (strchr(*argv, '/')) {
- if (execable_file(*argv)) {
- puts(*argv);
- continue;
- }
- status = EXIT_FAILURE;
- } else {
- char *path2 = xstrdup(path);
- char *tmp = path2;
+ int missing = 1;
- p = find_execable(*argv, &tmp);
- if (!p)
- status = EXIT_FAILURE;
- else {
- print:
- puts(p);
- free(p);
- if (opt) {
- /* -a: show matches in all PATH components */
- if (tmp) {
- p = find_execable(*argv, &tmp);
- if (p)
- goto print;
- }
- }
- }
- free(path2);
- }
-#else
-/* Just ignoring -a */
+ /* If file contains a slash don't use PATH */
if (strchr(*argv, '/')) {
- if (execable_file(*argv)) {
+ if (file_is_executable(*argv)) {
+ missing = 0;
puts(*argv);
- continue;
}
} else {
- char *path2 = xstrdup(path);
- char *tmp = path2;
- p = find_execable(*argv, &tmp);
- free(path2);
- if (p) {
+ 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);
- continue;
+ if (!option_mask32) /* -a not set */
+ break;
}
}
- status = EXIT_FAILURE;
-#endif
- } while (*(++argv) != NULL);
+ status |= missing;
+ } while (*++argv);
- fflush_stdout_and_exit(status);
+ return status;
}