* 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 the GPL v2 or later, see the file LICENSE in this tarball.
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*
* Based on which from debianutils
*/
-#include "busybox.h"
-#include <string.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <sys/stat.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"
-static int is_executable_file(char *a, struct stat *b)
+int which_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int which_main(int argc UNUSED_PARAM, char **argv)
{
- return (!access(a,X_OK) && !stat(a, b) && S_ISREG(b->st_mode));
-}
+ IF_DESKTOP(int opt;)
+ int status = EXIT_SUCCESS;
+ char *path;
+ char *p;
-int which_main(int argc, char **argv)
-{
- int status;
- size_t i, count;
- char *path_list, *p;
+ opt_complementary = "-1"; /* at least one argument */
+ IF_DESKTOP(opt =) getopt32(argv, "a");
+ argv += optind;
- if (argc <= 1 || argv[1][0] == '-') {
- bb_show_usage();
+ /* 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=" */
}
- argc--;
-
- path_list = getenv("PATH");
- if (path_list != NULL) {
- count = 1;
- p = path_list;
- while ((p = strchr(p, ':')) != NULL) {
- *p++ = 0;
- count++;
- }
- } else {
- path_list = "/bin\0/sbin\0/usr/bin\0/usr/sbin\0/usr/local/bin";
- count = 5;
- }
-
- status = EXIT_SUCCESS;
- while (argc-- > 0) {
- struct stat stat_b;
- char *buf;
-
- argv++;
- buf = argv[0];
- /* If filename is either absolute or contains slashes,
- * stat it */
- if (strchr(buf, '/')) {
- if (is_executable_file(buf, &stat_b)) {
- puts(buf);
- goto next;
+ do {
+#if ENABLE_DESKTOP
+/* Much bloat just to support -a */
+ if (strchr(*argv, '/')) {
+ if (execable_file(*argv)) {
+ puts(*argv);
+ continue;
}
+ status = EXIT_FAILURE;
} else {
- /* File doesn't contain slashes */
- p = path_list;
- for (i = 0; i < count; i++) {
- /* Empty component in PATH is treated as . */
- buf = concat_path_file(p[0] ? p : ".", argv[0]);
- if (is_executable_file(buf, &stat_b)) {
- puts(buf);
- free(buf);
- goto next;
+ char *path2 = xstrdup(path);
+ char *tmp = path2;
+
+ 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(buf);
- p += strlen(p) + 1;
+ }
+ free(path2);
+ }
+#else
+/* Just ignoring -a */
+ if (strchr(*argv, '/')) {
+ if (execable_file(*argv)) {
+ puts(*argv);
+ continue;
+ }
+ } else {
+ char *path2 = xstrdup(path);
+ char *tmp = path2;
+ p = find_execable(*argv, &tmp);
+ free(path2);
+ if (p) {
+ puts(p);
+ free(p);
+ continue;
}
}
status = EXIT_FAILURE;
- next: /* nothing */;
- }
- bb_fflush_stdout_and_exit(status);
+#endif
+ } while (*(++argv) != NULL);
+
+ fflush_stdout_and_exit(status);
}