* 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, 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 <string.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <sys/stat.h>
-#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"
-int which_main(int argc, char **argv)
+#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;
- size_t i, count;
- char *path_list;
+ char *path;
+ char *p;
+
+ opt_complementary = "-1"; /* at least one argument */
+ IF_DESKTOP(opt =) getopt32(argv, "a");
+ argv += optind;
- if (argc <= 1 || **(argv + 1) == '-') {
- 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) {
- size_t path_len = strlen(path_list);
- char *new_list = NULL;
- count = 1;
+ 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;
- for (i = 0; i <= path_len; i++) {
- char *this_i = &path_list[i];
- if (*this_i == ':') {
- /* ^::[^:] == \.: */
- if (!i && (*(this_i + 1) == ':')) {
- *this_i = '.';
- continue;
- }
- *this_i = 0;
- count++;
- /* ^:[^:] == \.0 and [^:]::[^:] == 0\.0 and [^:]:$ == 0\.0 */
- if (!i || (*(this_i + 1) == ':') || (i == path_len-1)) {
- new_list = xrealloc(new_list, path_len += 1);
- if (i) {
- memmove(&new_list[i+2], &path_list[i+1], path_len-i);
- new_list[i+1] = '.';
- memmove(new_list, path_list, i);
- } else {
- memmove(&new_list[i+1], &path_list[i], path_len-i);
- new_list[i] = '.';
+ 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;
}
- path_list = new_list;
}
}
+ free(path2);
}
- } else {
- path_list = "/bin\0/sbin\0/usr/bin\0/usr/sbin\0/usr/local/bin";
- count = 5;
- }
-
- while (argc-- > 0) {
- struct stat stat_b;
- char *buf;
- char *path_n;
- char found = 0;
-#define is_executable_file(a, b) (!access(a,X_OK) && !stat(a, &b) && \
- S_ISREG(b.st_mode))
-
- argv++;
- path_n = path_list;
- buf = *argv;
-
- /* if filename is either absolute or contains slashes,
- * stat it */
- if (strchr(buf, '/') != NULL && is_executable_file(buf, stat_b)) {
- found = 1;
- } else {
- /* Couldn't access file and file doesn't contain slashes */
- for (i = 0; i < count; i++) {
- buf = concat_path_file(path_n, *argv);
- if (is_executable_file(buf, stat_b)) {
- found = 1;
- break;
- }
- free(buf);
- path_n += (strlen(path_n) + 1);
+#else
+/* Just ignoring -a */
+ if (strchr(*argv, '/')) {
+ if (execable_file(*argv)) {
+ puts(*argv);
+ continue;
}
- }
- if (found) {
- puts(buf);
} else {
- status = EXIT_FAILURE;
+ char *path2 = xstrdup(path);
+ char *tmp = path2;
+ p = find_execable(*argv, &tmp);
+ free(path2);
+ if (p) {
+ puts(p);
+ free(p);
+ continue;
+ }
}
- }
- bb_fflush_stdout_and_exit(status);
+ status = EXIT_FAILURE;
+#endif
+ } while (*(++argv) != NULL);
+
+ fflush_stdout_and_exit(status);
}