/* 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 the GPL v2, see the file LICENSE in this tarball.
- *
- * Based on which from debianutils
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
*/
+//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.
-#include <string.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <sys/stat.h>
-#include "busybox.h"
+//applet:IF_WHICH(APPLET_NOFORK(which, which, BB_DIR_USR_BIN, BB_SUID_DROP, which))
-int which_main(int argc, char **argv)
-{
- int status = EXIT_SUCCESS;
- size_t i, count;
- char *path_list;
+//kbuild:lib-$(CONFIG_WHICH) += which.o
- if (argc <= 1 || **(argv + 1) == '-') {
- bb_show_usage();
- }
- argc--;
+//usage:#define which_trivial_usage
+//usage: "[COMMAND]..."
+//usage:#define which_full_usage "\n\n"
+//usage: "Locate a COMMAND"
+//usage:
+//usage:#define which_example_usage
+//usage: "$ which login\n"
+//usage: "/bin/login\n"
- path_list = getenv("PATH");
- if (path_list != NULL) {
- size_t path_len = strlen(path_list);
- char *new_list = NULL;
- count = 1;
+#include "libbb.h"
- 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] = '.';
- }
- path_list = new_list;
- }
- }
- }
- } else {
- path_list = "/bin\0/sbin\0/usr/bin\0/usr/sbin\0/usr/local/bin";
- count = 5;
- }
+int which_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int which_main(int argc UNUSED_PARAM, char **argv)
+{
+ 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)];
- 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))
+ 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);
- argv++;
- path_n = path_list;
- buf = *argv;
+ getopt32(argv, "^" "a" "\0" "-1"/*at least one arg*/);
+ argv += optind;
- /* if filename is either absolute or contains slashes,
- * stat it */
- if (strchr(buf, '/') != NULL && is_executable_file(buf, stat_b)) {
- found = 1;
+ do {
+ int missing = 1;
+
+ /* If file contains a slash don't use PATH */
+ if (strchr(*argv, '/')) {
+ if (file_is_executable(*argv)) {
+ missing = 0;
+ puts(*argv);
+ }
} 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;
+ 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;
- }
- }
- bb_fflush_stdout_and_exit(status);
+ status |= missing;
+ } while (*++argv);
+
+ return status;
}