add help text

[oweals/busybox.git] / debianutils / which.c

diff --git a/debianutils/which.c b/debianutils/which.c
index 583d9461368fe589f4b34ecab5560e170e0960c5..15fd598b782f7076ab59dbf27730518affaf3d0c 100644 (file)
--- a/debianutils/which.c
+++ b/debianutils/which.c
@@ -3,81 +3,97 @@
  * 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);
 }