1 files changed, 42 insertions, 29 deletions

diff --git a/debianutils/which.c b/debianutils/which.c
index 999dded36..deb036aa0 100644
--- a/debianutils/which.c
+++ b/debianutils/which.c
@@ -4,36 +4,23 @@
  *
  * Copyright (C) 1999-2004 by Erik Andersen <andersen@codepoet.org>
  *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program; if not, write to the Free Software
- * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ * Licensed under the GPL v2, see the file LICENSE in this tarball.
  *
  * Based on which from debianutils
  */
 
-
 #include <string.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <unistd.h>
-
+#include <sys/stat.h>
 #include "busybox.h"
 
-
 extern int which_main(int argc, char **argv)
 {
+        int status = EXIT_SUCCESS;
+        size_t i, count;
         char *path_list;
-        int i, count=1, status = EXIT_SUCCESS;
 
         if (argc <= 1 || **(argv + 1) == '-') {
                 bb_show_usage();
@@ -42,10 +29,33 @@ extern int which_main(int argc, char **argv)
 
         path_list = getenv("PATH");
         if (path_list != NULL) {
-                for (i=strlen(path_list); i > 0; i--) {
-                        if (path_list[i]==':') {
-                                path_list[i]=0;
+                size_t path_len = bb_strlen(path_list);
+                char *new_list = NULL;
+                count = 1;
+
+                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 {
@@ -54,28 +64,31 @@ extern int which_main(int argc, char **argv)
         }
 
         while (argc-- > 0) {
+                struct stat stat_b;
                 char *buf;
                 char *path_n;
                 char found = 0;
-                argv++;
+#define is_executable_file(a, b) (!access(a,X_OK) && !stat(a, &b) && \
+                S_ISREG(b.st_mode))
 
-                /*
-                 * Check if we were given the full path, first.
-                 * Otherwise see if the file exists in our $PATH.
-                 */
+                argv++;
                 path_n = path_list;
                 buf = *argv;
-                if (access(buf, X_OK) == 0) {
+
+                /* 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 (access(buf, X_OK) == 0) {
+                                if (is_executable_file(buf, stat_b)) {
                                         found = 1;
                                         break;
                                 }
                                 free(buf);
-                                path_n += (strlen(path_n) + 1);
+                                path_n += (bb_strlen(path_n) + 1);
                         }
                 }
                 if (found) {
@@ -84,7 +97,7 @@ extern int which_main(int argc, char **argv)
                         status = EXIT_FAILURE;
                 }
         }
-        return status;
+        bb_fflush_stdout_and_exit(status);
 }
 
 /*