/*
* Which implementation for busybox
*
- * Copyright (C) 1999-2003 by Erik Andersen <andersen@codepoet.org>
+ * 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
*/
-/* getopt not needed */
#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)
{
- char *path_list, *path_n;
- struct stat filestat;
- int i, count=1, found, status = EXIT_SUCCESS;
+ int status = EXIT_SUCCESS;
+ size_t i, count;
+ char *path_list;
- if (argc <= 1 || **(argv + 1) == '-')
+ if (argc <= 1 || **(argv + 1) == '-') {
bb_show_usage();
+ }
argc--;
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 {
path_list = "/bin\0/sbin\0/usr/bin\0/usr/sbin\0/usr/local/bin";
count = 5;
}
- while(argc-- > 0) {
- path_n = path_list;
+ 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++;
- found = 0;
- for (i = 0; i < count; i++) {
- char *buf;
- buf = concat_path_file(path_n, *argv);
- if (stat (buf, &filestat) == 0
- && filestat.st_mode & S_IXUSR)
- {
- puts(buf);
- found = 1;
- break;
+ 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 += (bb_strlen(path_n) + 1);
}
- free(buf);
- path_n += (strlen(path_n) + 1);
}
- if (!found)
+ if (found) {
+ puts(buf);
+ } else {
status = EXIT_FAILURE;
+ }
}
- return status;
+ bb_fflush_stdout_and_exit(status);
}
/*