ifupdown: stop emitting annoying/misleading error messages.

Patch by Gabriel Somlo <somlo at cmu.edu>

debianutils/which.c

@@ -3,6 +3,7 @@
  * 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.
  *
@@ -10,74 +11,33 @@
  */
 
 #include "busybox.h"
-#include <string.h>
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <sys/stat.h>
-
-
-static int is_executable_file(char *a, struct stat *b)
-{
-	return (!access(a,X_OK) && !stat(a, b) && S_ISREG(b->st_mode));
-}
 
 int which_main(int argc, char **argv)
 {
-	int status;
-	size_t i, count;
-	char *path_list, *p;
+	int status = EXIT_SUCCESS;
+	char *p;
 
 	if (argc <= 1 || argv[1][0] == '-') {
 		bb_show_usage();
 	}
-	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;
 
+	while (--argc > 0) {
 		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;
+		if (strchr(*argv, '/')) {
+			if (execable_file(*argv)) {
+				puts(*argv);
+				continue;
 			}
 		} 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;
-				}
-				free(buf);
-				p += strlen(p) + 1;
+			p = find_execable(*argv);
+			if (p) {
+				puts(p);
+				free(p);
+				continue;
 			}
 		}
 		status = EXIT_FAILURE;
- next:		/* nothing */;
 	}
+
 	bb_fflush_stdout_and_exit(status);
 }