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-rw-r--r--libbb/dirname.c60
1 files changed, 37 insertions, 23 deletions
diff --git a/libbb/dirname.c b/libbb/dirname.c
index df9a49d..8129873 100644
--- a/libbb/dirname.c
+++ b/libbb/dirname.c
@@ -1,8 +1,8 @@
/* vi: set sw=4 ts=4: */
/*
- * Mini dirname function.
+ * dirname implementation for busybox (for libc's missing one)
*
- * Copyright (C) 2001 Matt Kraai.
+ * Copyright (C) 2003 Manuel Novoa III <mjn3@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
@@ -17,39 +17,53 @@
* 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
+ *
+ */
+
+/* Note: The previous busybox implementation did not handle NULL path
+ * and also moved a pointer before path, which is not portable in C.
+ * So I replaced it with my uClibc version.
*/
#include <string.h>
#include "libbb.h"
-#if defined __UCLIBC__ || __GNU_LIBRARY___ < 5
-
-/* Return a string containing the path name of the parent
- * directory of PATH. */
+#if __GNU_LIBRARY__ < 5
+extern
char *dirname(char *path)
{
- char *s;
-
- /* Go to the end of the string. */
- s = path + strlen(path) - 1;
-
- /* Strip off trailing /s (unless it is also the leading /). */
- while (path < s && s[0] == '/')
- s--;
+ static const char null_or_empty_or_noslash[] = ".";
+ register char *s;
+ register char *last;
+ char *first;
- /* Strip the last component. */
- while (path <= s && s[0] != '/')
- s--;
+ last = s = path;
- while (path < s && s[0] == '/')
- s--;
+ if (s != NULL) {
- if (s < path)
- return ".";
+ LOOP:
+ while (*s && (*s != '/')) ++s;
+ first = s;
+ while (*s == '/') ++s;
+ if (*s) {
+ last = first;
+ goto LOOP;
+ }
- s[1] = '\0';
- return path;
+ if (last == path) {
+ if (*last != '/') {
+ goto DOT;
+ }
+ if ((*++last == '/') && (last[1] == 0)) {
+ ++last;
+ }
+ }
+ *last = 0;
+ return path;
+ }
+ DOT:
+ return (char *) null_or_empty_or_noslash;
}
#endif