Canonicalize dirname(3) behavior.

1 files changed, 6 insertions, 4 deletions

diff --git a/libbb/dirname.c b/libbb/dirname.c
index 5f839945d..87db1f24f 100644
--- a/libbb/dirname.c
+++ b/libbb/dirname.c
@@ -22,7 +22,8 @@
 #include <string.h>
 #include "libbb.h"
 
-/* Return a string on the heap containing the directory component of PATH.  */
+/* Return a string containing the path name of the parent
+ * directory of PATH.  */
 
 char *dirname(const char *path)
 {
@@ -43,7 +44,8 @@ char *dirname(const char *path)
                 s--;
 
         if (s < path)
-                return xstrdup (".");
-        else
-                return xstrndup (path, s - path + 1);
+                return ".";
+
+        s[1] = '\0';
+        return path;
 }