lib: getdirname fix seqfault on null ptr

In order to be used as drop in replacement for dirname()

If path is a null pointer or points to an empty string,
dirname() shall return a pointer to the string "." .

1 files changed, 1 insertions, 1 deletions

diff --git a/lib/lib.c b/lib/lib.c
index 55b09b85..22b85b06 100644
--- a/lib/lib.c
+++ b/lib/lib.c
@@ -1013,7 +1013,7 @@ char *getdirname(char *name)
   char *s, *ss, *keep;
 
   for (s = name, ss = keep = 0; ; s++) {
-    if (!*s) return keep ? xstrndup(name, keep-name) : xstrdup(".");
+    if (!s || !*s) return keep ? xstrndup(name, keep-name) : xstrdup(".");
     if (*s != '/') keep = ss;
     else if (s == name) keep = ss = s+1;
     else if (s[-1] != '/') ss = s;