avoid calling strlen() on NULLHEADmaster

1 files changed, 2 insertions, 0 deletions

diff --git a/ls.c b/ls.c
index e38284b..cc98368 100644
--- a/ls.c
+++ b/ls.c
@@ -52,6 +52,8 @@
 #define SIZEWIDTH	(10)
 #define LINKWIDTH	(3)
 
+#define strlen(s) (s ? strlen(s) : 0)
+
 static enum {
 	ALPHA,
 	SIZE,