hash_sdbm: return 0 if passed NULL

Signed-off-by: Dan McGee <dpmcgee@gmail.com>

1 files changed, 2 insertions, 0 deletions

diff --git a/util.c b/util.c
index d2ffc28..8ae295c 100644
--- a/util.c
+++ b/util.c
@@ -79,6 +79,8 @@ ssize_t xwrite(int fd, const void *buf, size_t len)
 unsigned long hash_sdbm(const char *str)
 {
 	unsigned long hash = 0;
+	if(!str)
+		return hash;
 	int c;
 	while((c = *str++))
 		hash = c + (hash << 6) + (hash << 16) - hash;