1 file changed, 9 insertions, 10 deletions

diff --git a/source/cache.c b/source/cache.c
index aff0f4d..105ecfe 100644
--- a/source/cache.c
+++ b/source/cache.c
@@ -21,6 +21,12 @@
 #endif
 
 #define CACHE_BUFSIZE (1024 * 4)
+/* Crude implementation of 32-bit FNV-1 hash algorithm,
+ * see http://www.isthe.com/chongo/tech/comp/fnv/ for details
+ * about the magic numbers.
+ */
+#define FNV_OFFSET 0x811c9dc5
+#define FNV_PRIME  0x01000193
 
 struct cache_slot {
 	const char *key;
@@ -63,7 +69,7 @@ static int open_slot(struct cache_slot *slot)
 		bufkeylen = bufz - slot->buf;
 
 	if (slot->key)
-		slot->match = bufkeylen == slot->keylen &&
+		slot->match = bufkeylen >= 0 && (size_t)bufkeylen == slot->keylen &&
 		    !memcmp(slot->key, slot->buf, bufkeylen + 1);
 
 	return 0;
@@ -246,14 +252,7 @@ static int fill_slot(struct cache_slot *slot)
 	return 0;
 }
 
-/* Crude implementation of 32-bit FNV-1 hash algorithm,
- * see http://www.isthe.com/chongo/tech/comp/fnv/ for details
- * about the magic numbers.
- */
-#define FNV_OFFSET 0x811c9dc5
-#define FNV_PRIME  0x01000193
-
-unsigned long hash_str(const char *str)
+unsigned long cache_hash_str(const char *str)
 {
 	unsigned long h = FNV_OFFSET;
 	unsigned char *s = (unsigned char *)str;
@@ -379,7 +378,7 @@ int cache_process(int size, const char *path, const char *key, int ttl,
 	}
 	if (!key)
 		key = "";
-	hash = hash_str(key) % size;
+	hash = cache_hash_str(key) % size;
 	strbuf_addstr(&filename, path);
 	strbuf_ensure_end(&filename, '/');
 	for (i = 0; i < 8; i++) {