From 7dfe96eebc1cde5d6b23d7879087ea9102943d7d Mon Sep 17 00:00:00 2001
From: Lennart Poettering <lennart@poettering.net>
Date: Fri, 7 Oct 2011 21:00:48 +0200
Subject: hashmap: use different version of DJB's hash algorithm that uses
 shifting instead of multiplication

---
 src/hashmap.c | 8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

(limited to 'src')

diff --git a/src/hashmap.c b/src/hashmap.c
index 0d89da461..95ea45da4 100644
--- a/src/hashmap.c
+++ b/src/hashmap.c
@@ -124,11 +124,13 @@ __attribute__((destructor)) static void cleanup_pool(void) {
 #endif
 
 unsigned string_hash_func(const void *p) {
-        unsigned hash = 0;
-        const char *c;
+        unsigned hash = 5381;
+        const signed char *c;
+
+        /* DJB's hash function */
 
         for (c = p; *c; c++)
-                hash = 31 * hash + (unsigned) *c;
+                hash = (hash << 5) + hash + (unsigned) *c;
 
         return hash;
 }
-- 
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