From f6a501001c18867d08b2ce222d177b8cf6c62a3a Mon Sep 17 00:00:00 2001
From: Pieter Noordhuis <pcnoordhuis@gmail.com>
Date: Wed, 19 Jan 2011 18:01:01 +0100
Subject: [PATCH] Discard consumed part of buffer less often

---
 hiredis.c | 13 ++++---------
 1 file changed, 4 insertions(+), 9 deletions(-)

diff --git a/hiredis.c b/hiredis.c
index ac6dc67..1751366 100644
--- a/hiredis.c
+++ b/hiredis.c
@@ -538,15 +538,10 @@ int redisReplyReaderGetReply(void *reader, void **reply) {
         if (processItem(r) < 0)
             break;
 
-    /* Discard the consumed part of the buffer. */
-    if (r->pos > 0) {
-        if (r->pos == r->len) {
-            /* sdsrange has a quirck on this edge case. */
-            sdsfree(r->buf);
-            r->buf = sdsempty();
-        } else {
-            r->buf = sdsrange(r->buf,r->pos,r->len);
-        }
+    /* Discard part of the buffer when we've consumed at least 1k, to avoid
+     * doing unnecessary calls to memmove() in sds.c. */
+    if (r->pos >= 1024) {
+        r->buf = sdsrange(r->buf,r->pos,r->len);
         r->pos = 0;
         r->len = sdslen(r->buf);
     }