From 7dbf620812fed85479915e5f56bc5e0ce5e58c1c Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Mon, 16 Jan 2012 10:03:38 +0100
Subject: [PATCH] sds.c no longe pre-allocate more than 1MB of free space
 ahead. This fixes issue #252.

---
 src/sds.c | 6 +++++-
 src/sds.h | 2 ++
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/sds.c b/src/sds.c
index b6c2aaf3e..5dc12bf95 100644
--- a/src/sds.c
+++ b/src/sds.c
@@ -116,7 +116,11 @@ sds sdsMakeRoomFor(sds s, size_t addlen) {
     if (free >= addlen) return s;
     len = sdslen(s);
     sh = (void*) (s-(sizeof(struct sdshdr)));
-    newlen = (len+addlen)*2;
+    newlen = (len+addlen);
+    if (newlen < SDS_MAX_PREALLOC)
+        newlen *= 2;
+    else
+        newlen += SDS_MAX_PREALLOC;
     newsh = zrealloc(sh, sizeof(struct sdshdr)+newlen+1);
 #ifdef SDS_ABORT_ON_OOM
     if (newsh == NULL) sdsOomAbort();
diff --git a/src/sds.h b/src/sds.h
index ee336d1de..b00551b41 100644
--- a/src/sds.h
+++ b/src/sds.h
@@ -31,6 +31,8 @@
 #ifndef __SDS_H
 #define __SDS_H
 
+#define SDS_MAX_PREALLOC (1024*1024)
+
 #include <sys/types.h>
 #include <stdarg.h>