SDS: changes to unify Redis SDS with antirez/sds repo.

src/networking.c

@@ -33,6 +33,13 @@
 
 static void setProtocolError(redisClient *c, int pos);
 
+/* Return the size consumed from the allocator, for the specified SDS string,
+ * including internal fragmentation. This function is used in order to compute
+ * the client output buffer size. */
+size_t sdsZmallocSize(sds s) {
+    void *sh = sdsAllocPtr(s);
+    return zmalloc_size(sh);
+}
 
 /* Return the amount of memory used by the sds string at object->ptr
  * for a string object. */