From 1b7298e66ae002b9011c22d8270436506a9dc9b1 Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Tue, 27 Nov 2018 11:58:55 +0100
Subject: [PATCH] RESP3: addReplyNull() added.

---
 src/networking.c | 8 ++++++++
 src/server.c     | 2 +-
 src/server.h     | 1 +
 3 files changed, 10 insertions(+), 1 deletion(-)

diff --git a/src/networking.c b/src/networking.c
index 6f077be7..bb51619f 100644
--- a/src/networking.c
+++ b/src/networking.c
@@ -603,6 +603,14 @@ void addReplyPushLen(client *c, long length) {
     addReplyAggregateLen(c,length,prefix);
 }
 
+void addReplyNull(client *c) {
+    if (c->resp == 2) {
+        addReplyString(c,"$-1\r\n",5);
+    } else {
+        addReplyString(c,"_\r\n",3);
+    }
+}
+
 /* Create the length prefix of a bulk reply, example: $2234 */
 void addReplyBulkLen(client *c, robj *obj) {
     size_t len;
diff --git a/src/server.c b/src/server.c
index 7d84d39f..5b6a9c4a 100644
--- a/src/server.c
+++ b/src/server.c
@@ -2954,7 +2954,7 @@ int addReplyCommandFlag(client *c, struct redisCommand *cmd, int f, char *reply)
 /* Output the representation of a Redis command. Used by the COMMAND command. */
 void addReplyCommand(client *c, struct redisCommand *cmd) {
     if (!cmd) {
-        addReply(c, shared.nullbulk);
+        addReplyNull(c);
     } else {
         /* We are adding: command name, arg count, flags, first, last, offset */
         addReplyArrayLen(c, 6);
diff --git a/src/server.h b/src/server.h
index 456d11ca..a483e1a6 100644
--- a/src/server.h
+++ b/src/server.h
@@ -1437,6 +1437,7 @@ void acceptHandler(aeEventLoop *el, int fd, void *privdata, int mask);
 void acceptTcpHandler(aeEventLoop *el, int fd, void *privdata, int mask);
 void acceptUnixHandler(aeEventLoop *el, int fd, void *privdata, int mask);
 void readQueryFromClient(aeEventLoop *el, int fd, void *privdata, int mask);
+void addReplyNull(client *c);
 void addReplyString(client *c, const char *s, size_t len);
 void addReplyBulk(client *c, robj *obj);
 void addReplyBulkCString(client *c, const char *s);