From 4c7ee0d5848ab12b9d2b18bca62cffcbfac0e885 Mon Sep 17 00:00:00 2001
From: antirez <antirez@gmail.com>
Date: Mon, 13 Jul 2015 18:06:24 +0200
Subject: [PATCH] EXISTS is now variadic.

The new return value is the number of keys existing, among the ones
specified in the command line, counting the same key multiple times if
given multiple times (and if it exists).

See PR #2667.
---
 src/db.c    | 14 +++++++++-----
 src/redis.c |  2 +-
 2 files changed, 10 insertions(+), 6 deletions(-)

diff --git a/src/db.c b/src/db.c
index 36650318a..1493f0a20 100644
--- a/src/db.c
+++ b/src/db.c
@@ -318,13 +318,17 @@ void delCommand(redisClient *c) {
     addReplyLongLong(c,deleted);
 }
 
+/* EXISTS key1 key2 ... key_N.
+ * Return value is the number of keys existing. */
 void existsCommand(redisClient *c) {
-    expireIfNeeded(c->db,c->argv[1]);
-    if (dbExists(c->db,c->argv[1])) {
-        addReply(c, shared.cone);
-    } else {
-        addReply(c, shared.czero);
+    long long count = 0;
+    int j;
+
+    for (j = 1; j < c->argc; j++) {
+        expireIfNeeded(c->db,c->argv[j]);
+        if (dbExists(c->db,c->argv[j])) count++;
     }
+    addReplyLongLong(c,count);
 }
 
 void selectCommand(redisClient *c) {
diff --git a/src/redis.c b/src/redis.c
index 1bcd8375e..656c21ff2 100644
--- a/src/redis.c
+++ b/src/redis.c
@@ -132,7 +132,7 @@ struct redisCommand redisCommandTable[] = {
     {"append",appendCommand,3,"wm",0,NULL,1,1,1,0,0},
     {"strlen",strlenCommand,2,"rF",0,NULL,1,1,1,0,0},
     {"del",delCommand,-2,"w",0,NULL,1,-1,1,0,0},
-    {"exists",existsCommand,2,"rF",0,NULL,1,1,1,0,0},
+    {"exists",existsCommand,-2,"rF",0,NULL,1,-1,1,0,0},
     {"setbit",setbitCommand,4,"wm",0,NULL,1,1,1,0,0},
     {"getbit",getbitCommand,3,"rF",0,NULL,1,1,1,0,0},
     {"setrange",setrangeCommand,4,"wm",0,NULL,1,1,1,0,0},
-- 
GitLab