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initial implementation of SUBSTR

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antirez 2010-03-03 23:15:52 +01:00
parent 9693e4f0f0
commit 3919155375
2 changed files with 42 additions and 0 deletions
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1
redis-cli.c
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@ -65,6 +65,7 @@ static struct redisCommand cmdTable[] = {
{"set",3,REDIS_CMD_BULK},
{"setnx",3,REDIS_CMD_BULK},
{"append",3,REDIS_CMD_BULK},
{"substr",4,REDIS_CMD_INLINE},
{"del",-2,REDIS_CMD_INLINE},
{"exists",2,REDIS_CMD_INLINE},
{"incr",2,REDIS_CMD_INLINE},

41
redis.c
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@ -659,6 +659,7 @@ static void discardCommand(redisClient *c);
static void blpopCommand(redisClient *c);
static void brpopCommand(redisClient *c);
static void appendCommand(redisClient *c);
static void substrCommand(redisClient *c);
static void zrankCommand(redisClient *c);
/*================================= Globals ================================= */
@ -670,6 +671,7 @@ static struct redisCommand cmdTable[] = {
{"set",setCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,0,0,0},
{"setnx",setnxCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,0,0,0},
{"append",appendCommand,3,REDIS_CMD_BULK|REDIS_CMD_DENYOOM,1,1,1},
{"substr",substrCommand,4,REDIS_CMD_INLINE,1,1,1},
{"del",delCommand,-2,REDIS_CMD_INLINE,0,0,0},
{"exists",existsCommand,2,REDIS_CMD_INLINE,1,1,1},
{"incr",incrCommand,2,REDIS_CMD_INLINE|REDIS_CMD_DENYOOM,1,1,1},
@ -3764,6 +3766,45 @@ static void appendCommand(redisClient *c) {
addReplySds(c,sdscatprintf(sdsempty(),":%lu\r\n",(unsigned long)totlen));
}
static void substrCommand(redisClient *c) {
robj *o;
long start = atoi(c->argv[2]->ptr);
long end = atoi(c->argv[3]->ptr);
o = lookupKeyRead(c->db,c->argv[1]);
if (o == NULL) {
addReply(c,shared.nullbulk);
} else {
if (o->type != REDIS_STRING) {
addReply(c,shared.wrongtypeerr);
} else {
size_t rangelen, strlen = sdslen(o->ptr);
sds range;
/* convert negative indexes */
if (start < 0) start = strlen+start;
if (end < 0) end = strlen+end;
if (start < 0) start = 0;
if (end < 0) end = 0;
/* indexes sanity checks */
if (start > end || (size_t)start >= strlen) {
/* Out of range start or start > end result in null reply */
addReply(c,shared.nullbulk);
return;
}
if ((size_t)end >= strlen) end = strlen-1;
rangelen = (end-start)+1;
/* Return the result */
addReplySds(c,sdscatprintf(sdsempty(),"$%lu\r\n",rangelen));
range = sdsnewlen((char*)o->ptr+start,rangelen);
addReplySds(c,range);
addReply(c,shared.crlf);
}
}
}
/* ========================= Type agnostic commands ========================= */
static void delCommand(redisClient *c) {