Function zremrangeGenericCommand

app/redis-6.2.6/src/t_zset.c:1891–1996

Implements ZREMRANGEBYRANK, ZREMRANGEBYSCORE, ZREMRANGEBYLEX commands. */

/* Implements ZREMRANGEBYRANK, ZREMRANGEBYSCORE, ZREMRANGEBYLEX commands. */
void zremrangeGenericCommand(client *c, zrange_type rangetype) {
    robj *key = c->argv[1];
    robj *zobj;
    int keyremoved = 0;
    unsigned long deleted = 0;
    zrangespec range;
    zlexrangespec lexrange;
    long start, end, llen;
    char *notify_type = NULL;

    /* Step 1: Parse the range. */
    if (rangetype == ZRANGE_RANK) {
        notify_type = "zremrangebyrank";
        if ((getLongFromObjectOrReply(c,c->argv[2],&start,NULL) != C_OK) ||
            (getLongFromObjectOrReply(c,c->argv[3],&end,NULL) != C_OK))
            return;
    } else if (rangetype == ZRANGE_SCORE) {
        notify_type = "zremrangebyscore";
        if (zslParseRange(c->argv[2],c->argv[3],&range) != C_OK) {
            addReplyError(c,"min or max is not a float");
            return;
        }
    } else if (rangetype == ZRANGE_LEX) {
        notify_type = "zremrangebylex";
        if (zslParseLexRange(c->argv[2],c->argv[3],&lexrange) != C_OK) {
            addReplyError(c,"min or max not valid string range item");
            return;
        }
    } else {
        serverPanic("unknown rangetype %d", (int)rangetype);
    }

    /* Step 2: Lookup & range sanity checks if needed. */
    if ((zobj = lookupKeyWriteOrReply(c,key,shared.czero)) == NULL ||
        checkType(c,zobj,OBJ_ZSET)) goto cleanup;

    if (rangetype == ZRANGE_RANK) {
        /* Sanitize indexes. */
        llen = zsetLength(zobj);
        if (start < 0) start = llen+start;
        if (end < 0) end = llen+end;
        if (start < 0) start = 0;

        /* Invariant: start >= 0, so this test will be true when end < 0.
         * The range is empty when start > end or start >= length. */
        if (start > end || start >= llen) {
            addReply(c,shared.czero);
            goto cleanup;
        }
        if (end >= llen) end = llen-1;
    }

    /* Step 3: Perform the range deletion operation. */
    if (zobj->encoding == OBJ_ENCODING_ZIPLIST) {
        switch(rangetype) {
        case ZRANGE_AUTO:
        case ZRANGE_RANK:
            zobj->ptr = zzlDeleteRangeByRank(zobj->ptr,start+1,end+1,&deleted);