Redis CLIENT SETNAME

void clientCommand(redisClient *c) {
    if (!strcasecmp(c->argv[1]->ptr,"setname") && c->argc == 3) {
        int j, len = sdslen(c->argv[2]->ptr);
        char *p = c->argv[2]->ptr;

        /* Setting the client name to an empty string actually removes
         * the current name. */
        if (len == 0) {
            if (c->name) decrRefCount(c->name);
            c->name = NULL;
            addReply(c,shared.ok);
            return;
        }

        /* Otherwise check if the charset is ok. We need to do this otherwise
         * CLIENT LIST format will break. You should always be able to
         * split by space to get the different fields. */
        for (j = 0; j < len; j++) {
            if (p[j] < '!' || p[j] > '~') { /* ASCII is assumed. */
                addReplyError(c,
                    "Client names cannot contain spaces, "
                    "newlines or special characters.");
                return;
            }
        }
        if (c->name) decrRefCount(c->name);
        c->name = c->argv[2];
        incrRefCount(c->name);
        addReply(c,shared.ok);
    }
}