Function lcsGetKeys

app/redis-6.2.6/src/db.c:1829–1851

LCS ... [KEYS ] ... */

/* LCS ... [KEYS <key1> <key2>] ... */
int lcsGetKeys(struct redisCommand *cmd, robj **argv, int argc, getKeysResult *result) {
    int i;
    int *keys = getKeysPrepareResult(result, 2);
    UNUSED(cmd);

    /* We need to parse the options of the command in order to check for the
     * "KEYS" argument before the "STRINGS" argument. */
    for (i = 1; i < argc; i++) {
        char *arg = argv[i]->ptr;
        int moreargs = (argc-1) - i;

        if (!strcasecmp(arg, "strings")) {
            break;
        } else if (!strcasecmp(arg, "keys") && moreargs >= 2) {
            keys[0] = i+1;
            keys[1] = i+2;
            result->numkeys = 2;
            return result->numkeys;
        }
    }
    result->numkeys = 0;
    return result->numkeys;
}

/* Helper function to extract keys from memory command.
 * MEMORY USAGE <key> */