Function stralgoLCS

src/t_string.cpp:732–963

STRALGO [IDX] [LEN] [MINMATCHLEN ] [WITHMATCHLEN] * STRINGS | KEYS */

 *     STRINGS <string> <string> | KEYS <keya> <keyb>
 */
void stralgoLCS(client *c) {
    uint32_t i, j;
    long long minmatchlen = 0;
    const char *a = NULL, *b = NULL;
    int getlen = 0, getidx = 0, withmatchlen = 0;
    robj_roptr obja = nullptr, objb = nullptr;
    uint32_t arraylen = 0;  /* Number of ranges emitted in the array. */
    int computelcs;

    for (j = 2; j < (uint32_t)c->argc; j++) {
        char *opt = szFromObj(c->argv[j]);
        int moreargs = (c->argc-1) - j;

        if (!strcasecmp(opt,"IDX")) {
            getidx = 1;
        } else if (!strcasecmp(opt,"LEN")) {
            getlen = 1;
        } else if (!strcasecmp(opt,"WITHMATCHLEN")) {
            withmatchlen = 1;
        } else if (!strcasecmp(opt,"MINMATCHLEN") && moreargs) {
            if (getLongLongFromObjectOrReply(c,c->argv[j+1],&minmatchlen,NULL)
                != C_OK) goto cleanup;
            if (minmatchlen < 0) minmatchlen = 0;
            j++;
        } else if (!strcasecmp(opt,"STRINGS") && moreargs > 1) {
            if (a != NULL) {
                addReplyError(c,"Either use STRINGS or KEYS");
                goto cleanup;
            }
            a = szFromObj(c->argv[j+1]);
            b = szFromObj(c->argv[j+2]);
            j += 2;
        } else if (!strcasecmp(opt,"KEYS") && moreargs > 1) {
            if (a != NULL) {
                addReplyError(c,"Either use STRINGS or KEYS");
                goto cleanup;
            }
            obja = lookupKeyRead(c->db,c->argv[j+1]);
            objb = lookupKeyRead(c->db,c->argv[j+2]);
            if ((obja && obja->type != OBJ_STRING) ||
                (objb && objb->type != OBJ_STRING))
            {
                addReplyError(c,
                    "The specified keys must contain string values");
                /* Don't cleanup the objects, we need to do that
                 * only after calling getDecodedObject(). */
                obja = NULL;
                objb = NULL;
                goto cleanup;
            }
            obja = obja ? getDecodedObject(obja) : createStringObject("",0);
            objb = objb ? getDecodedObject(objb) : createStringObject("",0);
            a = szFromObj(obja);
            b = szFromObj(objb);
            j += 2;
        } else {
            addReplyErrorObject(c,shared.syntaxerr);
            goto cleanup;