void setCommand(client *c) {
    int j;
    robj *expire = NULL;
    int unit = UNIT_SECONDS;
    int flags = OBJ_SET_NO_FLAGS;

    for (j = 3; j < c->argc; j++) {
        char *a = c->argv[j]->ptr;
        robj *next = (j == c->argc-1) ? NULL : c->argv[j+1];

        if ((a[0] == 'n' || a[0] == 'N') &&
            (a[1] == 'x' || a[1] == 'X') && a[2] == '\0' &&
            !(flags & OBJ_SET_XX))
        {
            flags |= OBJ_SET_NX;
        } else if ((a[0] == 'x' || a[0] == 'X') &&
                   (a[1] == 'x' || a[1] == 'X') && a[2] == '\0' &&
                   !(flags & OBJ_SET_NX))
        {
            flags |= OBJ_SET_XX;
        } else if (!strcasecmp(c->argv[j]->ptr,"KEEPTTL") &&
                   !(flags & OBJ_SET_EX) && !(flags & OBJ_SET_PX))
        {
            flags |= OBJ_SET_KEEPTTL;
        } else if ((a[0] == 'e' || a[0] == 'E') &&
                   (a[1] == 'x' || a[1] == 'X') && a[2] == '\0' &&
                   !(flags & OBJ_SET_KEEPTTL) &&
                   !(flags & OBJ_SET_PX) && next)
        {
            flags |= OBJ_SET_EX;
            unit = UNIT_SECONDS;
            expire = next;
            j++;
        } else if ((a[0] == 'p' || a[0] == 'P') &&
                   (a[1] == 'x' || a[1] == 'X') && a[2] == '\0' &&
                   !(flags & OBJ_SET_KEEPTTL) &&
                   !(flags & OBJ_SET_EX) && next)
        {
            flags |= OBJ_SET_PX;
            unit = UNIT_MILLISECONDS;
            expire = next;
            j++;
        } else {
            addReply(c,shared.syntaxerr);
            return;
        }
    }

    c->argv[2] = tryObjectEncoding(c->argv[2]);
    setGenericCommand(c,flags,c->argv[1],c->argv[2],expire,unit,NULL,NULL);
}