Function getfreepos

src/Chain/libraries/glua/ltable.cpp:558–565

static Node *getfreepos(Table *t) {
    while (t->lastfree > t->node) {
        t->lastfree--;
        if (ttisnil(gkey(t->lastfree)))
            return t->lastfree;
    }
    return nullptr;  /* could not find a free place */
}