mo = get_next_map_obj(world, start, &first, size, mo);
exit_err(NULL == mo, world, err);
mo->pos = find_passable_pos(world->map);
mo = get_next_map_obj(world, start, &first, size, mo);
exit_err(NULL == mo, world, err);
mo->pos = find_passable_pos(world->map);