[dowster]

Код:

At the top: #define INVALID_DOOR -1

stock GetNextEmptyDoorSlot()
{
    for(new i=0; i<MAX_DOORS; i++)
    {
        if(DoorInfo[i][dTaken] == 0)
        {
            return i;
        }
    }
    return INVALID_DOOR;
}

Edit: Grr, beat by mere seconds.