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(svn r20391) -Fix [FS#3993]: Prevent buying more vehicles than allowed.
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@ -1321,8 +1321,28 @@ UnitID FreeUnitIDGenerator::NextID()
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return this->curid;
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}
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/**
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* Get an unused unit number for a vehicle (if allowed).
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* @param type Type of vehicle
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* @return A unused unit number for the given type of vehicle if it is allowed to build one, else \c UINT16_MAX.
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*/
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UnitID GetFreeUnitNumber(VehicleType type)
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{
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/* Check whether it is allowed to build another vehicle. */
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uint max_veh;
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switch (type) {
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case VEH_TRAIN: max_veh = _settings_game.vehicle.max_trains; break;
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case VEH_ROAD: max_veh = _settings_game.vehicle.max_roadveh; break;
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case VEH_SHIP: max_veh = _settings_game.vehicle.max_ships; break;
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case VEH_AIRCRAFT: max_veh = _settings_game.vehicle.max_aircraft; break;
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default: NOT_REACHED();
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}
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uint amounts[4];
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CountCompanyVehicles(_current_company, amounts);
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assert((uint)type < lengthof(amounts));
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if (amounts[type] >= max_veh) return UINT16_MAX; // Currently already at the limit, no room to make a new one.
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FreeUnitIDGenerator gen(type, _current_company);
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return gen.NextID();
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