Function CmdModifyOrder

src/order_cmd.cpp:1172–1454

* Modify an order in the orderlist of a vehicle. * @param flags operation to perform * @param veh ID of the vehicle * @param sel_ord the selected order (if any). If the last order is given, * the order will be inserted before that one * the maximum vehicle order id is 254. * @param mof what data to modify (@see ModifyOrderFlags) * @param data the data to modify

 * @return the cost of this operation or an error
 */
CommandCost CmdModifyOrder(DoCommandFlags flags, VehicleID veh, VehicleOrderID sel_ord, ModifyOrderFlags mof, uint16_t data)
{
	if (mof >= MOF_END) return CMD_ERROR;

	Vehicle *v = Vehicle::GetIfValid(veh);
	if (v == nullptr || !v->IsPrimaryVehicle()) return CMD_ERROR;

	CommandCost ret = CheckOwnership(v->owner);
	if (ret.Failed()) return ret;

	/* Is it a valid order? */
	if (sel_ord >= v->GetNumOrders()) return CMD_ERROR;

	Order *order = v->GetOrder(sel_ord);
	assert(order != nullptr);
	switch (order->GetType()) {
		case OT_GOTO_STATION:
			if (mof != MOF_NON_STOP && mof != MOF_STOP_LOCATION && mof != MOF_UNLOAD && mof != MOF_LOAD) return CMD_ERROR;
			break;

		case OT_GOTO_DEPOT:
			if (mof != MOF_NON_STOP && mof != MOF_DEPOT_ACTION) return CMD_ERROR;
			break;

		case OT_GOTO_WAYPOINT:
			if (mof != MOF_NON_STOP) return CMD_ERROR;
			break;

		case OT_CONDITIONAL:
			if (mof != MOF_COND_VARIABLE && mof != MOF_COND_COMPARATOR && mof != MOF_COND_VALUE && mof != MOF_COND_DESTINATION) return CMD_ERROR;
			break;

		default:
			return CMD_ERROR;
	}

	switch (mof) {
		default: NOT_REACHED();

		case MOF_NON_STOP: {
			if (!v->IsGroundVehicle()) return CMD_ERROR;

			OrderNonStopFlags nonstop_flags = static_cast<OrderNonStopFlags>(data);
			if (nonstop_flags == order->GetNonStopType()) return CMD_ERROR;

			/* Test for invalid flags. */
			nonstop_flags.Reset({OrderNonStopFlag::NoIntermediate, OrderNonStopFlag::NoDestination});
			if (nonstop_flags.Any()) return CMD_ERROR;
			break;
		}

		case MOF_STOP_LOCATION:
			if (v->type != VEH_TRAIN) return CMD_ERROR;
			if (data >= to_underlying(OrderStopLocation::End)) return CMD_ERROR;
			break;

		case MOF_UNLOAD: {
			if (order->GetNonStopType().Test(OrderNonStopFlag::NoDestination)) return CMD_ERROR;