(svn r5822) - NewGRF: add support for callback 31, vehicle start/stop check. This allows a set to disallow a vehicle from being started, i.e. to not be able to leave the depot. This is almost a partner to callback 1D.

1 files changed, 10 insertions, 0 deletions

diff --git a/aircraft_cmd.c b/aircraft_cmd.c
index 3136865e5..4493940ed 100644
--- a/aircraft_cmd.c
+++ b/aircraft_cmd.c
@@ -22,6 +22,7 @@
 #include "table/sprites.h"
 #include "newgrf_engine.h"
 #include "newgrf_callbacks.h"
+#include "newgrf_text.h"
 
 static bool AirportMove(Vehicle *v, const AirportFTAClass *Airport);
 static bool AirportSetBlocks(Vehicle *v, AirportFTA *current_pos, const AirportFTAClass *Airport);
@@ -420,6 +421,7 @@ static void DoDeleteAircraft(Vehicle *v)
 int32 CmdSellAircraft(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 {
 	Vehicle *v;
+	uint16 callback;
 
 	if (!IsVehicleIndex(p1)) return CMD_ERROR;
 
@@ -430,6 +432,14 @@ int32 CmdSellAircraft(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 
 	SET_EXPENSES_TYPE(EXPENSES_NEW_VEHICLES);
 
+	/* Check if this aircraft can be started/stopped. The callback will fail or
+	 * return 0xFF if it can. */
+	callback = GetVehicleCallback(CBID_VEHICLE_START_STOP_CHECK, 0, 0, v->engine_type, v);
+	if (callback != CALLBACK_FAILED && callback != 0xFF) {
+		StringID error = GetGRFStringID(GetEngineGRFID(v->engine_type), 0xD000 + callback);
+		return_cmd_error(error);
+	}
+
 	if (flags & DC_EXEC) {
 		// Invalidate depot
 		InvalidateWindow(WC_VEHICLE_DEPOT, v->tile);