(svn r5262) Add symbolic names for the aircraft subtypes. not perfect, but better than raw numbers

1 files changed, 2 insertions, 1 deletions

diff --git a/players.c b/players.c
index 865688f5d..6a72c8c95 100644
--- a/players.c
+++ b/players.c
@@ -738,7 +738,8 @@ int32 CmdReplaceVehicle(TileIndex tile, uint32 flags, uint32 p1, uint32 p2)
 					return CMD_ERROR;
 
 				// make sure that we do not replace a plane with a helicopter or vise versa
-				if (GetEngine(new_engine_type)->type == VEH_Aircraft && HASBIT(AircraftVehInfo(old_engine_type)->subtype, 0) != HASBIT(AircraftVehInfo(new_engine_type)->subtype, 0))
+				if (GetEngine(new_engine_type)->type == VEH_Aircraft &&
+						(AircraftVehInfo(old_engine_type)->subtype & AIR_CTOL) != (AircraftVehInfo(new_engine_type)->subtype & AIR_CTOL))
 					return CMD_ERROR;
 
 				// make sure that the player can actually buy the new engine