From 0b4b9dd76429f247a13a165e6841ffc334345e49 Mon Sep 17 00:00:00 2001
From: smatz <smatz@openttd.org>
Date: Fri, 17 Jul 2009 13:54:06 +0000
Subject: [PATCH] (svn r16857) -Fix [FS#3036](r16652): crash when train
 partially in depot crashed

---
 src/saveload/afterload.cpp | 13 ++----------
 src/train.h                |  1 +
 src/train_cmd.cpp          | 42 +++++++++++++++++++++++++-------------
 3 files changed, 31 insertions(+), 25 deletions(-)

diff --git a/src/saveload/afterload.cpp b/src/saveload/afterload.cpp
index a26ef0e6b1..7879af4e7f 100644
--- a/src/saveload/afterload.cpp
+++ b/src/saveload/afterload.cpp
@@ -1708,18 +1708,9 @@ bool AfterLoadGame()
 
 	/* Reserve all tracks trains are currently on. */
 	if (CheckSavegameVersion(101)) {
-		Train *t;
+		const Train *t;
 		FOR_ALL_TRAINS(t) {
-			switch (t->track) {
-				case TRACK_BIT_WORMHOLE:
-					TryReserveRailTrack(t->tile, DiagDirToDiagTrack(GetTunnelBridgeDirection(t->tile)));
-					break;
-				case TRACK_BIT_DEPOT:
-					break;
-				default:
-					TryReserveRailTrack(t->tile, TrackBitsToTrack(t->track));
-					break;
-			}
+			if (t->First() == t) t->ReserveTrackUnderConsist();
 		}
 	}
 
diff --git a/src/train.h b/src/train.h
index aba89633d5..8dca09f965 100644
--- a/src/train.h
+++ b/src/train.h
@@ -134,6 +134,7 @@ struct Train : public SpecializedVehicle<Train, VEH_TRAIN> {
 	TileIndex GetOrderStationLocation(StationID station);
 	bool FindClosestDepot(TileIndex *location, DestinationID *destination, bool *reverse);
 
+	void ReserveTrackUnderConsist() const;
 
 	/**
 	 * enum to handle train subtypes
diff --git a/src/train_cmd.cpp b/src/train_cmd.cpp
index 3a4dde6a9c..3319f34034 100644
--- a/src/train_cmd.cpp
+++ b/src/train_cmd.cpp
@@ -3470,6 +3470,24 @@ static bool TrainMovedChangeSignals(TileIndex tile, DiagDirection dir)
 	return false;
 }
 
+/**
+ * Tries to reserve track under whole train consist
+ */
+void Train::ReserveTrackUnderConsist() const
+{
+	for (const Train *u = this; u != NULL; u = u->Next()) {
+		switch (u->track) {
+			case TRACK_BIT_WORMHOLE:
+				TryReserveRailTrack(u->tile, DiagDirToDiagTrack(GetTunnelBridgeDirection(u->tile)));
+				break;
+			case TRACK_BIT_DEPOT:
+				break;
+			default:
+				TryReserveRailTrack(u->tile, TrackBitsToTrack(u->track));
+				break;
+		}
+	}
+}
 
 static void SetVehicleCrashed(Train *v)
 {
@@ -3532,24 +3550,20 @@ static uint CountPassengersInTrain(const Train *v)
  */
 static uint TrainCrashed(Train *v)
 {
-	/* Try to re-reserve track under already crashed train too */
-	for (const Train *u = v; u != NULL; u = u->Next()) {
-		TrackBits trackbits = u->track;
-		if (trackbits == TRACK_BIT_WORMHOLE) {
-			/* Vehicle is inside a wormhole, v->track contains no useful value then. */
-			trackbits = DiagDirToDiagTrackBits(GetTunnelBridgeDirection(u->tile));
-		}
-		TryReserveRailTrack(u->tile, TrackBitsToTrack(trackbits));
-	}
+	uint num = 0;
 
 	/* do not crash train twice */
-	if (v->vehstatus & VS_CRASHED) return 0;
+	if (!(v->vehstatus & VS_CRASHED)) {
+		/* two drivers + passengers */
+		num = 2 + CountPassengersInTrain(v);
 
-	/* two drivers + passengers */
-	uint num = 2 + CountPassengersInTrain(v);
+		SetVehicleCrashed(v);
+		AI::NewEvent(v->owner, new AIEventVehicleCrashed(v->index, v->tile, AIEventVehicleCrashed::CRASH_TRAIN));
+	}
 
-	SetVehicleCrashed(v);
-	AI::NewEvent(v->owner, new AIEventVehicleCrashed(v->index, v->tile, AIEventVehicleCrashed::CRASH_TRAIN));
+	/* Try to re-reserve track under already crashed train too.
+	 * SetVehicleCrashed() clears the reservation! */
+	v->ReserveTrackUnderConsist();
 
 	return num;
 }