(svn r1834) - Fix: NPF does not check the owner of its target, busses try to enter other players' depots. TODO

- Add: asserts to find the v->u.rail.track == 0 problem.
- Add: IsValidDepot(), IsValidTown(), IsValidSign(), IsValidVehicle(), IsValidStation()
- Add: GetTileOwner(), IsTileOwner()
- Codechange: Replaced IsShipDepotTile(), IsTrainDepotTile(), IsRoadDepotTile() by IsTileDepotType().
- Codechange: typedeffed the MAP_OWNERS as Owner. Should be used as variable type.
- Codechange: Replaced a few uint by TileIndex.

1 files changed, 8 insertions, 0 deletions

diff --git a/signs.h b/signs.h
index 1d19206c5..dc8c65785 100644
--- a/signs.h
+++ b/signs.h
@@ -18,6 +18,14 @@ typedef struct SignStruct {
 extern MemoryPool _sign_pool;
 
 /**
+ * Check if a Sign really exists.
+ */
+static inline bool IsValidSign(SignStruct* ss)
+{
+	return ss->str != 0;
+}
+
+/**
  * Get the pointer to the sign with index 'index'
  */
 static inline SignStruct *GetSign(uint index)