# HG changeset patch
# User yexo <yexo@openttd.org>
# Date 2009-09-02 12:48:23
# Node ID f6a9a5783c1269226c2b3b6996ad5bc1272e5880
# Parent  8a6c80b73050c8cacd712b5fe01ff37d7b96ea61

(svn r17378) -Fix [NoAI]: Several AITile::* functions didn't check whether their parameters were valid

diff --git a/src/ai/api/ai_tile.cpp b/src/ai/api/ai_tile.cpp
--- a/src/ai/api/ai_tile.cpp
+++ b/src/ai/api/ai_tile.cpp
@@ -95,31 +95,43 @@
 
 /* static */ bool AITile::HasTreeOnTile(TileIndex tile)
 {
+	if (!::IsValidTile(tile)) return false;
+
 	return ::IsTileType(tile, MP_TREES);
 }
 
 /* static */ bool AITile::IsFarmTile(TileIndex tile)
 {
+	if (!::IsValidTile(tile)) return false;
+
 	return (::IsTileType(tile, MP_CLEAR) && ::IsClearGround(tile, CLEAR_FIELDS));
 }
 
 /* static */ bool AITile::IsRockTile(TileIndex tile)
 {
+	if (!::IsValidTile(tile)) return false;
+
 	return (::IsTileType(tile, MP_CLEAR) && ::IsClearGround(tile, CLEAR_ROCKS));
 }
 
 /* static */ bool AITile::IsRoughTile(TileIndex tile)
 {
+	if (!::IsValidTile(tile)) return false;
+
 	return (::IsTileType(tile, MP_CLEAR) && ::IsClearGround(tile, CLEAR_ROUGH));
 }
 
 /* static */ bool AITile::IsSnowTile(TileIndex tile)
 {
+	if (!::IsValidTile(tile)) return false;
+
 	return (::IsTileType(tile, MP_CLEAR) && ::IsClearGround(tile, CLEAR_SNOW));
 }
 
 /* static */ bool AITile::IsDesertTile(TileIndex tile)
 {
+	if (!::IsValidTile(tile)) return false;
+
 	return (::IsTileType(tile, MP_CLEAR) && ::IsClearGround(tile, CLEAR_DESERT));
 }