From 05433adb6d09f0514b983e631e3a8b334c6f1957 Mon Sep 17 00:00:00 2001
From: yexo <yexo@openttd.org>
Date: Wed, 2 Sep 2009 12:48:23 +0000
Subject: (svn r17378) -Fix [NoAI]: Several AITile::* functions didn't check
 whether their parameters were valid

---
 src/ai/api/ai_tile.cpp | 12 ++++++++++++
 1 file changed, 12 insertions(+)

(limited to 'src/ai')

diff --git a/src/ai/api/ai_tile.cpp b/src/ai/api/ai_tile.cpp
index c0d1b59e0..35eed526b 100644
--- 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));
 }
 
-- 
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