From 5ba7c672da004302fb9ffbb2cc4d47d5fd8dfa6a Mon Sep 17 00:00:00 2001
From: smatz <smatz@openttd.org>
Date: Sat, 3 Jan 2009 16:27:52 +0000
Subject: (svn r14808) -Fix (r1): coal mine subsidence could wrap around map
 edges

---
 src/disaster_cmd.cpp | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/disaster_cmd.cpp b/src/disaster_cmd.cpp
index 37a2a3bb0..ccdd230ca 100644
--- a/src/disaster_cmd.cpp
+++ b/src/disaster_cmd.cpp
@@ -983,11 +983,11 @@ static void Disaster_CoalMine_Init()
 				{
 					TileIndex tile = i->xy;
 					TileIndexDiff step = TileOffsByDiagDir((DiagDirection)GB(Random(), 0, 2));
-					uint n;
 
-					for (n = 0; n < 30; n++) {
+					for (uint n = 0; n < 30; n++) {
 						DisasterClearSquare(tile);
-						tile = TILE_MASK(tile + step);
+						tile += step;
+						if (!IsValidTile(tile)) break;
 					}
 				}
 				return;
-- 
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