From d4b748e27e9a09ae407ba605453c46071a626e1b Mon Sep 17 00:00:00 2001
From: alberth <alberth@openttd.org>
Date: Sat, 6 Mar 2010 12:15:03 +0000
Subject: [PATCH] (svn r19335) -Codechange: StationRect::BeforeAddTile()
 returns a CommandCost.

---
 src/base_station_base.h |  3 ++-
 src/station.cpp         | 17 +++++++++++------
 2 files changed, 13 insertions(+), 7 deletions(-)

diff --git a/src/base_station_base.h b/src/base_station_base.h
index 5718edc48b..d6d97cc834 100644
--- a/src/base_station_base.h
+++ b/src/base_station_base.h
@@ -13,6 +13,7 @@
 #define BASE_STATION_BASE_H
 
 #include "core/pool_type.hpp"
+#include "command_type.h"
 #include "viewport_type.h"
 #include "station_map.h"
 
@@ -39,7 +40,7 @@ struct StationRect : public Rect {
 	void MakeEmpty();
 	bool PtInExtendedRect(int x, int y, int distance = 0) const;
 	bool IsEmpty() const;
-	bool BeforeAddTile(TileIndex tile, StationRectMode mode);
+	CommandCost BeforeAddTile(TileIndex tile, StationRectMode mode);
 	bool BeforeAddRect(TileIndex tile, int w, int h, StationRectMode mode);
 	bool AfterRemoveTile(BaseStation *st, TileIndex tile);
 	bool AfterRemoveRect(BaseStation *st, TileIndex tile, int w, int h);
diff --git a/src/station.cpp b/src/station.cpp
index ff4d823057..9ef44a2803 100644
--- a/src/station.cpp
+++ b/src/station.cpp
@@ -366,7 +366,7 @@ bool StationRect::IsEmpty() const
 	return this->left == 0 || this->left > this->right || this->top > this->bottom;
 }
 
-bool StationRect::BeforeAddTile(TileIndex tile, StationRectMode mode)
+CommandCost StationRect::BeforeAddTile(TileIndex tile, StationRectMode mode)
 {
 	int x = TileX(tile);
 	int y = TileY(tile);
@@ -386,8 +386,7 @@ bool StationRect::BeforeAddTile(TileIndex tile, StationRectMode mode)
 		int h = new_rect.bottom - new_rect.top + 1;
 		if (mode != ADD_FORCE && (w > _settings_game.station.station_spread || h > _settings_game.station.station_spread)) {
 			assert(mode != ADD_TRY);
-			_error_message = STR_ERROR_STATION_TOO_SPREAD_OUT;
-			return false;
+			return_cmd_error(STR_ERROR_STATION_TOO_SPREAD_OUT);
 		}
 
 		/* spread-out ok, return true */
@@ -398,13 +397,19 @@ bool StationRect::BeforeAddTile(TileIndex tile, StationRectMode mode)
 	} else {
 		; // new point is inside the rect, we don't need to do anything
 	}
-	return true;
+	return CommandCost();
 }
 
 bool StationRect::BeforeAddRect(TileIndex tile, int w, int h, StationRectMode mode)
 {
-	return (mode == ADD_FORCE || (w <= _settings_game.station.station_spread && h <= _settings_game.station.station_spread)) && // important when the old rect is completely inside the new rect, resp. the old one was empty
-			this->BeforeAddTile(tile, mode) && this->BeforeAddTile(TILE_ADDXY(tile, w - 1, h - 1), mode);
+	if (mode == ADD_FORCE || (w <= _settings_game.station.station_spread && h <= _settings_game.station.station_spread)) {
+		/* Important when the old rect is completely inside the new rect, resp. the old one was empty. */
+		CommandCost ret = this->BeforeAddTile(tile, mode);
+		if (ret.Succeeded()) ret = this->BeforeAddTile(TILE_ADDXY(tile, w - 1, h - 1), mode);
+		if (ret.Succeeded()) return true;
+		ret.SetGlobalErrorMessage();
+	}
+	return false;
 }
 
 /**