From af18c30f30d550b98f7fe3dc89c8977a2aeb7f51 Mon Sep 17 00:00:00 2001
From: rubidium <rubidium@openttd.org>
Date: Thu, 16 Sep 2010 16:31:57 +0000
Subject: [PATCH] (svn r20816) -Codechange [FS#3835]: make waypoint default
 names work like depots, stations and vehicles (Krille)

---
 src/depot_base.h           |  2 +-
 src/saveload/afterload.cpp | 13 +++++++++++++
 src/town.h                 |  8 ++++----
 src/waypoint_base.h        |  2 +-
 src/waypoint_cmd.cpp       |  8 +-------
 5 files changed, 20 insertions(+), 13 deletions(-)

diff --git a/src/depot_base.h b/src/depot_base.h
index 4bc4af67c7..04957c8cb3 100644
--- a/src/depot_base.h
+++ b/src/depot_base.h
@@ -23,7 +23,7 @@ struct Depot : DepotPool::PoolItem<&_depot_pool> {
 	char *name;
 
 	TileIndex xy;
-	uint16 town_cn;    ///< The Nth depot for this town (consecutive number)
+	uint16 town_cn;    ///< The N-1th depot for this town (consecutive number)
 	Date build_date;   ///< Date of construction
 
 	Depot(TileIndex xy = INVALID_TILE) : xy(xy) {}
diff --git a/src/saveload/afterload.cpp b/src/saveload/afterload.cpp
index 61183f30c2..348cbb6c61 100644
--- a/src/saveload/afterload.cpp
+++ b/src/saveload/afterload.cpp
@@ -2295,6 +2295,19 @@ bool AfterLoadGame()
 				SetWaterClass(t, WATER_CLASS_INVALID);
 			}
 		}
+
+		/* Waypoints with custom name may have a non-unique town_cn,
+		 * renumber those. First set all affected waypoints to the
+		 * highest possible number to get them numbered in the
+		 * order they have in the pool. */
+		Waypoint *wp;
+		FOR_ALL_WAYPOINTS(wp) {
+			if (wp->name != NULL) wp->town_cn = UINT16_MAX;
+		}
+
+		FOR_ALL_WAYPOINTS(wp) {
+			if (wp->name != NULL) MakeDefaultName(wp);
+		}
 	}
 
 	/* Road stops is 'only' updating some caches */
diff --git a/src/town.h b/src/town.h
index 6e3533d8dc..d2f0ba143a 100644
--- a/src/town.h
+++ b/src/town.h
@@ -240,8 +240,8 @@ extern TownID _new_town_id;
 template <class T>
 void MakeDefaultName(T *obj)
 {
-	/* We only want to set names if it hasn't been set before. */
-	assert(obj->name == NULL);
+	/* We only want to set names if it hasn't been set before, or when we're calling from afterload. */
+	assert(obj->name == NULL || obj->town_cn == UINT16_MAX);
 
 	obj->town = ClosestTownFromTile(obj->xy, UINT_MAX);
 
@@ -266,8 +266,8 @@ void MakeDefaultName(T *obj)
 
 		/* check only valid waypoints... */
 		if (lobj != NULL && obj != lobj) {
-			/* only objects with 'generic' name within the same city and with the same type*/
-			if (lobj->name == NULL && lobj->town == obj->town && lobj->IsOfType(obj)) {
+			/* only objects within the same city and with the same type */
+			if (lobj->town == obj->town && lobj->IsOfType(obj)) {
 				/* if lobj->town_cn < next, uint will overflow to '+inf' */
 				uint i = (uint)lobj->town_cn - next;
 
diff --git a/src/waypoint_base.h b/src/waypoint_base.h
index 7dc7a57538..6b8d595794 100644
--- a/src/waypoint_base.h
+++ b/src/waypoint_base.h
@@ -15,7 +15,7 @@
 #include "base_station_base.h"
 
 struct Waypoint : SpecializedStation<Waypoint, true> {
-	uint16 town_cn;    ///< The Nth waypoint for this town (consecutive number)
+	uint16 town_cn;    ///< The N-1th waypoint for this town (consecutive number)
 
 	Waypoint(TileIndex tile = INVALID_TILE) : SpecializedStation<Waypoint, true>(tile) { }
 	~Waypoint();
diff --git a/src/waypoint_cmd.cpp b/src/waypoint_cmd.cpp
index 724f193af7..c7095673a1 100644
--- a/src/waypoint_cmd.cpp
+++ b/src/waypoint_cmd.cpp
@@ -406,13 +406,7 @@ CommandCost CmdRenameWaypoint(TileIndex tile, DoCommandFlag flags, uint32 p1, ui
 
 	if (flags & DC_EXEC) {
 		free(wp->name);
-
-		if (reset) {
-			wp->name = NULL;
-			MakeDefaultName(wp);
-		} else {
-			wp->name = strdup(text);
-		}
+		wp->name = reset ? NULL : strdup(text);
 
 		wp->UpdateVirtCoord();
 	}