(svn r5210) Many small changes which piled up: const, unsigned, variable scope, CSE for readability, DeMorgan, if cascades -> switch, whitespace, parentheses, bracing, misc.

5 files changed, 134 insertions, 136 deletions

diff --git a/ai/ai.c b/ai/ai.c
index 907154ed3..1991ebefa 100644
--- a/ai/ai.c
+++ b/ai/ai.c
@@ -97,7 +97,7 @@ int32 AI_DoCommandCc(TileIndex tile, uint32 p1, uint32 p2, uint32 flags, uint pr
 	/* First, do a test-run to see if we can do this */
 	res = DoCommand(tile, p1, p2, flags & ~DC_EXEC, procc);
 	/* The command failed, or you didn't want to execute, or you are quering, return */
-	if ((CmdFailed(res)) || !(flags & DC_EXEC) || (flags & DC_QUERY_COST)) {
+	if (CmdFailed(res) || !(flags & DC_EXEC) || (flags & DC_QUERY_COST)) {
 		return res;
 	}
 
@@ -105,25 +105,28 @@ int32 AI_DoCommandCc(TileIndex tile, uint32 p1, uint32 p2, uint32 flags, uint pr
 	_cmd_text = tmp_cmdtext;
 
 	/* If we did a DC_EXEC, and the command did not return an error, execute it
-	    over the network */
-	if (flags & DC_AUTO)                  procc |= CMD_AUTO;
-	if (flags & DC_NO_WATER)              procc |= CMD_NO_WATER;
+	 * over the network */
+	if (flags & DC_AUTO)     procc |= CMD_AUTO;
+	if (flags & DC_NO_WATER) procc |= CMD_NO_WATER;
 
 	/* NetworkSend_Command needs _local_player to be set correctly, so
-	    adjust it, and put it back right after the function */
+	 * adjust it, and put it back right after the function */
 	old_lp = _local_player;
 	_local_player = _current_player;
 
 #ifdef ENABLE_NETWORK
 	/* Send the command */
-	if (_networking)
+	if (_networking) {
 		/* Network is easy, send it to his handler */
 		NetworkSend_Command(tile, p1, p2, procc, callback);
-	else
+	} else {
+#else
+	{
 #endif
 		/* If we execute BuildCommands directly in SP, we have a big problem with events
 		 *  so we need to delay is for 1 tick */
 		AI_PutCommandInQueue(_current_player, tile, p1, p2, procc, callback);
+	}
 
 	/* Set _local_player back */
 	_local_player = old_lp;
@@ -173,16 +176,14 @@ void AI_RunGameLoop(void)
 	 *   them.. this avoids that, while loading a network game in singleplayer, does make
 	 *   the AIs to continue ;))
 	 */
-	if (_networking && !_network_server && !_ai.network_client)
-		return;
+	if (_networking && !_network_server && !_ai.network_client) return;
 
 	/* New tick */
 	_ai.tick++;
 
 	/* Make sure the AI follows the difficulty rule.. */
 	assert(_opt.diff.competitor_speed <= 4);
-	if ((_ai.tick & ((1 << (4 - _opt.diff.competitor_speed)) - 1)) != 0)
-		return;
+	if ((_ai.tick & ((1 << (4 - _opt.diff.competitor_speed)) - 1)) != 0) return;
 
 	/* Check for AI-client (so joining a network with an AI) */
 	if (_ai.network_client && _ai_player[_ai.network_playas].active) {
@@ -191,7 +192,7 @@ void AI_RunGameLoop(void)
 		AI_RunTick(_ai.network_playas);
 	} else if (!_networking || _network_server) {
 		/* Check if we want to run AIs (server or SP only) */
-		Player *p;
+		const Player* p;
 
 		FOR_ALL_PLAYERS(p) {
 			if (p->is_active && p->is_ai) {
@@ -224,8 +225,9 @@ void AI_StartNewAI(PlayerID player)
  */
 void AI_PlayerDied(PlayerID player)
 {
-	if (_ai.network_client && _ai.network_playas == player)
+	if (_ai.network_client && _ai.network_playas == player) {
 		_ai.network_playas = OWNER_SPECTATOR;
+	}
 
 	/* Called if this AI died */
 	_ai_player[player].active = false;
@@ -254,7 +256,7 @@ void AI_Initialize(void)
  */
 void AI_Uninitialize(void)
 {
-	Player* p;
+	const Player* p;
 
 	FOR_ALL_PLAYERS(p) {
 		if (p->is_active && p->is_ai) AI_PlayerDied(p->index);
diff --git a/ai/default/default.c b/ai/default/default.c
index dd682581c..213ade79e 100644
--- a/ai/default/default.c
+++ b/ai/default/default.c
@@ -348,11 +348,11 @@ static void AiHandleReplaceRoadVeh(Player *p)
 		tile = v->tile;
 
 		if (!CmdFailed(DoCommand(0, v->index, 0, DC_EXEC, CMD_SELL_ROAD_VEH)) &&
-			  !CmdFailed(DoCommand(tile, veh, 0, DC_EXEC, CMD_BUILD_ROAD_VEH)) ) {
+			  !CmdFailed(DoCommand(tile, veh, 0, DC_EXEC, CMD_BUILD_ROAD_VEH))) {
 			VehicleID veh = _new_vehicle_id;
+
 			AiRestoreVehicleOrders(GetVehicle(veh), orderbak);
 			DoCommand(0, veh, 0, DC_EXEC, CMD_START_STOP_ROADVEH);
-
 			DoCommand(0, veh, _ai_service_interval, DC_EXEC, CMD_CHANGE_SERVICE_INT);
 		}
 	}
@@ -1608,8 +1608,7 @@ clear_town_stuff:;
 			}
 		} else if (p->mode == 3) {
 			//Clear stuff and then build single rail.
-			if (GetTileSlope(c, NULL) != SLOPE_FLAT)
-				return CMD_ERROR;
+			if (GetTileSlope(c, NULL) != SLOPE_FLAT) return CMD_ERROR;
 			ret = DoCommand(c, 0, 0, flag | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, CMD_LANDSCAPE_CLEAR);
 			if (CmdFailed(ret)) return CMD_ERROR;
 			total_cost += ret + _price.build_rail;
@@ -1927,7 +1926,6 @@ static bool AiCheckRailPathBetter(AiRailFinder *arf, const byte *p)
 
 static inline void AiCheckBuildRailBridgeHere(AiRailFinder *arf, TileIndex tile, const byte *p)
 {
-	TileIndex tile_new;
 	Slope tileh;
 	uint z;
 	bool flag;
@@ -1936,7 +1934,8 @@ static inline void AiCheckBuildRailBridgeHere(AiRailFinder *arf, TileIndex tile,
 
 	tileh = GetTileSlope(tile, &z);
 	if (tileh == _dir_table_1[dir2] || (tileh == SLOPE_FLAT && z != 0)) {
-		tile_new = tile;
+		TileIndex tile_new = tile;
+
 		// Allow bridges directly over bottom tiles
 		flag = z == 0;
 		for (;;) {
@@ -1977,9 +1976,7 @@ static inline void AiCheckBuildRailTunnelHere(AiRailFinder *arf, TileIndex tile,
 
 		if (!CmdFailed(cost) && cost <= (arf->player->player_money>>4)) {
 			AiBuildRailRecursive(arf, _build_tunnel_endtile, p[0]&3);
-			if (arf->depth == 1) {
-				AiCheckRailPathBetter(arf, p);
-			}
+			if (arf->depth == 1) AiCheckRailPathBetter(arf, p);
 		}
 	}
 }
@@ -2009,6 +2006,7 @@ static void AiBuildRailRecursive(AiRailFinder *arf, TileIndex tile, int dir)
 	// Depth too deep?
 	if (arf->depth >= 4) {
 		uint dist = DistanceMaxPlusManhattan(tile, arf->final_tile);
+
 		if (dist < arf->cur_best_dist) {
 			// Store the tile that is closest to the final position.
 			arf->cur_best_depth = arf->depth;
@@ -2037,9 +2035,7 @@ static void AiBuildRailRecursive(AiRailFinder *arf, TileIndex tile, int dir)
 			}
 
 			// At the bottom depth?
-			if (arf->depth == 1) {
-				AiCheckRailPathBetter(arf, p);
-			}
+			if (arf->depth == 1) AiCheckRailPathBetter(arf, p);
 
 			p += 2;
 		} while (!(p[0]&0x80));
@@ -2093,8 +2089,9 @@ static void AiBuildRailConstruct(Player *p)
 	// Didn't find anything to build?
 	if (arf.best_ptr == NULL) {
 		// Terraform some
-		for (i=0; i!=5; i++)
+		for (i = 0; i != 5; i++) {
 			AiDoTerraformLand(p->ai.cur_tile_a, p->ai.cur_dir_a, 3, 0);
+		}
 
 		if (++p->ai.state_counter == 21) {
 			p->ai.state_counter = 40;
@@ -2112,16 +2109,16 @@ static void AiBuildRailConstruct(Player *p)
 		int i;
 		int32 bridge_len = GetBridgeLength(arf.bridge_end_tile, p->ai.cur_tile_a);
 
-		/*	Figure out what (rail)bridge type to build
-				start with best bridge, then go down to worse and worse bridges
-				unnecessary to check for worse bridge (i=0), since AI will always build that.
-				AI is so fucked up that fixing this small thing will probably not solve a thing
-		*/
+		/* Figure out which (rail)bridge type to build
+		 * start with best bridge, then go down to worse and worse bridges
+		 * unnecessary to check for worst bridge (i=0), since AI will always build
+		 * that. AI is so fucked up that fixing this small thing will probably not
+		 * solve a thing
+		 */
 		for (i = MAX_BRIDGES - 1; i != 0; i--) {
 			if (CheckBridge_Stuff(i, bridge_len)) {
 				int32 cost = DoCommand(arf.bridge_end_tile, p->ai.cur_tile_a, i | (p->ai.railtype_to_use << 8), DC_AUTO, CMD_BUILD_BRIDGE);
-				if (!CmdFailed(cost) && cost < (p->player_money >> 5))
-					break;
+				if (!CmdFailed(cost) && cost < (p->player_money >> 5)) break;
 			}
 		}
 
@@ -2130,7 +2127,7 @@ static void AiBuildRailConstruct(Player *p)
 
 		p->ai.cur_tile_a = arf.bridge_end_tile;
 		p->ai.state_counter = 0;
-	} else if (arf.best_ptr[0]&0x40) {
+	} else if (arf.best_ptr[0] & 0x40) {
 		// tunnel
 		DoCommand(p->ai.cur_tile_a, p->ai.railtype_to_use, 0, DC_AUTO | DC_EXEC, CMD_BUILD_TUNNEL);
 		p->ai.cur_tile_a = _build_tunnel_endtile;
@@ -2348,9 +2345,7 @@ static EngineID AiFindBestWagon(CargoID cargo, RailType railtype)
 			continue;
 		}
 
-		if (rvi->cargo_type != cargo) {
-			continue;
-		}
+		if (rvi->cargo_type != cargo) continue;
 
 		/* max_speed of 0 indicates no speed limit */
 		speed = rvi->max_speed == 0 ? 0xFFFF : rvi->max_speed;
@@ -2374,7 +2369,7 @@ static void AiStateBuildRailVeh(Player *p)
 	CargoID cargo;
 	int32 cost;
 	Vehicle *v;
-	uint loco_id;
+	VehicleID loco_id;
 
 	ptr = _default_rail_track_data[p->ai.src.cur_building_rule]->data;
 	while (ptr->mode != 0) ptr++;
@@ -2395,14 +2390,12 @@ static void AiStateBuildRailVeh(Player *p)
 			p->ai.wagon_list[i + 1] = INVALID_VEHICLE;
 			return;
 		}
-		if (cargo == CT_MAIL)
-			cargo = CT_PASSENGERS;
-		if (++i == p->ai.num_wagons * 2 - 1)
-			break;
+		if (cargo == CT_MAIL) cargo = CT_PASSENGERS;
+		if (++i == p->ai.num_wagons * 2 - 1) break;
 	}
 
 	// Which locomotive to build?
-	veh = AiChooseTrainToBuild(p->ai.railtype_to_use, p->player_money, (cargo!=CT_PASSENGERS)?1:0, tile);
+	veh = AiChooseTrainToBuild(p->ai.railtype_to_use, p->player_money, cargo != CT_PASSENGERS ? 1 : 0, tile);
 	if (veh == INVALID_ENGINE) {
 handle_nocash:
 		// after a while, if AI still doesn't have cash, get out of this block by selling the wagons.
@@ -2435,7 +2428,7 @@ handle_nocash:
 	}
 
 	for (i = 0; p->ai.order_list_blocks[i] != 0xFF; i++) {
-		AiBuildRec *aib = (&p->ai.src) + p->ai.order_list_blocks[i];
+		const AiBuildRec* aib = &p->ai.src + p->ai.order_list_blocks[i];
 		bool is_pass = (
 			p->ai.cargo_type == CT_PASSENGERS ||
 			p->ai.cargo_type == CT_MAIL ||
@@ -2615,11 +2608,8 @@ clear_town_stuff:;
 // Make sure the blocks are not too close to each other
 static bool AiCheckBlockDistances(Player *p, TileIndex tile)
 {
-	AiBuildRec *aib;
-	int num;
-
-	num = p->ai.num_build_rec;
-	aib = &p->ai.src;
+	const AiBuildRec* aib = &p->ai.src;
+	uint num = p->ai.num_build_rec;
 
 	do {
 		if (aib->cur_building_rule != 255) {
@@ -2835,7 +2825,6 @@ static bool AiBuildRoadHelper(TileIndex tile, int flags, int type)
 
 static inline void AiCheckBuildRoadBridgeHere(AiRoadFinder *arf, TileIndex tile, const byte *p)
 {
-	TileIndex tile_new;
 	Slope tileh;
 	uint z;
 	bool flag;
@@ -2844,7 +2833,8 @@ static inline void AiCheckBuildRoadBridgeHere(AiRoadFinder *arf, TileIndex tile,
 
 	tileh = GetTileSlope(tile, &z);
 	if (tileh == _dir_table_1[dir2] || (tileh == SLOPE_FLAT && z != 0)) {
-		tile_new = tile;
+		TileIndex tile_new = tile;
+
 		// Allow bridges directly over bottom tiles
 		flag = z == 0;
 		for (;;) {
@@ -2885,9 +2875,7 @@ static inline void AiCheckBuildRoadTunnelHere(AiRoadFinder *arf, TileIndex tile,
 
 		if (!CmdFailed(cost) && cost <= (arf->player->player_money>>4)) {
 			AiBuildRoadRecursive(arf, _build_tunnel_endtile, p[0]&3);
-			if (arf->depth == 1) {
-				AiCheckRoadPathBetter(arf, p);
-			}
+			if (arf->depth == 1)  AiCheckRoadPathBetter(arf, p);
 		}
 	}
 }
@@ -3032,7 +3020,6 @@ do_some_terraform:
 		p->ai.cur_tile_a = _build_tunnel_endtile;
 		p->ai.state_counter = 0;
 	} else {
-
 		// road
 		if (!AiBuildRoadHelper(tile, DC_EXEC | DC_AUTO | DC_NO_WATER | DC_AI_BUILDING, arf.best_ptr[0]))
 			goto do_some_terraform;
@@ -3062,8 +3049,9 @@ static void AiBuildRoad(Player *p)
 		uint i;
 
 		// Terraform some and then try building again.
-		for (i = 0; i != 4; i++)
+		for (i = 0; i != 4; i++) {
 			AiDoTerraformLand(p->ai.cur_tile_a, p->ai.cur_dir_a, 3, 0);
+		}
 
 		if (++p->ai.state_counter == 4) {
 			p->ai.state_counter = 0;
@@ -3156,7 +3144,7 @@ static void AiStateBuildRoadVehicles(Player *p)
 {
 	const AiDefaultBlockData *ptr;
 	TileIndex tile;
-	uint loco_id;
+	VehicleID loco_id;
 	EngineID veh;
 	uint i;
 
@@ -3227,7 +3215,7 @@ static void AiStateDeleteRoadBlocks(Player *p)
 
 static void AiStateAirportStuff(Player *p)
 {
-	Station *st;
+	const Station* st;
 	byte acc_planes;
 	int i;
 	AiBuildRec *aib;
@@ -3449,10 +3437,10 @@ static void AiStateBuildAircraftVehicles(Player *p)
 	TileIndex tile;
 	EngineID veh;
 	int i;
-	uint loco_id;
+	VehicleID loco_id;
 
 	ptr = _airport_default_block_data[p->ai.src.cur_building_rule];
-	for (;ptr->mode!=0;ptr++) {}
+	for (; ptr->mode != 0; ptr++) {}
 
 	tile = TILE_ADD(p->ai.src.use_tile, ToTileIndexDiff(ptr->tileoffs));
 
@@ -3465,7 +3453,7 @@ static void AiStateBuildAircraftVehicles(Player *p)
 	if (CmdFailed(DoCommand(tile, veh, 0, DC_EXEC, CMD_BUILD_AIRCRAFT))) return;
 	loco_id = _new_vehicle_id;
 
-	for (i=0; p->ai.order_list_blocks[i] != 0xFF; i++) {
+	for (i = 0; p->ai.order_list_blocks[i] != 0xFF; i++) {
 		AiBuildRec *aib = (&p->ai.src) + p->ai.order_list_blocks[i];
 		bool is_pass = (p->ai.cargo_type == CT_PASSENGERS || p->ai.cargo_type == CT_MAIL);
 		Order order;
@@ -3664,27 +3652,20 @@ pos_3:
 
 		if (GetRoadTileType(tile) == ROAD_TILE_DEPOT) {
 			DiagDirection dir;
+			TileIndex t;
 
 			// Check if there are any stations around.
-			if (IsTileType(tile + TileDiffXY(-1, 0), MP_STATION) &&
-					IsTileOwner(tile + TileDiffXY(-1, 0), _current_player)) {
-				return;
-			}
+			t = tile + TileDiffXY(-1, 0);
+			if (IsTileType(t, MP_STATION) && IsTileOwner(t, _current_player)) return;
 
-			if (IsTileType(tile + TileDiffXY(1, 0), MP_STATION) &&
-					IsTileOwner(tile + TileDiffXY(1, 0), _current_player)) {
-				return;
-			}
+			t = tile + TileDiffXY(1, 0);
+			if (IsTileType(t, MP_STATION) && IsTileOwner(t, _current_player)) return;
 
-			if (IsTileType(tile + TileDiffXY(0, -1), MP_STATION) &&
-					IsTileOwner(tile + TileDiffXY(0, -1), _current_player)) {
-				return;
-			}
+			t = tile + TileDiffXY(0, -1);
+			if (IsTileType(t, MP_STATION) && IsTileOwner(t, _current_player)) return;
 
-			if (IsTileType(tile + TileDiffXY(0, 1), MP_STATION) &&
-					IsTileOwner(tile + TileDiffXY(0, 1), _current_player)) {
-				return;
-			}
+			t = tile + TileDiffXY(0, 1);
+			if (IsTileType(t, MP_STATION) && IsTileOwner(t, _current_player)) return;
 
 			dir = GetRoadDepotDirection(tile);
 
@@ -3881,8 +3862,7 @@ void AiDoGameLoop(Player *p)
 	//  or in %
 	_ai_service_interval = _patches.servint_ispercent?80:180;
 
-	if (IS_HUMAN_PLAYER(_current_player))
-		return;
+	if (IS_HUMAN_PLAYER(_current_player)) return;
 
 	AiAdjustLoan(p);
 	AiBuildCompanyHQ(p);
diff --git a/ai/trolly/build.c b/ai/trolly/build.c
index 1f4324355..64339245e 100644
--- a/ai/trolly/build.c
+++ b/ai/trolly/build.c
@@ -68,14 +68,15 @@ int AiNew_Build_Bridge(Player *p, TileIndex tile_a, TileIndex tile_b, byte flag)
 			if (type2 != 0) break;
 		}
 	}
-	// There is only one bridge that can be build..
+	// There is only one bridge that can be built
 	if (type2 == 0 && type != 0) type2 = type;
 
 	// Now, simply, build the bridge!
-	if (p->ainew.tbt == AI_TRAIN)
-		return AI_DoCommand(tile_a, tile_b, (0<<8) + type2, flag | DC_AUTO, CMD_BUILD_BRIDGE);
-
-	return AI_DoCommand(tile_a, tile_b, (0x80 << 8) + type2, flag | DC_AUTO, CMD_BUILD_BRIDGE);
+	if (p->ainew.tbt == AI_TRAIN) {
+		return AI_DoCommand(tile_a, tile_b, (0x00 << 8) + type2, flag | DC_AUTO, CMD_BUILD_BRIDGE);
+	} else {
+		return AI_DoCommand(tile_a, tile_b, (0x80 << 8) + type2, flag | DC_AUTO, CMD_BUILD_BRIDGE);
+	}
 }
 
 
@@ -102,7 +103,10 @@ int AiNew_Build_RoutePart(Player *p, Ai_PathFinderInfo *PathFinderInfo, byte fla
 	//  the first pieces and the last piece
 	if (part < 1) part = 1;
 	// When we are done, stop it
-	if (part >= PathFinderInfo->route_length - 1) { PathFinderInfo->position = -2; return 0; }
+	if (part >= PathFinderInfo->route_length - 1) {
+		PathFinderInfo->position = -2;
+		return 0;
+	}
 
 
 	if (PathFinderInfo->rail_or_road) {
@@ -112,7 +116,7 @@ int AiNew_Build_RoutePart(Player *p, Ai_PathFinderInfo *PathFinderInfo, byte fla
 			PathFinderInfo->position++;
 			// TODO: problems!
 			if (CmdFailed(cost)) {
-				DEBUG(ai,0)("[AiNew - BuildPath] We have a serious problem: tunnel could not be build!");
+				DEBUG(ai,0)("[AiNew - BuildPath] We have a serious problem: tunnel could not be built!");
 				return 0;
 			}
 			return cost;
@@ -123,7 +127,7 @@ int AiNew_Build_RoutePart(Player *p, Ai_PathFinderInfo *PathFinderInfo, byte fla
 			PathFinderInfo->position++;
 			// TODO: problems!
 			if (CmdFailed(cost)) {
-				DEBUG(ai,0)("[AiNew - BuildPath] We have a serious problem: bridge could not be build!");
+				DEBUG(ai,0)("[AiNew - BuildPath] We have a serious problem: bridge could not be built!");
 				return 0;
 			}
 			return cost;
@@ -131,7 +135,7 @@ int AiNew_Build_RoutePart(Player *p, Ai_PathFinderInfo *PathFinderInfo, byte fla
 
 		// Build normal rail
 		// Keep it doing till we go an other way
-		if (route_extra[part-1] == 0 && route_extra[part] == 0) {
+		if (route_extra[part - 1] == 0 && route_extra[part] == 0) {
 			while (route_extra[part] == 0) {
 				// Get the current direction
 				dir = AiNew_GetRailDirection(route[part-1], route[part], route[part+1]);
diff --git a/ai/trolly/pathfinder.c b/ai/trolly/pathfinder.c
index 09027454c..772ddda46 100644
--- a/ai/trolly/pathfinder.c
+++ b/ai/trolly/pathfinder.c
@@ -57,7 +57,8 @@ static bool IsRoad(TileIndex tile)
 // Check if the current tile is in our end-area
 static int32 AyStar_AiPathFinder_EndNodeCheck(AyStar *aystar, OpenListNode *current)
 {
-	Ai_PathFinderInfo *PathFinderInfo = (Ai_PathFinderInfo*)aystar->user_target;
+	const Ai_PathFinderInfo* PathFinderInfo = aystar->user_target;
+
 	// It is not allowed to have a station on the end of a bridge or tunnel ;)
 	if (current->path.node.user_data[0] != 0) return AYSTAR_DONE;
 	if (TILES_BETWEEN(current->path.node.tile, PathFinderInfo->end_tile_tl, PathFinderInfo->end_tile_br))
@@ -155,9 +156,11 @@ void clean_AyStar_AiPathFinder(AyStar *aystar, Ai_PathFinderInfo *PathFinderInfo
 	// Now we add all the starting tiles
 	for (x = TileX(PathFinderInfo->start_tile_tl); x <= TileX(PathFinderInfo->start_tile_br); x++) {
 		for (y = TileY(PathFinderInfo->start_tile_tl); y <= TileY(PathFinderInfo->start_tile_br); y++) {
-			if (!(IsTileType(TileXY(x, y), MP_CLEAR) || IsTileType(TileXY(x, y), MP_TREES))) continue;
-			if (!TestCanBuildStationHere(TileXY(x, y), TEST_STATION_NO_DIR)) continue;
-			start_node.node.tile = TileXY(x, y);
+			TileIndex tile = TileXY(x, y);
+
+			if (!IsTileType(tile, MP_CLEAR) && !IsTileType(tile, MP_TREES)) continue;
+			if (!TestCanBuildStationHere(tile, TEST_STATION_NO_DIR)) continue;
+			start_node.node.tile = tile;
 			aystar->addstart(aystar, &start_node.node, 0);
 		}
 	}
@@ -167,8 +170,9 @@ void clean_AyStar_AiPathFinder(AyStar *aystar, Ai_PathFinderInfo *PathFinderInfo
 // The h-value, simple calculation
 static int32 AyStar_AiPathFinder_CalculateH(AyStar *aystar, AyStarNode *current, OpenListNode *parent)
 {
-	Ai_PathFinderInfo *PathFinderInfo = (Ai_PathFinderInfo*)aystar->user_target;
+	const Ai_PathFinderInfo* PathFinderInfo = aystar->user_target;
 	int r, r2;
+
 	if (PathFinderInfo->end_direction != AI_PATHFINDER_NO_DIRECTION) {
 		// The station is pointing to a direction, add a tile towards that direction, so the H-value is more accurate
 		r = DistanceManhattan(current->tile, PathFinderInfo->end_tile_tl + TileOffsByDir(PathFinderInfo->end_direction));
@@ -447,13 +451,15 @@ static int32 AyStar_AiPathFinder_CalculateG(AyStar *aystar, AyStarNode *current,
 		// Check if we are going up or down, first for the starting point
 		// In user_data[0] is at the 8th bit the direction
 		if (!HASBIT(BRIDGE_NO_FOUNDATION, parent_tileh)) {
-			if (GetBridgeFoundation(parent_tileh, (current->user_data[0] >> 8) & 1) < 15)
+			if (GetBridgeFoundation(parent_tileh, (current->user_data[0] >> 8) & 1) < 15) {
 				res += AI_PATHFINDER_BRIDGE_GOES_UP_PENALTY;
+			}
 		}
 		// Second for the end point
 		if (!HASBIT(BRIDGE_NO_FOUNDATION, tileh)) {
-			if (GetBridgeFoundation(tileh, (current->user_data[0] >> 8) & 1) < 15)
+			if (GetBridgeFoundation(tileh, (current->user_data[0] >> 8) & 1) < 15) {
 				res += AI_PATHFINDER_BRIDGE_GOES_UP_PENALTY;
+			}
 		}
 		if (parent_tileh == SLOPE_FLAT) res += AI_PATHFINDER_BRIDGE_GOES_UP_PENALTY;
 		if (tileh == SLOPE_FLAT) res += AI_PATHFINDER_BRIDGE_GOES_UP_PENALTY;
@@ -466,10 +472,11 @@ static int32 AyStar_AiPathFinder_CalculateG(AyStar *aystar, AyStarNode *current,
 		if (parent->path.parent != NULL &&
 				AiNew_GetDirection(current->tile, parent->path.node.tile) != AiNew_GetDirection(parent->path.node.tile, parent->path.parent->node.tile)) {
 			// When road exists, we don't like turning, but its free, so don't be to piggy about it
-			if (IsRoad(parent->path.node.tile))
+			if (IsRoad(parent->path.node.tile)) {
 				res += AI_PATHFINDER_DIRECTION_CHANGE_ON_EXISTING_ROAD_PENALTY;
-			else
+			} else {
 				res += AI_PATHFINDER_DIRECTION_CHANGE_PENALTY;
+			}
 		}
 	} else {
 		// For rail we have 1 exeption: diagonal rail..
diff --git a/ai/trolly/trolly.c b/ai/trolly/trolly.c
index 9bd581a8e..33ef6020d 100644
--- a/ai/trolly/trolly.c
+++ b/ai/trolly/trolly.c
@@ -128,16 +128,19 @@ static void AiNew_State_WakeUp(Player *p)
 		} else if (c < 100 && !_patches.ai_disable_veh_roadveh) {
 			// Do we have any spots for road-vehicles left open?
 			if (GetFreeUnitNumber(VEH_Road) <= _patches.max_roadveh) {
-				if (c < 85)
+				if (c < 85) {
 					p->ainew.action = AI_ACTION_TRUCK_ROUTE;
-				else
+				} else {
 					p->ainew.action = AI_ACTION_BUS_ROUTE;
+				}
 			}
-		}/* else if (c < 200 && !_patches.ai_disable_veh_train) {
+#if 0
+		} else if (c < 200 && !_patches.ai_disable_veh_train) {
 			if (GetFreeUnitNumber(VEH_Train) <= _patches.max_trains) {
 				p->ainew.action = AI_ACTION_TRAIN_ROUTE;
 			}
-		}*/
+#endif
+		}
 
 		p->ainew.counter = 0;
 	}
@@ -208,8 +211,8 @@ static void AiNew_State_ActionDone(Player *p)
 static bool AiNew_Check_City_or_Industry(Player *p, int ic, byte type)
 {
 	if (type == AI_CITY) {
-		Town *t = GetTown(ic);
-		Station *st;
+		const Town* t = GetTown(ic);
+		const Station* st;
 		uint count = 0;
 		int j = 0;
 
@@ -270,8 +273,8 @@ static bool AiNew_Check_City_or_Industry(Player *p, int ic, byte type)
 		return true;
 	}
 	if (type == AI_INDUSTRY) {
-		Industry *i = GetIndustry(ic);
-		Station *st;
+		const Industry* i = GetIndustry(ic);
+		const Station* st;
 		int count = 0;
 		int j = 0;
 
@@ -379,10 +382,11 @@ static void AiNew_State_LocateRoute(Player *p)
 	if (p->ainew.from_ic == -1) {
 		if (p->ainew.temp == -1) {
 			// First, we pick a random spot to search from
-			if (p->ainew.from_type == AI_CITY)
+			if (p->ainew.from_type == AI_CITY) {
 				p->ainew.temp = AI_RandomRange(_total_towns);
-			else
+			} else {
 				p->ainew.temp = AI_RandomRange(_total_industries);
+			}
 		}
 
 		if (!AiNew_Check_City_or_Industry(p, p->ainew.temp, p->ainew.from_type)) {
@@ -414,10 +418,11 @@ static void AiNew_State_LocateRoute(Player *p)
 	// Find a to-city
 	if (p->ainew.temp == -1) {
 		// First, we pick a random spot to search to
-		if (p->ainew.to_type == AI_CITY)
+		if (p->ainew.to_type == AI_CITY) {
 			p->ainew.temp = AI_RandomRange(_total_towns);
-		else
+		} else {
 			p->ainew.temp = AI_RandomRange(_total_industries);
+		}
 	}
 
 	// The same city is not allowed
@@ -425,9 +430,10 @@ static void AiNew_State_LocateRoute(Player *p)
 	if (p->ainew.temp != p->ainew.from_ic && AiNew_Check_City_or_Industry(p, p->ainew.temp, p->ainew.to_type)) {
 		// Maybe it is valid..
 
-		// We need to know if they are not to far apart from eachother..
-		// We do that by checking how much cargo we have to move and how long the route
-		//   is.
+		/* We need to know if they are not to far apart from eachother..
+		 * We do that by checking how much cargo we have to move and how long the
+		 * route is.
+		 */
 
 		if (p->ainew.from_type == AI_CITY && p->ainew.tbt == AI_BUS) {
 			const Town* town_from = GetTown(p->ainew.from_ic);
@@ -470,7 +476,7 @@ static void AiNew_State_LocateRoute(Player *p)
 				for (i = 0; i < lengthof(ind_temp->accepts_cargo); i++) {
 					if (ind_temp->accepts_cargo[i] == CT_INVALID) break;
 					if (ind_from->produced_cargo[0] == ind_temp->accepts_cargo[i]) {
-						// Found a compatbiel industry
+						// Found a compatible industry
 						max_cargo = ind_from->total_production[0] - ind_from->total_transported[0];
 						found = true;
 						p->ainew.from_deliver = true;
@@ -672,7 +678,7 @@ static void AiNew_State_FindStation(Player *p)
 			}
 		}
 
-		// If i is still zero, we did not found anything :(
+		// If i is still zero, we did not find anything
 		if (i == 0) {
 			p->ainew.state = AI_STATE_NOTHING;
 			return;
@@ -682,7 +688,7 @@ static void AiNew_State_FindStation(Player *p)
 		best = 0;
 		new_tile = 0;
 
-		for (x=0;x<i;x++) {
+		for (x = 0; x < i; x++) {
 			if (found_best[x] > best ||
 					(found_best[x] == best && DistanceManhattan(tile, new_tile) > DistanceManhattan(tile, found_spot[x]))) {
 				new_tile = found_spot[x];
@@ -753,10 +759,7 @@ static void AiNew_State_FindPath(Player *p)
 			p->ainew.path_info.end_direction = p->ainew.to_direction;
 		}
 
-		if (p->ainew.tbt == AI_TRAIN)
-			p->ainew.path_info.rail_or_road = true;
-		else
-			p->ainew.path_info.rail_or_road = false;
+		p->ainew.path_info.rail_or_road = (p->ainew.tbt == AI_TRAIN);
 
 		// First, clean the pathfinder with our new begin and endpoints
 		clean_AyStar_AiPathFinder(p->ainew.pathfinder, &p->ainew.path_info);
@@ -766,20 +769,21 @@ static void AiNew_State_FindPath(Player *p)
 
 	// Start the pathfinder
 	r = p->ainew.pathfinder->main(p->ainew.pathfinder);
-	// If it return: no match, stop it...
-	if (r == AYSTAR_NO_PATH) {
-		DEBUG(ai,1)("[AiNew] PathFinder found no route!");
-		// Start all over again...
-		p->ainew.state = AI_STATE_NOTHING;
-		return;
-	}
-	if (r == AYSTAR_FOUND_END_NODE) {
-		// We found the end-point
-		p->ainew.temp = -1;
-		p->ainew.state = AI_STATE_FIND_DEPOT;
-		return;
+	switch (r) {
+		case AYSTAR_NO_PATH:
+			DEBUG(ai,1)("[AiNew] PathFinder found no route!");
+			// Start all over again
+			p->ainew.state = AI_STATE_NOTHING;
+			break;
+
+		case AYSTAR_FOUND_END_NODE: // We found the end-point
+			p->ainew.temp = -1;
+			p->ainew.state = AI_STATE_FIND_DEPOT;
+			break;
+
+		// In any other case, we are still busy finding the route
+		default: break;
 	}
-	// In any other case, we are still busy finding the route...
 }
 
 
@@ -900,10 +904,11 @@ static int AiNew_HowManyVehicles(Player *p)
 		length = p->ainew.path_info.route_length;
 		// Calculating tiles a day a vehicle moves is not easy.. this is how it must be done!
 		tiles_a_day = RoadVehInfo(i)->max_speed * DAY_TICKS / 256 / 16;
-		if (p->ainew.from_deliver)
+		if (p->ainew.from_deliver) {
 			max_cargo = GetIndustry(p->ainew.from_ic)->total_production[0];
-		else
+		} else {
 			max_cargo = GetIndustry(p->ainew.to_ic)->total_production[0];
+		}
 
 		// This is because moving 60% is more than we can dream of!
 		max_cargo *= 0.6;
@@ -1109,7 +1114,7 @@ static void AiNew_State_BuildDepot(Player *p)
 
 	if (IsTileType(p->ainew.depot_tile, MP_STREET) && GetRoadTileType(p->ainew.depot_tile) == ROAD_TILE_DEPOT) {
 		if (IsTileOwner(p->ainew.depot_tile, _current_player)) {
-			// The depot is already builded!
+			// The depot is already built
 			p->ainew.state = AI_STATE_BUILD_VEHICLE;
 			return;
 		} else {