Codechange: Pass additional data as byte stream to command callbacks.

src/ai/ai_instance.cpp

@@ -92,14 +92,12 @@ ScriptInfo *AIInstance::FindLibrary(const char *library, int version)
 
 /**
  * DoCommand callback function for all commands executed by AIs.
- * @param result The result of the command.
  * @param cmd cmd as given to DoCommandPInternal.
+ * @param result The result of the command.
  * @param tile The tile on which the command was executed.
- * @param p1 p1 as given to DoCommandPInternal.
+ * @param data Command data as given to Command<>::Post.
- * @param p2 p2 as given to DoCommandPInternal.
- * @param text text as given to DoCommandPInternal.
  */
-void CcAI(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcAI(Commands cmd, const CommandCost &result, TileIndex tile, const CommandDataBuffer &data)
 {
 	/*
 	 * The company might not exist anymore. Check for this.
@@ -110,7 +108,7 @@ void CcAI(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, ui
 	const Company *c = Company::GetIfValid(_current_company);
 	if (c == nullptr || c->ai_instance == nullptr) return;
 
-	if (c->ai_instance->DoCommandCallback(result, tile, p1, p2, cmd)) {
+	if (c->ai_instance->DoCommandCallback(result, tile, data, cmd)) {
 		c->ai_instance->Continue();
 	}
 }

src/airport_gui.cpp

@@ -43,7 +43,7 @@ static void ShowBuildAirportPicker(Window *parent);
 
 SpriteID GetCustomAirportSprite(const AirportSpec *as, byte layout);
 
-void CcBuildAirport(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcBuildAirport(Commands cmd, const CommandCost &result, TileIndex tile, const CommandDataBuffer &)
 {
 	if (result.Failed()) return;
 

src/bridge_gui.cpp

@@ -53,18 +53,15 @@ typedef GUIList<BuildBridgeData> GUIBridgeList; ///< List of bridges, used in #B
  * @param result Whether the build succeeded
  * @param cmd unused
  * @param end_tile End tile of the bridge.
- * @param p1 packed start tile coords (~ dx)
+ * @param data Additional bitstuffed command data.
- * @param p2 various bitstuffed elements
- * - p2 = (bit  0- 7) - bridge type (hi bh)
- * - p2 = (bit  8-13) - rail type or road types.
- * - p2 = (bit 15-16) - transport type.
- * @param text unused
  */
-void CcBuildBridge(const CommandCost &result, Commands cmd, TileIndex end_tile, uint32 p1, uint32 p2, const std::string &text)
+void CcBuildBridge(Commands cmd, const CommandCost &result, TileIndex end_tile, const CommandDataBuffer &data)
 {
 	if (result.Failed()) return;
 	if (_settings_client.sound.confirm) SndPlayTileFx(SND_27_CONSTRUCTION_BRIDGE, end_tile);
 
+	auto [tile, p1, p2, text] = EndianBufferReader::ToValue<CommandTraits<CMD_BUILD_BRIDGE>::Args>(data);
+
 	TransportType transport_type = Extract<TransportType, 15, 2>(p2);
 
 	if (transport_type == TRANSPORT_ROAD) {

src/command_func.h

@@ -12,7 +12,7 @@
 
 #include "command_type.h"
 #include "company_type.h"
-#include <vector>
+#include "misc/endian_buffer.hpp"
 #include "tile_map.h"
 
 /**
@@ -34,9 +34,6 @@ static const CommandCost CMD_ERROR = CommandCost(INVALID_STRING_ID);
  */
 #define return_cmd_error(errcode) return CommandCost(errcode);
 
-/** Storage buffer for serialized command data. */
-typedef std::vector<byte> CommandDataBuffer;
-
 CommandCost DoCommandPInternal(Commands cmd, StringID err_message, CommandCallback *callback, bool my_cmd, bool estimate_only, bool network_command, TileIndex tile, uint32 p1, uint32 p2, const std::string &text);
 
 void NetworkSendCommand(Commands cmd, StringID err_message, CommandCallback *callback, CompanyID company, TileIndex tile, uint32 p1, uint32 p2, const std::string &text);
@@ -213,7 +210,7 @@ protected:
 		InternalPostResult(res, tile, estimate_only, only_sending, err_message, my_cmd);
 
 		if (!estimate_only && !only_sending && callback != nullptr) {
-			std::apply(callback, std::tuple_cat(std::tuple<const CommandCost &, Commands>{ res, Tcmd }, args));
+			callback(Tcmd, res, tile, EndianBufferWriter<CommandDataBuffer>::FromValue(args));
 		}
 
 		return res.Succeeded();

src/command_type.h

@@ -13,6 +13,7 @@
 #include "economy_type.h"
 #include "strings_type.h"
 #include "tile_type.h"
+#include <vector>
 
 struct GRFFile;
 
@@ -444,6 +445,9 @@ template <Commands Tcmd> struct CommandTraits;
 		static inline constexpr const char *name = #proc_; \
 	};
 
+/** Storage buffer for serialized command data. */
+typedef std::vector<byte> CommandDataBuffer;
+
 /**
  * Define a callback function for the client, after the command is finished.
  *
@@ -451,14 +455,12 @@ template <Commands Tcmd> struct CommandTraits;
  * are from the #CommandProc callback type. The boolean parameter indicates if the
  * command succeeded or failed.
  *
- * @param result The result of the executed command
  * @param cmd The command that was executed
+ * @param result The result of the executed command
  * @param tile The tile of the command action
- * @param p1 Additional data of the command
+ * @param data Additional data of the command
- * @param p1 Additional data of the command
- * @param text Text of the command
  * @see CommandProc
  */
-typedef void CommandCallback(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text);
+typedef void CommandCallback(Commands cmd, const CommandCost &result, TileIndex tile, const CommandDataBuffer &data);
 
 #endif /* COMMAND_TYPE_H */

src/depot_gui.cpp

@@ -117,11 +117,8 @@ extern void DepotSortList(VehicleList *list);
  * @param result the result of the cloning command
  * @param cmd unused
  * @param tile unused
- * @param p1 unused
- * @param p2 unused
- * @param text unused
  */
-void CcCloneVehicle(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcCloneVehicle(Commands cmd, const CommandCost &result, TileIndex tile, const CommandDataBuffer &)
 {
 	if (result.Failed()) return;
 

src/dock_gui.cpp

@@ -43,7 +43,7 @@ static void ShowBuildDocksDepotPicker(Window *parent);
 
 static Axis _ship_depot_direction;
 
-void CcBuildDocks(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcBuildDocks(Commands cmd, const CommandCost &result, TileIndex tile, const CommandDataBuffer &)
 {
 	if (result.Failed()) return;
 
@@ -51,7 +51,7 @@ void CcBuildDocks(const CommandCost &result, Commands cmd, TileIndex tile, uint3
 	if (!_settings_client.gui.persistent_buildingtools) ResetObjectToPlace();
 }
 
-void CcPlaySound_CONSTRUCTION_WATER(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcPlaySound_CONSTRUCTION_WATER(Commands cmd, const CommandCost &result,TileIndex tile, const CommandDataBuffer &)
 {
 	if (result.Succeeded() && _settings_client.sound.confirm) SndPlayTileFx(SND_02_CONSTRUCTION_WATER, tile);
 }

src/game/game_instance.cpp

@@ -81,16 +81,14 @@ void GameInstance::Died()
 
 /**
  * DoCommand callback function for all commands executed by Game Scripts.
- * @param result The result of the command.
  * @param cmd cmd as given to DoCommandPInternal.
+ * @param result The result of the command.
  * @param tile The tile on which the command was executed.
- * @param p1 p1 as given to DoCommandPInternal.
+ * @param data Command data as given to Command<>::Post.
- * @param p2 p2 as given to DoCommandPInternal.
- * @param text text as given to DoCommandPInternal.
  */
-void CcGame(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcGame(Commands cmd, const CommandCost &result, TileIndex tile, const CommandDataBuffer &data)
 {
-	if (Game::GetGameInstance()->DoCommandCallback(result, tile, p1, p2, cmd)) {
+	if (Game::GetGameInstance()->DoCommandCallback(result, tile, data, cmd)) {
 		Game::GetGameInstance()->Continue();
 	}
 }

src/group_gui.cpp

@@ -1141,38 +1141,47 @@ static inline VehicleGroupWindow *FindVehicleGroupWindow(VehicleType vt, Owner o
 
 /**
  * Opens a 'Rename group' window for newly created group.
- * @param result Did command succeed?
+ * @param veh_type Vehicle type.
- * @param cmd Unused.
- * @param tile Unused.
- * @param p1 Vehicle type.
- * @param p2 Unused.
- * @param text Unused.
- * @see CmdCreateGroup
  */
-void CcCreateGroup(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+static void CcCreateGroup(VehicleType veh_type)
 {
-	if (result.Failed()) return;
+	VehicleGroupWindow *w = FindVehicleGroupWindow(veh_type, _current_company);
-	assert(p1 <= VEH_AIRCRAFT);
-
-	VehicleGroupWindow *w = FindVehicleGroupWindow((VehicleType)p1, _current_company);
 	if (w != nullptr) w->ShowRenameGroupWindow(_new_group_id, true);
 }
 
 /**
- * Open rename window after adding a vehicle to a new group via drag and drop.
+ * Opens a 'Rename group' window for newly created group.
- * @param result Did command succeed?
  * @param cmd Unused.
+ * @param result Did command succeed?
  * @param tile Unused.
- * @param p1 Unused.
+ * @param data Command data.
- * @param p2 Bit 0-19: Vehicle ID.
+ * @see CmdCreateGroup
- * @param text Unused.
  */
-void CcAddVehicleNewGroup(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcCreateGroup(Commands cmd, const CommandCost &result, TileIndex tile, const CommandDataBuffer &data)
 {
 	if (result.Failed()) return;
+
+	auto [tile_, p1, p2, text] = EndianBufferReader::ToValue<CommandTraits<CMD_CREATE_GROUP>::Args>(data);
+	assert(p1 <= VEH_AIRCRAFT);
+
+	CcCreateGroup((VehicleType)p1);
+}
+
+/**
+ * Open rename window after adding a vehicle to a new group via drag and drop.
+ * @param cmd Unused.
+ * @param result Did command succeed?
+ * @param tile Unused.
+ * @param data Command data.
+ */
+void CcAddVehicleNewGroup(Commands cmd, const CommandCost &result, TileIndex tile, const CommandDataBuffer &data)
+{
+	if (result.Failed()) return;
+
+	auto [tile_, p1, p2, text] = EndianBufferReader::ToValue<CommandTraits<CMD_ADD_VEHICLE_GROUP>::Args>(data);
 	assert(Vehicle::IsValidID(GB(p2, 0, 20)));
 
-	CcCreateGroup(result, cmd, 0, Vehicle::Get(GB(p2, 0, 20))->type, 0, text);
+	CcCreateGroup(Vehicle::Get(GB(p2, 0, 20))->type);
 }
 
 /**

src/industry_gui.cpp

@@ -219,17 +219,16 @@ void SortIndustryTypes()
 
 /**
  * Command callback. In case of failure to build an industry, show an error message.
- * @param result Result of the command.
  * @param cmd    Unused.
+ * @param result Result of the command.
  * @param tile   Tile where the industry is placed.
- * @param p1     Additional data of the #CMD_BUILD_INDUSTRY command.
+ * @param data   Additional data of the #CMD_BUILD_INDUSTRY command.
- * @param p2     Additional data of the #CMD_BUILD_INDUSTRY command.
- * @param text   Unused.
  */
-void CcBuildIndustry(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcBuildIndustry(Commands cmd, const CommandCost &result, TileIndex tile, const CommandDataBuffer &data)
 {
 	if (result.Succeeded()) return;
 
+	auto [tile_, p1, p2, text] = EndianBufferReader::ToValue<CommandTraits<CMD_BUILD_INDUSTRY>::Args>(data);
 	uint8 indtype = GB(p1, 0, 8);
 	if (indtype < NUM_INDUSTRYTYPES) {
 		const IndustrySpec *indsp = GetIndustrySpec(indtype);

src/main_gui.cpp

@@ -77,7 +77,7 @@ bool HandlePlacePushButton(Window *w, int widget, CursorID cursor, HighLightStyl
 }
 
 
-void CcPlaySound_EXPLOSION(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcPlaySound_EXPLOSION(Commands cmd, const CommandCost &result, TileIndex tile, const CommandDataBuffer &)
 {
 	if (result.Succeeded() && _settings_client.sound.confirm) SndPlayTileFx(SND_12_EXPLOSION, tile);
 }

src/rail_gui.cpp

@@ -89,7 +89,7 @@ static bool IsStationAvailable(const StationSpec *statspec)
 	return Convert8bitBooleanCallback(statspec->grf_prop.grffile, CBID_STATION_AVAILABILITY, cb_res);
 }
 
-void CcPlaySound_CONSTRUCTION_RAIL(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcPlaySound_CONSTRUCTION_RAIL(Commands cmd, const CommandCost &result,TileIndex tile, const CommandDataBuffer &)
 {
 	if (result.Succeeded() && _settings_client.sound.confirm) SndPlayTileFx(SND_20_CONSTRUCTION_RAIL, tile);
 }
@@ -135,10 +135,11 @@ static const DiagDirection _place_depot_extra_dir[12] = {
 	DIAGDIR_NW, DIAGDIR_NE, DIAGDIR_NW, DIAGDIR_NE,
 };
 
-void CcRailDepot(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcRailDepot(Commands cmd, const CommandCost &result, TileIndex tile, const CommandDataBuffer &data)
 {
 	if (result.Failed()) return;
 
+	auto [tile_, p1, p2, text] = EndianBufferReader::ToValue<CommandTraits<CMD_BUILD_TRAIN_DEPOT>::Args>(data);
 	DiagDirection dir = (DiagDirection)p2;
 
 	if (_settings_client.sound.confirm) SndPlayTileFx(SND_20_CONSTRUCTION_RAIL, tile);
@@ -176,7 +177,7 @@ static void PlaceRail_Waypoint(TileIndex tile)
 	}
 }
 
-void CcStation(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcStation(Commands cmd, const CommandCost &result, TileIndex tile, const CommandDataBuffer &)
 {
 	if (result.Failed()) return;
 
@@ -293,7 +294,7 @@ static void PlaceRail_Bridge(TileIndex tile, Window *w)
 }
 
 /** Command callback for building a tunnel */
-void CcBuildRailTunnel(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcBuildRailTunnel(Commands cmd, const CommandCost &result,TileIndex tile, const CommandDataBuffer &)
 {
 	if (result.Succeeded()) {
 		if (_settings_client.sound.confirm) SndPlayTileFx(SND_20_CONSTRUCTION_RAIL, tile);

src/road_gui.cpp

@@ -69,7 +69,7 @@ static RoadType _cur_roadtype;
 static DiagDirection _road_depot_orientation;
 static DiagDirection _road_station_picker_orientation;
 
-void CcPlaySound_CONSTRUCTION_OTHER(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcPlaySound_CONSTRUCTION_OTHER(Commands cmd, const CommandCost &result, TileIndex tile, const CommandDataBuffer &)
 {
 	if (result.Succeeded() && _settings_client.sound.confirm) SndPlayTileFx(SND_1F_CONSTRUCTION_OTHER, tile);
 }
@@ -92,15 +92,11 @@ static void PlaceRoad_Bridge(TileIndex tile, Window *w)
 /**
  * Callback executed after a build road tunnel command has been called.
  *
- * @param result Whether the build succeeded.
  * @param cmd unused
+ * @param result Whether the build succeeded.
  * @param start_tile Starting tile of the tunnel.
- * @param p1 bit 0-3 railtype or roadtypes
- *           bit 8-9 transport type
- * @param p2 unused
- * @param text unused
  */
-void CcBuildRoadTunnel(const CommandCost &result, Commands cmd, TileIndex start_tile, uint32 p1, uint32 p2, const std::string &text)
+void CcBuildRoadTunnel(Commands cmd, const CommandCost &result, TileIndex start_tile, const CommandDataBuffer &)
 {
 	if (result.Succeeded()) {
 		if (_settings_client.sound.confirm) SndPlayTileFx(SND_1F_CONSTRUCTION_OTHER, start_tile);
@@ -133,10 +129,12 @@ void ConnectRoadToStructure(TileIndex tile, DiagDirection direction)
 	}
 }
 
-void CcRoadDepot(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcRoadDepot(Commands cmd, const CommandCost &result, TileIndex tile, const CommandDataBuffer &data)
 {
 	if (result.Failed()) return;
 
+	auto [tile_, p1, p2, text] = EndianBufferReader::ToValue<CommandTraits<CMD_BUILD_ROAD_DEPOT>::Args>(data);
+
 	DiagDirection dir = (DiagDirection)GB(p1, 0, 2);
 	if (_settings_client.sound.confirm) SndPlayTileFx(SND_1F_CONSTRUCTION_OTHER, tile);
 	if (!_settings_client.gui.persistent_buildingtools) ResetObjectToPlace();
@@ -160,10 +158,12 @@ void CcRoadDepot(const CommandCost &result, Commands cmd, TileIndex tile, uint32
  * @param text Unused.
  * @see CmdBuildRoadStop
  */
-void CcRoadStop(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcRoadStop(Commands cmd, const CommandCost &result, TileIndex tile, const CommandDataBuffer &data)
 {
 	if (result.Failed()) return;
 
+	auto [tile_, p1, p2, text] = EndianBufferReader::ToValue<CommandTraits<CMD_BUILD_ROAD_STOP>::Args>(data);
+
 	DiagDirection dir = (DiagDirection)GB(p2, 3, 2);
 	if (_settings_client.sound.confirm) SndPlayTileFx(SND_1F_CONSTRUCTION_OTHER, tile);
 	if (!_settings_client.gui.persistent_buildingtools) ResetObjectToPlace();

src/script/api/script_object.cpp

@@ -82,24 +82,22 @@ ScriptObject::ActiveInstance::~ActiveInstance()
 	return GetStorage()->mode_instance;
 }
 
-/* static */ void ScriptObject::SetLastCommand(TileIndex tile, uint32 p1, uint32 p2, Commands cmd)
+/* static */ void ScriptObject::SetLastCommand(TileIndex tile, const CommandDataBuffer &data, Commands cmd)
 {
 	ScriptStorage *s = GetStorage();
-	Debug(script, 6, "SetLastCommand company={:02d} tile={:06x} p1={:08x} p2={:08x} cmd={}", s->root_company, tile, p1, p2, cmd);
+	Debug(script, 6, "SetLastCommand company={:02d} tile={:06x} cmd={} data={}", s->root_company, tile, cmd, FormatArrayAsHex(data));
 	s->last_tile = tile;
-	s->last_p1 = p1;
+	s->last_data = data;
-	s->last_p2 = p2;
 	s->last_cmd = cmd;
 }
 
-/* static */ bool ScriptObject::CheckLastCommand(TileIndex tile, uint32 p1, uint32 p2, Commands cmd)
+/* static */ bool ScriptObject::CheckLastCommand(TileIndex tile, const CommandDataBuffer &data, Commands cmd)
 {
 	ScriptStorage *s = GetStorage();
-	Debug(script, 6, "CheckLastCommand company={:02d} tile={:06x} p1={:08x} p2={:08x} cmd={}", s->root_company, tile, p1, p2, cmd);
+	Debug(script, 6, "CheckLastCommand company={:02d} tile={:06x} cmd={} data={}", s->root_company, tile, cmd, FormatArrayAsHex(data));
 	if (s->last_tile != tile) return false;
-	if (s->last_p1 != p1) return false;
-	if (s->last_p2 != p2) return false;
 	if (s->last_cmd != cmd) return false;
+	if (s->last_data != data) return false;
 	return true;
 }
 
@@ -326,7 +324,7 @@ ScriptObject::ActiveInstance::~ActiveInstance()
 	if (GetCommandFlags(cmd) & CMD_CLIENT_ID && p2 == 0) p2 = UINT32_MAX;
 
 	/* Store the command for command callback validation. */
-	if (!estimate_only && _networking && !_generating_world) SetLastCommand(tile, p1, p2, cmd);
+	if (!estimate_only && _networking && !_generating_world) SetLastCommand(tile, EndianBufferWriter<CommandDataBuffer>::FromValue(std::make_tuple(tile, p1, p2, command_text)), cmd);
 
 	/* Try to perform the command. */
 	CommandCost res = ::DoCommandPInternal(cmd, STR_NULL, (_networking && !_generating_world) ? ScriptObject::GetActiveInstance()->GetDoCommandCallback() : nullptr, false, estimate_only, false, tile, p1, p2, command_text);

src/script/api/script_object.hpp

@@ -75,12 +75,12 @@ protected:
 	/**
 	 * Store the latest command executed by the script.
 	 */
-	static void SetLastCommand(TileIndex tile, uint32 p1, uint32 p2, Commands cmd);
+	static void SetLastCommand(TileIndex tile, const CommandDataBuffer &data, Commands cmd);
 
 	/**
 	 * Check if it's the latest command executed by the script.
 	 */
-	static bool CheckLastCommand(TileIndex tile, uint32 p1, uint32 p2, Commands cmd);
+	static bool CheckLastCommand(TileIndex tile, const CommandDataBuffer &data, Commands cmd);
 
 	/**
 	 * Sets the DoCommand costs counter to a value.

src/script/script_instance.cpp

@@ -687,11 +687,11 @@ SQInteger ScriptInstance::GetOpsTillSuspend()
 	return this->engine->GetOpsTillSuspend();
 }
 
-bool ScriptInstance::DoCommandCallback(const CommandCost &result, TileIndex tile, uint32 p1, uint32 p2, Commands cmd)
+bool ScriptInstance::DoCommandCallback(const CommandCost &result, TileIndex tile, const CommandDataBuffer &data, Commands cmd)
 {
 	ScriptObject::ActiveInstance active(this);
 
-	if (!ScriptObject::CheckLastCommand(tile, p1, p2, cmd)) {
+	if (!ScriptObject::CheckLastCommand(tile, data, cmd)) {
 		Debug(script, 1, "DoCommandCallback terminating a script, last command does not match expected command");
 		return false;
 	}
@@ -705,7 +705,7 @@ bool ScriptInstance::DoCommandCallback(const CommandCost &result, TileIndex tile
 		ScriptObject::SetLastCost(result.GetCost());
 	}
 
-	ScriptObject::SetLastCommand(INVALID_TILE, 0, 0, CMD_END);
+	ScriptObject::SetLastCommand(INVALID_TILE, {}, CMD_END);
 
 	return true;
 }

src/script/script_instance.hpp

@@ -178,12 +178,11 @@ public:
 	 * DoCommand callback function for all commands executed by scripts.
 	 * @param result The result of the command.
 	 * @param tile The tile on which the command was executed.
-	 * @param p1 p1 as given to DoCommandPInternal.
+	 * @param data Command data as given to DoCommandPInternal.
-	 * @param p2 p2 as given to DoCommandPInternal.
 	 * @param cmd cmd as given to DoCommandPInternal.
 	 * @return true if we handled result.
 	 */
-	bool DoCommandCallback(const CommandCost &result, TileIndex tile, uint32 p1, uint32 p2, Commands cmd);
+	bool DoCommandCallback(const CommandCost &result, TileIndex tile, const CommandDataBuffer &data, Commands cmd);
 
 	/**
 	 * Insert an event for this script.

src/script/script_storage.hpp

@@ -45,8 +45,7 @@ private:
 	bool last_command_res;           ///< The last result of the command.
 
 	TileIndex last_tile;             ///< The last tile passed to a command.
-	uint32 last_p1;                  ///< The last p1 passed to a command.
+	CommandDataBuffer last_data;     ///< The last data passed to a command.
-	uint32 last_p2;                  ///< The last p2 passed to a command.
 	Commands last_cmd;               ///< The last cmd passed to a command.
 
 	VehicleID new_vehicle_id;        ///< The ID of the new Vehicle.
@@ -77,8 +76,6 @@ public:
 		last_error        (STR_NULL),
 		last_command_res  (true),
 		last_tile         (INVALID_TILE),
-		last_p1           (0),
-		last_p2           (0),
 		last_cmd          (CMD_END),
 		new_vehicle_id    (0),
 		new_sign_id       (0),

src/signs_cmd.cpp

@@ -116,7 +116,7 @@ CommandCost CmdRenameSign(DoCommandFlag flags, TileIndex tile, uint32 p1, uint32
  * @param p2 unused
  * @param text unused
  */
-void CcPlaceSign(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcPlaceSign(Commands cmd, const CommandCost &result, TileIndex tile, const CommandDataBuffer &)
 {
 	if (result.Failed()) return;
 

src/terraform_gui.cpp

@@ -44,7 +44,7 @@
 
 #include "safeguards.h"
 
-void CcTerraform(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcTerraform(Commands cmd, const CommandCost &result, TileIndex tile, const CommandDataBuffer &)
 {
 	if (result.Succeeded()) {
 		if (_settings_client.sound.confirm) SndPlayTileFx(SND_1F_CONSTRUCTION_OTHER, tile);

src/town_gui.cpp

@@ -1009,7 +1009,7 @@ void ShowTownDirectory()
 	new TownDirectoryWindow(&_town_directory_desc);
 }
 
-void CcFoundTown(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcFoundTown(Commands cmd, const CommandCost &result, TileIndex tile, const CommandDataBuffer &)
 {
 	if (result.Failed()) return;
 
@@ -1017,7 +1017,7 @@ void CcFoundTown(const CommandCost &result, Commands cmd, TileIndex tile, uint32
 	if (!_settings_client.gui.persistent_buildingtools) ResetObjectToPlace();
 }
 
-void CcFoundRandomTown(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcFoundRandomTown(Commands cmd, const CommandCost &result, TileIndex tile, const CommandDataBuffer &)
 {
 	if (result.Succeeded()) ScrollMainWindowToTile(Town::Get(_new_town_id)->xy);
 }

src/train_gui.cpp

@@ -22,14 +22,11 @@
 
 /**
  * Callback for building wagons.
- * @param result The result of the command.
  * @param cmd Unused.
+ * @param result The result of the command.
  * @param tile   The tile the command was executed on.
- * @param p1 Additional data for the command (for the #CommandProc)
- * @param p2 Additional data for the command (for the #CommandProc)
- * @param text Unused.
  */
-void CcBuildWagon(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcBuildWagon(Commands cmd, const CommandCost &result, TileIndex tile, const CommandDataBuffer &)
 {
 	if (result.Failed()) return;
 

src/vehicle_gui.cpp

@@ -2622,14 +2622,13 @@ static const StringID _vehicle_msg_translation_table[][4] = {
  * @param result the result of the start/stop command
  * @param cmd unused
  * @param tile unused
- * @param p1 vehicle ID
+ * @param data Command data
- * @param p2 unused
- * @param text unused
  */
-void CcStartStopVehicle(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcStartStopVehicle(Commands cmd, const CommandCost &result, TileIndex tile, const CommandDataBuffer &data)
 {
 	if (result.Failed()) return;
 
+	auto [tile_, p1, p2, text] = EndianBufferReader::ToValue<CommandTraits<CMD_START_STOP_VEHICLE>::Args>(data);
 	const Vehicle *v = Vehicle::GetIfValid(p1);
 	if (v == nullptr || !v->IsPrimaryVehicle() || v->owner != _local_company) return;
 
@@ -3127,11 +3126,9 @@ void StopGlobalFollowVehicle(const Vehicle *v)
  * @param result indicates completion (or not) of the operation
  * @param cmd unused
  * @param tile unused
- * @param p1 unused
+ * @param data unused
- * @param p2 unused
- * @param text unused
  */
-void CcBuildPrimaryVehicle(const CommandCost &result, Commands cmd, TileIndex tile, uint32 p1, uint32 p2, const std::string &text)
+void CcBuildPrimaryVehicle(Commands cmd, const CommandCost &result, TileIndex tile, const CommandDataBuffer &data)
 {
 	if (result.Failed()) return;