Merge branch 'master' into jgrpp-beta

# Conflicts:
#	src/economy.cpp
#	src/lang/traditional_chinese.txt
#	src/order_gui.cpp
#	src/settings.cpp
#	src/settings_internal.h
#	src/table/company_settings.ini
#	src/table/currency_settings.ini
#	src/table/gameopt_settings.ini
#	src/table/misc_settings.ini
#	src/table/settings.h.preamble
#	src/table/settings.ini
#	src/table/win32_settings.ini
#	src/table/window_settings.ini

src/elrail.cpp

@@ -695,9 +695,9 @@ void DrawRailCatenary(const TileInfo *ti)
 	DrawRailCatenaryRailway(ti);
 }
 
-bool SettingsDisableElrail(int32 p1)
+void SettingsDisableElrail(int32 new_value)
 {
-	bool disable = (p1 != 0);
+	bool disable = (new_value != 0);
 
 	/* we will now walk through all electric train engines and change their railtypes if it is the wrong one*/
 	const RailType old_railtype = disable ? RAILTYPE_ELECTRIC : RAILTYPE_RAIL;
@@ -741,5 +741,4 @@ bool SettingsDisableElrail(int32 p1)
 	 * rails. It may have unintended consequences if that function is ever
 	 * extended, though. */
 	ReinitGuiAfterToggleElrail(disable);
-	return true;
 }

src/elrail_func.h

@@ -36,6 +36,6 @@ void DrawRailCatenary(const TileInfo *ti);
 void DrawRailCatenaryOnTunnel(const TileInfo *ti);
 void DrawRailCatenaryOnBridge(const TileInfo *ti);
 
-bool SettingsDisableElrail(int32 p1); ///< _settings_game.disable_elrail callback
+void SettingsDisableElrail(int32 new_value); ///< _settings_game.disable_elrail callback
 
 #endif /* ELRAIL_FUNC_H */

src/lang/english.txt

@@ -2642,6 +2642,7 @@ STR_NETWORK_ERROR_CLIENT_START                                  :{WHITE}Could no
 STR_NETWORK_ERROR_TIMEOUT                                       :{WHITE}Connection #{NUM} timed out
 STR_NETWORK_ERROR_SERVER_ERROR                                  :{WHITE}A protocol error was detected and the connection was closed
 STR_NETWORK_ERROR_BAD_PLAYER_NAME                               :{WHITE}Your player name has not been set. The name can be set at the top of the Multiplayer window
+STR_NETWORK_ERROR_BAD_SERVER_NAME                               :{WHITE}Your server name has not been set. The name can be set at the top of the Multiplayer window
 STR_NETWORK_ERROR_WRONG_REVISION                                :{WHITE}The revision of this client does not match the server's revision
 STR_NETWORK_ERROR_WRONG_PASSWORD                                :{WHITE}Wrong password
 STR_NETWORK_ERROR_SERVER_FULL                                   :{WHITE}The server is full

src/network/network.cpp

@@ -865,10 +865,6 @@ void NetworkClientJoinGame()
 
 static void NetworkInitGameInfo()
 {
-	if (_settings_client.network.server_name.empty()) {
-		_settings_client.network.server_name = "Unnamed Server";
-	}
-
 	FillStaticNetworkServerGameInfo();
 	/* The server is a client too */
 	_network_game_info.clients_on = _network_dedicated ? 0 : 1;
@@ -881,6 +877,25 @@ static void NetworkInitGameInfo()
 	ci->client_name = _settings_client.network.client_name;
 }
 
+/**
+ * Trim the given server name in place, i.e. remove leading and trailing spaces.
+ * After the trim check whether the server name is not empty.
+ * When the server name is empty a GUI error message is shown telling the
+ * user to set the servername and this function returns false.
+ *
+ * @param server_name The server name to validate. It will be trimmed of leading
+ *                    and trailing spaces.
+ * @return True iff the server name is valid.
+ */
+bool NetworkValidateServerName(std::string &server_name)
+{
+	StrTrimInPlace(server_name);
+	if (!server_name.empty()) return true;
+
+	ShowErrorMessage(STR_NETWORK_ERROR_BAD_SERVER_NAME, INVALID_STRING_ID, WL_ERROR);
+	return false;
+}
+
 /**
  * Check whether the client and server name are set, for a dedicated server and if not set them to some default
  * value and tell the user to change this as soon as possible.
@@ -890,12 +905,14 @@ static void NetworkInitGameInfo()
 static void CheckClientAndServerName()
 {
 	static const std::string fallback_client_name = "Unnamed Client";
+	StrTrimInPlace(_settings_client.network.client_name);
 	if (_settings_client.network.client_name.empty() || _settings_client.network.client_name.compare(fallback_client_name) == 0) {
 		DEBUG(net, 1, "No \"client_name\" has been set, using \"%s\" instead. Please set this now using the \"name <new name>\" command", fallback_client_name.c_str());
 		_settings_client.network.client_name = fallback_client_name;
 	}
 
 	static const std::string fallback_server_name = "Unnamed Server";
+	StrTrimInPlace(_settings_client.network.server_name);
 	if (_settings_client.network.server_name.empty() || _settings_client.network.server_name.compare(fallback_server_name) == 0) {
 		DEBUG(net, 1, "No \"server_name\" has been set, using \"%s\" instead. Please set this now using the \"server_name <new name>\" command", fallback_server_name.c_str());
 		_settings_client.network.server_name = fallback_server_name;

src/network/network_client.cpp

@@ -1563,27 +1563,22 @@ bool NetworkValidateClientName()
 }
 
 /**
- * Send the server our name.
+ * Send the server our name as callback from the setting.
+ * @param newname The new client name.
  */
-void NetworkUpdateClientName()
+void NetworkUpdateClientName(const std::string &client_name)
 {
 	NetworkClientInfo *ci = NetworkClientInfo::GetByClientID(_network_own_client_id);
-
 	if (ci == nullptr) return;
-	/* There is no validation on string settings, it is actually a post change callback.
-	 * This method is called from that post change callback. So, when the client name is
-	 * changed via the console there is no easy way to prevent an invalid name. Though,
-	 * we can prevent it getting sent here. */
-	if (!NetworkValidateClientName()) return;
 
 	/* Don't change the name if it is the same as the old name */
-	if (_settings_client.network.client_name.compare(ci->client_name) != 0) {
+	if (client_name.compare(ci->client_name) != 0) {
 		if (!_network_server) {
-			MyClient::SendSetName(_settings_client.network.client_name.c_str());
+			MyClient::SendSetName(client_name.c_str());
 		} else {
 			/* Copy to a temporary buffer so no #n gets added after our name in the settings when there are duplicate names. */
 			char temporary_name[NETWORK_CLIENT_NAME_LENGTH];
-			strecpy(temporary_name, _settings_client.network.client_name.c_str(), lastof(temporary_name));
+			strecpy(temporary_name, client_name.c_str(), lastof(temporary_name));
 			if (NetworkFindName(temporary_name, lastof(temporary_name))) {
 				NetworkTextMessage(NETWORK_ACTION_NAME_CHANGE, CC_DEFAULT, false, ci->client_name, temporary_name);
 				ci->client_name = temporary_name;

src/network/network_func.h

@@ -38,7 +38,8 @@ byte NetworkSpectatorCount();
 bool NetworkIsValidClientName(const std::string_view client_name);
 bool NetworkValidateClientName();
 bool NetworkValidateClientName(std::string &client_name);
-void NetworkUpdateClientName();
+bool NetworkValidateServerName(std::string &server_name);
+void NetworkUpdateClientName(const std::string &client_name);
 bool NetworkCompanyHasClients(CompanyID company);
 std::string NetworkChangeCompanyPassword(CompanyID company_id, std::string password);
 void NetworkReboot();

src/network/network_gui.cpp

@@ -1110,6 +1110,7 @@ struct NetworkStartServerWindow : public Window {
 				break;
 
 			case WID_NSS_GENERATE_GAME: // Start game
+				if (!CheckServerName()) return;
 				_is_network_server = true;
 				if (_ctrl_pressed) {
 					StartNewGameWithoutGUI(GENERATE_NEW_SEED);
@@ -1119,16 +1120,19 @@ struct NetworkStartServerWindow : public Window {
 				break;
 
 			case WID_NSS_LOAD_GAME:
+				if (!CheckServerName()) return;
 				_is_network_server = true;
 				ShowSaveLoadDialog(FT_SAVEGAME, SLO_LOAD);
 				break;
 
 			case WID_NSS_PLAY_SCENARIO:
+				if (!CheckServerName()) return;
 				_is_network_server = true;
 				ShowSaveLoadDialog(FT_SCENARIO, SLO_LOAD);
 				break;
 
 			case WID_NSS_PLAY_HEIGHTMAP:
+				if (!CheckServerName()) return;
 				_is_network_server = true;
 				ShowSaveLoadDialog(FT_HEIGHTMAP,SLO_LOAD);
 				break;
@@ -1148,11 +1152,13 @@ struct NetworkStartServerWindow : public Window {
 		this->SetDirty();
 	}
 
-	void OnEditboxChanged(int wid) override
+	bool CheckServerName()
 	{
-		if (wid == WID_NSS_GAMENAME) {
-			_settings_client.network.server_name = this->name_editbox.text.buf;
-		}
+		std::string str = this->name_editbox.text.buf;
+		if (!NetworkValidateServerName(str)) return false;
+
+		SetSettingValue(GetSettingFromName("network.server_name")->AsStringSetting(), str);
+		return true;
 	}
 
 	void OnTimeout() override
@@ -2214,16 +2220,13 @@ public:
 			case WID_CL_SERVER_NAME_EDIT: {
 				if (!_network_server) break;
 
-				SetSettingValue(GetSettingFromName("network.server_name")->AsStringSetting(), StrEmpty(str) ? "Unnamed Server" : str);
+				SetSettingValue(GetSettingFromName("network.server_name")->AsStringSetting(), str);
 				this->InvalidateData();
 				break;
 			}
 
 			case WID_CL_CLIENT_NAME_EDIT: {
-				std::string client_name(str);
-				if (!NetworkValidateClientName(client_name)) break;
-
-				SetSettingValue(GetSettingFromName("network.client_name")->AsStringSetting(), client_name.c_str());
+				SetSettingValue(GetSettingFromName("network.client_name")->AsStringSetting(), str);
 				this->InvalidateData();
 				break;
 			}

src/newgrf_config.cpp

@@ -292,15 +292,13 @@ void GRFParameterInfo::Finalize()
 /**
  * Update the palettes of the graphics from the config file.
  * Called when changing the default palette in advanced settings.
- * @param p1 Unused.
- * @return Always true.
+ * @param new_value Unused.
  */
-bool UpdateNewGRFConfigPalette(int32 p1)
+void UpdateNewGRFConfigPalette(int32 new_value)
 {
 	for (GRFConfig *c = _grfconfig_newgame; c != nullptr; c = c->next) c->SetSuitablePalette();
 	for (GRFConfig *c = _grfconfig_static;  c != nullptr; c = c->next) c->SetSuitablePalette();
 	for (GRFConfig *c = _all_grfs;          c != nullptr; c = c->next) c->SetSuitablePalette();
-	return true;
 }
 
 /**

src/newgrf_config.h

@@ -249,6 +249,6 @@ void ShowNewGRFSettings(bool editable, bool show_params, bool exec_changes, GRFC
 GRFTextWrapper FindUnknownGRFName(uint32 grfid, uint8 *md5sum, bool create);
 
 void UpdateNewGRFScanStatus(uint num, const char *name);
-bool UpdateNewGRFConfigPalette(int32 p1 = 0);
+void UpdateNewGRFConfigPalette(int32 new_value = 0);
 
 #endif /* NEWGRF_CONFIG_H */

src/rail_gui.cpp

@@ -2390,10 +2390,9 @@ static void SetDefaultRailGui()
 /**
  * Updates the current signal variant used in the signal GUI
  * to the one adequate to current year.
- * @param p needed to be called when a setting changes
- * @return success, needed for settings
+ * @param new_value needed to be called when a setting changes
  */
-bool ResetSignalVariant(int32 p)
+void ResetSignalVariant(int32 new_value)
 {
 	SignalVariant new_variant = (_cur_year < _settings_client.gui.semaphore_build_before ? SIG_SEMAPHORE : SIG_ELECTRIC);
 
@@ -2405,8 +2404,6 @@ bool ResetSignalVariant(int32 p)
 		}
 		_cur_signal_variant = new_variant;
 	}
-
-	return true;
 }
 
 /**

src/rail_gui.h

@@ -15,7 +15,7 @@
 
 struct Window *ShowBuildRailToolbar(RailType railtype);
 void ReinitGuiAfterToggleElrail(bool disable);
-bool ResetSignalVariant(int32 = 0);
+void ResetSignalVariant(int32 = 0);
 void InitializeRailGUI();
 DropDownList GetRailTypeDropDownList(bool for_replacement = false, bool all_option = false);
 

src/settings_internal.h

@@ -79,8 +79,6 @@ struct SettingOnGuiCtrlData {
 };
 
 struct IniItem;
-typedef bool OnChange(int32 var);           ///< callback prototype on data modification
-typedef size_t OnConvert(const char *value); ///< callback prototype for conversion error
 typedef bool OnGuiCtrl(SettingOnGuiCtrlData &data); ///< callback prototype for GUI operations
 typedef int64 OnXrefValueConvert(int64 val); ///< callback prototype for xref value conversion
 
@@ -163,11 +161,27 @@ struct SettingDesc {
 
 /** Base integer type, including boolean, settings. Only these are shown in the settings UI. */
 struct IntSettingDesc : SettingDesc {
+	/**
+	 * A check to be performed before the setting gets changed. The passed integer may be
+	 * changed by the check if that is important, for example to remove some unwanted bit.
+	 * The return value denotes whether the value, potentially after the changes,
+	 * is allowed to be used/set in the configuration.
+	 * @param value The prospective new value for the setting.
+	 * @return True when the setting is accepted.
+	 */
+	typedef bool PreChangeCheck(int32 &value);
+	/**
+	 * A callback to denote that a setting has been changed.
+	 * @param The new value for the setting.
+	 */
+	typedef void PostChangeCallback(int32 value);
+
 	IntSettingDesc(SaveLoad save, const char *name, SettingGuiFlag flags, OnGuiCtrl *guiproc, bool startup, const char *patx_name, int32 def,
-		int32 min, uint32 max, int32 interval, StringID str, StringID str_help, StringID str_val,
-		SettingCategory cat, OnChange *proc, const SettingDescEnumEntry *enumlist) :
+			int32 min, uint32 max, int32 interval, StringID str, StringID str_help, StringID str_val,
+			SettingCategory cat, PreChangeCheck pre_check, PostChangeCallback post_callback, const SettingDescEnumEntry *enumlist) :
 		SettingDesc(save, name, flags, guiproc, startup, patx_name), def(def), min(min), max(max), interval(interval),
-		str(str), str_help(str_help), str_val(str_val), cat(cat), proc(proc), enumlist(enumlist) {}
+			str(str), str_help(str_help), str_val(str_val), cat(cat), pre_check(pre_check),
+			post_callback(post_callback), enumlist(enumlist) {}
 	virtual ~IntSettingDesc() {}
 
 	int32 def;              ///< default value given when none is present
@@ -178,7 +192,8 @@ struct IntSettingDesc : SettingDesc {
 	StringID str_help;      ///< (Translated) string with help text; gui only.
 	StringID str_val;       ///< (Translated) first string describing the value.
 	SettingCategory cat;    ///< assigned categories of the setting
-	OnChange *proc;         ///< callback procedure for when the value is changed
+	PreChangeCheck *pre_check;         ///< Callback to check for the validity of the setting.
+	PostChangeCallback *post_callback; ///< Callback when the setting has been changed.
 
 	const SettingDescEnumEntry *enumlist; ///< For SGF_ENUM. The last entry must use STR_NULL
 
@@ -190,20 +205,25 @@ struct IntSettingDesc : SettingDesc {
 	bool IsIntSetting() const override { return true; }
 
 	void ChangeValue(const void *object, int32 newvalue) const;
-	void Write_ValidateSetting(const void *object, int32 value) const;
+	void MakeValueValidAndWrite(const void *object, int32 value) const;
 
 	virtual size_t ParseValue(const char *str) const;
 	void FormatValue(char *buf, const char *last, const void *object) const override;
 	void ParseValue(const IniItem *item, void *object) const override;
 	bool IsSameValue(const IniItem *item, void *object) const override;
 	int32 Read(const void *object) const;
+
+private:
+	void MakeValueValid(int32 &value) const;
+	void Write(const void *object, int32 value) const;
 };
 
 /** Boolean setting. */
 struct BoolSettingDesc : IntSettingDesc {
 	BoolSettingDesc(SaveLoad save, const char *name, SettingGuiFlag flags, OnGuiCtrl *guiproc, bool startup, const char *patx_name, bool def,
-		StringID str, StringID str_help, StringID str_val, SettingCategory cat, OnChange *proc) :
-		IntSettingDesc(save, name, flags, guiproc, startup, patx_name, def, 0, 1, 0, str, str_help, str_val, cat, proc, nullptr) {}
+		StringID str, StringID str_help, StringID str_val, SettingCategory cat,
+		PreChangeCheck pre_check, PostChangeCallback post_callback) :
+		IntSettingDesc(save, name, flags, guiproc, startup, patx_name, def, 0, 1, 0, str, str_help, str_val, cat, pre_check, post_callback, nullptr) {}
 	virtual ~BoolSettingDesc() {}
 
 	bool IsBoolSetting() const override { return true; }
@@ -213,10 +233,13 @@ struct BoolSettingDesc : IntSettingDesc {
 
 /** One of many setting. */
 struct OneOfManySettingDesc : IntSettingDesc {
+	typedef size_t OnConvert(const char *value); ///< callback prototype for conversion error
+
 	OneOfManySettingDesc(SaveLoad save, const char *name, SettingGuiFlag flags, OnGuiCtrl *guiproc, bool startup, const char *patx_name,
-		int32 def, int32 max, StringID str, StringID str_help, StringID str_val, SettingCategory cat, OnChange *proc,
+		int32 def, int32 max, StringID str, StringID str_help, StringID str_val, SettingCategory cat,
+		PreChangeCheck pre_check, PostChangeCallback post_callback,
 		std::initializer_list<const char *> many, OnConvert *many_cnvt) :
-		IntSettingDesc(save, name, flags, guiproc, startup, patx_name, def, 0, max, 0, str, str_help, str_val, cat, proc, nullptr), many_cnvt(many_cnvt)
+		IntSettingDesc(save, name, flags, guiproc, startup, patx_name, def, 0, max, 0, str, str_help, str_val, cat, pre_check, post_callback, nullptr), many_cnvt(many_cnvt)
 	{
 		for (auto one : many) this->many.push_back(one);
 	}
@@ -236,10 +259,11 @@ struct OneOfManySettingDesc : IntSettingDesc {
 /** Many of many setting. */
 struct ManyOfManySettingDesc : OneOfManySettingDesc {
 	ManyOfManySettingDesc(SaveLoad save, const char *name, SettingGuiFlag flags, OnGuiCtrl *guiproc, bool startup, const char *patx_name,
-		int32 def, StringID str, StringID str_help, StringID str_val, SettingCategory cat, OnChange *proc,
+		int32 def, StringID str, StringID str_help, StringID str_val, SettingCategory cat,
+		PreChangeCheck pre_check, PostChangeCallback post_callback,
 		std::initializer_list<const char *> many, OnConvert *many_cnvt) :
 		OneOfManySettingDesc(save, name, flags, guiproc, startup, patx_name, def, (1 << many.size()) - 1, str, str_help,
-			str_val, cat, proc, many, many_cnvt) {}
+			str_val, cat, pre_check, post_callback, many, many_cnvt) {}
 	virtual ~ManyOfManySettingDesc() {}
 
 	size_t ParseValue(const char *str) const override;
@@ -248,23 +272,43 @@ struct ManyOfManySettingDesc : OneOfManySettingDesc {
 
 /** String settings. */
 struct StringSettingDesc : SettingDesc {
+	/**
+	 * A check to be performed before the setting gets changed. The passed string may be
+	 * changed by the check if that is important, for example to remove unwanted white
+	 * space. The return value denotes whether the value, potentially after the changes,
+	 * is allowed to be used/set in the configuration.
+	 * @param value The prospective new value for the setting.
+	 * @return True when the setting is accepted.
+	 */
+	typedef bool PreChangeCheck(std::string &value);
+	/**
+	 * A callback to denote that a setting has been changed.
+	 * @param The new value for the setting.
+	 */
+	typedef void PostChangeCallback(const std::string &value);
+
 	StringSettingDesc(SaveLoad save, const char *name, SettingGuiFlag flags, OnGuiCtrl *guiproc, bool startup, const char *patx_name, const char *def,
-			uint32 max_length, OnChange proc) :
-		SettingDesc(save, name, flags, guiproc, startup, patx_name), def(def), max_length(max_length), proc(proc) {}
+			uint32 max_length, PreChangeCheck pre_check, PostChangeCallback post_callback) :
+		SettingDesc(save, name, flags, guiproc, startup, patx_name), def(def == nullptr ? "" : def), max_length(max_length),
+			pre_check(pre_check), post_callback(post_callback) {}
 	virtual ~StringSettingDesc() {}
 
-	const char *def;        ///< default value given when none is present
-	uint32 max_length;      ///< maximum length of the string, 0 means no maximum length
-	OnChange *proc;         ///< callback procedure for when the value is changed
+	std::string def;                   ///< Default value given when none is present
+	uint32 max_length;                 ///< Maximum length of the string, 0 means no maximum length
+	PreChangeCheck *pre_check;         ///< Callback to check for the validity of the setting.
+	PostChangeCallback *post_callback; ///< Callback when the setting has been changed.
 
 	bool IsStringSetting() const override { return true; }
-	void ChangeValue(const void *object, const char *newval) const;
-	void Write_ValidateSetting(const void *object, const char *str) const;
+	void ChangeValue(const void *object, std::string &newval) const;
 
 	void FormatValue(char *buf, const char *last, const void *object) const override;
 	void ParseValue(const IniItem *item, void *object) const override;
 	bool IsSameValue(const IniItem *item, void *object) const override;
 	const std::string &Read(const void *object) const;
+
+private:
+	void MakeValueValid(std::string &str) const;
+	void Write(const void *object, const std::string &str) const;
 };
 
 /** List/array settings. */
@@ -306,7 +350,7 @@ typedef std::initializer_list<std::unique_ptr<const SettingDesc>> SettingTable;
 
 const SettingDesc *GetSettingFromName(const char *name, bool ignore_version = false);
 bool SetSettingValue(const IntSettingDesc *sd, int32 value, bool force_newgame = false);
-bool SetSettingValue(const StringSettingDesc *sd, const char *value, bool force_newgame = false);
+bool SetSettingValue(const StringSettingDesc *sd, const std::string value, bool force_newgame = false);
 uint GetSettingIndex(const SettingDesc *sd);
 
 #endif /* SETTINGS_INTERNAL_H */

src/table/company_settings.ini

@@ -5,23 +5,20 @@
 ;
 
 [pre-amble]
-static bool CheckInterval(int32 p1);
-static bool InvalidateDetailsWindow(int32 p1);
-static bool UpdateIntervalTrains(int32 p1);
-static bool UpdateIntervalRoadVeh(int32 p1);
-static bool UpdateIntervalShips(int32 p1);
-static bool UpdateIntervalAircraft(int32 p1);
+static void UpdateServiceInterval(int32 new_value);
+static bool CanUpdateServiceInterval(VehicleType type, int32 &new_value);
+static void UpdateServiceInterval(VehicleType type, int32 new_value);
 
 static const SettingTable _company_settings{
 [post-amble]
 };
 [templates]
-SDT_BOOL = SDT_BOOL($base, $var,        $flags, $guiflags, $def,                        $str, $strhelp, $strval, $proc, $from, $to, $extver, $cat, $guiproc, $startup, $patxname),
-SDT_VAR  =  SDT_VAR($base, $var, $type, $flags, $guiflags, $def, $min, $max, $interval, $str, $strhelp, $strval, $proc, $from, $to, $extver, $cat, $guiproc, $startup, $patxname),
+SDT_BOOL = SDT_BOOL(CompanySettings, $var,        $flags, $guiflags, $def,                        $str, $strhelp, $strval, $pre_cb, $post_cb, $from, $to, $extver, $cat, $guiproc, $startup, $patxname),
+SDT_VAR  =  SDT_VAR(CompanySettings, $var, $type, $flags, $guiflags, $def, $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $from, $to, $extver, $cat, $guiproc, $startup, $patxname),
 SDT_NULL =  SDT_NULL($length, $from, $to, $extver),
 
 [validation]
-SDT_VAR = static_assert($max <= MAX_$type, "Maximum value for $base.$var exceeds storage size");
+SDT_VAR = static_assert($max <= MAX_$type, "Maximum value for CompanySettings.$var exceeds storage size");
 
 [defaults]
 flags    = 0
@@ -30,7 +27,8 @@ interval = 0
 str      = STR_NULL
 strhelp  = STR_CONFIG_SETTING_NO_EXPLANATION_AVAILABLE_HELPTEXT
 strval   = STR_NULL
-proc     = nullptr
+pre_cb   = nullptr
+post_cb  = nullptr
 guiproc  = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION
@@ -43,7 +41,6 @@ patxname = nullptr
 
 
 [SDT_BOOL]
-base     = CompanySettings
 var      = engine_renew
 def      = true
 str      = STR_CONFIG_SETTING_AUTORENEW_VEHICLE
@@ -51,7 +48,6 @@ strhelp  = STR_CONFIG_SETTING_AUTORENEW_VEHICLE_HELPTEXT
 cat      = SC_BASIC
 
 [SDT_VAR]
-base     = CompanySettings
 var      = engine_renew_months
 type     = SLE_INT16
 guiflags = SGF_PER_COMPANY | SGF_DISPLAY_ABS
@@ -63,7 +59,6 @@ strhelp  = STR_CONFIG_SETTING_AUTORENEW_MONTHS_HELPTEXT
 strval   = STR_CONFIG_SETTING_AUTORENEW_MONTHS_VALUE_BEFORE
 
 [SDT_VAR]
-base     = CompanySettings
 var      = engine_renew_money
 type     = SLE_UINT
 guiflags = SGF_PER_COMPANY | SGF_CURRENCY
@@ -75,7 +70,6 @@ strhelp  = STR_CONFIG_SETTING_AUTORENEW_MONEY_HELPTEXT
 strval   = STR_JUST_CURRENCY_LONG
 
 [SDT_BOOL]
-base     = CompanySettings
 var      = renew_keep_length
 def      = false
 
@@ -85,15 +79,13 @@ length   = 1
 extver   = SlXvFeatureTest(XSLFTO_AND, XSLFI_SPRINGPP, 2)
 
 [SDT_BOOL]
-base     = CompanySettings
 var      = vehicle.servint_ispercent
 def      = false
 str      = STR_CONFIG_SETTING_SERVINT_ISPERCENT
 strhelp  = STR_CONFIG_SETTING_SERVINT_ISPERCENT_HELPTEXT
-proc     = CheckInterval
+post_cb  = UpdateServiceInterval
 
 [SDT_VAR]
-base     = CompanySettings
 var      = vehicle.servint_trains
 type     = SLE_UINT16
 guiflags = SGF_PER_COMPANY | SGF_0ISDISABLED
@@ -103,10 +95,10 @@ max      = 800
 str      = STR_CONFIG_SETTING_SERVINT_TRAINS
 strhelp  = STR_CONFIG_SETTING_SERVINT_TRAINS_HELPTEXT
 strval   = STR_CONFIG_SETTING_SERVINT_VALUE
-proc     = UpdateIntervalTrains
+pre_cb   = [](auto new_value) { return CanUpdateServiceInterval(VEH_TRAIN, new_value); }
+post_cb  = [](auto new_value) { UpdateServiceInterval(VEH_TRAIN, new_value); }
 
 [SDT_VAR]
-base     = CompanySettings
 var      = vehicle.servint_roadveh
 type     = SLE_UINT16
 guiflags = SGF_PER_COMPANY | SGF_0ISDISABLED
@@ -116,10 +108,10 @@ max      = 800
 str      = STR_CONFIG_SETTING_SERVINT_ROAD_VEHICLES
 strhelp  = STR_CONFIG_SETTING_SERVINT_ROAD_VEHICLES_HELPTEXT
 strval   = STR_CONFIG_SETTING_SERVINT_VALUE
-proc     = UpdateIntervalRoadVeh
+pre_cb   = [](auto new_value) { return CanUpdateServiceInterval(VEH_ROAD, new_value); }
+post_cb  = [](auto new_value) { UpdateServiceInterval(VEH_ROAD, new_value); }
 
 [SDT_VAR]
-base     = CompanySettings
 var      = vehicle.servint_ships
 type     = SLE_UINT16
 guiflags = SGF_PER_COMPANY | SGF_0ISDISABLED
@@ -129,10 +121,10 @@ max      = 800
 str      = STR_CONFIG_SETTING_SERVINT_SHIPS
 strhelp  = STR_CONFIG_SETTING_SERVINT_SHIPS_HELPTEXT
 strval   = STR_CONFIG_SETTING_SERVINT_VALUE
-proc     = UpdateIntervalShips
+pre_cb   = [](auto new_value) { return CanUpdateServiceInterval(VEH_SHIP, new_value); }
+post_cb  = [](auto new_value) { UpdateServiceInterval(VEH_SHIP, new_value); }
 
 [SDT_VAR]
-base     = CompanySettings
 var      = vehicle.servint_aircraft
 type     = SLE_UINT16
 guiflags = SGF_PER_COMPANY | SGF_0ISDISABLED
@@ -142,7 +134,8 @@ max      = 800
 str      = STR_CONFIG_SETTING_SERVINT_AIRCRAFT
 strhelp  = STR_CONFIG_SETTING_SERVINT_AIRCRAFT_HELPTEXT
 strval   = STR_CONFIG_SETTING_SERVINT_VALUE
-proc     = UpdateIntervalAircraft
+pre_cb   = [](auto new_value) { return CanUpdateServiceInterval(VEH_AIRCRAFT, new_value); }
+post_cb  = [](auto new_value) { UpdateServiceInterval(VEH_AIRCRAFT, new_value); }
 
 [SDT_BOOL]
 base     = CompanySettings

src/table/currency_settings.ini

@@ -9,11 +9,11 @@ static const SettingTable _currency_settings{
 [post-amble]
 };
 [templates]
-SDT_VAR  = SDT_VAR ($base, $var, $type, $flags, $guiflags, $def, $min, $max, $interval, $str, $strhelp, $strval, $proc, $from, $to, $extver, $cat, $guiproc, $startup, nullptr),
-SDT_SSTR = SDT_SSTR($base, $var, $type, $flags, $guiflags, $def,                                                 $proc, $from, $to, $extver, $cat, $guiproc, $startup, nullptr),
+SDT_VAR  = SDT_VAR (CurrencySpec, $var, $type, $flags, $guiflags, $def, $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $from, $to, $extver, $cat, $guiproc, $startup, nullptr),
+SDT_SSTR = SDT_SSTR(CurrencySpec, $var, $type, $flags, $guiflags, $def,                                                 $pre_cb, $post_cb, $from, $to, $extver, $cat, $guiproc, $startup, nullptr),
 
 [validation]
-SDT_VAR = static_assert($max <= MAX_$type, "Maximum value for $base.$var exceeds storage size");
+SDT_VAR = static_assert($max <= MAX_$type, "Maximum value for CurrencySpec.$var exceeds storage size");
 
 [defaults]
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
@@ -22,7 +22,8 @@ interval = 0
 str      = STR_NULL
 strhelp  = STR_CONFIG_SETTING_NO_EXPLANATION_AVAILABLE_HELPTEXT
 strval   = STR_NULL
-proc     = nullptr
+pre_cb   = nullptr
+post_cb  = nullptr
 guiproc  = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION
@@ -34,7 +35,6 @@ extver   = SlXvFeatureTest()
 
 
 [SDT_VAR]
-base     = CurrencySpec
 var      = rate
 type     = SLE_UINT16
 def      = 1
@@ -42,14 +42,12 @@ min      = 0
 max      = UINT16_MAX
 
 [SDT_SSTR]
-base     = CurrencySpec
 var      = separator
 type     = SLE_STRQ
 def      = "".""
 cat      = SC_BASIC
 
 [SDT_VAR]
-base     = CurrencySpec
 var      = to_euro
 type     = SLE_INT32
 def      = 0
@@ -57,13 +55,11 @@ min      = MIN_YEAR
 max      = MAX_YEAR
 
 [SDT_SSTR]
-base     = CurrencySpec
 var      = prefix
 type     = SLE_STRQ
 def      = nullptr
 
 [SDT_SSTR]
-base     = CurrencySpec
 var      = suffix
 type     = SLE_STRQ
 def      = "" credits""

src/table/gameopt_settings.ini

@@ -37,20 +37,20 @@ static const SettingTable _gameopt_settings{
 [post-amble]
 };
 [templates]
-SDTG_LIST    =  SDTG_LIST($name,       $type, $flags, $guiflags, $var, $def, $length,                                                $from, $to, $extver,        $cat, $guiproc, $startup, nullptr),
-SDTG_VAR     =   SDTG_VAR($name,       $type, $flags, $guiflags, $var, $def, $min, $max, $interval,  $str, $strhelp, $strval, $proc, $from, $to, $extver,        $cat, $guiproc, $startup, nullptr),
-SDT_NULL     =   SDT_NULL(                                                   $length,                                                $from, $to, $extver),
-SDTC_OMANY   = SDTC_OMANY(       $var, $type, $flags, $guiflags, $def,       $max, $full,            $str, $strhelp, $strval, $proc, $from, $to, $extver,        $cat, $guiproc, $startup, nullptr),
-SDTG_OMANY   = SDTG_OMANY($name,       $type, $flags, $guiflags, $var, $def, $max, $full,            $str, $strhelp, $strval, $proc, $from, $to, $extver,        $cat, $guiproc, $startup, nullptr),
-SDT_OMANY    =  SDT_OMANY($base, $var, $type, $flags, $guiflags, $def,       $max, $full,            $str, $strhelp, $strval, $proc, $from, $to, $extver, $load, $cat, $guiproc, $startup, nullptr),
-SDT_VAR      =    SDT_VAR($base, $var, $type, $flags, $guiflags, $def, $min, $max,        $interval, $str, $strhelp, $strval, $proc, $from, $to, $extver,        $cat, $guiproc, $startup, nullptr),
+SDTG_LIST    =  SDTG_LIST($name,              $type, $flags, $guiflags, $var, $def, $length,                                                            $from, $to, $extver,        $cat, $guiproc, $startup, nullptr),
+SDTG_VAR     =   SDTG_VAR($name,              $type, $flags, $guiflags, $var, $def, $min, $max, $interval,  $str, $strhelp, $strval, $pre_cb, $post_cb, $from, $to, $extver,        $cat, $guiproc, $startup, nullptr),
+SDT_NULL     =   SDT_NULL(                                                          $length,                                                            $from, $to, $extver),
+SDTC_OMANY   = SDTC_OMANY(              $var, $type, $flags, $guiflags, $def,       $max, $full,            $str, $strhelp, $strval, $pre_cb, $post_cb, $from, $to, $extver,        $cat, $guiproc, $startup, nullptr),
+SDTG_OMANY   = SDTG_OMANY($name,              $type, $flags, $guiflags, $var, $def, $max, $full,            $str, $strhelp, $strval, $pre_cb, $post_cb, $from, $to, $extver,        $cat, $guiproc, $startup, nullptr),
+SDT_OMANY    =  SDT_OMANY(GameSettings, $var, $type, $flags, $guiflags, $def,       $max, $full,            $str, $strhelp, $strval, $pre_cb, $post_cb, $from, $to, $extver, $load, $cat, $guiproc, $startup, nullptr),
+SDT_VAR      =    SDT_VAR(GameSettings, $var, $type, $flags, $guiflags, $def, $min, $max,        $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $from, $to, $extver,        $cat, $guiproc, $startup, nullptr),
 
 [validation]
 SDTG_VAR = static_assert($max <= MAX_$type, "Maximum value for $var exceeds storage size");
 SDTG_OMANY = static_assert($max <= MAX_$type, "Maximum value for $var exceeds storage size");
 SDTC_OMANY = static_assert($max <= MAX_$type, "Maximum value for $var exceeds storage size");
-SDT_OMANY = static_assert($max <= MAX_$type, "Maximum value for $base.$var exceeds storage size");
-SDT_VAR = static_assert($max <= MAX_$type, "Maximum value for $base.$var exceeds storage size");
+SDT_OMANY = static_assert($max <= MAX_$type, "Maximum value for GameSettings.$var exceeds storage size");
+SDT_VAR = static_assert($max <= MAX_$type, "Maximum value for GameSettings.$var exceeds storage size");
 
 [defaults]
 flags    = 0
@@ -59,7 +59,8 @@ interval = 0
 str      = STR_NULL
 strhelp  = STR_CONFIG_SETTING_NO_EXPLANATION_AVAILABLE_HELPTEXT
 strval   = STR_NULL
-proc     = nullptr
+pre_cb   = nullptr
+post_cb  = nullptr
 guiproc  = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION
@@ -105,7 +106,6 @@ max      = SP_CUSTOM
 cat      = SC_BASIC
 
 [SDT_OMANY]
-base     = GameSettings
 var      = locale.currency
 type     = SLE_UINT8
 flags    = SLF_NO_NETWORK_SYNC
@@ -127,7 +127,6 @@ cat      = SC_BASIC
 # There are only 21 predefined town_name values (0-20), but you can have more with newgrf action F so allow
 # these bigger values (21-255). Invalid values will fallback to english on use and (undefined string) in GUI.
 [SDT_OMANY]
-base     = GameSettings
 var      = game_creation.town_name
 type     = SLE_UINT8
 def      = 0
@@ -136,7 +135,6 @@ full     = _town_names
 cat      = SC_BASIC
 
 [SDT_OMANY]
-base     = GameSettings
 var      = game_creation.landscape
 type     = SLE_UINT8
 def      = 0
@@ -146,7 +144,6 @@ load     = ConvertLandscape
 cat      = SC_BASIC
 
 [SDT_VAR]
-base     = GameSettings
 var      = game_creation.snow_line_height
 type     = SLE_UINT8
 def      = DEF_SNOWLINE_HEIGHT * TILE_HEIGHT
@@ -180,7 +177,6 @@ full     = _autosave_interval
 cat      = SC_BASIC
 
 [SDT_OMANY]
-base     = GameSettings
 var      = vehicle.road_side
 type     = SLE_UINT8
 def      = 1

src/table/misc_settings.ini

@@ -22,12 +22,12 @@ static const SettingTable _misc_settings{
 [post-amble]
 };
 [templates]
-SDTG_LIST  =  SDTG_LIST($name, $type, $flags, $guiflags, $var, $def,       $length,                                                $from, $to, $extver, $cat, $guiproc, $startup, nullptr),
-SDTG_MMANY = SDTG_MMANY($name, $type, $flags, $guiflags, $var, $def,                        $full, $str, $strhelp, $strval, $proc, $from, $to, $extver, $cat, $guiproc, $startup, nullptr),
-SDTG_OMANY = SDTG_OMANY($name, $type, $flags, $guiflags, $var, $def,       $max,            $full, $str, $strhelp, $strval, $proc, $from, $to, $extver, $cat, $guiproc, $startup, nullptr),
-SDTG_SSTR  =  SDTG_SSTR($name, $type, $flags, $guiflags, $var, $def,       0,                                               $proc, $from, $to, $extver, $cat, $guiproc, $startup, nullptr),
-SDTG_BOOL  =  SDTG_BOOL($name,        $flags, $guiflags, $var, $def,                               $str, $strhelp, $strval, $proc, $from, $to, $extver, $cat, $guiproc, $startup, nullptr),
-SDTG_VAR   =   SDTG_VAR($name, $type, $flags, $guiflags, $var, $def, $min, $max, $interval,        $str, $strhelp, $strval, $proc, $from, $to, $extver, $cat, $guiproc, $startup, nullptr),
+SDTG_LIST  =  SDTG_LIST($name, $type, $flags, $guiflags, $var, $def,       $length,                                                            $from, $to, $extver, $cat, $guiproc, $startup, nullptr),
+SDTG_MMANY = SDTG_MMANY($name, $type, $flags, $guiflags, $var, $def,                        $full, $str, $strhelp, $strval, $pre_cb, $post_cb, $from, $to, $extver, $cat, $guiproc, $startup, nullptr),
+SDTG_OMANY = SDTG_OMANY($name, $type, $flags, $guiflags, $var, $def,       $max,            $full, $str, $strhelp, $strval, $pre_cb, $post_cb, $from, $to, $extver, $cat, $guiproc, $startup, nullptr),
+SDTG_SSTR  =  SDTG_SSTR($name, $type, $flags, $guiflags, $var, $def,       0,                                               $pre_cb, $post_cb, $from, $to, $extver, $cat, $guiproc, $startup, nullptr),
+SDTG_BOOL  =  SDTG_BOOL($name,        $flags, $guiflags, $var, $def,                               $str, $strhelp, $strval, $pre_cb, $post_cb, $from, $to, $extver, $cat, $guiproc, $startup, nullptr),
+SDTG_VAR   =   SDTG_VAR($name, $type, $flags, $guiflags, $var, $def, $min, $max, $interval,        $str, $strhelp, $strval, $pre_cb, $post_cb, $from, $to, $extver, $cat, $guiproc, $startup, nullptr),
 
 [validation]
 SDTG_VAR = static_assert($max <= MAX_$type, "Maximum value for $var exceeds storage size");
@@ -40,7 +40,8 @@ interval = 0
 str      = STR_NULL
 strhelp  = STR_CONFIG_SETTING_NO_EXPLANATION_AVAILABLE_HELPTEXT
 strval   = STR_NULL
-proc     = nullptr
+pre_cb   = nullptr
+post_cb  = nullptr
 guiproc  = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION

src/table/settings.h.preamble

@@ -58,67 +58,67 @@ static size_t ConvertLandscape(const char *value);
 
 /* Macros for various objects to go in the configuration file.
  * This section is for global variables */
-#define SDTG_VAR(name, type, flags, guiflags, var, def, min, max, interval, str, strhelp, strval, proc, from, to, extver, cat, guiproc, startup, patxname)\
-	NSD(Int, SLEG_GENERAL_X(SL_VAR, var, type | flags, 1, from, to, extver), name, guiflags, guiproc, startup, patxname, def, min, max, interval, str, strhelp, strval, cat, proc, nullptr)
+#define SDTG_VAR(name, type, flags, guiflags, var, def, min, max, interval, str, strhelp, strval, pre_check, post_callback, from, to, extver, cat, guiproc, startup, patxname)\
+	NSD(Int, SLEG_GENERAL_X(SL_VAR, var, type | flags, 1, from, to, extver), name, guiflags, guiproc, startup, patxname, def, min, max, interval, str, strhelp, strval, cat, pre_check, post_callback, nullptr)
 
-#define SDTG_BOOL(name, flags, guiflags, var, def, str, strhelp, strval, proc, from, to, extver, cat, guiproc, startup, patxname)\
-	NSD(Bool, SLEG_GENERAL_X(SL_VAR, var, SLE_BOOL | flags, 1, from, to, extver), name, guiflags, guiproc, startup, patxname, def, str, strhelp, strval, cat, proc)
+#define SDTG_BOOL(name, flags, guiflags, var, def, str, strhelp, strval, pre_check, post_callback, from, to, extver, cat, guiproc, startup, patxname)\
+	NSD(Bool, SLEG_GENERAL_X(SL_VAR, var, SLE_BOOL | flags, 1, from, to, extver), name, guiflags, guiproc, startup, patxname, def, str, strhelp, strval, cat, pre_check, post_callback)
 
 #define SDTG_LIST(name, type, flags, guiflags, var, def, length, from, to, extver, cat, guiproc, startup, patxname)\
 	NSD(List, SLEG_GENERAL_X(SL_ARR, var, type | flags, length, from, to, extver), name, guiflags, guiproc, startup, patxname, def)
 
-#define SDTG_SSTR(name, type, flags, guiflags, var, def, max_length, proc, from, to, extver, cat, guiproc, startup, patxname)\
-	NSD(String, SLEG_GENERAL_X(SL_STDSTR, var, type | flags, sizeof(var), from, to, extver), name, guiflags, guiproc, startup, patxname, def, max_length, proc)
+#define SDTG_SSTR(name, type, flags, guiflags, var, def, max_length, pre_check, post_callback, from, to, extver, cat, guiproc, startup, patxname)\
+	NSD(String, SLEG_GENERAL_X(SL_STDSTR, var, type | flags, sizeof(var), from, to, extver), name, guiflags, guiproc, startup, patxname, def, max_length, pre_check, post_callback)
 
-#define SDTG_OMANY(name, type, flags, guiflags, var, def, max, full, str, strhelp, strval, proc, from, to, extver, cat, guiproc, startup, patxname)\
-	NSD(OneOfMany, SLEG_GENERAL_X(SL_VAR, var, type | flags, 1, from, to, extver), name, guiflags, guiproc, startup, patxname, def, max, str, strhelp, strval, cat, proc, full, nullptr)
+#define SDTG_OMANY(name, type, flags, guiflags, var, def, max, full, str, strhelp, strval, pre_check, post_callback, from, to, extver, cat, guiproc, startup, patxname)\
+	NSD(OneOfMany, SLEG_GENERAL_X(SL_VAR, var, type | flags, 1, from, to, extver), name, guiflags, guiproc, startup, patxname, def, max, str, strhelp, strval, cat, pre_check, post_callback, full, nullptr)
 
-#define SDTG_MMANY(name, type, flags, guiflags, var, def, full, str, strhelp, strval, proc, from, to, extver, cat, guiproc, startup, patxname)\
-	NSD(ManyOfMany, SLEG_GENERAL_X(SL_VAR, var, type | flags, 1, from, to, extver), name, guiflags, guiproc, startup, patxname, def, str, strhelp, strval, cat, proc, full, nullptr)
+#define SDTG_MMANY(name, type, flags, guiflags, var, def, full, str, strhelp, strval, pre_check, post_callback, from, to, extver, cat, guiproc, startup, patxname)\
+	NSD(ManyOfMany, SLEG_GENERAL_X(SL_VAR, var, type | flags, 1, from, to, extver), name, guiflags, guiproc, startup, patxname, def, str, strhelp, strval, cat, pre_check, post_callback, full, nullptr)
 
 #define SDTG_NULL(length, from, to, extver)\
 	NSD(Null, SLE_CONDNULL_X(length, from, to, extver))
 
 /* Macros for various objects to go in the configuration file.
  * This section is for structures where their various members are saved */
-#define SDT_VAR(base, var, type, flags, guiflags, def, min, max, interval, str, strhelp, strval, proc, from, to, extver, cat, guiproc, startup, patxname)\
-	NSD(Int, SLE_GENERAL_X(SL_VAR, base, var, type | flags, 1, from, to, extver), #var, guiflags, guiproc, startup, patxname, def, min, max, interval, str, strhelp, strval, cat, proc, nullptr)
+#define SDT_VAR(base, var, type, flags, guiflags, def, min, max, interval, str, strhelp, strval, pre_check, post_callback, from, to, extver, cat, guiproc, startup, patxname)\
+	NSD(Int, SLE_GENERAL_X(SL_VAR, base, var, type | flags, 1, from, to, extver), #var, guiflags, guiproc, startup, patxname, def, min, max, interval, str, strhelp, strval, cat, pre_check, post_callback, nullptr)
 
-#define SDT_ENUM(base, var, type, flags, guiflags, def, str, strhelp, proc, from, to, extver, cat, guiproc, startup, patxname, enumlist)\
-	NSD(Int, SLE_GENERAL_X(SL_VAR, base, var, type | flags, 1, from, to, extver), #var, guiflags | SGF_ENUM, guiproc, startup, patxname, def, 0, 0, 0, str, strhelp, STR_NULL, cat, proc, enumlist)
+#define SDT_ENUM(base, var, type, flags, guiflags, def, str, strhelp, pre_check, post_callback, from, to, extver, cat, guiproc, startup, patxname, enumlist)\
+	NSD(Int, SLE_GENERAL_X(SL_VAR, base, var, type | flags, 1, from, to, extver), #var, guiflags | SGF_ENUM, guiproc, startup, patxname, def, 0, 0, 0, str, strhelp, STR_NULL, cat, pre_check, post_callback, enumlist)
 
-#define SDT_BOOL(base, var, flags, guiflags, def, str, strhelp, strval, proc, from, to, extver, cat, guiproc, startup, patxname)\
-	NSD(Bool, SLE_GENERAL_X(SL_VAR, base, var, SLE_BOOL | flags, 1, from, to, extver), #var, guiflags, guiproc, startup, patxname, def, str, strhelp, strval, cat, proc)
+#define SDT_BOOL(base, var, flags, guiflags, def, str, strhelp, strval, pre_check, post_callback, from, to, extver, cat, guiproc, startup, patxname)\
+	NSD(Bool, SLE_GENERAL_X(SL_VAR, base, var, SLE_BOOL | flags, 1, from, to, extver), #var, guiflags, guiproc, startup, patxname, def, str, strhelp, strval, cat, pre_check, post_callback)
 
 #define SDT_LIST(base, var, type, flags, guiflags, def, from, to, extver, cat, guiproc, startup, patxname)\
 	NSD(List, SLE_GENERAL_X(SL_ARR, base, var, type | flags, lengthof(((base*)8)->var), from, to, extver), #var, guiflags, guiproc, startup, patxname, def)
 
-#define SDT_SSTR(base, var, type, flags, guiflags, def, proc, from, to, extver, cat, guiproc, startup, patxname)\
-	NSD(String, SLE_GENERAL_X(SL_STDSTR, base, var, type | flags, sizeof(((base*)8)->var), from, to, extver), #var, guiflags, guiproc, startup, patxname, def, 0, proc)
+#define SDT_SSTR(base, var, type, flags, guiflags, def, pre_check, post_callback, from, to, extver, cat, guiproc, startup, patxname)\
+	NSD(String, SLE_GENERAL_X(SL_STDSTR, base, var, type | flags, sizeof(((base*)8)->var), from, to, extver), #var, guiflags, guiproc, startup, patxname, def, 0, pre_check, post_callback)
 
-#define SDT_OMANY(base, var, type, flags, guiflags, def, max, full, str, strhelp, strval, proc, from, to, extver, load, cat, guiproc, startup, patxname)\
-	NSD(OneOfMany, SLE_GENERAL_X(SL_VAR, base, var, type | flags, 1, from, to, extver), #var, guiflags, guiproc, startup, patxname, def, max, str, strhelp, strval, cat, proc, full, load)
+#define SDT_OMANY(base, var, type, flags, guiflags, def, max, full, str, strhelp, strval, pre_check, post_callback, from, to, extver, load, cat, guiproc, startup, patxname)\
+	NSD(OneOfMany, SLE_GENERAL_X(SL_VAR, base, var, type | flags, 1, from, to, extver), #var, guiflags, guiproc, startup, patxname, def, max, str, strhelp, strval, cat, pre_check, post_callback, full, load)
 
-#define SDT_MMANY(base, var, type, flags, guiflags, def, full, str, proc, strhelp, strval, from, to, extver, cat, guiproc, startup, patxname)\
-	NSD(ManyOfMany, SLE_GENERAL_X(SL_VAR, base, var, type | flags, 1, from, to, extver), #var, guiflags, guiproc, startup, patxname, def, str, strhelp, strval, cat, proc, full, nullptr)
+#define SDT_MMANY(base, var, type, flags, guiflags, def, full, str, pre_check, post_callback, strhelp, strval, from, to, extver, cat, guiproc, startup, patxname)\
+	NSD(ManyOfMany, SLE_GENERAL_X(SL_VAR, base, var, type | flags, 1, from, to, extver), #var, guiflags, guiproc, startup, patxname, def, str, strhelp, strval, cat, pre_check, post_callback, full, nullptr)
 
 #define SDT_NULL(length, from, to, extver)\
 	NSD(Null, SLE_CONDNULL_X(length, from, to, extver))
 
-#define SDTC_VAR(var, type, flags, guiflags, def, min, max, interval, str, strhelp, strval, proc, from, to, extver, cat, guiproc, startup, patxname)\
-	SDTG_VAR(#var, type, flags, guiflags, _settings_client.var, def, min, max, interval, str, strhelp, strval, proc, from, to, extver, cat, guiproc, startup, patxname)
+#define SDTC_VAR(var, type, flags, guiflags, def, min, max, interval, str, strhelp, strval, pre_check, post_callback, from, to, extver, cat, guiproc, startup, patxname)\
+	SDTG_VAR(#var, type, flags, guiflags, _settings_client.var, def, min, max, interval, str, strhelp, strval, pre_check, post_callback, from, to, extver, cat, guiproc, startup, patxname)
 
-#define SDTC_BOOL(var, flags, guiflags, def, str, strhelp, strval, proc, from, to, extver, cat, guiproc, startup, patxname)\
-	SDTG_BOOL(#var, flags, guiflags, _settings_client.var, def, str, strhelp, strval, proc, from, to, extver, cat, guiproc, startup, patxname)
+#define SDTC_BOOL(var, flags, guiflags, def, str, strhelp, strval, pre_check, post_callback, from, to, extver, cat, guiproc, startup, patxname)\
+	SDTG_BOOL(#var, flags, guiflags, _settings_client.var, def, str, strhelp, strval, pre_check, post_callback, from, to, extver, cat, guiproc, startup, patxname)
 
 #define SDTC_LIST(var, type, flags, guiflags, def, from, to, extver, cat, guiproc, startup, patxname)\
 	SDTG_LIST(#var, type, flags, guiflags, _settings_client.var, def, lengthof(_settings_client.var), from, to, extver, cat, guiproc, startup, patxname)
 
-#define SDTC_SSTR(var, type, flags, guiflags, def, max_length, proc, from, to, extver, cat, guiproc, startup, patxname)\
-	SDTG_SSTR(#var, type, flags, guiflags, _settings_client.var, def, max_length, proc, from, to, extver, cat, guiproc, startup, patxname)\
+#define SDTC_SSTR(var, type, flags, guiflags, def, max_length, pre_check, post_callback, from, to, extver, cat, guiproc, startup, patxname)\
+	SDTG_SSTR(#var, type, flags, guiflags, _settings_client.var, def, max_length, pre_check, post_callback, from, to, extver, cat, guiproc, startup, patxname)\
 
-#define SDTC_OMANY(var, type, flags, guiflags, def, max, full, str, strhelp, strval, proc, from, to, extver, cat, guiproc, startup, patxname)\
-	SDTG_OMANY(#var, type, flags, guiflags, _settings_client.var, def, max, full, str, strhelp, strval, proc, from, to, extver, cat, guiproc, startup, patxname)
+#define SDTC_OMANY(var, type, flags, guiflags, def, max, full, str, strhelp, strval, pre_check, post_callback, from, to, extver, cat, guiproc, startup, patxname)\
+	SDTG_OMANY(#var, type, flags, guiflags, _settings_client.var, def, max, full, str, strhelp, strval, pre_check, post_callback, from, to, extver, cat, guiproc, startup, patxname)
 
 #define SDT_XREF(from, to, extver, xref, xrefcvt)\
 	NSD(Xref, SLE_CONDNULL_X(0, from, to, extver), SettingsXref(xref, xrefcvt))

src/table/win32_settings.ini

@@ -14,8 +14,8 @@ static const SettingTable _win32_settings{
 };
 #endif /* _WIN32 */
 [templates]
-SDTG_BOOL = SDTG_BOOL($name,        $flags, $guiflags, $var, $def,                        $str, $strhelp, $strval, $proc, $from, $to, $cat, $guiproc, $startup, $extver, nullptr),
-SDTG_VAR  =  SDTG_VAR($name, $type, $flags, $guiflags, $var, $def, $min, $max, $interval, $str, $strhelp, $strval, $proc, $from, $to, $cat, $guiproc, $startup, $extver, nullptr),
+SDTG_BOOL = SDTG_BOOL($name,        $flags, $guiflags, $var, $def,                        $str, $strhelp, $strval, $pre_cb, $post_cb, $from, $to, $cat, $guiproc, $startup, $extver, nullptr),
+SDTG_VAR  =  SDTG_VAR($name, $type, $flags, $guiflags, $var, $def, $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $from, $to, $cat, $guiproc, $startup, $extver, nullptr),
 
 [validation]
 SDTG_VAR = static_assert($max <= MAX_$type, "Maximum value for $var exceeds storage size");
@@ -27,7 +27,8 @@ interval = 0
 str      = STR_NULL
 strhelp  = STR_CONFIG_SETTING_NO_EXPLANATION_AVAILABLE_HELPTEXT
 strval   = STR_NULL
-proc     = nullptr
+pre_cb   = nullptr
+post_cb  = nullptr
 guiproc  = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION

src/table/window_settings.ini

@@ -10,21 +10,21 @@ static const SettingTable _window_settings{
 [post-amble]
 };
 [templates]
-SDT_BOOL = SDT_BOOL($base, $var,        $flags, $guiflags, $def,                        $str, $strhelp, $strval, $proc, $from, $to, $extver, $cat, $guiproc, $startup, nullptr),
-SDT_VAR  =  SDT_VAR($base, $var, $type, $flags, $guiflags, $def, $min, $max, $interval, $str, $strhelp, $strval, $proc, $from, $to, $extver, $cat, $guiproc, $startup, nullptr),
+SDT_BOOL = SDT_BOOL(WindowDesc, $var,        $flags, $guiflags, $def,                        $str, $strhelp, $strval, $pre_cb, $post_cb, $from, $to, $extver, $cat, $guiproc, $startup, nullptr),
+SDT_VAR  =  SDT_VAR(WindowDesc, $var, $type, $flags, $guiflags, $def, $min, $max, $interval, $str, $strhelp, $strval, $pre_cb, $post_cb, $from, $to, $extver, $cat, $guiproc, $startup, nullptr),
 
 [validation]
-SDT_VAR = static_assert($max <= MAX_$type, "Maximum value for $base.$var exceeds storage size");
+SDT_VAR = static_assert($max <= MAX_$type, "Maximum value for WindowDesc.$var exceeds storage size");
 
 [defaults]
-base     = WindowDesc
 flags    = SLF_NOT_IN_SAVE | SLF_NO_NETWORK_SYNC
 guiflags = SGF_NONE
 interval = 0
 str      = STR_NULL
 strhelp  = STR_CONFIG_SETTING_NO_EXPLANATION_AVAILABLE_HELPTEXT
 strval   = STR_NULL
-proc     = nullptr
+pre_cb   = nullptr
+post_cb  = nullptr
 guiproc  = nullptr
 load     = nullptr
 from     = SL_MIN_VERSION