G_DirtyGameData: Dirty bit only applied in I_Error and signal handlers, nowhere else

- Unfortunately, the way this system previously worked, the unlock was given to you for free if you accidentially opened two copies of the game at once.
- Instead, open the file in r+ mode, shimmy along 5 bytes, and write a `true` to be read later.
- Far more memory safe than rewriting the entire gamedata out on crash.

ALSO:
- crashflags has been split into boolean evercrashed and UINT8 musicflags.
    - We don't need to track if the LAST session was a crash, at least not right now.
    - Opens the floor up to other music like Loser Club happening on the Challenges menu.

src/d_main.c

@@ -1051,7 +1051,7 @@ void D_ClearState(void)
 	cursongcredit.def = NULL;
 
 	if (gamedata && gamedata->deferredsave)
-		G_SaveGameData(true);
+		G_SaveGameData();
 
 	G_SetGamestate(GS_NULL);
 	wipegamestate = GS_NULL;

src/deh_soc.c

@@ -2931,7 +2931,7 @@ void readmaincfg(MYFILE *f, boolean mainfile)
 				if (!GoodDataFileName(word2))
 					I_Error("Maincfg: bad data file name '%s'\n", word2);
 
-				G_SaveGameData(false); // undirty your old gamedata
+				G_SaveGameData();
 				strlcpy(gamedatafilename, word2, sizeof (gamedatafilename));
 				strlwr(gamedatafilename);
 				savemoddata = true;

src/f_finale.c

@@ -1084,7 +1084,7 @@ void F_GameEvaluationTicker(void)
 			++gamedata->timesBeaten;
 
 			M_UpdateUnlockablesAndExtraEmblems(true, true);
-			G_SaveGameData(true);
+			G_SaveGameData();
 		}
 		else
 		{

src/g_demo.c

@@ -4196,7 +4196,7 @@ void G_SaveDemo(void)
 			{
 				gamedata->eversavedreplay = true;
 				M_UpdateUnlockablesAndExtraEmblems(true, true);
-				G_SaveGameData(true);
+				G_SaveGameData();
 			}
 		}
 		else

src/g_game.c

@@ -3834,7 +3834,7 @@ static void G_UpdateVisited(void)
 		CONS_Printf(M_GetText("\x82" "Earned %hu emblem%s for level completion.\n"), (UINT16)earnedEmblems, earnedEmblems > 1 ? "s" : "");
 
 	M_UpdateUnlockablesAndExtraEmblems(true, true);
-	G_SaveGameData(true);
+	G_SaveGameData();
 }
 
 static boolean CanSaveLevel(INT32 mapnum)
@@ -3926,7 +3926,7 @@ static void G_GetNextMap(void)
 						{
 							gamedata->everseenspecial = true;
 							M_UpdateUnlockablesAndExtraEmblems(true, true);
-							G_SaveGameData(true);
+							G_SaveGameData();
 						}
 					}
 				}
@@ -4161,7 +4161,7 @@ static void G_DoCompleted(void)
 	}
 
 	if (gamedata->deferredsave)
-		G_SaveGameData(true);
+		G_SaveGameData();
 
 	legitimateexit = false;
 
@@ -4567,6 +4567,11 @@ void G_LoadGameData(void)
 		gridunusable = true;
 	}
 
+	if (versionMinor > 1)
+	{
+		gamedata->evercrashed = (boolean)READUINT8(save.p);
+	}
+
 	gamedata->totalplaytime = READUINT32(save.p);
 
 	if (versionMinor > 1)
@@ -4583,10 +4588,6 @@ void G_LoadGameData(void)
 		gamedata->keyspending = READUINT8(save.p);
 		gamedata->chaokeys = READUINT16(save.p);
 
-		gamedata->crashflags = READUINT8(save.p);
-		if (gamedata->crashflags & GDCRASH_LAST)
-			gamedata->crashflags |= GDCRASH_ANY;
-
 		gamedata->everloadedaddon = (boolean)READUINT8(save.p);
 		gamedata->eversavedreplay = (boolean)READUINT8(save.p);
 		gamedata->everseenspecial = (boolean)READUINT8(save.p);
@@ -4782,9 +4783,34 @@ void G_LoadGameData(void)
 	}
 }
 
+// G_DirtyGameData
+// Modifies the gamedata as little as possible to maintain safety in a crash event, while still recording it.
+void G_DirtyGameData(void)
+{
+	FILE *handle = NULL;
+	const UINT8 writebytesource = true;
+
+	if (gamedata)
+		gamedata->evercrashed = true;
+
+	//if (FIL_WriteFileOK(name))
+		handle = fopen(va(pandf, srb2home, gamedatafilename), "r+");
+
+	if (!handle)
+		return;
+
+	// Write a dirty byte immediately after the gamedata check + minor version.
+	if (fseek(handle, 5, SEEK_SET) != -1)
+		fwrite(&writebytesource, 1, 1, handle);
+
+	fclose(handle);
+
+	return;
+}
+
 // G_SaveGameData
 // Saves the main data file, which stores information such as emblems found, etc.
-void G_SaveGameData(boolean dirty)
+void G_SaveGameData(void)
 {
 	size_t length;
 	INT32 i, j, numcups;
@@ -4805,10 +4831,11 @@ void G_SaveGameData(boolean dirty)
 		return;
 	}
 
-	length = (4+1+4+4+
+	length = (4+1+1+
+		4+4+
 		(4*GDGT_MAX)+
 		4+1+1+2+
-		1+1+1+1+
+		1+1+1+
 		4+
 		(MAXEMBLEMS+(MAXUNLOCKABLES*2)+MAXCONDITIONSETS)+
 		4+2);
@@ -4836,6 +4863,13 @@ void G_SaveGameData(boolean dirty)
 
 	WRITEUINT32(save.p, GD_VERSIONCHECK); // 4
 	WRITEUINT8(save.p, GD_VERSIONMINOR); // 1
+
+	// Crash dirtiness
+	// cannot move, see G_DirtyGameData
+	WRITEUINT8(save.p, gamedata->evercrashed); // 1
+
+	// Statistics
+
 	WRITEUINT32(save.p, gamedata->totalplaytime); // 4
 	WRITEUINT32(save.p, gamedata->totalrings); // 4
 
@@ -4849,13 +4883,6 @@ void G_SaveGameData(boolean dirty)
 	WRITEUINT8(save.p, gamedata->keyspending); // 1
 	WRITEUINT16(save.p, gamedata->chaokeys); // 2
 
-	{
-		UINT8 crashflags = (gamedata->crashflags & GDCRASH_ANY);
-		if (dirty)
-			crashflags |= GDCRASH_LAST;
-		WRITEUINT8(save.p, crashflags); // 1
-	}
-
 	WRITEUINT8(save.p, gamedata->everloadedaddon); // 1
 	WRITEUINT8(save.p, gamedata->eversavedreplay); // 1
 	WRITEUINT8(save.p, gamedata->everseenspecial); // 1

src/g_game.h

@@ -175,7 +175,8 @@ boolean G_IsTitleCardAvailable(void);
 // Can be called by the startup code or M_Responder, calls P_SetupLevel.
 void G_LoadGame(UINT32 slot, INT16 mapoverride);
 
-void G_SaveGameData(boolean dirty);
+void G_SaveGameData(void);
+void G_DirtyGameData(void);
 
 void G_SaveGame(UINT32 slot, INT16 mapnum);
 

src/k_menufunc.c

@@ -373,7 +373,7 @@ void M_PlayMenuJam(void)
 {
 	menu_t *refMenu = (menuactive ? currentMenu : restoreMenu);
 	static boolean loserclubpermitted = false;
-	boolean loserclub = (loserclubpermitted && (gamedata->crashflags & GDCRASH_LOSERCLUB));
+	boolean loserclub = (loserclubpermitted && (gamedata->musicflags & GDMUSIC_LOSERCLUB));
 
 	if (challengesmenu.pending)
 	{

src/k_podium.c

@@ -291,7 +291,7 @@ void K_FinishCeremony(void)
 
 	// Play the noise now
 	M_UpdateUnlockablesAndExtraEmblems(true, true);
-	G_SaveGameData(true);
+	G_SaveGameData();
 }
 
 /*--------------------------------------------------
@@ -339,7 +339,7 @@ void K_ResetCeremony(void)
 		grandprixinfo.cup->windata[i].got_emerald = true;
 
 	// Save before playing the noise
-	G_SaveGameData(true);
+	G_SaveGameData();
 }
 
 /*--------------------------------------------------

src/k_pwrlv.c

@@ -428,7 +428,7 @@ void K_CashInPowerLevels(void)
 	if (gamedataupdate)
 	{
 		M_UpdateUnlockablesAndExtraEmblems(true, true);
-		G_SaveGameData(true);
+		G_SaveGameData();
 	}
 
 	//CONS_Printf("========\n");
@@ -644,6 +644,6 @@ void K_PlayerForfeit(UINT8 playerNum, boolean pointLoss)
 		pr->powerlevels[powerType] = yourPower + inc;
 
 		M_UpdateUnlockablesAndExtraEmblems(true, true);
-		G_SaveGameData(true);
+		G_SaveGameData();
 	}
 }

src/m_cond.c

@@ -529,7 +529,8 @@ void M_ClearStats(void)
 	gamedata->everloadedaddon = false;
 	gamedata->eversavedreplay = false;
 	gamedata->everseenspecial = false;
-	gamedata->crashflags = 0;
+	gamedata->evercrashed = false;
+	gamedata->musicflags = 0;
 }
 
 void M_ClearSecrets(void)
@@ -764,9 +765,9 @@ boolean M_CheckCondition(condition_t *cn, player_t *player)
 		case UC_REPLAY:
 			return (gamedata->eversavedreplay == true);
 		case UC_CRASH:
-			if (gamedata->crashflags & (GDCRASH_LAST|GDCRASH_ANY))
+			if (gamedata->evercrashed)
 			{
-				gamedata->crashflags |= GDCRASH_LOSERCLUB;
+				gamedata->musicflags |= GDMUSIC_LOSERCLUB;
 				return true;
 			}
 			return false;
@@ -1224,7 +1225,7 @@ static const char *M_GetConditionString(condition_t *cn)
 		case UC_REPLAY:
 			return "save a replay after finishing a round";
 		case UC_CRASH:
-			if (gamedata->crashflags & (GDCRASH_LAST|GDCRASH_ANY))
+			if (gamedata->evercrashed)
 				return "launch \"Dr. Robotnik's Ring Racers\" again after a game crash";
 			return NULL;
 

src/m_cond.h

@@ -217,9 +217,7 @@ typedef enum
 #endif
 #define challengegridloops (gamedata->challengegridwidth >= CHALLENGEGRIDLOOPWIDTH)
 
-#define GDCRASH_LAST		0x01
-#define GDCRASH_ANY			0x02
-#define GDCRASH_LOSERCLUB	0x04
+#define GDMUSIC_LOSERCLUB	0x01
 
 // This is the largest number of 9s that will fit in UINT32 and UINT16 respectively.
 #define GDMAX_RINGS 999999999
@@ -281,7 +279,8 @@ struct gamedata_t
 	boolean everloadedaddon;
 	boolean eversavedreplay;
 	boolean everseenspecial;
-	UINT8 crashflags;
+	boolean evercrashed;
+	UINT8 musicflags;
 };
 
 extern gamedata_t *gamedata;

src/menus/extras-challenges.c

@@ -399,7 +399,7 @@ void M_ChallengesTick(void)
 		{
 			// All done! Let's save the unlocks we've busted open.
 			challengesmenu.pending = challengesmenu.chaokeyadd = false;
-			G_SaveGameData(true);
+			G_SaveGameData();
 		}
 	}
 	else if (challengesmenu.pending)

src/p_setup.c

@@ -7501,7 +7501,7 @@ static void P_InitGametype(void)
 
 	// Started a game? Move on to the next jam when you go back to the title screen
 	CV_SetValue(&cv_menujam_update, 1);
-	gamedata->crashflags &= ~GDCRASH_LOSERCLUB;
+	gamedata->musicflags = 0;
 }
 
 struct minimapinfo minimapinfo;
@@ -7995,7 +7995,7 @@ boolean P_LoadLevel(boolean fromnetsave, boolean reloadinggamestate)
 		mapheaderinfo[gamemap-1]->mapvisited |= MV_VISITED;
 
 		M_UpdateUnlockablesAndExtraEmblems(true, true);
-		G_SaveGameData(true);
+		G_SaveGameData();
 	}
 
 	G_AddMapToBuffer(gamemap-1);

src/p_tick.c

@@ -620,7 +620,7 @@ void P_Ticker(boolean run)
 		// TODO would this be laggy with more conditions in play...
 		if (((!demo.playback && leveltime > introtime && M_UpdateUnlockablesAndExtraEmblems(true, false))
 			|| (gamedata && gamedata->deferredsave)))
-			G_SaveGameData(true);
+			G_SaveGameData();
 	}
 
 	// Keep track of how long they've been playing!

src/sdl/i_system.c

@@ -328,6 +328,7 @@ FUNCNORETURN static ATTRNORETURN void signal_handler(INT32 num)
 {
 	D_QuitNetGame(); // Fix server freezes
 	CL_AbortDownloadResume();
+	G_DirtyGameData();
 #ifdef UNIXBACKTRACE
 	write_backtrace(num);
 #endif
@@ -1448,7 +1449,7 @@ void I_Quit(void)
 	if (Playing())
 		K_PlayerForfeit(consoleplayer, true);
 
-	G_SaveGameData(false); // Tails 12-08-2002 -- undirty your save
+	G_SaveGameData(); // Tails 12-08-2002
 	//added:16-02-98: when recording a demo, should exit using 'q' key,
 	//        but sometimes we forget and use 'F10'.. so save here too.
 
@@ -1532,7 +1533,8 @@ void I_Error(const char *error, ...)
 		if (errorcount == 8)
 		{
 			M_SaveConfig(NULL);
-			G_SaveGameData(true);
+			G_DirtyGameData(); // done first in case an error is in G_SaveGameData
+			G_SaveGameData();
 		}
 		if (errorcount > 20)
 		{
@@ -1563,7 +1565,8 @@ void I_Error(const char *error, ...)
 
 	M_SaveConfig(NULL); // save game config, cvars..
 	D_SaveBan(); // save the ban list
-	G_SaveGameData(true); // Tails 12-08-2002
+	G_DirtyGameData(); // done first in case an error is in G_SaveGameData
+	G_SaveGameData(); // Tails 12-08-2002
 
 	// Shutdown. Here might be other errors.
 

src/sdl12/i_system.c

@@ -357,6 +357,7 @@ static void signal_handler(INT32 num)
 		sigmsg = sigdef;
 	}
 
+	G_DirtyGameData();
 	I_OutputMsg("signal_handler() error: %s\n", sigmsg);
 	signal(num, SIG_DFL);               //default signal action
 	raise(num);
@@ -2983,7 +2984,7 @@ void I_Quit(void)
 	if (Playing())
 		K_PlayerForfeit(consoleplayer, true);
 
-	G_SaveGameData(false); // Tails 12-08-2002 -- undirty your save
+	G_SaveGameData(); // Tails 12-08-2002
 	//added:16-02-98: when recording a demo, should exit using 'q' key,
 	//        but sometimes we forget and use 'F10'.. so save here too.
 
@@ -3078,7 +3079,8 @@ void I_Error(const char *error, ...)
 		if (errorcount == 9)
 		{
 			M_SaveConfig(NULL);
-			G_SaveGameData(true);
+			G_DirtyGameData(); // done first in case an error is in G_SaveGameData
+			G_SaveGameData();
 		}
 		if (errorcount > 20)
 		{
@@ -3142,7 +3144,8 @@ void I_Error(const char *error, ...)
 #ifndef NONET
 	D_SaveBan(); // save the ban list
 #endif
-	G_SaveGameData(true); // Tails 12-08-2002
+	G_DirtyGameData(); // done first in case an error is in G_SaveGameData
+	G_SaveGameData(); // Tails 12-08-2002
 
 	// Shutdown. Here might be other errors.
 	if (demorecording)

src/w_wad.c

@@ -819,7 +819,7 @@ UINT16 W_InitFile(const char *filename, boolean mainfile, boolean startup)
 	{
 		gamedata->everloadedaddon = true;
 		M_UpdateUnlockablesAndExtraEmblems(true, true);
-		G_SaveGameData(true);
+		G_SaveGameData();
 	}
 
 	switch(type = ResourceFileDetect(filename))

src/win32ce/win_sys.c

@@ -469,6 +469,7 @@ static void signal_handler(int num)
 	char sigdef[64];
 
 	D_QuitNetGame(); // Fix server freezes
+	G_DirtyGameData();
 	I_ShutdownSystem();
 
 	switch (num)
@@ -607,7 +608,8 @@ void I_Error(const char *error, ...)
 		if (errorcount == 7)
 		{
 			M_SaveConfig(NULL);
-			G_SaveGameData(true);
+			G_DirtyGameData(); // done first in case an error is in G_SaveGameData
+			G_SaveGameData();
 		}
 		if (errorcount > 20)
 		{
@@ -636,7 +638,8 @@ void I_Error(const char *error, ...)
 	if (!errorcount)
 	{
 		M_SaveConfig(NULL); // save game config, cvars..
-		G_SaveGameData(true);
+		G_DirtyGameData(); // done first in case an error is in G_SaveGameData
+		G_SaveGameData();
 	}
 
 	// save demo, could be useful for debug
@@ -726,7 +729,7 @@ void I_Quit(void)
 		G_CheckDemoStatus();
 
 	M_SaveConfig(NULL); // save game config, cvars..
-	G_SaveGameData(false); // undirty your save
+	G_SaveGameData(); // undirty your save
 
 	// maybe it needs that the ticcount continues,
 	// or something else that will be finished by I_ShutdownSystem(),