// for finding memory leaks in debug mode with Visual Studio#if defined _DEBUG && defined _MSC_VER#include <crtdbg.h>#endif #ifdef _WIN32#define WIN32_MEAN_AND_LEAN#include <windows.h>#include <SDL2/SDL_syswm.h>#else#include <limits.h>#include <signal.h>#include <unistd.h> // chdir()#endif#include <stdio.h>#include <sys/stat.h>#include "ft2_header.h"#include "ft2_config.h"#include "ft2_diskop.h"#include "ft2_module_loader.h"#include "ft2_module_saver.h"#include "ft2_sample_loader.h"#include "ft2_mouse.h"#include "ft2_midi.h"#include "ft2_video.h"#include "ft2_trim.h"#include "ft2_inst_ed.h"#include "ft2_sampling.h"#include "ft2_textboxes.h"#include "ft2_sysreqs.h"#include "ft2_keyboard.h"#include "ft2_sample_ed.h"#include "ft2_sample_ed_features.h"#include "ft2_structs.h" #define CRASH_TEXT "Oh no! The Fasttracker II clone has crashed...\nA backup .xm was hopefully " \                   "saved to the current module directory.\n\nPlease report this bug if you can.\n" \                   "Try to mention what you did before the crash happened.\n" \                   "My email is on the bottom of https://16-bits.org" static bool backupMadeAfterCrash; #ifdef _WIN32#define SYSMSG_FILE_ARG (WM_USER+1)#define ARGV_SHARED_MEM_MAX_LEN ((PATH_MAX+1) * sizeof (WCHAR))#define SHARED_HWND_NAME TEXT("Local\\FT2CloneHwnd")#define SHARED_FILENAME TEXT("Local\\FT2CloneFilename")static HWND hWnd;static HANDLE oneInstHandle, hMapFile;static LPCTSTR sharedMemBuf;#endif static void handleSDLEvents(void); void readInput(void){	readMouseXY();	readKeyModifiers();	setSyncedReplayerVars();	handleSDLEvents();} void handleThreadEvents(void){	if (okBoxData.active)	{		okBoxData.returnData = okBox(okBoxData.type, okBoxData.headline, okBoxData.text);		okBoxData.active = false;	}} void handleEvents(void){#ifdef HAS_MIDI	// called after MIDI has been initialized	if (midi.rescanDevicesFlag)	{		midi.rescanDevicesFlag = false; 		rescanMidiInputDevices();		if (ui.configScreenShown && editor.currConfigScreen == CONFIG_SCREEN_MIDI_INPUT)			drawMidiInputList();	}#endif 	if (editor.trimThreadWasDone)	{		editor.trimThreadWasDone = false;		trimThreadDone();	} 	if (editor.updateCurSmp)	{		editor.updateCurSmp = false; 		updateNewInstrument();		updateNewSample(); 		diskOpSetFilename(DISKOP_ITEM_SAMPLE, editor.tmpFilenameU); 		removeSampleIsLoadingFlag();		setMouseBusy(false);	} 	if (editor.updateCurInstr)	{		editor.updateCurInstr = false; 		updateNewInstrument();		updateNewSample(); 		diskOpSetFilename(DISKOP_ITEM_INSTR, editor.tmpInstrFilenameU);		setMouseBusy(false);	} 	// some Disk Op. stuff 	if (editor.diskOpReadDir)	{		editor.diskOpReadDir = false;		diskOp_StartDirReadThread();	} 	if (editor.diskOpReadDone)	{		editor.diskOpReadDone = false;		if (ui.diskOpShown)			diskOp_DrawDirectory();	} 	handleLoadMusicEvents(); 	if (editor.samplingAudioFlag) handleSamplingUpdates();	if (ui.setMouseBusy) mouseAnimOn();	if (ui.setMouseIdle) mouseAnimOff(); 	if (editor.updateWindowTitle)	{		editor.updateWindowTitle = false;		updateWindowTitle(false);	}} // Windows specific routines#ifdef _WIN32static bool instanceAlreadyOpen(void){	hMapFile = OpenFileMapping(FILE_MAP_ALL_ACCESS, FALSE, SHARED_HWND_NAME);	if (hMapFile != NULL)		return true; // another instance is already open 	// no instance is open, let's created a shared memory file with hWnd in it	oneInstHandle = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, sizeof (HWND), SHARED_HWND_NAME);	if (oneInstHandle != NULL)	{		sharedMemBuf = (LPTSTR)MapViewOfFile(oneInstHandle, FILE_MAP_ALL_ACCESS, 0, 0, sizeof (HWND));		if (sharedMemBuf != NULL)		{			CopyMemory((PVOID)sharedMemBuf, &video.hWnd, sizeof (HWND));			UnmapViewOfFile(sharedMemBuf);			sharedMemBuf = NULL;		}	} 	return false;} bool handleSingleInstancing(int32_t argc, char **argv){	SDL_SysWMinfo wmInfo; 	SDL_VERSION(&wmInfo.version);	if (!SDL_GetWindowWMInfo(video.window, &wmInfo))		return false; 	video.hWnd = wmInfo.info.win.window;	if (instanceAlreadyOpen() && argc >= 2 && argv[1][0] != '\0')	{		sharedMemBuf = (LPTSTR)MapViewOfFile(hMapFile, FILE_MAP_ALL_ACCESS, 0, 0, sizeof (HWND));		if (sharedMemBuf != NULL)		{			memcpy(&hWnd, sharedMemBuf, sizeof (HWND)); 			UnmapViewOfFile(sharedMemBuf);			sharedMemBuf = NULL;			CloseHandle(hMapFile);			hMapFile = NULL; 			hMapFile = CreateFileMapping(INVALID_HANDLE_VALUE, NULL, PAGE_READWRITE, 0, ARGV_SHARED_MEM_MAX_LEN, SHARED_FILENAME);			if (hMapFile != NULL)			{				sharedMemBuf = (LPTSTR)MapViewOfFile(hMapFile, FILE_MAP_ALL_ACCESS, 0, 0, ARGV_SHARED_MEM_MAX_LEN);				if (sharedMemBuf != NULL)				{					strcpy((char *)sharedMemBuf, argv[1]); 					UnmapViewOfFile(sharedMemBuf);					sharedMemBuf = NULL; 					SendMessage(hWnd, SYSMSG_FILE_ARG, 0, 0);					Sleep(80); // wait a bit to make sure first instance received msg 					CloseHandle(hMapFile);					hMapFile = NULL; 					return true; // quit instance now				}			} 			return true;		} 		CloseHandle(hMapFile);		hMapFile = NULL;	} 	SDL_EventState(SDL_SYSWMEVENT, SDL_ENABLE);	return false;} static void handleSysMsg(SDL_Event inputEvent){	if (inputEvent.type != SDL_SYSWMEVENT)		return; 	SDL_SysWMmsg *wmMsg = inputEvent.syswm.msg;	if (wmMsg->subsystem == SDL_SYSWM_WINDOWS && wmMsg->msg.win.msg == SYSMSG_FILE_ARG)	{		hMapFile = OpenFileMapping(FILE_MAP_READ, FALSE, SHARED_FILENAME);		if (hMapFile != NULL)		{			sharedMemBuf = (LPTSTR)MapViewOfFile(hMapFile, FILE_MAP_READ, 0, 0, ARGV_SHARED_MEM_MAX_LEN);			if (sharedMemBuf != NULL)			{				editor.autoPlayOnDrop = true;				loadDroppedFile((char *)sharedMemBuf, true); 				UnmapViewOfFile(sharedMemBuf);				sharedMemBuf = NULL; 				if (video.window != NULL)				{					SDL_RestoreWindow(video.window);					SDL_RaiseWindow(video.window);				}			} 			CloseHandle(hMapFile);			hMapFile = NULL;		}	}} void closeSingleInstancing(void){	if (oneInstHandle != NULL)	{		CloseHandle(oneInstHandle);		oneInstHandle = NULL;	}} static LONG WINAPI exceptionHandler(EXCEPTION_POINTERS *ptr){#define BACKUP_FILES_TO_TRY 1000	char fileName[32];	struct stat statBuffer; 	if (oneInstHandle != NULL)		CloseHandle(oneInstHandle); 	if (!backupMadeAfterCrash)	{		if (getDiskOpModPath() != NULL && UNICHAR_CHDIR(getDiskOpModPath()) == 0)		{			// find a free filename			int32_t i;			for (i = 1; i < BACKUP_FILES_TO_TRY; i++)			{				sprintf(fileName, "backup%03d.xm", (int32_t)i);				if (stat(fileName, &statBuffer) != 0)					break; // filename OK			} 			if (i != BACKUP_FILES_TO_TRY)			{				UNICHAR *fileNameU = cp437ToUnichar(fileName);				if (fileNameU != NULL)				{					saveXM(fileNameU);					free(fileNameU);				}			}		} 		backupMadeAfterCrash = true; // set this flag to prevent multiple backups from being saved at once		showErrorMsgBox(CRASH_TEXT);	} 	return EXCEPTION_CONTINUE_SEARCH; 	(void)ptr;}#elsestatic void exceptionHandler(int32_t signal){#define BACKUP_FILES_TO_TRY 1000	char fileName[32];	struct stat statBuffer; 	if (signal == 15)		return; 	if (!backupMadeAfterCrash)	{		if (getDiskOpModPath() != NULL && UNICHAR_CHDIR(getDiskOpModPath()) == 0)		{			// find a free filename			int32_t i;			for (i = 1; i < BACKUP_FILES_TO_TRY; i++)			{				sprintf(fileName, "backup%03d.xm", i);				if (stat(fileName, &statBuffer) != 0)					break; // filename OK			} 			if (i != BACKUP_FILES_TO_TRY)			{				UNICHAR *fileNameU = cp437ToUnichar(fileName);				if (fileNameU != NULL)				{					saveXM(fileNameU);					free(fileNameU);				}			}		} 		backupMadeAfterCrash = true; // set this flag to prevent multiple backups from being saved at once		showErrorMsgBox(CRASH_TEXT);	}}#endif void setupCrashHandler(void){#ifndef _DEBUG#ifdef _WIN32	SetUnhandledExceptionFilter(exceptionHandler);#else	struct sigaction act;	struct sigaction oldAct; 	memset(&act, 0, sizeof (act));	act.sa_handler = exceptionHandler;	act.sa_flags = SA_RESETHAND; 	sigaction(SIGILL | SIGABRT | SIGFPE | SIGSEGV, &act, &oldAct);	sigaction(SIGILL, &act, &oldAct);	sigaction(SIGABRT, &act, &oldAct);	sigaction(SIGFPE, &act, &oldAct);	sigaction(SIGSEGV, &act, &oldAct);#endif#endif} void handleWaitVblQuirk(SDL_Event *event){	if (event->type == SDL_WINDOWEVENT)	{		if (event->window.event == SDL_WINDOWEVENT_HIDDEN)			video.windowHidden = true;		else if (event->window.event == SDL_WINDOWEVENT_SHOWN)			video.windowHidden = false; 		// reset vblank end time if we minimize window		if (event->window.event == SDL_WINDOWEVENT_MINIMIZED || event->window.event == SDL_WINDOWEVENT_FOCUS_LOST)			hpc_ResetCounters(&video.vblankHpc);	}} static void handleSDLEvents(void){	SDL_Event event; 	if (!editor.busy)		handleLastGUIObjectDown(); // this should be handled before main input poll (on next frame) 	while (SDL_PollEvent(&event))	{		handleWaitVblQuirk(&event); 		if (editor.busy)		{			const uint32_t eventType = event.type;			const SDL_Scancode key = event.key.keysym.scancode; 			/* The Echo tool in Smp. Ed. can take forever if abused, let			** mouse buttons/ESC/SIGTERM force-stop it.			*/			if (eventType == SDL_MOUSEBUTTONDOWN || eventType == SDL_QUIT ||				(eventType == SDL_KEYUP && key == SDL_SCANCODE_ESCAPE))			{				handleEchoToolPanic();			} 			// let certain mouse buttons or keyboard keys stop certain events			if (eventType == SDL_MOUSEBUTTONDOWN ||				(eventType == SDL_KEYDOWN && key != SDL_SCANCODE_MUTE &&				 key != SDL_SCANCODE_AUDIOMUTE && key != SDL_SCANCODE_VOLUMEDOWN &&				 key != SDL_SCANCODE_VOLUMEUP))			{				if (editor.samplingAudioFlag)					stopSampling(); 				editor.wavIsRendering = false;			} 			continue; // another thread is busy with something, drop input		} #ifdef _WIN32		handleSysMsg(event);#endif		// text input when editing texts		if (event.type == SDL_TEXTINPUT)		{			if (editor.editTextFlag)			{				if (keyb.ignoreTextEditKey)				{					keyb.ignoreTextEditKey = false;					continue;				} 				char *inputText = utf8ToCp437(event.text.text, false);				if (inputText != NULL)				{					if (inputText[0] != '\0')						handleTextEditInputChar(inputText[0]); 					free(inputText);				}			}		}		else if (event.type == SDL_MOUSEWHEEL)		{			if (event.wheel.y > 0)				mouseWheelHandler(MOUSE_WHEEL_UP);			else if (event.wheel.y < 0)				mouseWheelHandler(MOUSE_WHEEL_DOWN);		}		else if (event.type == SDL_DROPFILE)		{			editor.autoPlayOnDrop = false;			loadDroppedFile(event.drop.file, true);			SDL_free(event.drop.file); 			SDL_RestoreWindow(video.window);			SDL_RaiseWindow(video.window);		}		else if (event.type == SDL_QUIT)		{			if (ui.sysReqShown)				continue; 			if (editor.editTextFlag)				exitTextEditing(); 			if (!song.isModified)			{				editor.throwExit = true;			}			else			{				if (!video.fullscreen)				{					// de-minimize window and set focus so that the user sees the message box					SDL_RestoreWindow(video.window);					SDL_RaiseWindow(video.window);				} 				if (quitBox(true) == 1)					editor.throwExit = true;			}		}		else if (event.type == SDL_KEYUP)		{			keyUpHandler(event.key.keysym.scancode, event.key.keysym.sym);		}		else if (event.type == SDL_KEYDOWN)		{			keyDownHandler(event.key.keysym.scancode, event.key.keysym.sym, event.key.repeat);		}		else if (event.type == SDL_MOUSEBUTTONUP)		{			mouseButtonUpHandler(event.button.button);		}		else if (event.type == SDL_MOUSEBUTTONDOWN)		{			mouseButtonDownHandler(event.button.button);

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