Libretro: Reimplement a functioning content restart

Not tested on windows, but should work. Also, we don't need to
repopulate all the path and arg structures when restarting, so only
do what's necessary to re-load FreeJ2ME and the app jar it should
run.

Author: AShiningRay

Diff for: src/libretro/freej2me_libretro.c

@@ -119,6 +119,7 @@ int mouseLpre = 0; /* old mouse button state */
 bool uses_mouse = true;
 bool uses_pointer = false;
 bool booted = false;
+bool restarting = false;
 
 unsigned int readSize = 16384;
 unsigned char readBuffer[16384];
@@ -138,6 +139,9 @@ int framesDropped = 0;
 /* Libretro exposed config variables START */
 
 char *options_update; /* String containing the options updated in check_variables() */
+char *systemPath; /* Path of FreeJ2ME's jar */
+char *outPath; /* Actual path of FreeJ2ME's jar to start */
+char** params; /* Char matrix containing launch arguments */
 unsigned int optstrlen; /* length of the string above */
 unsigned long int screenRes[2]; /* {width, height} */
 int rotateScreen; /* acts as a boolean */
@@ -443,6 +447,8 @@ static void check_variables(bool first_time_startup)
 
 
 	/* Prepare a string to pass those core options to the Java app */
+	options_update = malloc(sizeof(char) * PIPE_MAX_LEN);
+
 	snprintf(options_update, PIPE_MAX_LEN, "FJ2ME_LR_OPTS:|%lux%lu|%d|%d|%d|%d|%d|%d|%d", screenRes[0], screenRes[1], rotateScreen, phoneType, gameFPS, soundEnabled, customMidi, maxMidiPlayers, dumpAudioStreams);
 	optstrlen = strlen(options_update);
 
@@ -456,6 +462,8 @@ static void check_variables(bool first_time_startup)
 		write_to_pipe(pWrite[1], options_update, optstrlen);
 		log_fn(RETRO_LOG_INFO, "Sent updated options to the Java app.\n");
 	}
+
+	free(options_update);
 }
 
 /* Core exit function */
@@ -466,7 +474,6 @@ void quit(int state)
 	{
 		kill(javaProcess, SIGKILL);
 	}
-	/* exit(state); */
 }
 
 #elif _WIN32
@@ -491,8 +498,6 @@ void retro_init(void)
 	/* init buffers, structs */
 	memset(frame, 0, frameSize);
 	memset(frameBuffer, 0, frameBufferSize);
-	options_update = malloc(sizeof(char) * PIPE_MAX_LEN);
-
 	/*
 	 * Those below are arguments sent to Java during init. Otherwise, games
 	 * wouldn't get a res setting, rotation, fps, etc. that matched the
@@ -515,14 +520,35 @@ void retro_init(void)
 	sprintf(dumpAudioArg,   "%d",  dumpAudioStreams);
 
 	/* start java process */
-	char *javapath;
-	Environ(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &javapath);
-	char *outPath = malloc(sizeof(char) * PATH_MAX_LENGTH);
-	fill_pathname_join(outPath, javapath, "freej2me-lr.jar", PATH_MAX_LENGTH);
-	char *params[] = { "java", "-jar", outPath, resArg[0], resArg[1], rotateArg, phoneArg, fpsArg, soundArg, midiArg, maxMidiArg, dumpAudioArg, NULL };
 
-	log_fn(RETRO_LOG_INFO, "Passing params: %s | %s | %s | %s | %s | %s | %s | %s | %s\n", *(params+3),
+	
+	if(!restarting) 
+	{
+		log_fn(RETRO_LOG_INFO, "Setting up FreeJ2ME-Plus' Java app.\n");
+		Environ(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &systemPath);
+		outPath = malloc(sizeof(char) * PATH_MAX_LENGTH);
+		fill_pathname_join(outPath, systemPath, "freej2me-lr.jar", PATH_MAX_LENGTH);
+
+		log_fn(RETRO_LOG_INFO, "Setting up params. \n");
+		params = (char**)malloc(sizeof(char*) * PATH_MAX_LENGTH * 2);
+		params[0] = strdup("java");
+		params[1] = strdup("-jar");
+		params[2] = strdup(outPath);
+		params[3] = strdup(resArg[0]);
+		params[4] = strdup(resArg[1]);
+		params[5] = strdup(rotateArg);
+		params[6] = strdup(phoneArg);
+		params[7] = strdup(fpsArg);
+		params[8] = strdup(soundArg);
+		params[9] = strdup(midiArg);
+		params[10] = strdup(maxMidiArg);
+		params[11] = strdup(dumpAudioArg);
+		params[12] = NULL; // Null-terminate the array
+
+		log_fn(RETRO_LOG_INFO, "Passing params: %s | %s | %s | %s | %s | %s | %s | %s | %s\n", *(params+3),
 		*(params+4), *(params+5), *(params+6), *(params+7), *(params+8), *(params+9), *(params+10), *(params+11));
+	}
+
 	log_fn(RETRO_LOG_INFO, "Preparing to open FreeJ2ME-Plus' Java app (make sure freej2me-lr.jar is inside system/).\n");
 
 #ifdef __linux__
@@ -983,6 +1009,8 @@ void retro_deinit(void)
 
 void retro_reset(void)
 {
+	restarting = true;
+	booted = false;
 	retro_deinit();
 	retro_init();
 	retro_load_game(&gameinfo);
@@ -1007,15 +1035,17 @@ pid_t javaOpen(char *cmd, char **params)
 {
     pid_t pid;
 
-	char *systemPath;
-	Environ(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &systemPath);
-    log_fn(RETRO_LOG_INFO, "System Path: %s\n", systemPath);
+	if(!restarting) 
+	{
+		log_fn(RETRO_LOG_INFO, "System Path: %s\n", systemPath);
 
-	log_fn(RETRO_LOG_INFO, "Setting up java app's process and pipes...\n");
+		log_fn(RETRO_LOG_INFO, "Setting up java app's process and pipes...\n");
 
-	log_fn(RETRO_LOG_INFO, "Opening: %s %s %s ...\n", *(params+0), *(params+1), *(params+2));
-	log_fn(RETRO_LOG_INFO, "Params: %s | %s | %s | %s | %s | %s | %s | %s | %s\n", *(params+3),
-		*(params+4), *(params+5), *(params+6), *(params+7), *(params+8), *(params+9), *(params+10), *(params+11));
+		log_fn(RETRO_LOG_INFO, "Opening: %s %s %s ...\n", *(params+0), *(params+1), *(params+2));
+		log_fn(RETRO_LOG_INFO, "Params: %s | %s | %s | %s | %s | %s | %s | %s | %s\n", *(params+3),
+			*(params+4), *(params+5), *(params+6), *(params+7), *(params+8), *(params+9), *(params+10), *(params+11));
+	}
+	else { log_fn(RETRO_LOG_INFO, "\n\nRESTARTING!!!\n\n"); restarting = false; }
 
 	int fd_stdin  = 0;
 	int fd_stdout = 1;
@@ -1079,9 +1109,6 @@ void javaOpen(char *cmd, char **params)
 {
 	SECURITY_ATTRIBUTES pipeSec;
 
-	char *systemPath;
-	Environ(RETRO_ENVIRONMENT_GET_SYSTEM_DIRECTORY, &systemPath);
-    log_fn(RETRO_LOG_INFO, "System Path: %s\n", systemPath);
 	log_fn(RETRO_LOG_INFO, "Setting up java app's process and pipes...\n");
 
 	ZeroMemory( &pipeSec, sizeof(pipeSec) );
@@ -1146,13 +1173,21 @@ void javaOpen(char *cmd, char **params)
 	log_fn(RETRO_LOG_INFO, "Opening: %s \n", cmd);
 	for (int i = 3; i <= 11; i++) /* There are 10 cmd arguments for now */
 	{
-		log_fn(RETRO_LOG_INFO, "Processing arg %d: %s \n", i, *(params+i));
+		//log_fn(RETRO_LOG_INFO, "Processing arg %d: %s \n", i, *(params+i));
 		sprintf(cmdWin, "%s %s", cmdWin, *(params+i));
 	}
 
-	log_fn(RETRO_LOG_INFO, "Creating proc: %s \n", cmdWin);
-	log_fn(RETRO_LOG_INFO, "Params: %s | %s | %s | %s | %s | %s | %s | %s | %s\n", *(params+3),
-		*(params+4), *(params+5), *(params+6), *(params+7), *(params+8), *(params+9), *(params+10), *(params+11));
+	if(!restarting) 
+	{
+		log_fn(RETRO_LOG_INFO, "System Path: %s\n", systemPath);
+
+		log_fn(RETRO_LOG_INFO, "Setting up java app's process and pipes...\n");
+
+		log_fn(RETRO_LOG_INFO, "Opening: %s %s %s ...\n", *(params+0), *(params+1), *(params+2));
+		log_fn(RETRO_LOG_INFO, "Params: %s | %s | %s | %s | %s | %s | %s | %s | %s\n", *(params+3),
+			*(params+4), *(params+5), *(params+6), *(params+7), *(params+8), *(params+9), *(params+10), *(params+11));
+	}
+	else { log_fn(RETRO_LOG_INFO, "\n\nRESTARTING!!!\n\n"); restarting = false; }
 
 	GetStartupInfo(&startInfo);
 	startInfo.dwFlags = STARTF_USESTDHANDLES;