From ef132c44e474190f5f44cbaaded3ee7ae970e6f0 Mon Sep 17 00:00:00 2001
From: ansstuff <ansstuff@users.sf.net>
Date: Sun, 4 Aug 2013 13:05:48 +0000
Subject: [PATCH] Auto-disable "Game Genie ROM" feature when no "gg.rom" file
 is found.

---
 trunk/src/cart.cpp | 33 ++++++++++++++++++++++-----------
 trunk/src/cart.h   |  2 +-
 trunk/src/fceu.cpp | 12 +++++++++++-
 3 files changed, 34 insertions(+), 13 deletions(-)

diff --git a/trunk/src/cart.cpp b/trunk/src/cart.cpp
index 6b58bcf7..baeaba65 100644
--- a/trunk/src/cart.cpp
+++ b/trunk/src/cart.cpp
@@ -340,40 +340,48 @@ static uint8 *GENIEROM = 0;
 
 void FixGenieMap(void);
 
-// Called when a game(file) is opened successfully.
-void FCEU_OpenGenie(void) {
+// Called when a game(file) is opened successfully. Returns TRUE on error.
+bool FCEU_OpenGenie(void)
+{
 	FILE *fp;
 	int x;
 
-	if (!GENIEROM) {
+	if (!GENIEROM)
+	{
 		char *fn;
 
-		if (!(GENIEROM = (uint8*)FCEU_malloc(4096 + 1024))) return;
+		if (!(GENIEROM = (uint8*)FCEU_malloc(4096 + 1024)))
+			return true;
 
 		fn = strdup(FCEU_MakeFName(FCEUMKF_GGROM, 0, 0).c_str());
 		fp = FCEUD_UTF8fopen(fn, "rb");
-		if (!fp) {
-			FCEU_PrintError("Error opening Game Genie ROM image!");
+		if (!fp)
+		{
+			FCEU_PrintError("Error opening Game Genie ROM image!\nIt should be named \"gg.rom\"!");
 			free(GENIEROM);
 			GENIEROM = 0;
-			return;
+			return true;
 		}
-		if (fread(GENIEROM, 1, 16, fp) != 16) {
+		if (fread(GENIEROM, 1, 16, fp) != 16)
+		{
  grerr:
 			FCEU_PrintError("Error reading from Game Genie ROM image!");
 			free(GENIEROM);
 			GENIEROM = 0;
 			fclose(fp);
-			return;
+			return true;
 		}
-		if (GENIEROM[0] == 0x4E) { /* iNES ROM image */
+		if (GENIEROM[0] == 0x4E)
+		{
+			/* iNES ROM image */
 			if (fread(GENIEROM, 1, 4096, fp) != 4096)
 				goto grerr;
 			if (fseek(fp, 16384 - 4096, SEEK_CUR))
 				goto grerr;
 			if (fread(GENIEROM + 4096, 1, 256, fp) != 256)
 				goto grerr;
-		} else {
+		} else
+		{
 			if (fread(GENIEROM + 16, 1, 4352 - 16, fp) != (4352 - 16))
 				goto grerr;
 		}
@@ -381,10 +389,13 @@ void FCEU_OpenGenie(void) {
 
 		/* Workaround for the FCE Ultra CHR page size only being 1KB */
 		for (x = 0; x < 4; x++)
+		{
 			memcpy(GENIEROM + 4096 + (x << 8), GENIEROM + 4096, 256);
+		}
 	}
 
 	geniestage = 1;
+	return false;
 }
 
 /* Called when a game is closed. */
diff --git a/trunk/src/cart.h b/trunk/src/cart.h
index b6b5c73a..e5670c54 100644
--- a/trunk/src/cart.h
+++ b/trunk/src/cart.h
@@ -89,6 +89,6 @@ extern int geniestage;
 
 void FCEU_GeniePower(void);
 
-void FCEU_OpenGenie(void);
+bool FCEU_OpenGenie(void);
 void FCEU_CloseGenie(void);
 void FCEU_KillGenie(void);
diff --git a/trunk/src/fceu.cpp b/trunk/src/fceu.cpp
index 4b38d435..da418b92 100644
--- a/trunk/src/fceu.cpp
+++ b/trunk/src/fceu.cpp
@@ -486,8 +486,18 @@ FCEUGI *FCEUI_LoadGameVirtual(const char *name, int OverwriteVidMode, bool silen
 	FCEU_ResetVidSys();
 
 	if (GameInfo->type != GIT_NSF)
+	{
 		if (FSettings.GameGenie)
-			FCEU_OpenGenie();
+		{
+			if (FCEU_OpenGenie())
+			{
+				FCEUI_SetGameGenie(false);
+#ifdef WIN32
+				genie = 0;
+#endif
+			}
+		}
+	}
 	PowerNES();
 
 	if (GameInfo->type != GIT_NSF)