megacd: reset drive without ejecting a disk

* megacd: fix sgets()

* megacd: reset drive without ejecting a disk

menu.cpp

@@ -760,7 +760,6 @@ static void vga_nag()
 		OsdWrite(n++, "  or enable scaler on VGA:");
 		OsdWrite(n++, "       vga_scaler=1");
 		for (; n < OsdGetSize(); n++) OsdWrite(n);
-		OsdUpdate();
 		OsdEnable(0);
 		EnableOsd_on(OSD_HDMI);
 	}
@@ -1575,7 +1574,7 @@ void HandleUI(void)
 						}
 						else
 						{
-							if (mask == 1 && is_megacd_core()) mcd_set_image(0, "");
+							if (mask == 1 && is_megacd_core()) mcd_reset();
 
 							uint32_t status = user_io_8bit_set_status(0, 0, ex);
 

support/megacd/cdd.cpp

@@ -14,9 +14,7 @@ cdd_t cdd;
 uint32_t frame = 0;
 
 cdd_t::cdd_t() {
-	cycles = 0;
 	latency = 10;
-	type = 0;
 	loaded = 0;
 	index = 0;
 	lba = 0;
@@ -306,6 +304,28 @@ void cdd_t::Unload()
 	this->sectorSize = 0;
 }
 
+void cdd_t::Reset() {
+	latency = 10;
+	index = 0;
+	lba = 0;
+	scanOffset = 0;
+	isData = 1;
+	status = CD_STAT_STOP;
+	audioLength = 0;
+	audioOffset = 0;
+
+	stat[0] = 0x0;
+	stat[1] = 0x0;
+	stat[2] = 0x0;
+	stat[3] = 0x0;
+	stat[4] = 0x0;
+	stat[5] = 0x0;
+	stat[6] = 0x0;
+	stat[7] = 0x0;
+	stat[8] = 0x0;
+	stat[9] = 0xF;
+}
+
 void cdd_t::Update() {
 	if (this->status == CD_STAT_STOP || this->status == CD_STAT_TRAY || this->status == CD_STAT_OPEN)
 	{

support/megacd/megacd.cpp

@@ -93,6 +93,10 @@ void mcd_set_image(int num, const char *filename)
 	}
 }
 
+void mcd_reset() {
+	cdd.Reset();
+}
+
 
 int cdd_t::SectorSend(uint8_t* header)
 {

support/megacd/megacd.h

@@ -70,6 +70,7 @@ public:
 	cdd_t();
 	int Load(const char *filename);
 	void Unload();
+	void Reset();
 	void Update();
 	void CommandExec();
 	int SectorSend(uint8_t* header);
@@ -82,8 +83,6 @@ private:
 	toc_t toc;
 	int index;
 	int lba;
-	uint32_t cycles;
-	int type;
 	uint16_t sectorSize;
 	int scanOffset;
 	int audioLength;
@@ -116,5 +115,6 @@ extern uint32_t frame;
 
 void mcd_poll();
 void mcd_set_image(int num, const char *filename);
+void mcd_reset();
 
 #endif

user_io.cpp

@@ -1828,7 +1828,7 @@ void user_io_send_buttons(char force)
 		{
 			if (is_archie()) fpga_load_rbf(name[0] ? name : "Archie.rbf");
 			if (is_minimig()) minimig_reset();
-			if (is_megacd_core()) mcd_set_image(0, "");
+			if (is_megacd_core()) mcd_reset();
 		}
 
 		key_map = map;