From 00cf8728216cb61d9c2ac847bec8b7be4e11c518 Mon Sep 17 00:00:00 2001
From: twinaphex <libretro@gmail.com>
Date: Sun, 4 Oct 2020 11:46:35 +0200
Subject: [PATCH] Convert DrZ80_support.cpp to C

---
 DrZ80_support.cpp => DrZ80_support.c | 62 ++++++++++++++--------------
 DrZ80_support.h                      |  7 ++--
 Makefile.common                      |  2 +-
 3 files changed, 35 insertions(+), 36 deletions(-)
 rename DrZ80_support.cpp => DrZ80_support.c (57%)

diff --git a/DrZ80_support.cpp b/DrZ80_support.c
similarity index 57%
rename from DrZ80_support.cpp
rename to DrZ80_support.c
index 344ecac..043058d 100644
--- a/DrZ80_support.cpp
+++ b/DrZ80_support.c
@@ -20,28 +20,28 @@
 #define INT_IRQ 0x01
 #define NMI_IRQ 0x08
 
-Z80_Regs Z80;
+struct Z80_Regs Z80;
 
-#define z80_int()          Z80.regs.Z80_IRQ = INT_IRQ
-#define z80_nmi()          Z80.regs.Z80IF |= NMI_IRQ
+#define Z80_INT()          Z80.regs.Z80_IRQ = INT_IRQ
+#define Z80_NMI()          Z80.regs.Z80IF |= NMI_IRQ
 
 static unsigned int z80_rebaseSP(unsigned short address)
 {
-    Z80.regs.Z80SP_BASE = (unsigned int)&mainram[0x3000];
-	Z80.regs.Z80SP = Z80.regs.Z80SP_BASE + address;
-	return Z80.regs.Z80SP_BASE + address;
+   Z80.regs.Z80SP_BASE = (unsigned int)&mainram[0x3000];
+   Z80.regs.Z80SP = Z80.regs.Z80SP_BASE + address;
+   return Z80.regs.Z80SP_BASE + address;
 }
 
 static unsigned int z80_rebasePC(unsigned short address)
 {
-    Z80.regs.Z80PC_BASE = (unsigned int)&mainram[0x3000];
-	Z80.regs.Z80PC = Z80.regs.Z80PC_BASE + address;
-    return Z80.regs.Z80PC_BASE + address;
+   Z80.regs.Z80PC_BASE = (unsigned int)&mainram[0x3000];
+   Z80.regs.Z80PC = Z80.regs.Z80PC_BASE + address;
+   return Z80.regs.Z80PC_BASE + address;
 }
 
 static void z80_irq_callback(void)
 {
-    Z80.regs.Z80_IRQ = 0x00;
+   Z80.regs.Z80_IRQ = 0x00;
 }
 
 
@@ -50,36 +50,36 @@ static void z80_irq_callback(void)
  ****************************************************************************/
 void Z80_Reset(void)
 {
-    memset (&Z80, 0, sizeof(Z80_Regs));
-    Z80.regs.z80_rebasePC=z80_rebasePC;
-    Z80.regs.z80_rebaseSP=z80_rebaseSP /* 0 */;
-    Z80.regs.z80_read8   =z80MemReadB; /* z80_read8 */
-    Z80.regs.z80_read16  =z80MemReadW;
-    Z80.regs.z80_write8  =DrZ80ngpMemWriteB;
-    Z80.regs.z80_write16 =DrZ80ngpMemWriteW;
-    Z80.regs.z80_in      =DrZ80ngpPortReadB;
-    Z80.regs.z80_out     =DrZ80ngpPortWriteB;
-    
-    Z80.regs.z80_irq_callback=z80_irq_callback;
-    Z80.regs.Z80BC = 0013;
-    Z80.regs.Z80DE = 0x00D8;
-    Z80.regs.Z80HL = 0x014D;
-    
-    Z80.regs.Z80PC=Z80.regs.z80_rebasePC(0);
-    Z80.regs.Z80SP=Z80.regs.z80_rebaseSP(0xFFFE);
+   memset (&Z80, 0, sizeof(struct Z80_Regs));
+   Z80.regs.z80_rebasePC=z80_rebasePC;
+   Z80.regs.z80_rebaseSP=z80_rebaseSP /* 0 */;
+   Z80.regs.z80_read8   =z80MemReadB; /* z80_read8 */
+   Z80.regs.z80_read16  =z80MemReadW;
+   Z80.regs.z80_write8  =DrZ80ngpMemWriteB;
+   Z80.regs.z80_write16 =DrZ80ngpMemWriteW;
+   Z80.regs.z80_in      =DrZ80ngpPortReadB;
+   Z80.regs.z80_out     =DrZ80ngpPortWriteB;
 
-    Z80_Clear_Pending_Interrupts();
+   Z80.regs.z80_irq_callback=z80_irq_callback;
+   Z80.regs.Z80BC = 0013;
+   Z80.regs.Z80DE = 0x00D8;
+   Z80.regs.Z80HL = 0x014D;
+
+   Z80.regs.Z80PC=Z80.regs.z80_rebasePC(0);
+   Z80.regs.Z80SP=Z80.regs.z80_rebaseSP(0xFFFE);
+
+   Z80_Clear_Pending_Interrupts();
 }
 
 void Z80_Cause_Interrupt(int type)
 {
    if (type == Z80_NMI_INT) 
    {
-      z80_nmi();
+      Z80_NMI();
    }
    else if (type != Z80_IGNORE_INT)
    {
-      z80_int();
+      Z80_INT();
    }
 }
 
@@ -91,7 +91,7 @@ void Z80_Clear_Pending_Interrupts(void)
 /****************************************************************************
  * Execute IPeriod T-states. Return number of T-states really executed
  ****************************************************************************/
-extern "C" int Z80_Execute(int cycles)
+int Z80_Execute(int cycles)
 {
     Z80.regs.cycles = cycles;
 
diff --git a/DrZ80_support.h b/DrZ80_support.h
index 39c2ad5..a9fcd20 100644
--- a/DrZ80_support.h
+++ b/DrZ80_support.h
@@ -5,7 +5,6 @@
 extern "C" {
 #endif
 
-
 #include "DrZ80.h"
 
 /****************************************************************************/
@@ -16,7 +15,7 @@ typedef struct {
 	struct DrZ80 regs;
 }   Z80_Regs;
 
-extern Z80_Regs Z80;
+extern struct Z80_Regs Z80;
 
 #define Z80_IGNORE_INT	-1 /* Ignore interrupt */
 #define Z80_NMI_INT 	-2    /* Execute NMI */
@@ -24,8 +23,8 @@ extern Z80_Regs Z80;
 
 extern unsigned Z80_GetPC (void); /* Get program counter */
 extern int Z80_GetPreviousPC (void);
-extern void Z80_GetRegs (Z80_Regs *Regs);  /* Get registers */
-extern void Z80_SetRegs (Z80_Regs *Regs);  /* Set registers */
+extern void Z80_GetRegs (struct Z80_Regs *Regs);  /* Get registers */
+extern void Z80_SetRegs (struct Z80_Regs *Regs);  /* Set registers */
 
 extern void Z80_Reset(void);
 extern int Z80_Execute(int cycles); /* Execute cycles T-States - returns number of cycles actually run */
diff --git a/Makefile.common b/Makefile.common
index c0eaeb2..32601a2 100644
--- a/Makefile.common
+++ b/Makefile.common
@@ -52,7 +52,7 @@ SOURCES_C += \
 
 ifeq ($(DRZ80),1)
 	FLAGS += -DDRZ80
-	SOURCES_CXX += $(CORE_DIR)/DrZ80_support.cpp
+	SOURCES_C   += $(CORE_DIR)/DrZ80_support.c
 	SOURCES_ASM := $(CORE_DIR)/DrZ80.s
 else
 	FLAGS += -DCZ80