From 3cf17ecef2ac48e92910ac971fec9ea5b3eeb1d3 Mon Sep 17 00:00:00 2001
From: Ian C <ianc@noddybox.co.uk>
Date: Fri, 12 Dec 2008 00:19:08 +0000
Subject: Implemented snapshots and SAVE.

---
 source/zx81.c | 46 ++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 38 insertions(+), 8 deletions(-)

(limited to 'source/zx81.c')

diff --git a/source/zx81.c b/source/zx81.c
index 00d6015..b8143cd 100644
--- a/source/zx81.c
+++ b/source/zx81.c
@@ -62,6 +62,7 @@
 #define SLOW_TSTATES	16000
 #define FAST_TSTATES	64000
 
+#define E_LINE		16404
 #define LASTK1		16421
 #define LASTK2		16422
 #define MARGIN		16424
@@ -103,6 +104,7 @@ static Z80Word		RAMTOP=0;
 /* Tape
 */
 static int		enable_filesystem;
+static int		allow_save;
 static const Z80Byte	*tape_image;
 static int		tape_len;
 
@@ -254,12 +256,13 @@ static Z80Byte FromASCII(char c)
 
 /* Open a tape file the passed address
 */
-static FILE *OpenTapeFile(Z80Word addr, int *cancelled)
+static FILE *OpenTapeFile(Z80Word addr, int *cancelled, const char *mode)
 {
     static const char zx_chars[] = "\"#$:?()><=+-*/;,."
 				   "0123456789"
 				   "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
     FILE *fp;
+    char full_fn[FILENAME_MAX] = DEFAULT_SNAPDIR;
     char fn[FILENAME_MAX];
     int f;
     int done;
@@ -291,7 +294,7 @@ static FILE *OpenTapeFile(Z80Word addr, int *cancelled)
     {
     	if (GUI_FileSelect(last_dir,fn,".P"))
 	{
-	    fp = fopen(fn,"rb");
+	    fp = fopen(fn, mode);
 	}
 	else
 	{
@@ -306,12 +309,11 @@ static FILE *OpenTapeFile(Z80Word addr, int *cancelled)
 	fn[f++] = 'P';
 	fn[f] = 0;
 
-	if (!(fp = fopen(fn,"rb")))
-	{
-	    char full_fn[FILENAME_MAX] = DEFAULT_SNAPDIR;
+	strcat(full_fn,fn);
 
-	    strcat(full_fn,fn);
-	    fp = fopen(full_fn,"rb");
+	if (!(fp = fopen(full_fn, mode)))
+	{
+	    fp = fopen(fn, mode);
 	}
     }
 
@@ -339,6 +341,21 @@ static void LoadExternalTape(FILE *tape, Z80 *z80)
 }
 
 
+static void SaveExternalTape(FILE *tape, Z80 *z80)
+{
+    int f;
+    int end;
+
+    f = 0x4009;
+    end = WORD(E_LINE);
+
+    while(f <= end)
+    {
+    	fputc(mem[f++], tape);
+    }
+}
+
+
 static void ClearBitmap(void)
 {
     uint16 *s;
@@ -744,6 +761,17 @@ static int EDCallback(Z80 *z80, Z80Val data)
     switch((Z80Byte)data)
     {
     	case ED_SAVE:
+	    if (allow_save && z80->DE.w<0x8000)
+	    {
+		FILE *fp;
+		int cancel;
+
+		if ((fp=OpenTapeFile(z80->HL.w, &cancel, "wb")))
+		{
+		    SaveExternalTape(fp,z80);
+		    fclose(fp);
+		}
+	    }
 	    break;
 
     	case ED_LOAD:
@@ -757,7 +785,7 @@ static int EDCallback(Z80 *z80, Z80Val data)
 		FILE *fp;
 		int cancel;
 
-		if ((fp=OpenTapeFile(z80->DE.w,&cancel)))
+		if ((fp=OpenTapeFile(z80->DE.w, &cancel, "rb")))
 		{
 		    LoadExternalTape(fp,z80);
 		    fclose(fp);
@@ -1068,6 +1096,8 @@ void ZX81Reconfigure(void)
     	RAMBOT = 0x4000;
 	memcpy(mem+ROMLEN,mem,ROMLEN);
     }
+
+    allow_save = enable_filesystem && DS81_Config[DS81_ALLOW_TAPE_SAVE];
 }
 
 
-- 
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