Updates from work away

3 files changed, 249 insertions, 10 deletions

diff --git a/source/gui.c b/source/gui.c
index 91c7f8d..713ad02 100644
--- a/source/gui.c
+++ b/source/gui.c
@@ -116,3 +116,76 @@ int GUI_Menu(const char *opts[])
     return sel;
 }
 
+
+void GUI_Alert(int fatal, const char *text)
+{
+    char line[80];
+    int h;
+    const char *p;
+    char *d;
+
+    h=40;
+    p=text;
+
+    while(*p)
+    {
+    	if (*p++=='\n')
+	{
+	    h+=8;
+	}
+    }
+
+    FB_FillBox(0,0,SCREEN_WIDTH,h,FB_RGB(0,0,0));
+    FB_Box(1,1,SCREEN_WIDTH-2,h-2,FB_RGB(31,0,0));
+
+    p=text;
+    h=4;
+    d=line;
+
+    while(*p)
+    {
+    	if (*p=='\n')
+	{
+	    *d++=0;
+	    p++;
+	    FB_Centre(line,h,FB_RGB(31,31,31),-1);
+	    h+=8;
+	    d=line;
+	}
+	else
+	{
+	    *d++=*p++;
+	}
+    }
+
+    if (d>line)
+    {
+	*d=0;
+	FB_Centre(line,h,FB_RGB(31,31,31),-1);
+	h+=8;
+    }
+
+    if (!fatal)
+    {
+	FB_Centre("PRESS ANY BUTTON OR SCREEN",h+16,FB_RGB(31,31,0),-1);
+
+	while(!keysDown())
+	{
+	    swiWaitForVBlank();
+	}
+
+	while(keysHeld())
+	{
+	    swiWaitForVBlank();
+	}
+    }
+    else
+    {
+	FB_Centre("PLEASE RESET YOUR CONSOLE",h+16,FB_RGB(31,31,0),-1);
+
+	while(1)
+	{
+	    swiWaitForVBlank();
+	}
+    }
+}
diff --git a/source/main.c b/source/main.c
index 1da90c2..1a3aa8c 100644
--- a/source/main.c
+++ b/source/main.c
@@ -22,7 +22,9 @@
 
 #include <stdlib.h>
 #include <stdio.h>
+#include <string.h>
 #include <nds.h>
+#include <fat.h>
 
 #include "framebuffer.h"
 #include "gui.h"
@@ -42,6 +44,7 @@ static const char *main_menu[]=
 	    "Select Tape",
 	    "Sticky Shift On",
 	    "Sticky Shift Off",
+	    "Map Joypad to Keys",
 	    "Cancel",
 	    NULL
 	};
@@ -52,6 +55,7 @@ typedef enum
     MenuSelectTape,
     MenuStickyOn,
     MenuStickyOff,
+    MenuMapJoypad
 } MenuOpt;
 
 
@@ -74,11 +78,17 @@ static void Splash(void)
 	"PRESS A TO CONTINUE",
 	" ",
 	"http://www.noddybox.co.uk/",
+	" ",
+	" ",
+	" ",
+	" ",
+	"Checking for FAT device...",
 	NULL
     };
 
     sImage img;
     int f;
+    int y;
 
     FB_Clear();
 
@@ -87,9 +97,53 @@ static void Splash(void)
 
     FB_Blit(&img,0,0);
 
+    y=10;
+
     for(f=0;text[f];f++)
     {
-	FB_Centre(text[f],10+f*8,FB_RGB(31,31,31),-1);
+	FB_Centre(text[f],y,FB_RGB(31,31,31),-1);
+	y+=8;
+    }
+
+    y+=8;
+
+    if (fatInitialise(32,true))
+    {
+	ZX81EnableFileSystem(TRUE);
+
+	FB_Centre("Found a FAT device.",y,FB_RGB(31,31,31),-1);
+	y+=8;
+
+	FB_Centre("If you place .P tape files in",y,FB_RGB(31,31,31),-1);
+	y+=8;
+
+	FB_Centre("the top directory or ZX81TAPE",y,FB_RGB(31,31,31),-1);
+	y+=8;
+
+	FB_Centre("then you should be able to load",y,FB_RGB(31,31,31),-1);
+	y+=8;
+
+	FB_Centre("GAME.P with the command",y,FB_RGB(31,31,31),-1);
+	y+=8;
+
+	FB_Centre("LOAD \"GAME\"",y,FB_RGB(31,31,31),-1);
+	y+=8;
+    }
+    else
+    {
+	ZX81EnableFileSystem(FALSE);
+
+	FB_Centre("Sorry, but you don't have a",y,FB_RGB(31,31,31),-1);
+	y+=8;
+
+	FB_Centre("supported FAT device.",y,FB_RGB(31,31,31),-1);
+	y+=8;
+
+	FB_Centre("Only the internal tape",y,FB_RGB(31,31,31),-1);
+	y+=8;
+
+	FB_Centre("files can be used.",y,FB_RGB(31,31,31),-1);
+	y+=8;
     }
 
     ZX81DisplayString("10 print '%the zx81 is ace%'\n20 goto 10");
@@ -153,7 +207,7 @@ int main(int argc, char *argv[])
 
     if (!z80)
     {
-    	return EXIT_FAILURE;
+	GUI_Alert(TRUE,"Failed to initialise\nthe Z80 CPU emulation!");
     }
 
     ZX81Init((uint16*)SCREEN_BASE_BLOCK(0), z80);
@@ -195,6 +249,10 @@ int main(int argc, char *argv[])
 			    case MenuStickyOff:
 				SK_SetSticky(SK_SHIFT,0);
 				break;
+
+			    case MenuMapJoypad:
+				SK_DisplayKeyboard(BG_GFX_SUB);
+			    	break;
 			}
 
 			SK_DisplayKeyboard(BG_GFX_SUB);
diff --git a/source/zx81.c b/source/zx81.c
index 0b7e729..6173701 100644
--- a/source/zx81.c
+++ b/source/zx81.c
@@ -19,7 +19,7 @@
 
     -------------------------------------------------------------------------
 
-    Provides the emulation for the ZX81
+    Provides the emulation for the zX81
 
 */
 #include <stdlib.h>
@@ -29,6 +29,7 @@
 #include <nds.h>
 
 #include "zx81.h"
+#include "gui.h"
 
 #include "zx81_bin.h"
 
@@ -40,6 +41,8 @@
 #define FALSE 0
 #endif
 
+#define MAX_FNAME_LEN	30
+
 
 /* ---------------------------------------- STATICS
 */
@@ -86,6 +89,7 @@ static Z80Word		RAMLEN=0;
 
 /* Tape
 */
+static int		enable_filesystem;
 static const Z80Byte	*tape_image;
 static int		tape_len;
 
@@ -244,17 +248,85 @@ static Z80Byte FromASCII(char c)
 }
 
 
-static void LoadTape(Z80 *z80)
+/* Open a tape file the passed address
+*/
+static FILE *OpenTapeFile(Z80Word addr)
 {
-    if (tape_image)
+    FILE *fp;
+    char fn[MAX_FNAME_LEN];
+    int f;
+    int done;
+
+    f=0;
+    done=FALSE;
+
+    while(f<(MAX_FNAME_LEN-3) && !done)
+    {
+    	int ch;
+
+	ch=mem[addr++];
+
+	if (ch&0x80)
+	{
+	    done=TRUE;
+	    ch&=0x7f;
+	}
+
+	switch(ch)
+	{
+	    case 22:
+	    	fn[f++]='-';
+		break;
+
+	    case 27:
+	    	fn[f++]='.';
+
+	    default:
+		if (ch>=28 && ch<=37)
+		{
+		    fn[f++]='0'+(ch-28);
+		}
+		else if (ch>=38 && ch<=63)
+		{
+		    fn[f++]='A'+(ch-38);
+		}
+		break;
+	}
+    }
+
+    fn[f++]='.';
+    fn[f++]='P';
+    fn[f]=0;
+
+    if (!(fp=fopen(fn,"rb")))
     {
-	memcpy(mem+0x4009,tape_image,tape_len);
+	char full_fn[MAX_FNAME_LEN+11]="\\ZX81SNAP\\";
+
+	strcat(full_fn,fn);
+	fp=fopen(full_fn,"rb");
     }
+
+    return fp;
 }
 
 
-static void SaveTape(Z80 *z80)
+static void LoadInternalTape(Z80 *z80)
 {
+    memcpy(mem+0x4009,tape_image,tape_len);
+}
+
+
+static void LoadExternalTape(FILE *tape, Z80 *z80)
+{
+    int c;
+    Z80Byte *a;
+
+    a=mem+0x4009;
+
+    while((c=getc(tape))!=EOF)
+    {
+    	*a++=c;
+    }
 }
 
 
@@ -371,7 +443,6 @@ static void ZX81HouseKeeping(Z80 *z80)
 	}
     }
 
-    /* if ((lastk1 || lastk2) && (lastk1!=prev_lk1 || lastk2!=prev_lk2)) */
     if (lastk1 && (lastk1!=prev_lk1 || lastk2!=prev_lk2))
     {
     	mem[CDFLAG]|=1;
@@ -429,11 +500,42 @@ static int EDCallback(Z80 *z80, Z80Val data)
     switch((Z80Byte)data)
     {
     	case ED_SAVE:
-	    SaveTape(z80);
 	    break;
 
     	case ED_LOAD:
-	    LoadTape(z80);
+	    /* Try and load the external file if a name given.  Otherwise, we
+	       try the internal one.  Some of this is slightly dodgy -- it was
+	       never intended for the emulator to be doing any GUI related
+	       nonsense (like the alerts) but simply emulating.
+	    */
+	    if (enable_filesystem && z80->DE.w<0x8000)
+	    {
+		FILE *fp;
+
+		if ((fp=OpenTapeFile(z80->DE.w)))
+		{
+		    LoadExternalTape(fp,z80);
+		    fclose(fp);
+		}
+		else
+		{
+		    GUI_Alert(FALSE,"Couldn't open tape");
+		    SK_DisplayKeyboard(BG_GFX_SUB);
+		}
+	    }
+	    else
+	    {
+		if (tape_image)
+		{
+		    LoadInternalTape(z80);
+		}
+		else
+		{
+		    GUI_Alert(FALSE,"No tape image selected");
+		    SK_DisplayKeyboard(BG_GFX_SUB);
+		}
+	    }
+
 	    mem[CDFLAG]=0xc0;
 	    break;
 
@@ -629,6 +731,12 @@ void ZX81Reset(Z80 *z80)
 }
 
 
+void ZX81EnableFileSystem(int enable)
+{
+    enable_filesystem=enable;
+}
+
+
 void ZX81SetTape(const Z80Byte *image, int len)
 {
     tape_image=image;