/*
	Software License Agreement (BSD License)
	
	Copyright (c) 1997-2008, David Lindauer, (LADSoft).
	All rights reserved.
	
	Redistribution and use of this software in source and binary forms, with or without modification, are
	permitted provided that the following conditions are met:
	
	* Redistributions of source code must retain the above
	  copyright notice, this list of conditions and the
	  following disclaimer.
	
	* Redistributions in binary form must reproduce the above
	  copyright notice, this list of conditions and the
	  following disclaimer in the documentation and/or other
	  materials provided with the distribution.
	
	* Neither the name of LADSoft nor the names of its
	  contributors may be used to endorse or promote products
	  derived from this software without specific prior
	  written permission of LADSoft.
	
	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS OR IMPLIED
	WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
	PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
	ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
	LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
	INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
	TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
	ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include <windows.h>
#include <stdio.h>
#include <stdarg.h>
#include <string.h>

#include "conio.h"

int ungetchar;

static struct text_info the_info = { 0,0,80,25,7,7,0,25,80,0,0 };
static HANDLE inhand,outhand ;
#pragma startup conio_init 225
#pragma rundown conio_rundown 31

void textini(int mode);

static void conio_init(void)
{
	unsigned char mode;
	unsigned short curs;
	unsigned char atr;
   CONSOLE_SCREEN_BUFFER_INFO info ;
	int pos;
   inhand = CreateFile("CONIN$",GENERIC_READ,FILE_SHARE_READ|FILE_SHARE_WRITE,0,OPEN_EXISTING,0,0) ;
   outhand = CreateFile("CONOUT$",GENERIC_WRITE | GENERIC_READ,FILE_SHARE_READ|FILE_SHARE_WRITE,0,OPEN_EXISTING,0,0) ;
   GetConsoleScreenBufferInfo(outhand,&info) ;
   the_info.screenwidth = info.srWindow.Right - info.srWindow.Left+1 ;
   the_info.screenheight = info.srWindow.Bottom - info.srWindow.Top+1 ;
   the_info.curx = info.dwCursorPosition.X;
   the_info.cury = info.dwCursorPosition.Y;
   the_info.normattr = the_info.attribute = info.wAttributes;
		
	
}
static void conio_rundown(void)
{
   CloseHandle(inhand);
   CloseHandle(outhand) ;
}
int _RTL_FUNC kbhit(void)
{
	unsigned long read ;
	INPUT_RECORD r ;
			
			do {
            if (!GetNumberOfConsoleInputEvents(inhand, &read) || !read)
					return 0 ;
            if (!PeekConsoleInput(inhand,&r,1,&read) || !read)
					return 0 ;
            if (r.EventType != KEY_EVENT || !r.Event.KeyEvent.bKeyDown) { //  || !(r.Event.KeyEvent.uChar.AsciiChar)) {
               if (!ReadConsoleInput(inhand,&r,1,&read ) || !read)
                  return 0;
            } else {
               return 1 ;
            }
         } while (TRUE) ;
         return 0 ;
}
int _RTL_FUNC          getch( void )
{
	int rv;
   DWORD read ;
	INPUT_RECORD r ;
	if (ungetchar) {
		rv = ungetchar;
		ungetchar = 0;
	}
	else {
      while (!kbhit())
         Sleep(100) ;
      ReadConsoleInput(inhand,&r,1,&read ) ;
      rv = r.Event.KeyEvent.uChar.AsciiChar ;
	  if (rv == 0)
	  	ungetchar = r.Event.KeyEvent.wVirtualScanCode;
	}
	return rv;
}
static void biosmode(int oldmode, int newmode )
{
   SMALL_RECT r ;
   COORD cx ;
   if (oldmode < 2) 
      oldmode = 0 ;
   else if (oldmode < 8) 
      oldmode = 1 ;
   else
      oldmode = 2 ;
   if (newmode < 2) 
      newmode = 0 ;
   else if (newmode < 8) 
      newmode = 1 ;
   else
      newmode = 2 ;
   if (oldmode == newmode)
      return ;
   r.Left = r.Top = 0 ;
   cx.X = r.Right = the_info.screenwidth ;
   cx.Y = r.Bottom = the_info.screenheight ;
   if (oldmode > newmode) {
      SetConsoleWindowInfo(outhand,FALSE,&r) ;
//      SetConsoleScreenBufferSize(outhand,cx) ;
   } else {
      SetConsoleScreenBufferSize(outhand,cx) ;
//      SetConsoleWindowInfo(outhand,FALSE,&r) ;
   }
}
static void scrollup (int ytop)
{
   SMALL_RECT src,clip ;
   COORD dest ;
   CHAR_INFO atr ;
   src.Top = ytop + 1 + the_info.wintop ;
   src.Bottom = the_info.winbottom ;
   src.Left = the_info.winleft ;
   src.Right = the_info.winright ;
   clip = src ;
   clip.Top-- ;
   dest.X = src.Left ;
   dest.Y = clip.Top ;
   atr.Char.UnicodeChar = ' ' ;
   atr.Attributes = the_info.attribute ;
   ScrollConsoleScreenBuffer(outhand,&src,&clip,dest,&atr) ;
}
static void scrolldown (int ytop)
{
   SMALL_RECT src,clip ;
   COORD dest ;
   CHAR_INFO atr ;
   src.Top = ytop + the_info.wintop ;
   src.Bottom = the_info.winbottom-1 ;
   src.Left = the_info.winleft ;
   src.Right = the_info.winright ;
   clip = src ;
//   clip.Bottom++ ;
   dest.X = src.Left ;
   dest.Y = clip.Top+1 ;
   atr.Char.UnicodeChar = ' ' ;
   atr.Attributes = the_info.attribute ;
   ScrollConsoleScreenBuffer(outhand,&src,&clip,dest,&atr) ;
}

void _RTL_FUNC         clreol( void )
{
   DWORD written ;
   COORD cx ;
   cx.X = the_info.winleft + the_info.curx ;
   cx.Y = the_info.wintop + the_info.cury ;
//   FillConsoleOutputAttribute(outhand,the_info.attribute,
//      the_info.winright -the_info.winleft - the_info.curx,
//      cx,&written) ;   
   FillConsoleOutputCharacter(outhand,' ',
      the_info.winright - the_info.winleft - the_info.curx,
      cx,&written) ;   
}
void _RTL_FUNC         clrscr( void )
{
   int y;
	the_info.curx = 0;
	the_info.cury = 0;
   for (y=the_info.wintop; y < the_info.winbottom; y++) {
      clreol() ;
      the_info.cury++ ;
   }
   gotoxy(0,0) ;
}
void _RTL_FUNC         gotoxy( int __x, int __y )
{
   COORD pos ;
	the_info.curx = __x;
	the_info.cury = __y;
   pos.X = the_info.curx + the_info.winleft;
   pos.Y = the_info.cury + the_info.wintop ;
   SetConsoleCursorPosition(outhand,pos) ;
}
int _RTL_FUNC          getche( void )
{
	int inch = getch();
	putch(inch);
	return inch;
}
int _RTL_FUNC          putch( int __c )
{
   DWORD written ;
	switch (__c) {
		case 8:
		case 0x7f:
			the_info.curx--;
         gotoxy(the_info.curx,the_info.cury) ;
			break;
		case '\r':
			the_info.curx = 0;
         gotoxy(the_info.curx,the_info.cury) ;
			break;
		case 7:
         Beep(3000,300) ;
			break;
		case '\n':
			the_info.curx = 0;
         if (++the_info.cury >= the_info.winbottom - the_info.wintop) {
				the_info.cury--;
            if (the_info.winbottom < the_info.screenheight) 
               scrollup(0);
			}
         gotoxy(the_info.curx,the_info.cury) ;
			break;
		case '\t':
			the_info.curx += 8;
			the_info.curx &= 0xf8;
			if (the_info.curx >= the_info.winright - the_info.winleft) {
				the_info.curx = 0;
            if (++the_info.cury >= the_info.winbottom - the_info.wintop) {
					the_info.cury--;
               if (the_info.winbottom < the_info.screenheight) 
                  scrollup(0);
				}
			}
         gotoxy(the_info.curx,the_info.cury) ;
			break;
		default:
         WriteConsole(outhand,&__c,1,&written,0) ;
			if (++the_info.curx >= the_info.winright - the_info.winleft) {
				the_info.curx = 0;
            if (++the_info.cury >= the_info.winbottom - the_info.wintop) {
               the_info.cury--;
               if (the_info.cury < the_info.screenheight-1) 
                  scrollup(0);
				}
            gotoxy(the_info.curx,the_info.cury) ;
			}
			break;
	}
   return 0 ;
}
int _RTL_FUNC          wherex( void )
{
	return the_info.curx;
}
int _RTL_FUNC          wherey( void )
{
	return the_info.cury;
}
void _RTL_FUNC         delline( void )
{
	scrollup(the_info.cury);
}
int _RTL_FUNC          gettext( int __left, int __top,
                           int __right, int __bottom,
                           void *__destin)
{
   CHAR_INFO info[50*80] ;
   COORD destsize,destlt ;
   SMALL_RECT src ; 
   int i ;
   short *dest =__destin ;
   destsize.X =__right - __left ;
   destsize.Y = __bottom - __top ;
   destlt.X = 0 ;
   destlt.Y = 0 ;
   src.Left = __left ;
   src.Right = __right ;
   src.Top = __top ;
   src.Bottom = __bottom ;
   ReadConsoleOutput(outhand,&info[0],destsize,destlt,&src) ;
   for (i=0; i < destsize.X * destsize.Y; i++)
      *dest++ = info[i].Char.AsciiChar + (info[i].Attributes << 8) ;
   return 0 ;
}
void _RTL_FUNC         gettextinfo (struct text_info *__r )
{
	*__r = the_info;
}
static void newatr(void)
{
   SetConsoleTextAttribute(outhand, the_info.attribute) ;
}
void _RTL_FUNC         highvideo( void )
{
	the_info.attribute |= BLINK;
   newatr() ;
}
void _RTL_FUNC         insline( void )
{
	scrolldown(the_info.cury);
}
void _RTL_FUNC         lowvideo( void )
{
	the_info.attribute &= ~BLINK;
   newatr() ;
}
int _RTL_FUNC          movetext( int __left, int __top,
                            int __right, int __bottom,
                            int __destleft, int __desttop ) 
{
   CHAR_INFO info[50*80] ;
   COORD destsize,destlt ;
   SMALL_RECT src ; 
   int i ;
   destsize.X =__right - __left ;
   destsize.Y = __bottom - __top ;
   destlt.X = 0 ;
   destlt.Y = 0 ;
   src.Left = __left ;
   src.Right = __right ;
   src.Top = __top ;
   src.Bottom = __bottom ;
   ReadConsoleOutput(outhand,&info[0],destsize,destlt,&src) ;
   src.Left = __destleft ;
   src.Right = __destleft + __right - __left ;
   src.Top = __desttop ;
   src.Bottom = __desttop + __bottom - __top ;
   WriteConsoleOutput(outhand,&info[0],destsize,destlt,&src) ;
   return 0 ;
}
void _RTL_FUNC         normvideo( void )
{
	the_info.attribute = the_info.normattr;
   newatr() ;
}
int _RTL_FUNC          puttext( int __left, int __top,
                           int __right, int __bottom,
                           void *__source )
{
   int i ;
   CHAR_INFO info[50*80] ;
   COORD sourcesize,sourcelt ;
   SMALL_RECT dest ; 
   short *source =__source ;
   sourcesize.X =__right - __left ;
   sourcesize.Y = __bottom - __top ;
   sourcelt.X = 0 ;
   sourcelt.Y = 0 ;
   dest.Left = __left ;
   dest.Right = __right ;
   dest.Top = __top ;
   dest.Bottom = __bottom ;
   for (i=0; i < sourcesize.X * sourcesize.Y ; i++) {
      info[i].Char.AsciiChar = *source & 0xff ;
      info[i].Attributes = *source++ >> 8 ;
   }
   WriteConsoleOutput(outhand,&info[0],sourcesize,sourcelt,&dest) ;
   return 0 ;
}
void _RTL_FUNC         textattr( int __newattr )
{
	the_info.attribute = __newattr;
   newatr() ;
}
void _RTL_FUNC         textbackground( int __newcolor )
{
	the_info.attribute &= 0xf;
	the_info.attribute |= __newcolor << 4;
   newatr() ;
}
void _RTL_FUNC         textcolor( int __newcolor )
{
	the_info.attribute &= 0xf0;
	the_info.attribute |= __newcolor & 0xf;
   newatr() ;
}
static void textini(int __newmode)
{
   int oldmode ;
	the_info.winleft = the_info.wintop = 0;
   the_info.screenheight = the_info.winbottom = 25;
   oldmode = the_info.currmode ;
	the_info.currmode = __newmode;
	switch (__newmode) {
		case 0:
		case 1:
         the_info.winright = 40;
         the_info.screenwidth = 40;
			break;
		default:
		case 2:
		case 3:
		case 7:
         the_info.winright = 80;
         the_info.screenwidth = 80;
			break;
		case 64:
         the_info.winright = 80;
         the_info.screenwidth = 80 ;
         the_info.winbottom = 50;
			break;
	}
   biosmode(oldmode,__newmode) ;
}
void _RTL_FUNC         textmode( int __newmode )
{
	if (__newmode == LASTMODE)
		__newmode = the_info.currmode;
   gotoxy(0,0) ;
	textini(__newmode);
}
void _RTL_FUNC         window( int __left, int __top, int __right, int __bottom)
{
	the_info.winleft = __left;
	the_info.winright = __right;
	the_info.wintop = __top;
	the_info.winbottom = __bottom;
   gotoxy(0,0) ;
}

void _RTL_FUNC         _setcursortype( int __cur_t )
{
   CONSOLE_CURSOR_INFO info ;
	the_info.currmode = __cur_t;
	switch (__cur_t) {
		case _NOCURSOR:
         info.bVisible = FALSE ;
         info.dwSize = 1 ;
			break;
		case _SOLIDCURSOR:
         info.bVisible = TRUE ;
         info.dwSize = 99 ;
			break;
		case _NORMALCURSOR:
      default :
         info.bVisible = TRUE ;
         info.dwSize = 5 ;
			break;
	}
   SetConsoleCursorInfo(outhand,&info) ;
}
char *_RTL_FUNC        cgets( char *__str )
{
	char *q = __str;
	int val;
	while ((val = getche()) != '\r')
		*q++ = val;
	*q++ = 0;
	return __str;
}
int _RTL_FUNC          cprintf( const char *__format, ... )
{
	char buf[1024];
	va_list argptr;

	va_start( argptr, __format);
	vsprintf( buf,__format, argptr);
	va_end(argptr);
	cputs(buf);
	return 0;
}
int	_RTL_FUNC       cputs( const char *__str)
{
	for (; *__str; __str++) {
		putch(*__str);
	}
	return 0;
}
#ifndef VSDLL
int _RTL_FUNC          cscanf( const char *__format, ... )
{
	va_list argptr;
	char buf[256];
	cgets(buf);
	va_start( argptr, __format);
	vsscanf( buf,__format, argptr);
	va_end(argptr);
	return 0;
}
#endif
char *_RTL_FUNC        getpass( const char *__prompt )
{
	static char passbuf[256];
	char *q = passbuf;
	int inch;
	cputs(__prompt);
	inch = getch();
	while (inch != 13) {
		switch (inch) {
			case 8:
			case 0x7f:
				if (q == passbuf)
               Beep(3000,300) ;
				else {
					putch(8);
					putch(' ');
					putch(8);
					q--;
				}
				break;
			default:
				if (inch < 0x20 || inch > 0x7f)
               Beep(3000,300) ;
				else {
					cputs("*");
					*q++ = inch;
				}
				break;
		}
		inch = getch();
				
	}
	*q = 0;
	return passbuf;
}
int _RTL_FUNC          ungetch( int __ch )
{
	ungetchar = __ch;
}
unsigned char _RTL_FUNC    inportb( unsigned __portid )
{
	asm  mov edx,[__portid];
	asm  in al,dx;
	asm  movzx eax,al;
	return _EAX;
}
unsigned _RTL_FUNC         inport ( unsigned __portid )
{
	asm  mov edx,[__portid];
	asm  in ax,dx;
	asm  movzx eax,ax;
	return _EAX;
}
unsigned _RTL_FUNC         inportd ( unsigned __portid )
{
	asm  mov edx,[__portid];
	asm  in eax,dx;
	return _EAX;
}
int _RTL_FUNC              inp( unsigned __portid )
{
	asm  mov edx,[__portid];
	asm  in ax,dx;
	asm  movsx eax,ax;
	return _EAX;
}
unsigned _RTL_FUNC         inpw( unsigned __portid )
{
	asm  mov edx,[__portid];
	asm  in ax,dx;
	asm  movzx eax,ax;
	return _EAX;
}
void _RTL_FUNC             outportb( unsigned __portid, unsigned char __value )
{
	asm mov edx,[__portid];
	asm mov al,[__value];
	asm out dx,al;
}
void _RTL_FUNC             outport ( unsigned __portid, unsigned __value )
{
	asm mov edx,[__portid];
	asm mov ax,word ptr [__value];
	asm out dx,ax;
}
void _RTL_FUNC             outportd ( unsigned __portid, unsigned __value )
{
	asm mov edx,[__portid];
	asm mov eax,dword ptr [__value];
	asm out dx,eax;
}
int _RTL_FUNC              outp( unsigned __portid, int __value )
{
	asm mov edx,[__portid];
	asm mov al,byte ptr [__value];
	asm out dx,al;
	return __value;
}
unsigned _RTL_FUNC         outpw( unsigned __portid, unsigned __value )
{
	asm mov edx,[__portid];
	asm mov ax,word ptr [__value];
	asm out dx,ax;
	return __value;
}
#ifdef XXXXX
main()
{
   short buf[80*50] ;
   conio_init() ;
//   window(5,5,20,20) ;
   clrscr() ;
   textcolor(RED) ;
   _setcursortype(_NORMALCURSOR) ;
   cputs("hello there david let us see if this fits in the window") ;
   while(1) cputs("x") ;
   cgets(buf) ;
   movetext(5,5,20,20,30,6) ;
   getch() ;
   conio_rundown() ;
}
#endif