{
    $Id$
    Copyright (c) 1999-2001 by the Free Pascal development team.

    Borland Pascal 7 Compatible CRT Unit for Netware, tested with
    Netware 4.11 and 5.1

    See the file COPYING.FPC, included in this distribution,
    for details about the copyright.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

 **********************************************************************}
{At initialization time, AutoScreenDestructionMode is set to true so after program termination
 no "press any key to close screen" is displayed. Also check for ctrl-c in readkey is disabled.
 To enable ctrl-c check, set CheckBreak to true before calling ReadKey.

 2001/04/13 armin: first version for netware, compilable, completely untested
 2001/04/14 armin: tested, seems to work
                   TextMode, Sound and NoSound are dummys, don't know how to
                   implement that for netware
}
unit crt;
interface

const
{ CRT modes }
  BW40          = 0;            { 40x25 B/W on Color Adapter }
  CO40          = 1;            { 40x25 Color on Color Adapter }
  BW80          = 2;            { 80x25 B/W on Color Adapter }
  CO80          = 3;            { 80x25 Color on Color Adapter }
  Mono          = 7;            { 80x25 on Monochrome Adapter }
  Font8x8       = 256;          { Add-in for ROM font }

{ Mode constants for 3.0 compatibility }
  C40           = CO40;
  C80           = CO80;

{ Foreground and background color constants }
  Black         = 0;
  Blue          = 1;
  Green         = 2;
  Cyan          = 3;
  Red           = 4;
  Magenta       = 5;
  Brown         = 6;
  LightGray     = 7;

{ Foreground color constants }
  DarkGray      = 8;
  LightBlue     = 9;
  LightGreen    = 10;
  LightCyan     = 11;
  LightRed      = 12;
  LightMagenta  = 13;
  Yellow        = 14;
  White         = 15;

{ Add-in for blinking }
  Blink         = 128;

var

{ Interface variables }
  CheckBreak: Boolean;    { Enable Ctrl-Break, supported on Netware }
  CheckEOF: Boolean;      { Enable Ctrl-Z, supported on Netware }
  DirectVideo: Boolean;   { Enable direct video addressing }
  CheckSnow: Boolean;     { Enable snow filtering }
  LastMode: Word;         { Current text mode }
  TextAttr: Byte;         { Current text attribute }
  WindMin: Word;          { Window upper left coordinates }
  WindMax: Word;          { Window lower right coordinates }
  
Const
  ScreenHeight : longint=25;
  ScreenWidth  : longint=80;
    
  ConsoleMaxX=80;
  ConsoleMaxY=25;

{ Interface procedures }
procedure AssignCrt(var F: Text);
function KeyPressed: Boolean;
function ReadKey: Char;
procedure TextMode(Mode: Integer);        {dummy function}
procedure Window(X1,Y1,X2,Y2: Byte);
procedure GotoXY(X,Y: Byte);
function WhereX: Byte;
function WhereY: Byte;
procedure ClrScr;
procedure ClrEol;
procedure InsLine;
procedure DelLine;
procedure TextColor(Color: Byte);
procedure TextBackground(Color: Byte);
procedure LowVideo;
procedure HighVideo;
procedure NormVideo;
procedure Delay(MS: Word);
procedure Sound(Hz: Word);                {dummy function}
procedure NoSound;                        {dummy function}

{Extra Functions}
procedure cursoron;
procedure cursoroff;
procedure cursorbig;


implementation

{$I nwsys.inc}


{$ASMMODE ATT}

var
  DelayCnt,
//  ScreenWidth,
//  ScreenHeight : longint;
  VidSeg : Word;

{
  definition of textrec is in textrec.inc
}
{$i textrec.inc}


{****************************************************************************
                           Low level Routines
****************************************************************************}

procedure setscreenmode(mode : byte);
begin
end;


function GetScreenHeight : longint;
VAR Height, Width : WORD;
begin
 _GetSizeOfScreen (Height,Width);
  GetScreenHeight := Height;
end;


function GetScreenWidth : longint;
VAR Height, Width : WORD;
begin
 _GetSizeOfScreen (Height,Width);
  GetScreenWidth := Width;
end;


procedure GetScreenCursor(var x,y : longint);
begin
  x := _wherex+1;
  y := _wherey+1;
end;


{****************************************************************************
                              Helper Routines
****************************************************************************}

Function WinMinX: Longint;
{
  Current Minimum X coordinate
}
Begin
  WinMinX:=(WindMin and $ff)+1;
End;



Function WinMinY: Longint;
{
  Current Minimum Y Coordinate
}
Begin
  WinMinY:=(WindMin shr 8)+1;
End;



Function WinMaxX: Longint;
{
  Current Maximum X coordinate
}
Begin
  WinMaxX:=(WindMax and $ff)+1;
End;



Function WinMaxY: Longint;
{
  Current Maximum Y coordinate;
}
Begin
  WinMaxY:=(WindMax shr 8) + 1;
End;


Function FullWin:boolean;
{
  Full Screen 80x25? Window(1,1,80,25) is used, allows faster routines
}
begin
  FullWin:=(WinMinX=1) and (WinMinY=1) and
           (WinMaxX=ScreenWidth) and (WinMaxY=ScreenHeight);
end;


{****************************************************************************
                             Public Crt Functions
****************************************************************************}


procedure textmode(mode : integer);
begin
  Window (1,1,ScreenWidth,ScreenHeight);
  ClrScr;
end;


Procedure TextColor(Color: Byte);
{
  Switch foregroundcolor
}
Begin
  TextAttr:=(Color and $f) or (TextAttr and $70);
  If (Color>15) Then TextAttr:=TextAttr Or Blink;
End;



Procedure TextBackground(Color: Byte);
{
  Switch backgroundcolor
}
Begin
  TextAttr:=((Color shl 4) and ($f0 and not Blink)) or (TextAttr and ($0f OR Blink) );
End;



Procedure HighVideo;
{
  Set highlighted output.
}
Begin
  TextColor(TextAttr Or $08);
End;



Procedure LowVideo;
{
  Set normal output
}
Begin
  TextColor(TextAttr And $77);
End;



Procedure NormVideo;
{
  Set normal back and foregroundcolors.
}
Begin
  TextColor(7);
  TextBackGround(0);
End;


Procedure GotoXy(X: Byte; Y: Byte);
{
  Go to coordinates X,Y in the current window.
}
Begin
  If (X>0) and (X<=WinMaxX- WinMinX+1) and
     (Y>0) and (Y<=WinMaxY-WinMinY+1) Then
   Begin
     X := X + WinMinX - 1;
     Y := Y + WinMinY - 1;
     _GotoXY (x-1,y-1);
   End;
End;


Procedure Window(X1, Y1, X2, Y2: Byte);
{
  Set screen window to the specified coordinates.
}
Begin
  if (X1>X2) or (X2>ScreenWidth) or
     (Y1>Y2) or (Y2>ScreenHeight) then
   exit;
  WindMin:=((Y1-1) Shl 8)+(X1-1);
  WindMax:=((Y2-1) Shl 8)+(X2-1);
  GoToXY(1,1);
End;


Procedure ClrScr;
{
  Clear the current window, and set the cursor on 1,1
}
var
  fil : word;
  y   : longint;
  p   : pointer;
  rowlen,rows: longint;
begin
  fil:=32 or (textattr shl 8);
  if FullWin then
  begin
    _clrscr;  {seems to swich cursor off}
    _DisplayInputCursor;
  end else
   begin
     rowlen := WinMaxX-WinMinX+1;
     rows   := WinMaxY-WinMinY+1;
     GetMem (p, rows * rowlen * 2);
     FillWord (p^, rows * rowlen, fil);
     _CopyToScreenMemory (rows,rowlen,p,WinMinX-1,WinMinY-1);
     FreeMem (p, rows * rowlen * 2);
   end;
  Gotoxy(1,1);
end;


Procedure ClrEol;
{
  Clear from current position to end of line.
}
var
  x,y : longint;
  fil : word;
  rowlen : word;
  p      : pointer;
Begin
  GetScreenCursor(x,y);
  fil:=32 or (textattr shl 8);
  if x<WinMaxX then
  begin
    rowlen := WinMaxX-x+1;
    GetMem (p, rowlen * 2);
    FillWord (p^, rowlen, fil);
    _CopyToScreenMemory (1,rowlen,p,x-1,y-1);
    FreeMem (p, rowlen * 2);
  end;
End;



Function WhereX: Byte;
{
  Return current X-position of cursor.
}
var
  x,y : longint;
Begin
  GetScreenCursor(x,y);
  WhereX:=x-WinMinX+1;
End;



Function WhereY: Byte;
{
  Return current Y-position of cursor.
}
var
  x,y : longint;
Begin
  GetScreenCursor(x,y);
  WhereY:=y-WinMinY+1;
End;


{*************************************************************************
                            Keyboard
*************************************************************************}

var
   is_last : boolean;

function readkey : char;
var
  char1 : char;
begin
  if is_last then
  begin
     is_last:=false;
     readkey:=_getch;
  end else
  begin
    _SetCtrlCharCheckMode (CheckBreak);
    char1 := _getch;
    if char1 = #0 then is_last := true;
    readkey:=char1;
  end;
end;


function keypressed : boolean;
begin
  if is_last then
  begin
    keypressed:=true;
    exit;
  end else
    keypressed := (_kbhit <> 0);
end;


{*************************************************************************
                                   Delay
*************************************************************************}

procedure Delay(MS: Word);
begin
  _delay (MS);
end;


procedure sound(hz : word);
begin
  _RingTheBell;
end;


procedure nosound;
begin
end;



{****************************************************************************
                          HighLevel Crt Functions
****************************************************************************}

procedure removeline(y : longint);
var
  fil : word;
  rowlen : word;
  p : pointer;
begin
  fil:=32 or (textattr shl 8);
  rowlen:=WinMaxX-WinMinX+1;
  GetMem (p, rowlen*2);
  y:=WinMinY+y-1;
  While (y<=WinMaxY) do
   begin
     _CopyFromScreenMemory (1,rowlen,p,WinMinX-1,y);
     _CopyToScreenMemory (1,rowlen,p,WinMinX-1,y-1);
     inc(y);
   end;
  FillWord (p^,rowlen,fil);
  _CopyToScreenMemory (1,rowlen,p,WinMinX-1,WinMaxY-1);
  FreeMem (p, rowlen*2);
end;


procedure delline;
begin
  removeline(wherey);
end;


procedure insline;
var
  my,y : longint;
  fil : word;
  rowlen,x : word;
  p : pointer;
begin
  fil:=32 or (textattr shl 8);
  y:=WhereY-1;
  my:=WinMaxY-WinMinY;
  rowlen := WinMaxX-WinMinX+1;
  GetMem (p, rowlen*2);
  while (my>=y) do
   begin
     _CopyFromScreenMemory (1,rowlen,p,WinMinX-1,my);
     _CopyToScreenMemory (1,rowlen,p,WinMinX-1,my+1);
     dec(my);
   end;
  FillWord (p^,rowlen,fil);
  _CopyToScreenMemory (1,rowlen,p,x,y);
  FreeMem (p, rowlen*2);
end;




{****************************************************************************
                             Extra Crt Functions
****************************************************************************}

procedure cursoron;
begin
  if _IsColorMonitor <> 0 then
    _SetCursorShape (9,$A)
  else
    _SetCursorShape ($B,$D);
  _DisplayInputCursor;
end;


procedure cursoroff;
begin
  _HideInputCursor;
end;


procedure cursorbig;
begin
  _SetCursorShape (1,$A);
  _DisplayInputCursor;
end;


{*****************************************************************************
                          Read and Write routines
*****************************************************************************}

var
  CurrX,CurrY : longint;

Procedure WriteChar(c:char);
var
  w    : word;
begin
  case c of
   #10 : inc(CurrY);
   #13 : CurrX:=WinMinX;
    #8 : begin
           if CurrX>WinMinX then
            dec(CurrX);
         end;
    #7 : begin { beep }
           _RingTheBell;
         end;
  else
   begin
     w:=(textattr shl 8) or byte(c);
     _CopyToScreenMemory (1,1,@w,CurrX-1,CurrY-1);
     inc(CurrX);
   end;
  end;
  if CurrX>WinMaxX then
   begin
     CurrX:=WinMinX;
     inc(CurrY);
   end;
  while CurrY>WinMaxY do
   begin
     removeline(1);
     dec(CurrY);
   end;
end;


Function CrtWrite(var f : textrec):integer;
var
  i : longint;
begin
  GetScreenCursor(CurrX,CurrY);
  for i:=0 to f.bufpos-1 do
    WriteChar(f.buffer[i]);  { ad: may be better to use a buffer but i think it's fast enough }
  _GotoXY (CurrX-1,CurrY-1);
  f.bufpos:=0;
  CrtWrite:=0;
end;


Function CrtRead(Var F: TextRec): Integer;

  procedure BackSpace;
  begin
    if (f.bufpos>0) and (f.bufpos=f.bufend) then
     begin
       WriteChar(#8);
       WriteChar(' ');
       WriteChar(#8);
       dec(f.bufpos);
       dec(f.bufend);
     end;
  end;

var
  ch : Char;
Begin
  GetScreenCursor(CurrX,CurrY);
  f.bufpos:=0;
  f.bufend:=0;
  repeat
    if f.bufpos>f.bufend then
     f.bufend:=f.bufpos;
    _GotoXY (CurrX-1,CurrY-1);
    ch:=readkey;
    case ch of
    #0 : case readkey of
          #71 : while f.bufpos>0 do
                 begin
                   dec(f.bufpos);
                   WriteChar(#8);
                 end;
          #75 : if f.bufpos>0 then
                 begin
                   dec(f.bufpos);
                   WriteChar(#8);
                 end;
          #77 : if f.bufpos<f.bufend then
                 begin
                   WriteChar(f.bufptr^[f.bufpos]);
                   inc(f.bufpos);
                 end;
          #79 : while f.bufpos<f.bufend do
                 begin
                   WriteChar(f.bufptr^[f.bufpos]);
                   inc(f.bufpos);
                 end;
         end;
    ^S,
    #8 : BackSpace;
    ^Y,
   #27 : begin
           f.bufpos:=f.bufend;
           while f.bufend>0 do
            BackSpace;
         end;
   #13 : begin
           WriteChar(#13);
           WriteChar(#10);
           f.bufptr^[f.bufend]:=#13;
           f.bufptr^[f.bufend+1]:=#10;
           inc(f.bufend,2);
           break;
         end;
   #26 : if CheckEOF then
          begin
            f.bufptr^[f.bufend]:=#26;
            inc(f.bufend);
            break;
          end;
    else
     begin
       if f.bufpos<f.bufsize-2 then
        begin
          f.buffer[f.bufpos]:=ch;
          inc(f.bufpos);
          WriteChar(ch);
        end;
     end;
    end;
  until false;
  f.bufpos:=0;
  _GotoXY (CurrX-1,CurrY-1);
  CrtRead:=0;
End;


Function CrtReturn(Var F: TextRec): Integer;
Begin
  CrtReturn:=0;
end;


Function CrtClose(Var F: TextRec): Integer;
Begin
  F.Mode:=fmClosed;
  CrtClose:=0;
End;


Function CrtOpen(Var F: TextRec): Integer;
Begin
  If F.Mode=fmOutput Then
   begin
     TextRec(F).InOutFunc:=@CrtWrite;
     TextRec(F).FlushFunc:=@CrtWrite;
   end
  Else
   begin
     F.Mode:=fmInput;
     TextRec(F).InOutFunc:=@CrtRead;
     TextRec(F).FlushFunc:=@CrtReturn;
   end;
  TextRec(F).CloseFunc:=@CrtClose;
  CrtOpen:=0;
End;


procedure AssignCrt(var F: Text);
begin
  Assign(F,'');
  TextRec(F).OpenFunc:=@CrtOpen;
end;

var
  x,y : longint;
begin
{ Load startup values }
  ScreenWidth:=GetScreenWidth;
  ScreenHeight:=GetScreenHeight;
  lastmode := CO80;
  TextMode (lastmode);
  GetScreenCursor(x,y);
  if screenheight>25 then
    lastmode:=lastmode or $100;
  TextColor (LightGray);
  TextBackground (Black);
{ Redirect the standard output }
  assigncrt(Output);
  Rewrite(Output);
  TextRec(Output).Handle:=StdOutputHandle;
  assigncrt(Input);
  Reset(Input);
  TextRec(Input).Handle:=StdInputHandle;
  CheckBreak := FALSE;
  CheckEOF := FALSE;
  _SetCtrlCharCheckMode (CheckBreak);
  _SetAutoScreenDestructionMode (TRUE);
end.