{ COMP.PAS                  Copyright (c) TrSek alias Zdeno Sekerak }
{ Program v grafickej podobe zobrazi rozdiely medzi dvoma subormi.  }
{                                                                   }
{ Datum:28.05.96                               http://www.trsek.com }

program comp;
uses crt,dos,trsek;
var f,g:file of char;
    i,i1:integer;
    ch1,ch2,ch:char;
    s1,s2:string;
begin
 writeln;
 writeln('Compare two files                             Software by TRSEK');
 writeln('---------------------------------------------------------------');
 if paramcount<2 then begin
    writeln('Syntax: comp.exe %1 %2');
    writeln('         %1 - prvy subor');
    writeln('         %2 - druhy subor');
    halt(0);
 end;

 s1:=paramstr(1); s2:=paramstr(2);
 writeln('Compare ',s1,' with ',s2);

 assign(f,s1);
 assign(g,s2);
 {$I-}
 reset(f);
 if IOresult<>0 then begin
    writeln('Chyba pri citani suboru ',s1);
    halt(1);
 end;
 reset(g);
 if IOresult<>0 then begin
    writeln('Chyba pri citani suboru ',s2);
    halt(1);
 end;

 clrscr;
 open_win(1,1,80,12,s1,blue);
 open_win(1,12,80,23,s2,blue);
 textcolor(yellow);

 i1:=0;i:=0;ch:=#0;
 repeat
  i:=i+1;
  i1:=i1+1;
  read(f,ch1);
  read(g,ch2);
  if ch1<>ch2 then textbackground(green)
              else textbackground(blue);
  window(2,2,78,12);
  gotoxy(1+i-78*trunc(i/78),1+trunc(i/78));
  if ord(ch1)<>7 then write(ch1);
  if (ch1 in [#10]) then
     i:=78*trunc(i/78)+78;

  window(2,13,78,23);
  gotoxy(1+i1-78*trunc(i1/78),1+trunc(i1/78));
  if ord(ch2)<>7 then write(ch2);
  if (ch1 in [#10]) then
     i1:=78*trunc(i1/78)+78;

  if i>777 then begin
     i:=0;i1:=0;ch:=#0;
     KurzorZap(false);
     repeat
      ch:=readkey;
     until (ch in [#27,#13]);
     window(2,2,78,11);
     clrscr;
     window(2,13,78,22);
     clrscr;
  end;

 until (eof(f) or eof(g) or (ch=#27));
 KurzorZap(false);
end.