{
	$Id$
	This file is part of the Free Pascal run time library.
	Copyright (c) 1999-2000 by the Free Pascal development team.

	Includefile for objects.pp implementing OS-dependent file routines
	for Go32V1

	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.

 **********************************************************************
}

{This is the correct way to call external assembler procedures.}
procedure syscall;external name '___SYSCALL';

FUNCTION FileClose(Handle: THandle): word;
begin
   asm
	  xor  %bx,%bx
	  movw handle,%bx
	  movb $0x3e,%ah
	  call syscall
   end;
   FileClose := 0;
end;

FUNCTION FileOpen (Var FileName: AsciiZ; Mode: Word): THandle;
var
 AMode: word;
begin
  if Mode=stCreate then
	Begin
	  AMode:=$8302;
	end
  else
	Begin
	  Case (Mode and 3) of
	   0 : AMode:=$8001;
	   1 : AMode:=$8404;
	   2 : AMode:=$8404;
	  end;
	end;
   asm
	 xorl  %eax, %eax
	 movw  %ax, DosStreamError
	 movl  FileName, %ebx
	 movw  $0xff02, %ax
	 movw  AMode, %cx
	 call  syscall
	 jnc   .Lexit1
	 movw  %ax, DosStreamError                        { Hold Error  }
	 xorl  %eax, %eax                                 { Open Failed }
   .Lexit1:
	 movw  %ax, __RESULT
   END;
end;


FUNCTION SetFilePos (Handle: THandle; Pos: LongInt; MoveType: Word;
Var Actual: LongInt): Word;
Var
 val : longint;
BEGIN
  asm
	 movw MoveType, %ax;                              { Load move type }
	 movb $0x42, %ah;
	 movl pos, %edx;                              { Load file position }
	 movw Handle, %bx;                              { Load file handle }
	 call syscall
	 jc .Lexit4
	 movl    %eax,val                               { Update new position }
	 xorl %eax, %eax;
   .Lexit4:
	 movw %ax, DosStreamError                         { OS2 error returned }
   .Lend:
   END;
   Actual := val;
   SetFilePos := DosStreamError;                   { Return any error }
END;


FUNCTION FileRead (Handle: THandle; Var Buf; Count: Sw_Word;
Var Actual: Sw_Word): Word;
BEGIN
  asm
	 movl count,%ecx
	 movl buf,%edx
	 xorl %ebx,%ebx
	 movw handle,%bx
	 movb $0x3f,%ah
	 call syscall
	 jnc .LDOSREAD1
	 movw %ax,DosStreamError
	 xorl %eax,%eax
  .LDOSREAD1:
  end;
  Actual:=Count;
  FileRead:=DosStreamError;
end;


FUNCTION FileWrite (Handle: THandle; Var Buf; Count: Sw_Word; Var Actual: Sw_Word): Word;
BEGIN
  Actual:=0;
  asm
	 movl Count,%ecx
	 movl buf,%edx
	 xorl %ebx,%ebx
	 movw Handle,%bx
	 movb $0x40,%ah
	 call syscall
	 jnc .LDOSWRITE1
	 movw %ax,DosStreamError
  .LDOSWRITE1:
  end;
  Actual:=Count;
  FileWrite:=DosStreamError;
end;


function SetFileSize (Handle: THandle; FileSize: LongInt): Word;
var Actual, Buf: LongInt;
begin
    SetFileSize := 0;
    if FileSize > Position then
        begin
            SetFilePos (Handle, FileSize, 0, Actual);
            if (Actual = FileSize) then
                begin
{ Extend the file }
	            Actual := FileWrite (Handle, Buf, 0, Actual);
                    if Actual = -1 then
                        SetFileSize := 103;
                end
            else
                SetFileSize := 103;
        end
    else
        begin
            asm
                movl $0x7F25,%eax
                movl Handle,%ebx
                movl FileSize,%edx
                call syscall
                inc %eax
                movl %ecx, %eax
                jnz .LSetFSize1
                movl $0x4202,%eax
                movl Handle,%ebx
                movl $0,%edx
                call syscall
                jnc .LSetFSize2
.LSetFSize1:
                movw %ax,DosStreamError
.LSetFSize2:
            end;
            if DosStreamError <> 0 then SetFileSize := 103;
        end;
END;

{
  $Log$
  Revision 1.5  2000-06-04 14:17:28  hajny
    * SetFileSize fixed

  Revision 1.4  2000/02/09 16:59:33  peter
    * truncated log

  Revision 1.3  2000/01/07 16:41:48  daniel
    * copyright 2000

  Revision 1.2  2000/01/07 16:32:32  daniel
    * copyright 2000 added

}