Node:Overlay, Next:Pipe, Previous:MD5, Up:GPC Units
The following listing contains the interface of the Overlay unit.
This is just a dummy replacement for BP's Overlay unit, since
GPC doesn't need overlays.
{ Dummy BP compatible overlay unit for GPC
Copyright (C) 1998-2003 Free Software Foundation, Inc.
Author: Frank Heckenbach <frank@pascal.gnu.de>
This file is part of GNU Pascal.
GNU Pascal is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published
by the Free Software Foundation; either version 2, or (at your
option) any later version.
GNU Pascal 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. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with GNU Pascal; see the file COPYING. If not, write to the
Free Software Foundation, 59 Temple Place - Suite 330, Boston, MA
02111-1307, USA.
As a special exception, if you link this file with files compiled
with a GNU compiler to produce an executable, this does not cause
the resulting executable to be covered by the GNU General Public
License. This exception does not however invalidate any other
reasons why the executable file might be covered by the GNU
General Public License. }
{$gnu-pascal,I-}
{$if __GPC_RELEASE__ < 20030412}
{$error This unit requires GPC release 20030412 or newer.}
{$endif}
unit Overlay;
interface
const
OvrOK = 0;
OvrError = -1;
OvrNotFound = -2;
OvrNoMemory = -3;
OvrIOError = -4;
OvrNoEMSDriver = -5;
OvrNoEMSMemory = -6;
const
OvrEmsPages: Word = 0;
OvrTrapCount: Word = 0;
OvrLoadCount: Word = 0;
OvrFileMode: Byte = 0;
type
OvrReadFunc = function (OvrSeg: Word): Integer;
var
OvrReadBuf: OvrReadFunc;
OvrResult: Integer = 0;
procedure OvrInit (aFileName: String); attribute (name
= '_p_OvrInit');
procedure OvrInitEMS; attribute (name = '_p_OvrInitEMS');
procedure OvrSetBuf (Size: LongInt); attribute (name
= '_p_OvrSetBuf');
function OvrGetBuf: LongInt; attribute (name = '_p_OvrGetBuf');
procedure OvrSetRetry (Size: LongInt); attribute (name
= '_p_OvrSetRetry');
function OvrGetRetry: LongInt; attribute (name = '_p_OvrGetRetry');
procedure OvrClearBuf; attribute (name = '_p_OvrClearBuf');