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) 1998-2005 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); procedure OvrInitEMS; procedure OvrSetBuf (Size: LongInt); function OvrGetBuf: LongInt; procedure OvrSetRetry (Size: LongInt); function OvrGetRetry: LongInt; procedure OvrClearBuf;