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### 8.14.10 BP compatibility: Overlay

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) 1998-2002 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-}

    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;

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This document was generated by Frank Heckenbach on May, 10 2002 using texi2html