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### 8.14.20 BP compatibility: WinDos

The following listing contains the interface of the WinDos unit.

This is a portable implementation of most routines from BP's ``WinDos'` unit. A few routines that are Dos -- or even IA32 real mode -- specific, are only available if ``__BP_UNPORTABLE_ROUTINES__'` is defined, section 6.2 BP Incompatibilities.

The same functionality and much more is available in the Run Time System, section 8.13 Pascal declarations for GPC's Run Time System. The RTS routines usually have different names and/or easier and less limiting interfaces (e.g. ``ReadDir'` etc. vs. ``FindFirst'` etc.), and are often more efficient.

Therefore, using this unit is not recommended in newly written programs.

    { Mostly BP compatible portable WinDos unit

      This unit supports most, but not all, of the routines and
      declarations of BP's WinDos unit.

      Notes:

      - The procedures GetIntVec and SetIntVec are not supported since
        they make only sense for Dos real-mode programs (and GPC
        compiled programs do not run in real-mode, even on IA32 under
        Dos). The procedures Intr and MsDos are only supported under
        DJGPP if `__BP_UNPORTABLE_ROUTINES__' is defined (with the
        `-D__BP_UNPORTABLE_ROUTINES__' option). A few other routines are
        also only supported with this define, but on all platforms (but
        they are crude hacks, that's why they are not supported without
        this define).

      - The internal structure of file variables (TFileRec and TTextRec)
        is different in GPC. However, as far as TFDDs are concerned,
        there are other ways to achieve the same in GPC, see the GPC
        unit.

      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. }

    {$gnu-pascal,I-}
    {$if __GPC_RELEASE__ < 20020225}
    {$error This unit requires GPC release 20020225 or newer.}
    {$endif}

    { @@ Work-around for a problem with COFF debug info. Will hopefully
         disappear with qualified identifiers. }
    {$ifdef DJGPP}
    {$local W-} {$no-debug-info} {$endlocal}
    {$endif}

    unit WinDos;

    interface

    import GPC; System; Dos (FCarry     => Dos_FCarry,
                             FParity    => Dos_FParity,
                             FAuxiliary => Dos_FAuxiliary,
                             FZero      => Dos_FZero,
                             FSign      => Dos_FSign,
                             FOverflow  => Dos_FOverflow,
                             DosError   => Dos_DosError,
                             GetCBreak  => Dos_GetCBreak,
                             SetCBreak  => Dos_SetCBreak,
                             GetVerify  => Dos_GetVerify,
                             SetVerify  => Dos_SetVerify,
                             {$ifdef __BP_UNPORTABLE_ROUTINES__}
                             {$ifdef DJGPP}
                             Intr       => Dos_Intr,
                             MsDos      => Dos_MsDos,
                             {$endif}
                             DosVersion => Dos_DosVersion,
                             SetDate    => Dos_SetDate,
                             SetTime    => Dos_SetTime,
                             {$endif}
                             FindFirst  => Dos_FindFirst,
                             FindNext   => Dos_FindNext,
                             FindClose  => Dos_FindClose);

    const
      { File attribute constants }
      faReadOnly  = ReadOnly;
      faHidden    = Hidden;    { set for dot files except `.' and `..' }
      faSysFile   = SysFile;   { not supported }
      faVolumeID  = VolumeID;  { not supported }
      faDirectory = Directory;
      faArchive   = Archive;   { means: not executable }
      faAnyFile   = AnyFile;

      { Maximum file name component string lengths }
      fsPathName  = 79;
      fsDirectory = 67;
      fsFileName  = 8;
      fsExtension = 4;

      { FileSplit return flags }
      fcExtension = 1;
      fcFileName  = 2;
      fcDirectory = 4;
      fcWildcards = 8;

      { Flag bit masks -- only used by the unportable Dos routines }
      FCarry     = 1;
      FParity    = 4;
      FAuxiliary = $10;
      FZero      = $40;
      FSign      = $80;
      FOverflow  = $800;

    type
      PTextBuf = ^TTextBuf;
      TTextBuf = TextBuf;

      { Search record used by FindFirst and FindNext }
      TSearchRec = {$ifdef __BP_TYPE_SIZES__} packed {$endif} record
         Fill: SearchRecFill;
         Attr: Byte8;
         Time, Size: LongInt;
         Name: {$ifdef __BP_TYPE_SIZES__}
               packed array [0 .. 12] of Char
               {$else}
               TStringBuf
               {$endif};
         Reserved: SearchRec
      end;

      { Date and time record used by PackTime and UnpackTime }
      TDateTime = DateTime;

      { 8086 CPU registers -- only used by the unportable Dos routines }
      TRegisters = Registers;

    var
      { Error status variable }
      DosError: Integer; asmname '_p_DosError'; external;

    procedure GetDate (var Year, Month, Day, DayOfWeek: Word);
      asmname '_p_getdate';
    procedure GetTime (var Hour, Minute, Second, Sec100: Word);
      asmname '_p_gettime';
    procedure GetCBreak (var BreakOn: Boolean); asmname '_p_getcbreak';
    procedure SetCBreak (BreakOn: Boolean); asmname '_p_setcbreak';
    procedure GetVerify (var VerifyOn: Boolean); asmname '_p_getverify';
    procedure SetVerify (VerifyOn: Boolean); asmname '_p_setverify';
    function  DiskFree (Drive: Byte): LongInt; asmname '_p_diskfree';
    function  DiskSize (Drive: Byte): LongInt; asmname '_p_disksize';
    procedure GetFAttr (var F { @@ anyfile: GPC_AnyFile } ; var Attr:
      TDosAttr); asmname '_p_getfattr';
    procedure SetFAttr (var F { @@ anyfile: GPC_AnyFile } ; Attr:
      TDosAttr); asmname '_p_setfattr';
    procedure GetFTime (var F { @@ anyfile: GPC_AnyFile } ; var aTime:
      LongInt); asmname '_p_getftime';
    procedure SetFTime (var F { @@ anyfile: GPC_AnyFile } ; aTime:
      LongInt); asmname '_p_setftime';

    { FindFirst and FindNext are quite inefficient since they emulate
      all the brain-dead Dos stuff. If at all possible, the standard
      routines OpenDir, ReadDir and CloseDir (in the GPC unit) should be
      used instead. }
    procedure FindFirst (Path: PChar; Attr: Word; var SR: TSearchRec);
      asmname '_p_wfindfirst';
    procedure FindNext  (var SR: TSearchRec); asmname '_p_wfindnext';
    procedure FindClose (var SR: TSearchRec); asmname '_p_wfindclose';
    procedure UnpackTime (P: LongInt; var T: TDateTime);
      asmname '_p_unpacktime';
    procedure PackTime (const T: TDateTime; var P: LongInt);
      asmname '_p_packtime';
    function  FileSearch (Dest, Name, List: PChar): PChar;
      asmname '_p_wfilesearch';
    function  FileExpand (Dest, Name: PChar): PChar;
      asmname '_p_wfileexpand';
    function  FileSplit (Path, Dir, Name, Ext: PChar): Word;
      asmname '_p_wfilesplit';
    function  GetCurDir (Dir: PChar; Drive: Byte): PChar;
      asmname '_p_wgetcurdir';
    procedure SetCurDir (Dir: PChar); asmname '_p_wsetcurdir';
    procedure CreateDir (Dir: PChar); asmname '_p_wcreatedir';
    procedure RemoveDir (Dir: PChar); asmname '_p_wremovedir';
    function  GetArgCount: Integer; asmname '_p_wgetargcount';
    function  GetArgStr (Dest: PChar; ArgIndex: Integer; MaxLen: Word):
      PChar; asmname '_p_wgetargstr';
    function  GetEnvVar (VarName: PChar): PChar;
      asmname '_p_cstringgetenv';

    {$ifdef __BP_UNPORTABLE_ROUTINES__}
    {$ifdef DJGPP}
    procedure Intr (IntNo: Byte; var Regs: Registers);
      asmname '_p_intr';
    procedure MsDos (var Regs: Registers); asmname '_p_msdos';
    {$endif}
    function  DosVersion: Word; asmname '_p_dosversion';
    procedure SetDate (Year, Month, Day: Word); asmname '_p_setdate';
    procedure SetTime (Hour, Minute, Second, Sec100: Word);
      asmname '_p_settime';
    {$endif}

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