freepascal.compiler/rtl/os2/sysutils.pp

{

    This file is part of the Free Pascal run time library.
    Copyright (c) 1999-2000 by Florian Klaempfl
    member of the Free Pascal development team

    Sysutils unit for OS/2

    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.

 **********************************************************************}
unit sysutils;
interface

{$MODE objfpc}
{ force ansistrings }
{$H+}

uses
 Dos;

{$DEFINE HAS_SLEEP}
{ Include platform independent interface part }
{$i sysutilh.inc}


implementation

  uses
    sysconst;

{ Include platform independent implementation part }
{$i sysutils.inc}


{****************************************************************************
                        System (imported) calls
****************************************************************************}

(* "uses DosCalls" could not be used here due to type    *)
(* conflicts, so needed parts had to be redefined here). *)

type
        TFileStatus = object
        end;
        PFileStatus = ^TFileStatus;

        TFileStatus3 = object (TFileStatus)
            DateCreation,               {Date of file creation.}
            TimeCreation,               {Time of file creation.}
            DateLastAccess,             {Date of last access to file.}
            TimeLastAccess,             {Time of last access to file.}
            DateLastWrite,              {Date of last modification of file.}
            TimeLastWrite:word;         {Time of last modification of file.}
            FileSize,                   {Size of file.}
            FileAlloc:cardinal;         {Amount of space the file really
                                         occupies on disk.}
            AttrFile:cardinal;          {Attributes of file.}
        end;
        PFileStatus3=^TFileStatus3;

        TFileStatus4=object(TFileStatus3)
            cbList:cardinal;            {Length of entire EA set.}
        end;
        PFileStatus4=^TFileStatus4;

        TFileFindBuf3=object(TFileStatus)
            NextEntryOffset: cardinal;  {Offset of next entry}
            DateCreation,               {Date of file creation.}
            TimeCreation,               {Time of file creation.}
            DateLastAccess,             {Date of last access to file.}
            TimeLastAccess,             {Time of last access to file.}
            DateLastWrite,              {Date of last modification of file.}
            TimeLastWrite:word;         {Time of last modification of file.}
            FileSize,                   {Size of file.}
            FileAlloc:cardinal;         {Amount of space the file really
                                         occupies on disk.}
            AttrFile:cardinal;          {Attributes of file.}
            Name:shortstring;           {Also possible to use as ASCIIZ.
                                         The byte following the last string
                                         character is always zero.}
        end;
        PFileFindBuf3=^TFileFindBuf3;

        TFileFindBuf4=object(TFileStatus)
            NextEntryOffset: cardinal;  {Offset of next entry}
            DateCreation,               {Date of file creation.}
            TimeCreation,               {Time of file creation.}
            DateLastAccess,             {Date of last access to file.}
            TimeLastAccess,             {Time of last access to file.}
            DateLastWrite,              {Date of last modification of file.}
            TimeLastWrite:word;         {Time of last modification of file.}
            FileSize,                   {Size of file.}
            FileAlloc:cardinal;         {Amount of space the file really
                                         occupies on disk.}
            AttrFile:cardinal;          {Attributes of file.}
            cbList:longint;             {Size of the file's extended attributes.}
            Name:shortstring;           {Also possible to use as ASCIIZ.
                                         The byte following the last string
                                         character is always zero.}
        end;
        PFileFindBuf4=^TFileFindBuf4;

 TFSInfo = record
            case word of
             1:
              (File_Sys_ID,
               Sectors_Per_Cluster,
               Total_Clusters,
               Free_Clusters: cardinal;
               Bytes_Per_Sector: word);
             2:                           {For date/time description,
                                           see file searching realted
                                           routines.}
              (Label_Date,                {Date when volume label was created.}
               Label_Time: word;          {Time when volume label was created.}
               VolumeLabel: ShortString); {Volume label. Can also be used
                                           as ASCIIZ, because the byte
                                           following the last character of
                                           the string is always zero.}
           end;
 PFSInfo = ^TFSInfo;

 TCountryCode=record
               Country,            {Country to query info about (0=current).}
               CodePage: cardinal; {Code page to query info about (0=current).}
              end;
 PCountryCode=^TCountryCode;

 TTimeFmt = (Clock12, Clock24);

 TCountryInfo=record
               Country, CodePage: cardinal;  {Country and codepage requested.}
               case byte of
                0:
                 (DateFormat: cardinal;     {1=ddmmyy 2=yymmdd 3=mmddyy}
                  CurrencyUnit: array [0..4] of char;
                  ThousandSeparator: char;  {Thousands separator.}
                  Zero1: byte;              {Always zero.}
                  DecimalSeparator: char;   {Decimals separator,}
                  Zero2: byte;
                  DateSeparator: char;      {Date separator.}
                  Zero3: byte;
                  TimeSeparator: char;      {Time separator.}
                  Zero4: byte;
                  CurrencyFormat,           {Bit field:
                                             Bit 0: 0=indicator before value
                                                    1=indicator after value
                                             Bit 1: 1=insert space after
                                                      indicator.
                                             Bit 2: 1=Ignore bit 0&1, replace
                                                      decimal separator with
                                                      indicator.}
                  DecimalPlace: byte;       {Number of decimal places used in
                                             currency indication.}
                  TimeFormat: TTimeFmt;     {12/24 hour.}
                  Reserve1: array [0..1] of word;
                  DataSeparator: char;      {Data list separator}
                  Zero5: byte;
                  Reserve2: array [0..4] of word);
                1:
                 (fsDateFmt: cardinal;      {1=ddmmyy 2=yymmdd 3=mmddyy}
                  szCurrency: array [0..4] of char;
                                            {null terminated currency symbol}
                  szThousandsSeparator: array [0..1] of char;
                                            {Thousands separator + #0}
                  szDecimal: array [0..1] of char;
                                            {Decimals separator + #0}
                  szDateSeparator: array [0..1] of char;
                                            {Date separator + #0}
                  szTimeSeparator: array [0..1] of char;
                                            {Time separator + #0}
                  fsCurrencyFmt,            {Bit field:
                                             Bit 0: 0=indicator before value
                                                    1=indicator after value
                                             Bit 1: 1=insert space after
                                                      indicator.
                                             Bit 2: 1=Ignore bit 0&1, replace
                                                      decimal separator with
                                                      indicator}
                  cDecimalPlace: byte;      {Number of decimal places used in
                                             currency indication}
                  fsTimeFmt: byte;          {0=12,1=24 hours}
                  abReserved1: array [0..1] of word;
                  szDataSeparator: array [0..1] of char;
                                            {Data list separator + #0}
                  abReserved2: array [0..4] of word);
              end;
 PCountryInfo=^TCountryInfo;

 TRequestData=record
               PID,                {ID of process that wrote element.}
               Data: cardinal;     {Information from process writing the data.}
              end;
 PRequestData=^TRequestData;

{Queue data structure for synchronously started sessions.}
 TChildInfo = record
  case boolean of
   false:
    (SessionID,
     Return: word);  {Return code from the child process.}
   true:
    (usSessionID,
     usReturn: word);     {Return code from the child process.}
 end;
 PChildInfo = ^TChildInfo;

 TStartData=record
  {Note: to omit some fields, use a length smaller than SizeOf(TStartData).}
  Length:word;                {Length, in bytes, of datastructure
                               (24/30/32/50/60).}
  Related:word;               {Independent/child session (0/1).}
  FgBg:word;                  {Foreground/background (0/1).}
  TraceOpt:word;              {No trace/trace this/trace all (0/1/2).}
  PgmTitle:PChar;             {Program title.}
  PgmName:PChar;              {Filename to program.}
  PgmInputs:PChar;            {Command parameters (nil allowed).}
  TermQ:PChar;                {System queue. (nil allowed).}
  Environment:PChar;          {Environment to pass (nil allowed).}
  InheritOpt:word;            {Inherit enviroment from shell/
                               inherit environment from parent (0/1).}
  SessionType:word;           {Auto/full screen/window/presentation
                               manager/full screen Dos/windowed Dos
                               (0/1/2/3/4/5/6/7).}
  Iconfile:PChar;             {Icon file to use (nil allowed).}
  PgmHandle:cardinal;         {0 or the program handle.}
  PgmControl:word;            {Bitfield describing initial state
                               of windowed sessions.}
  InitXPos,InitYPos:word;     {Initial top coordinates.}
  InitXSize,InitYSize:word;   {Initial size.}
  Reserved:word;
  ObjectBuffer:PChar;         {If a module cannot be loaded, its
                               name will be returned here.}
  ObjectBuffLen:cardinal;     {Size of your buffer.}
 end;
 PStartData=^TStartData;

 TResultCodes=record
  TerminateReason,        {0 = Normal termionation.
                           1 = Critical error.
                           2 = Trapped. (GPE, etc.)
                           3 = Killed by DosKillProcess.}
  ExitCode:cardinal;      {Exit code of child.}
 end;

const
 ilStandard      = 1;
 ilQueryEAsize   = 2;
 ilQueryEAs      = 3;
 ilQueryFullName = 5;

 quFIFO     = 0;
 quLIFO     = 1;
 quPriority = 2;

 quNoConvert_Address = 0;
 quConvert_Address   = 4;

{Start the new session independent or as a child.}
 ssf_Related_Independent = 0;    {Start new session independent
                                  of the calling session.}
 ssf_Related_Child       = 1;    {Start new session as a child
                                  session to the calling session.}

{Start the new session in the foreground or in the background.}
 ssf_FgBg_Fore           = 0;    {Start new session in foreground.}
 ssf_FgBg_Back           = 1;    {Start new session in background.}

{Should the program started in the new session
 be executed under conditions for tracing?}
 ssf_TraceOpt_None       = 0;    {No trace.}
 ssf_TraceOpt_Trace      = 1;    {Trace with no notification
                                  of descendants.}
 ssf_TraceOpt_TraceAll   = 2;    {Trace all descendant sessions.
                                  A termination queue must be
                                  supplied and Related must be
                                  ssf_Related_Child (=1).}

{Will the new session inherit open file handles
 and environment from the calling process.}
 ssf_InhertOpt_Shell     = 0;    {Inherit from the shell.}
 ssf_InhertOpt_Parent    = 1;    {Inherit from the calling process.}

{Specifies the type of session to start.}
 ssf_Type_Default        = 0;    {Use program's type.}
 ssf_Type_FullScreen     = 1;    {OS/2 full screen.}
 ssf_Type_WindowableVIO  = 2;    {OS/2 window.}
 ssf_Type_PM             = 3;    {Presentation Manager.}
 ssf_Type_VDM            = 4;    {DOS full screen.}
 ssf_Type_WindowedVDM    = 7;    {DOS window.}
{Additional values for Windows programs}
 Prog_31_StdSeamlessVDM    = 15; {Windows 3.1 program in its
                                  own windowed session.}
 Prog_31_StdSeamlessCommon = 16; {Windows 3.1 program in a
                                  common windowed session.}
 Prog_31_EnhSeamlessVDM    = 17; {Windows 3.1 program in enhanced
                                  compatibility mode in its own
                                  windowed session.}
 Prog_31_EnhSeamlessCommon = 18; {Windows 3.1 program in enhanced
                                  compatibility mode in a common
                                  windowed session.}
 Prog_31_Enh               = 19; {Windows 3.1 program in enhanced
                                  compatibility mode in a full
                                  screen session.}
 Prog_31_Std               = 20; {Windows 3.1 program in a full
                                  screen session.}

{Specifies the initial attributes for a OS/2 window or DOS window session.}
 ssf_Control_Visible      = 0;   {Window is visible.}
 ssf_Control_Invisible    = 1;   {Window is invisible.}
 ssf_Control_Maximize     = 2;   {Window is maximized.}
 ssf_Control_Minimize     = 4;   {Window is minimized.}
 ssf_Control_NoAutoClose  = 8;   {Window will not close after
                                  the program has ended.}
 ssf_Control_SetPos   = 32768;   {Use InitXPos, InitYPos,
                                  InitXSize, and InitYSize for
                                  the size and placement.}


function DosSetFileInfo (Handle: THandle; InfoLevel: cardinal; AFileStatus: PFileStatus;
        FileStatusLen: cardinal): cardinal; cdecl; external 'DOSCALLS' index 218;

function DosQueryFSInfo (DiskNum, InfoLevel: cardinal; var Buffer: TFSInfo;
               BufLen: cardinal): cardinal; cdecl; external 'DOSCALLS' index 278;

function DosQueryFileInfo (Handle: THandle; InfoLevel: cardinal;
           AFileStatus: PFileStatus; FileStatusLen: cardinal): cardinal; cdecl;
                                                 external 'DOSCALLS' index 279;

function DosScanEnv (Name: PChar; var Value: PChar): cardinal; cdecl;
                                                 external 'DOSCALLS' index 227;

function DosFindFirst (FileMask: PChar; var Handle: THandle; Attrib: cardinal;
                       AFileStatus: PFileStatus; FileStatusLen: cardinal;
                    var Count: cardinal; InfoLevel: cardinal): cardinal; cdecl;
                                                 external 'DOSCALLS' index 264;

function DosFindNext (Handle: THandle; AFileStatus: PFileStatus;
                FileStatusLen: cardinal; var Count: cardinal): cardinal; cdecl;
                                                 external 'DOSCALLS' index 265;

function DosFindClose (Handle: THandle): cardinal; cdecl;
                                                 external 'DOSCALLS' index 263;

function DosQueryCtryInfo (Size: cardinal; var Country: TCountryCode;
           var Res: TCountryInfo; var ActualSize: cardinal): cardinal; cdecl;
                                                        external 'NLS' index 5;

function DosMapCase (Size: cardinal; var Country: TCountryCode;
                      AString: PChar): cardinal; cdecl; external 'NLS' index 7;

function DosDelete(FileName:PChar): cardinal; cdecl;
    external 'DOSCALLS' index 259;

function DosMove(OldFile, NewFile:PChar): cardinal; cdecl;
    external 'DOSCALLS' index 271;

function DosQueryPathInfo(FileName:PChar;InfoLevel:cardinal;
              AFileStatus:PFileStatus;FileStatusLen:cardinal): cardinal; cdecl;
    external 'DOSCALLS' index 223;

function DosSetPathInfo(FileName:PChar;InfoLevel:cardinal;
                        AFileStatus:PFileStatus;FileStatusLen,
                        Options:cardinal):cardinal; cdecl;
    external 'DOSCALLS' index 219;

function DosOpen(FileName:PChar;var Handle: THandle; var Action: cardinal;
                 InitSize,Attrib,OpenFlags,FileMode:cardinal;
                 EA:Pointer):cardinal; cdecl;
    external 'DOSCALLS' index 273;

function DosClose(Handle: THandle): cardinal; cdecl;
    external 'DOSCALLS' index 257;

function DosRead(Handle:THandle; var Buffer; Count: cardinal;
                                      var ActCount: cardinal): cardinal; cdecl;
    external 'DOSCALLS' index 281;

function DosWrite(Handle: THandle; Buffer: pointer; Count: cardinal;
                                      var ActCount: cardinal): cardinal; cdecl;
    external 'DOSCALLS' index 282;

function DosSetFilePtr(Handle: THandle; Pos: longint; Method: cardinal;
                                     var PosActual: cardinal): cardinal; cdecl;
    external 'DOSCALLS' index 256;

function DosSetFileSize (Handle: THandle; Size: cardinal): cardinal; cdecl;
    external 'DOSCALLS' index 272;

procedure DosSleep (MSec: cardinal); cdecl; external 'DOSCALLS' index 229;

function DosCreateQueue (var Handle: THandle; Priority:longint;
                        Name: PChar): cardinal; cdecl;
                                                  external 'QUECALLS' index 16;

function DosReadQueue (Handle: THandle; var ReqBuffer: TRequestData;
                      var DataLen: cardinal; var DataPtr: pointer;
                      Element, Wait: cardinal; var Priority: byte;
                      ASem: THandle): cardinal; cdecl;
                                                   external 'QUECALLS' index 9;

function DosCloseQueue (Handle: THandle): cardinal; cdecl;
                                                  external 'QUECALLS' index 11;

function DosStartSession (var AStartData: TStartData;
                          var SesID, PID: cardinal): cardinal; cdecl;
                                                    external 'SESMGR' index 37;

function DosFreeMem(P:pointer):cardinal; cdecl; external 'DOSCALLS' index 304;

function DosExecPgm (ObjName: PChar; ObjLen: longint; ExecFlag: cardinal;
                     Args, Env: PByteArray; var Res: TResultCodes;
                     FileName:PChar): cardinal; cdecl;
                                                 external 'DOSCALLS' index 283;

type
  TDT=packed record
    Hour,
    Minute,
    Second,
    Sec100,
    Day,
    Month: byte;
    Year: word;
    TimeZone: smallint;
    WeekDay: byte;
  end;

function DosGetDateTime(var Buf: TDT): cardinal; cdecl;
    external 'DOSCALLS' index 230;


{****************************************************************************
                              File Functions
****************************************************************************}

const
 ofRead        = $0000;     {Open for reading}
 ofWrite       = $0001;     {Open for writing}
 ofReadWrite   = $0002;     {Open for reading/writing}
 doDenyRW      = $0010;     {DenyAll (no sharing)}
 faCreateNew   = $00010000; {Create if file does not exist}
 faOpenReplace = $00040000; {Truncate if file exists}
 faCreate      = $00050000; {Create if file does not exist, truncate otherwise}

 FindResvdMask = $00003737; {Allowed bits in attribute
                             specification for DosFindFirst call.}

function FileOpen (const FileName: string; Mode: integer): longint;
Var
  Handle: THandle;
  Rc, Action: cardinal;
begin
(* DenyNone if sharing not specified. *)
  if Mode and 112 = 0 then Mode:=Mode or 64;
  Rc:=DosOpen(PChar (FileName), Handle, Action, 0, 0, 1, Mode, nil);
  If Rc=0 then
    FileOpen:=Handle
  else
    FileOpen:=-RC;
end;

function FileCreate (const FileName: string): longint;
Const
  Mode = ofReadWrite or faCreate or doDenyRW;   (* Sharing to DenyAll *)
Var
  Handle: THandle;
  RC, Action: cardinal;
Begin
  RC:=DosOpen(PChar (FileName), Handle, Action, 0, 0, $12, Mode, Nil);
  If RC=0 then
    FileCreate:=Handle
  else
    FileCreate:=-RC;
End;

function FileCreate (const FileName: string; Mode: integer): longint;
begin
 FileCreate := FileCreate(FileName);
end;


function FileRead (Handle: longint; var Buffer; Count: longint): longint;
Var
  T: cardinal;
begin
  DosRead(Handle, Buffer, Count, T);
  FileRead := longint (T);
end;

function FileWrite (Handle: longint; const Buffer; Count: longint): longint;
Var
  T: cardinal;
begin
  DosWrite (Handle, @Buffer, Count, T);
  FileWrite := longint (T);
end;

function FileSeek (Handle, FOffset, Origin: longint): longint;
var
  npos: cardinal;
begin
  if DosSetFilePtr (Handle, FOffset, Origin, npos) = 0 Then
    FileSeek:= longint (npos)
  else
    FileSeek:=-1;
end;

function FileSeek (Handle: longint; FOffset, Origin: Int64): Int64;
begin
  {$warning need to add 64bit call }
  Result:=FileSeek(Handle,Longint(Foffset),Longint(Origin));
end;

procedure FileClose (Handle: longint);
begin
  DosClose(Handle);
end;

function FileTruncate (Handle, Size: longint): boolean;
begin
  FileTruncate:=DosSetFileSize(Handle, Size)=0;
  FileSeek(Handle, 0, 2);
end;

function FileAge (const FileName: string): longint;
var Handle: longint;
begin
    Handle := FileOpen (FileName, 0);
    if Handle <> -1 then
        begin
            Result := FileGetDate (Handle);
            FileClose (Handle);
        end
    else
        Result := -1;
end;


function FileExists (const FileName: string): boolean;
var
  SR: TSearchRec;
  RC: longint;
begin
  FileExists:=False;
  if FindFirst (FileName, faAnyFile and not (faDirectory), SR) = 0
    then FileExists := True;
  FindClose(SR);
end;

type    TRec = record
            T, D: word;
        end;
        PSearchRec = ^SearchRec;

function FindFirst (const Path: string; Attr: longint; out Rslt: TSearchRec): longint;

var SR: PSearchRec;
    FStat: PFileFindBuf3;
    Count: cardinal;
    Err: cardinal;
    I: cardinal;

begin
  New (FStat);
  Rslt.FindHandle := THandle ($FFFFFFFF);
  Count := 1;
  Err := DosFindFirst (PChar (Path), Rslt.FindHandle,
            Attr and FindResvdMask, FStat, SizeOf (FStat^), Count, ilStandard);
  if (Err = 0) and (Count = 0) then Err := 18;
  FindFirst := -Err;
  if Err = 0 then
  begin
    Rslt.Name := FStat^.Name;
    Rslt.Size := FStat^.FileSize;
    Rslt.Attr := FStat^.AttrFile;
    Rslt.ExcludeAttr := 0;
    TRec (Rslt.Time).T := FStat^.TimeLastWrite;
    TRec (Rslt.Time).D := FStat^.DateLastWrite;
  end;
  Dispose (FStat);
end;


function FindNext (var Rslt: TSearchRec): longint;
var
  SR: PSearchRec;
  FStat: PFileFindBuf3;
  Count: cardinal;
  Err: cardinal;
begin
  New (FStat);
  Count := 1;
  Err := DosFindNext (Rslt.FindHandle, FStat, SizeOf (FStat^),
                                                              Count);
  if (Err = 0) and (Count = 0) then Err := 18;
  FindNext := -Err;
  if Err = 0 then
  begin
    Rslt.Name := FStat^.Name;
    Rslt.Size := FStat^.FileSize;
    Rslt.Attr := FStat^.AttrFile;
    Rslt.ExcludeAttr := 0;
    TRec (Rslt.Time).T := FStat^.TimeLastWrite;
    TRec (Rslt.Time).D := FStat^.DateLastWrite;
  end;
  Dispose (FStat);
end;


procedure FindClose (var F: TSearchrec);
var
  SR: PSearchRec;
begin
  DosFindClose (F.FindHandle);
  F.FindHandle := 0;
end;

function FileGetDate (Handle: longint): longint;
var
  FStat: TFileStatus3;
  Time: Longint;
begin
  DosError := DosQueryFileInfo(Handle, ilStandard, @FStat, SizeOf(FStat));
  if DosError=0 then
  begin
    Time := FStat.TimeLastWrite + longint (FStat.DateLastWrite) shl 16;
    if Time = 0 then
      Time := FStat.TimeCreation + longint (FStat.DateCreation) shl 16;
  end else
    Time:=0;
  FileGetDate:=Time;
end;

function FileSetDate (Handle, Age: longint): longint;
var
  FStat: PFileStatus3;
  RC: cardinal;
begin
  New (FStat);
  RC := DosQueryFileInfo (Handle, ilStandard, FStat, SizeOf (FStat^));
  if RC <> 0 then
    FileSetDate := -1
  else
  begin
    FStat^.DateLastAccess := Hi (Age);
    FStat^.DateLastWrite := Hi (Age);
    FStat^.TimeLastAccess := Lo (Age);
    FStat^.TimeLastWrite := Lo (Age);
    RC := DosSetFileInfo (Handle, ilStandard, FStat, SizeOf (FStat^));
    if RC <> 0 then
      FileSetDate := -1
    else
      FileSetDate := 0;
  end;
  Dispose (FStat);
end;

function FileGetAttr (const FileName: string): longint;
var
  FS: PFileStatus3;
begin
  New(FS);
  Result:=-DosQueryPathInfo(PChar (FileName), ilStandard, FS, SizeOf(FS^));
  If Result=0 Then Result:=FS^.attrFile;
  Dispose(FS);
end;

function FileSetAttr (const Filename: string; Attr: longint): longint;
Var
  FS: PFileStatus3;
Begin
  New(FS);
  FillChar(FS, SizeOf(FS^), 0);
  FS^.AttrFile:=Attr;
  Result:=-DosSetPathInfo(PChar (FileName), ilStandard, FS, SizeOf(FS^), 0);
  Dispose(FS);
end;


function DeleteFile (const FileName: string): boolean;
Begin
  Result:=(DosDelete(PChar (FileName))=0);
End;

function RenameFile (const OldName, NewName: string): boolean;
Begin
  Result:=(DosMove(PChar (OldName), PChar (NewName))=0);
End;

{****************************************************************************
                              Disk Functions
****************************************************************************}

function DiskFree (Drive: byte): int64;

var FI: TFSinfo;
    RC: cardinal;

begin
        {In OS/2, we use the filesystem information.}
            RC := DosQueryFSInfo (Drive, 1, FI, SizeOf (FI));
            if RC = 0 then
                DiskFree := int64 (FI.Free_Clusters) *
                   int64 (FI.Sectors_Per_Cluster) * int64 (FI.Bytes_Per_Sector)
            else
                DiskFree := -1;
end;

function DiskSize (Drive: byte): int64;

var FI: TFSinfo;
    RC: cardinal;

begin
        {In OS/2, we use the filesystem information.}
            RC := DosQueryFSinfo (Drive, 1, FI, SizeOf (FI));
            if RC = 0 then
                DiskSize := int64 (FI.Total_Clusters) *
                   int64 (FI.Sectors_Per_Cluster) * int64 (FI.Bytes_Per_Sector)
            else
                DiskSize := -1;
end;


function GetCurrentDir: string;
begin
 GetDir (0, Result);
end;


function SetCurrentDir (const NewDir: string): boolean;
begin
{$I-}
{$WARNING Should be rewritten to avoid unit dos dependancy!}
 ChDir (NewDir);
 Result := (IOResult = 0);
{$I+}
end;


function CreateDir (const NewDir: string): boolean;
begin
{$I-}
{$WARNING Should be rewritten to avoid unit dos dependancy!}
 MkDir (NewDir);
 Result := (IOResult = 0);
{$I+}
end;


function RemoveDir (const Dir: string): boolean;
begin
{$I-}
{$WARNING Should be rewritten to avoid unit dos dependancy!}
 RmDir (Dir);
 Result := (IOResult = 0);
 {$I+}
end;


function DirectoryExists (const Directory: string): boolean;
var
  SR: TSearchRec;
begin
  DirectoryExists := (FindFirst (Directory, faAnyFile, SR) = 0) and
                                                (SR.Attr and faDirectory <> 0);
  FindClose(SR);
end;

{****************************************************************************
                              Time Functions
****************************************************************************}

procedure GetLocalTime (var SystemTime: TSystemTime);
var
  DT: TDT;
begin
  DosGetDateTime(DT);
  with SystemTime do
  begin
    Year:=DT.Year;
    Month:=DT.Month;
    Day:=DT.Day;
    Hour:=DT.Hour;
    Minute:=DT.Minute;
    Second:=DT.Second;
    MilliSecond:=DT.Sec100;
  end;
end;

{****************************************************************************
                              Misc Functions
****************************************************************************}

procedure Beep;
begin
end;


{****************************************************************************
                              Locale Functions
****************************************************************************}

procedure InitAnsi;
var I: byte;
    Country: TCountryCode;
begin
    for I := 0 to 255 do
        UpperCaseTable [I] := Chr (I);
    Move (UpperCaseTable, LowerCaseTable, SizeOf (UpperCaseTable));
            FillChar (Country, SizeOf (Country), 0);
            DosMapCase (SizeOf (UpperCaseTable), Country, @UpperCaseTable);
    for I := 0 to 255 do
        if UpperCaseTable [I] <> Chr (I) then
            LowerCaseTable [Ord (UpperCaseTable [I])] := Chr (I);
end;


procedure InitInternational;
var Country: TCountryCode;
    CtryInfo: TCountryInfo;
    Size: cardinal;
    RC: cardinal;
begin
    Size := 0;
    FillChar (Country, SizeOf (Country), 0);
    FillChar (CtryInfo, SizeOf (CtryInfo), 0);
    RC := DosQueryCtryInfo (SizeOf (CtryInfo), Country, CtryInfo, Size);
    if RC = 0 then
        begin
            DateSeparator := CtryInfo.DateSeparator;
            case CtryInfo.DateFormat of
             1: begin
                    ShortDateFormat := 'd/m/y';
                    LongDateFormat := 'dd" "mmmm" "yyyy';
                end;
             2: begin
                    ShortDateFormat := 'y/m/d';
                    LongDateFormat := 'yyyy" "mmmm" "dd';
                end;
             3: begin
                    ShortDateFormat := 'm/d/y';
                    LongDateFormat := 'mmmm" "dd" "yyyy';
                end;
            end;
            TimeSeparator := CtryInfo.TimeSeparator;
            DecimalSeparator := CtryInfo.DecimalSeparator;
            ThousandSeparator := CtryInfo.ThousandSeparator;
            CurrencyFormat := CtryInfo.CurrencyFormat;
            CurrencyString := PChar (CtryInfo.CurrencyUnit);
        end;
    InitAnsi;
    InitInternationalGeneric;
end;

function SysErrorMessage(ErrorCode: Integer): String;

begin
  Result:=Format(SUnknownErrorCode,[ErrorCode]);
end;


{****************************************************************************
                              OS Utils
****************************************************************************}

Function GetEnvironmentVariable(Const EnvVar : String) : String;

begin
    GetEnvironmentVariable := StrPas (GetEnvPChar (EnvVar));
end;


Function GetEnvironmentVariableCount : Integer;

begin
(*  Result:=FPCCountEnvVar(EnvP); - the amount is already known... *)
  GetEnvironmentVariableCount := EnvC;
end;


Function GetEnvironmentString(Index : Integer) : String;

begin
  Result:=FPCGetEnvStrFromP (EnvP, Index);
end;


procedure Sleep (Milliseconds: cardinal);

begin
 DosSleep (Milliseconds);
end;


function ExecuteProcess (const Path: AnsiString; const ComLine: AnsiString):
                                                                       integer;
var
 HQ: THandle;
 SPID, STID, QName: shortstring;
 SD: TStartData;
 SID, PID: cardinal;
 RD: TRequestData;
 PCI: PChildInfo;
 CISize: cardinal;
 Prio: byte;
 E: EOSError;
 CommandLine: ansistring;
 Args0, Args: PByteArray;
 ObjNameBuf: PChar;
 ArgSize: word;
 Res: TResultCodes;
 ObjName: shortstring;

const
 MaxArgsSize = 3072; (* Amount of memory reserved for arguments in bytes. *)
 ObjBufSize = 512;

begin
 ObjName := '';
 GetMem (ObjNameBuf, ObjBufSize);
 FillChar (ObjNameBuf^, ObjBufSize, 0);
 if ComLine = '' then
  begin
   Args0 := nil;
   Args := nil;
  end
 else
  begin
   GetMem (Args0, MaxArgsSize);
   Args := Args0;
(* Work around a bug in OS/2 - argument to DosExecPgm *)
(* should not cross 64K boundary. *)
   if ((PtrUInt (Args) + 1024) and $FFFF) < 1024 then
    Inc (Args, 1024);
   ArgSize := 0;
   Move (Path [1], Args^ [ArgSize], Length (Path));
   Inc (ArgSize, Length (Path));
   Args^ [ArgSize] := 0;
   Inc (ArgSize);
   {Now do the real arguments.}
   Move (ComLine [1], Args^ [ArgSize], Length (ComLine));
   Inc (ArgSize, Length (ComLine));
   Args^ [ArgSize] := 0;
   Inc (ArgSize);
   Args^ [ArgSize] := 0;
  end;
 Result := DosExecPgm (ObjNameBuf, ObjBufSize, 0, Args, nil, Res, PChar (Path));
 if Args0 <> nil then
  FreeMem (Args0, MaxArgsSize);
 if Result = 0 then
  begin
   Result := Res.ExitCode;
   FreeMem (ObjNameBuf, ObjBufSize);
  end
 else
  begin
   if (Result = 190) or (Result = 191) then
    begin
     FillChar (SD, SizeOf (SD), 0);
     SD.Length := 24;
     SD.Related := ssf_Related_Child;
     CommandLine := FExpand (Path);    (* Needed for other session types... *)
     SD.PgmName := PChar (CommandLine);
     if ComLine <> '' then
      SD.PgmInputs := PChar (ComLine);
     SD.InheritOpt := ssf_InhertOpt_Parent;
     Str (GetProcessID, SPID);
     Str (ThreadID, STID);
     QName := '\QUEUES\FPC_ExecuteProcess_p' + SPID + 't' + STID + '.QUE'#0;
     SD.TermQ := @QName [1];
     Result := DosCreateQueue (HQ, quFIFO or quConvert_Address, @QName [1]);
     if Result = 0 then
      begin
       Result := DosStartSession (SD, SID, PID);
       if (Result = 0) or (Result = 457) then
        begin
         Result := DosReadQueue (HQ, RD, CISize, PCI, 0, 0, Prio, 0);
         if Result = 0 then
          begin
           Result := PCI^.Return;
           DosCloseQueue (HQ);
           DosFreeMem (PCI);
           Exit;
          end;
        end;
       DosCloseQueue (HQ);
      end;
    end
   else
    ObjName := StrPas (ObjNameBuf);
   FreeMem (ObjNameBuf, ObjBufSize);
   if ComLine = '' then
    CommandLine := Path
   else
    CommandLine := Path + ' ' + ComLine;
   if ObjName = '' then
    E := EOSError.CreateFmt (SExecuteProcessFailed, [CommandLine, Result])
   else
    E := EOSError.CreateFmt (SExecuteProcessFailed + '(' + ObjName + ')', [CommandLine, Result]);
   E.ErrorCode := Result;
   raise E;
  end;
end;


function ExecuteProcess (const Path: AnsiString;
                                  const ComLine: array of AnsiString): integer;

var
  CommandLine: AnsiString;
  I: integer;

begin
  Commandline := '';
  for I := 0 to High (ComLine) do
   if Pos (' ', ComLine [I]) <> 0 then
    CommandLine := CommandLine + ' ' + '"' + ComLine [I] + '"'
   else
    CommandLine := CommandLine + ' ' + Comline [I];
  ExecuteProcess := ExecuteProcess (Path, CommandLine);
end;



{****************************************************************************
                              Initialization code
****************************************************************************}

Initialization
  InitExceptions;       { Initialize exceptions. OS independent }
  InitInternational;    { Initialize internationalization settings }
Finalization
  DoneExceptions;
end.