{
    $Id$
    This file is part of the Free Pascal run time library.
    Copyright (c) 1998 by Florian Klaempfl
    member of the Free Pascal development team

    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
    {$ifdef linux}
       linux
    {$endif}
    {$ifdef win32}
       dos,windows
    {$endif}
    {$ifdef go32v1}
       go32,dos
    {$endif}
    {$ifdef go32v2}
       go32,dos
    {$endif}
    {$ifdef os2}
       doscalls
    {$endif}
       ;


type
   { some helpful data types }

   tprocedure = procedure;

   tfilename = string;

   longrec = packed record
      lo,hi : word;
   end;

   wordrec = packed record
      lo,hi : byte;
   end;

   TMethod = packed record
     Code, Data: Pointer;
   end;


   { exceptions }
   exception = class(TObject)
    private
      fmessage : string;
      fhelpcontext : longint;
    public
      constructor create(const msg : string);
      constructor createfmt(const msg : string; const args : array of const);
      constructor createres(ident : longint);
      { !!!! }
      property helpcontext : longint read fhelpcontext write fhelpcontext;
      property message : string read fmessage write fmessage;
   end;

   exceptclass = class of exception;

   { integer math exceptions }
   EInterror    = Class(Exception);
   EDivByZero   = Class(EIntError);
   ERangeError  = Class(EIntError);
   EIntOverflow = Class(EIntError);

   { General math errors }
   EMathError  = Class(Exception);
   EInvalidOp  = Class(EMathError);
   EZeroDivide = Class(EMathError);
   EOverflow   = Class(EMathError);
   EUnderflow  = Class(EMathError);

   { Run-time and I/O Errors }
   EInOutError = class(Exception)
     public
     ErrorCode : Longint;
     end;
   EInvalidPointer  = Class(Exception);
   EOutOfMemory     = Class(Exception);
   EAccessViolation = Class(Exception);
   EInvalidCast = Class(Exception);


   { String conversion errors }
   EConvertError = class(Exception);

   { Other errors }
   EAbort           = Class(Exception);
   EAbstractError   = Class(Exception);
   EAssertionFailed = Class(Exception);

  { FileRec/TextRec }
  {$i filerec.inc}
  {$i textrec.inc}

  { Read internationalization settings }
  {$i sysinth.inc}

  { Read date & Time function declarations }
  {$i datih.inc}

  { Read String Handling functions declaration }
  {$i sysstrh.inc}

  { Read pchar handling functions declration }
  {$i syspchh.inc}

  { Read filename handling functions declaration }
  {$i finah.inc}

  { Read other file handling function declarations }
  {$i filutilh.inc}

  { Read disk function declarations }
  {$i diskh.inc}

  implementation

  { Read message string definitions }
  {
   Add a language with IFDEF LANG_NAME
   just befor the final ELSE. This way English will always be the default.
  }

  {$IFDEF LANG_GERMAN}
  {$i strg.inc} // Does not exist yet !!
  {$ELSE}
  {$i stre.inc}
  {$ENDIF}

  { Read filename handling functions implementation }
  {$i fina.inc}

  { Read String Handling functions implementation }
  {$i sysstr.inc}

  { Read other file handling function implementations }
  {$i filutil.inc}

  { Read disk function implementations }
  {$i disk.inc}

  { Read date & Time function implementations }
  {$i dati.inc}

  { Read pchar handling functions implementation }
  {$i syspch.inc}


    constructor exception.create(const msg : string);

      begin
         inherited create;
         fmessage:=msg;
      end;


    constructor exception.createfmt(const msg : string; const args : array of const);

      begin
         inherited create;
         fmessage:=Format(msg,args);
      end;


    constructor exception.createres(ident : longint);

      begin
         inherited create;
         {!!!!!}
      end;


Procedure CatchUnhandledException (Obj : TObject; Addr: Pointer);
Var
  Message : String;
begin
  Writeln(stdout,'An unhandled exception occurred at 0x',HexStr(Longint(Addr),8),' :');
  if Obj is exception then
   begin
     Message:=Exception(Obj).Message;
     Writeln(stdout,Message);
   end
  else
   Writeln(stdout,'Exception object ',Obj.ClassName,' is not of class Exception.');
  Writeln(stdout,'');
  Halt(217);
end;


Var OutOfMemory : EOutOfMemory;
    InValidPointer : EInvalidPointer;


Procedure RunErrorToExcept (ErrNo : Longint; Address : Pointer);

Var E : Exception;
    S : String;

begin
  Case Errno of
   1,203 : E:=OutOfMemory;
   204 : E:=InvalidPointer;
   2,3,4,5,6,100,101,102,103,105,106 : { I/O errors }
     begin
     Case Errno of
       2 : S:=SFileNotFound;
       3 : S:=SInvalidFileName;
       4 : S:=STooManyOpenFiles;
       5 : S:=SAccessDenied;
       6 : S:=SInvalidFileHandle;
       15 : S:=SInvalidDrive;
       100 : S:=SEndOfFile;
       101 : S:=SDiskFull;
       102 : S:=SFileNotAssigned;
       103 : S:=SFileNotOpen;
       104 : S:=SFileNotOpenForInput;
       105 : S:=SFileNotOpenForOutput;
       106 : S:=SInvalidInput;
     end;
     E:=EinOutError.Create (S);
     EInoutError(E).ErrorCode:=IOresult; // Clears InOutRes !!
     end;
  // We don't set abstracterrorhandler, but we do it here.
  // Unless the use sets another handler we'll get here anyway...
  200 : E:=EDivByZero.Create(SDivByZero);
  201 : E:=ERangeError.Create(SRangeError);
  205 : E:=EOverflow.Create(SOverflow);
  206 : E:=EOverflow.Create(SUnderflow);
  207 : E:=EInvalidOp.Create(SInvalidOp);
  211 : E:=EAbstractError.Create(SAbstractError);
  215 : E:=EIntOverflow.Create(SIntOverflow);
  216 : E:=EAccessViolation.Create(SAccessViolation);
  219 : E:=EInvalidCast.Create(SInvalidCast);
  227 : E:=EAssertionFailed.Create(SAssertionFailed);
  else
   E:=Exception.CreateFmt (SUnKnownRunTimeError,[Errno]);
  end;
  Raise E at longint(Address);
end;


Procedure AssertErrorHandler (Const Msg,FN : ShortString;LineNo,TheAddr : Longint);
Var
  S : String;
begin
  If Msg='' then
    S:=SAssertionFailed
  else
    S:=Msg;
  Raise EAssertionFailed.Createfmt(SAssertError,[S,Fn,LineNo]); // at Pointer(theAddr);
end;


Procedure InitExceptions;
{
  Must install uncaught exception handler (ExceptProc)
  and install exceptions for system exceptions or signals.
  (e.g: SIGSEGV -> ESegFault or so.)
}
begin
  ExceptProc:=@CatchUnhandledException;
  // Create objects that may have problems when there is no memory.
  OutOfMemory:=EOutOfMemory.Create(SOutOfMemory);
  InvalidPointer:=EInvalidPointer.Create(SInvalidPointer);
  AssertErrorProc:=@AssertErrorHandler;
  ErrorProc:=@RunErrorToExcept;
end;


{  Initialization code. }

Initialization
  InitExceptions;       { Initialize exceptions. OS independent }
  InitInternational;    { Initialize internationalization settings }
Finalization
  OutOfMemory.Free;
  InValidPointer.Free;
end.
{
    $Log$
    Revision 1.38  1999-12-26 19:30:53  hajny
      * OS/2 target added to the uses clause

    Revision 1.36  1999/11/15 21:49:47  peter
      * exception address fixes

    Revision 1.35  1999/11/06 14:41:31  peter
      * truncated log

    Revision 1.34  1999/10/30 17:39:05  peter
      * memorymanager expanded with allocmem/reallocmem

    Revision 1.33  1999/10/26 12:29:07  peter
      * assert handler must use shortstring

    Revision 1.32  1999/09/15 20:26:30  florian
      * patch from Sebastian Guenther applied: TMethod implementation

    Revision 1.31  1999/08/28 14:53:27  florian
      * bug 471 fixed: run time error 2 is now converted into a file not
        found exception

    Revision 1.30  1999/08/18 11:28:24  michael
    * Fixed reallocmem bug 535

    Revision 1.29  1999/07/27 13:01:12  peter
      + filerec,textrec declarations

    Revision 1.28  1999/07/08 19:32:36  michael
    + Freed exception classes in finalization code

    Revision 1.27  1999/07/02 17:03:24  florian
      + added some runtime->excpetin wrappers: eintoverflow, eoverflow, eunderflow, einvalidop

    Revision 1.26  1999/04/09 08:40:46  michael
    + Fixed tfiletime problem

    Revision 1.25  1999/04/08 16:26:31  michael
    + Added (re)allocmem

    Revision 1.24  1999/04/08 12:23:05  peter
      * removed os.inc

    Revision 1.23  1999/02/28 13:17:37  michael
    + Added internationalization support and more format functions

    Revision 1.22  1999/02/10 22:15:13  michael
    + Changed to ansistrings

    Revision 1.21  1999/02/09 14:24:50  pierre
     * dos unit missing for go32v2 !!

    Revision 1.20  1999/02/09 12:38:44  michael
    * Fixed INt() proble. Defined THandle, included Filemode constants

    Revision 1.19  1999/02/03 16:18:58  michael
    + Uses Windows on win32 platform

    Revision 1.18  1998/12/15 22:43:12  peter
      * removed temp symbols

    Revision 1.17  1998/10/20 19:26:37  michael
    + Forgot to include disk functions

    Revision 1.16  1998/10/11 12:23:41  michael
    + More sysutils calls.

    Revision 1.15  1998/10/10 09:53:10  michael
    Added assertion handling

}