freepascal.compiler/rtl/inc/iso7185.pp

{
    This file is part of the Free Pascal Run time library.
    Copyright (c) 2010 by Florian Klaempfl

    This unit contain procedures specific for iso pascal mode.
    It should be platform independant.

    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 iso7185;

  interface

    const
       MaxInt  = MaxLongint;

    type
      Integer = Longint;

    Procedure Rewrite(var t : Text);
    Procedure Reset(var t : Text);
    Procedure Reset(var f : TypedFile);   [INTERNPROC: fpc_in_Reset_TypedFile];
    Procedure Rewrite(var f : TypedFile); [INTERNPROC: fpc_in_Rewrite_TypedFile];

    Procedure Rewrite(var t : Text;const filename : string);
    Procedure Reset(var t : Text;const filename : string);
    Procedure Reset(var f : TypedFile;const filename : string);   [INTERNPROC: fpc_in_Reset_TypedFile_Name];
    Procedure Rewrite(var f : TypedFile;const filename : string); [INTERNPROC: fpc_in_Rewrite_TypedFile_Name];

    Function Eof(Var t: Text): Boolean;
    Function Eof:Boolean;
    Function Eoln(Var t: Text): Boolean;
    Function Eoln:Boolean;

    Procedure Page;
    Procedure Page(Var t: Text);

    Procedure Get(Var t: Text);
    Procedure Put(Var t: Text);

    Procedure Get(Var f: TypedFile);
    Procedure Put(Var f: TypedFile);

    Function Eof(var f:TypedFile): Boolean;

  implementation

{$IFDEF UNIX}
  function getTempDir: string;
    var
      key: string;
      value: string;
      i_env, i_key, i_value: integer;
      pd : char; // Pathdelim not available ?
    begin
      value := '/tmp/';  (** default for UNIX **)
      pd:='/';
      while (envp <> NIL) and assigned(envp^) do
      begin
        i_env := 0;
        i_key := 1;
        while not (envp^[i_env] in ['=', #0]) do
        begin
          key[i_key] := envp^[i_env];
          inc(i_env);
          inc(i_key);
        end;
        setlength(key, i_key - 1);
        if (key = 'TEMP') or (key = 'TMP') or (key = 'TMPDIR') then
        begin
          inc(i_env);    (** skip '=' **)
          i_value := 1;
          while (envp^[i_env] <> #0) do
          begin
            value[i_value] := envp^[i_env];
            inc(i_env);
            inc(i_value);
          end;
          setlength(value, i_value - 1);
        end;
        inc(envp);
      end;
      i_value:=length(value);
      if (i_value>0) and (value[i_value]<>pd) then
       value:=value+pd;
      getTempDir := value;
    end;
{$else}    
  function getTempDir: string;
  begin
    getTempDir:='';
  end;
{$ENDIF}  

{$i-}
    procedure DoAssign(var t : Text);
{$ifndef FPC_HAS_FEATURE_RANDOM}
      const
        NextIndex : Word = 1;
{$endif FPC_HAS_FEATURE_RANDOM}
      begin
{$ifdef FPC_HAS_FEATURE_RANDOM}
        Assign(t,getTempDir+'fpc_'+HexStr(random(1000000000),8)+'.tmp');
{$else FPC_HAS_FEATURE_RANDOM}
        Assign(t,getTempDir+'fpc_'+HexStr(NextIndex,4)+'.tmp');
        Inc(NextIndex);
{$endif FPC_HAS_FEATURE_RANDOM}
      end;


    Procedure Rewrite(var t : Text);[IOCheck];
      Begin
        { create file name? }
        if Textrec(t).mode=0 then
          DoAssign(t);

        System.Rewrite(t);
      End;


    Procedure Reset(var t : Text);[IOCheck];
      Begin
        case Textrec(t).mode of
          { create file name? }
          0:
            DoAssign(t);
          fmOutput:
            Write(t,#26);
        end;

        System.Reset(t);
      End;


    Procedure Rewrite(var t : Text;const filename : string);[IOCheck];
      Begin
        { create file name? }
        if Textrec(t).mode=0 then
          Assign(t,filename);

        System.Rewrite(t);
      End;


    Procedure Reset(var t : Text;const filename : string);[IOCheck];
      Begin
        case Textrec(t).mode of
          { create file name? }
          0:
            Assign(t,filename);
          fmOutput:
            Write(t,#26);
        end;

        System.Reset(t);
      End;


    Function Eof(Var t: Text): Boolean;[IOCheck];
      var
        OldCtrlZMarksEof : Boolean;
      Begin
        { not sure if this is correct, but we are always at eof when
          writing to a file }
        if TextRec(t).mode=fmOutput then
          Eof:=true
        else
          begin
            OldCtrlZMarksEof:=CtrlZMarksEOF;
            CtrlZMarksEof:=false;
            Eof:=System.Eof(t);
            CtrlZMarksEof:=OldCtrlZMarksEOF;
          end;
      end;


    Function Eof:Boolean;
      Begin
        Eof:=Eof(Input);
      End;


    Function Eoln(Var t: Text): Boolean;[IOCheck];
      var
        OldCtrlZMarksEof : Boolean;
      Begin
        OldCtrlZMarksEof:=CtrlZMarksEOF;
        CtrlZMarksEof:=true;
        Eoln:=System.Eoln(t);
        CtrlZMarksEof:=OldCtrlZMarksEOF;
      end;


    Function Eoln:Boolean;
      Begin
        Eoln:=Eoln(Input);
      End;


    Procedure Page;[IOCheck];
      begin
        Page(Output);
      end;


    Procedure Page(var t : Text);[IOCheck];
      Begin
        write(#12);
      End;


    procedure Get(var t : Text);[IOCheck];
      var
        c : char;
      Begin
        Read(t,c);
      End;


    Procedure Put(var t : Text);[IOCheck];
      type
        FileFunc = Procedure(var t : TextRec);
      begin
        inc(TextRec(t).BufPos);
        If TextRec(t).BufPos>=TextRec(t).BufSize Then
          FileFunc(TextRec(t).InOutFunc)(TextRec(t));
      end;


    procedure Get(var f:TypedFile);[IOCheck];
      Begin
        if not(eof(f)) then
          BlockRead(f,(pbyte(@f)+sizeof(FileRec))^,1)
      End;


    Procedure Put(var f:TypedFile);[IOCheck];
      begin
        BlockWrite(f,(pbyte(@f)+sizeof(FileRec))^,1)
      end;


    Function Eof(var f:TypedFile): Boolean;[IOCheck];
      Type
        UnTypedFile = File;
      Begin
        Eof:=System.Eof(UnTypedFile(f));
      End;

begin
  { we shouldn't do this because it might confuse user programs, but for now it
    is good enough to get pretty unique tmp file names }
{$ifdef FPC_HAS_FEATURE_RANDOM}
  Randomize;
{$endif FPC_HAS_FEATURE_RANDOM}
  { reset opens with read-only }
  Filemode:=0;
end.