(* RTfio.def provide default FIO based methods.

Copyright (C) 2008-2023 Free Software Foundation, Inc.
Contributed by Gaius Mulley <gaius.mulley@southwales.ac.uk>.

This file is part of GNU Modula-2.

GNU Modula-2 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 3, or (at your option)
any later version.

GNU Modula-2 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.

Under Section 7 of GPL version 3, you are granted additional
permissions described in the GCC Runtime Library Exception, version
3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and
a copy of the GCC Runtime Library Exception along with this program;
see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
<http://www.gnu.org/licenses/>.  *)

DEFINITION MODULE RTfio ;

(*
    Title      : RTfio
    Author     : Gaius Mulley
    System     : GNU Modula-2
    Date       : Wed Sep 24 11:54:58 2008
    Revision   : $Version$
    Description: provides default FIO based methods for the RTgenif
                 procedures.  These will be used by StreamFile,
                 SeqFile, StdChans, TermFile and RndFile.
*)

FROM SYSTEM IMPORT ADDRESS ;
FROM IOLink IMPORT DeviceTablePtr;
FROM RTgenif IMPORT GenDevIF ;


(*
   doreadchar - returns a CHAR from the file associated with, g.
*)

PROCEDURE doreadchar (g: GenDevIF; d: DeviceTablePtr) : CHAR ;


(*
   dounreadchar - pushes a CHAR back onto the file associated
                  with, g.
*)

PROCEDURE dounreadchar (g: GenDevIF; d: DeviceTablePtr; ch: CHAR) : CHAR ;


(*
   dogeterrno - returns the errno relating to the generic device.
*)

PROCEDURE dogeterrno (g: GenDevIF; d: DeviceTablePtr) : INTEGER ;


(*
   dorbytes - reads upto, max, bytes setting, actual, and
              returning FALSE if an error (not due to eof)
              occurred.
*)

PROCEDURE dorbytes (g: GenDevIF;
                    d: DeviceTablePtr;
                    to: ADDRESS;
                    max: CARDINAL;
                    VAR actual: CARDINAL) : BOOLEAN ;

(*
   dowbytes - writes up to, nBytes.  It returns FALSE
              if an error occurred and it sets actual
              to the amount of data written.
*)

PROCEDURE dowbytes (g: GenDevIF;
                    d: DeviceTablePtr;
                    from: ADDRESS;
                    nBytes: CARDINAL;
                    VAR actual: CARDINAL) : BOOLEAN ;


(*
   dowriteln - attempt to write an end of line marker to the
               file and returns TRUE if successful.
*)

PROCEDURE dowriteln (g: GenDevIF; d: DeviceTablePtr) : BOOLEAN ;


(*
   iseof - returns TRUE if end of file has been seen.
*)

PROCEDURE iseof (g: GenDevIF; d: DeviceTablePtr) : BOOLEAN ;


(*
   iseoln - returns TRUE if end of line has been seen.
*)

PROCEDURE iseoln (g: GenDevIF; d: DeviceTablePtr) : BOOLEAN ;


(*
   iserror - returns TRUE if an error was seen on the device.
             Note that reaching EOF is not classified as an
             error.
*)

PROCEDURE iserror (g: GenDevIF; d: DeviceTablePtr) : BOOLEAN ;


END RTfio.