(* IO.def provides Read, Write, Errors procedures mapping onto 0, 1 and 2.

Copyright (C) 2001-2023 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 IO ;

(*
   Author     : Gaius Mulley
   Title      : IO
   Date       : 3/4/86  [$Date: 2010/10/03 19:01:10 $]
   SYSTEM     : GNU Modula-2
   Description: provides Read, Write, Errors procedures that map onto UNIX
                file descriptors 0, 1 and 2. This is achieved by using
                FIO if we are in buffered mode and using libc.write
                if not.
   Version    : $Revision: 1.6 $
*)

EXPORT QUALIFIED Read, Write, Error,
                 UnBufferedMode, BufferedMode,
                 EchoOn, EchoOff ;


PROCEDURE Read (VAR ch: CHAR) ;
PROCEDURE Write (ch: CHAR) ;
PROCEDURE Error (ch: CHAR) ;


(*
   UnBufferedMode - places file descriptor, fd, into an unbuffered mode.
*)

PROCEDURE UnBufferedMode (fd: INTEGER; input: BOOLEAN) ;


(*
   BufferedMode - places file descriptor, fd, into a buffered mode.
*)

PROCEDURE BufferedMode (fd: INTEGER; input: BOOLEAN) ;


(*
   EchoOn - turns on echoing for file descriptor, fd.  This
            only really makes sence for a file descriptor opened
            for terminal input or maybe some specific file descriptor
            which is attached to a particular piece of hardware.
*)

PROCEDURE EchoOn (fd: INTEGER; input: BOOLEAN) ;


(*
   EchoOff - turns off echoing for file descriptor, fd.  This
             only really makes sence for a file descriptor opened
             for terminal input or maybe some specific file descriptor
             which is attached to a particular piece of hardware.
*)

PROCEDURE EchoOff (fd: INTEGER; input: BOOLEAN) ;


END IO.