(* RTgenif.def provide a generic device interface mechanism used by RTgen.

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 RTgenif ;

(*
    Title      : RTgenif
    Author     : Gaius Mulley
    System     : GNU Modula-2
    Date       : Mon Sep 22 17:13:45 2008
    Revision   : $Version$ 
    Description: provides a generic interface mechanism used
                 by RTgen.  This is not an ISO module but rather
                 a runtime support module.
*)

FROM SYSTEM IMPORT ADDRESS ;
FROM IOLink IMPORT DeviceId, DeviceTablePtr ;

TYPE
   GenDevIF ;
   readchar   = PROCEDURE (GenDevIF, DeviceTablePtr) : CHAR ;
   unreadchar = PROCEDURE (GenDevIF, DeviceTablePtr, CHAR) : CHAR ;
   geterrno   = PROCEDURE (GenDevIF, DeviceTablePtr) : INTEGER ;
   readbytes  = PROCEDURE (GenDevIF, DeviceTablePtr, ADDRESS, CARDINAL, VAR CARDINAL) : BOOLEAN ;
   writebytes = PROCEDURE (GenDevIF, DeviceTablePtr, ADDRESS, CARDINAL, VAR CARDINAL) : BOOLEAN ;
   writeln    = PROCEDURE (GenDevIF, DeviceTablePtr) : BOOLEAN ;
   iseof      = PROCEDURE (GenDevIF, DeviceTablePtr) : BOOLEAN ;
   iseoln     = PROCEDURE (GenDevIF, DeviceTablePtr) : BOOLEAN ;
   iserror    = PROCEDURE (GenDevIF, DeviceTablePtr) : BOOLEAN ;


(*
   InitGenDevIF - initializes a generic device.
*)

PROCEDURE InitGenDevIF (d     : DeviceId;
                        rc    : readchar;
                        urc   : unreadchar;
                        geterr: geterrno;
                        rbytes: readbytes;
                        wbytes: writebytes;
                        wl    : writeln;
                        eof   : iseof;
                        eoln  : iseoln;
                        iserr : iserror) : GenDevIF ;


(*
   getDID - returns the device id this generic interface.
*)

PROCEDURE getDID (g: GenDevIF) : DeviceId ;


(*
   doReadChar - returns the next character from the generic
                device.
*)

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


(*
   doUnReadChar - pushes back a character to the generic device.
*)

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 - attempts to read, n, bytes from the generic device.
              It set the actual amount read and returns a boolean
              to determine whether an error occurred.
*)

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


(*
   doWBytes - attempts to write, n, bytes to the generic device.
              It sets the actual amount written and returns a
              boolean to determine whether an error occurred.
*)

PROCEDURE doWBytes (g: GenDevIF; d: DeviceTablePtr;
                    from: ADDRESS; max: CARDINAL;
                    VAR actual: CARDINAL) : BOOLEAN ;


(*
   doWrLn - writes an end of line marker and returns
            TRUE if successful.
*)

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


(*
   isEOF - returns true if the end of file was reached.
*)

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


(*
   isEOLN - returns true if the end of line was reached.
*)

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


(*
   isError - returns true if an error was seen in the device.
*)

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


(*
   KillGenDevIF - deallocates a generic device.
*)

PROCEDURE KillGenDevIF (g: GenDevIF) : GenDevIF ;


END RTgenif.