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(* RTfio.mod implement 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/>. *)
IMPLEMENTATION MODULE RTfio ;
FROM IOLink IMPORT DeviceTablePtr ;
FROM RTio IMPORT GetFile ;
FROM errno IMPORT geterrno ;
FROM FIO IMPORT File, ReadChar, UnReadChar, WriteChar, ReadNBytes, WriteNBytes, IsActive,
WriteLine, EOF, WasEOLN, IsNoError ;
(*
doreadchar - returns a CHAR from the file associated with, g.
*)
PROCEDURE doreadchar (g: GenDevIF; d: DeviceTablePtr) : CHAR ;
VAR
f: File ;
BEGIN
WITH d^ DO
f := GetFile(cid) ;
RETURN( ReadChar(f) )
END
END doreadchar ;
(*
dounreadchar - pushes a CHAR back onto the file associated with, g.
*)
PROCEDURE dounreadchar (g: GenDevIF; d: DeviceTablePtr; ch: CHAR) : CHAR ;
VAR
f: File ;
BEGIN
WITH d^ DO
f := GetFile(cid) ;
UnReadChar(f, ch) ;
RETURN( ch )
END
END dounreadchar ;
(*
dogeterrno - returns the errno relating to the generic device.
*)
PROCEDURE dogeterrno (g: GenDevIF; d: DeviceTablePtr) : INTEGER ;
BEGIN
RETURN geterrno()
END dogeterrno ;
(*
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 ;
VAR
f: File ;
BEGIN
WITH d^ DO
f := GetFile(cid) ;
actual := ReadNBytes(f, max, to) ;
RETURN( IsNoError(f) )
END
END dorbytes ;
(*
dowbytes -
*)
PROCEDURE dowbytes (g: GenDevIF; d: DeviceTablePtr;
from: ADDRESS;
nBytes: CARDINAL;
VAR actual: CARDINAL) : BOOLEAN ;
VAR
f: File ;
BEGIN
WITH d^ DO
f := GetFile(cid) ;
actual := WriteNBytes(f, nBytes, from) ;
RETURN( IsNoError(f) )
END
END dowbytes ;
(*
dowriteln - attempt to write an end of line marker to the
file and returns TRUE if successful.
*)
PROCEDURE dowriteln (g: GenDevIF; d: DeviceTablePtr) : BOOLEAN ;
VAR
f: File ;
BEGIN
f := GetFile(d^.cid) ;
WriteLine(f) ;
RETURN( IsNoError(f) )
END dowriteln ;
(*
iseof - returns TRUE if end of file has been seen.
*)
PROCEDURE iseof (g: GenDevIF; d: DeviceTablePtr) : BOOLEAN ;
VAR
f: File ;
BEGIN
WITH d^ DO
f := GetFile(cid) ;
RETURN( EOF(f) )
END
END iseof ;
(*
iseoln - returns TRUE if end of line is seen.
*)
PROCEDURE iseoln (g: GenDevIF; d: DeviceTablePtr) : BOOLEAN ;
VAR
f: File ;
BEGIN
WITH d^ DO
f := GetFile(cid) ;
RETURN( WasEOLN(f) )
END
END iseoln ;
(*
iserror - returns TRUE if an error was seen on the device.
*)
PROCEDURE iserror (g: GenDevIF; d: DeviceTablePtr) : BOOLEAN ;
VAR
f: File ;
BEGIN
WITH d^ DO
f := GetFile(cid) ;
RETURN( IsActive(f) AND (NOT IsNoError(f)) )
END
END iserror ;
END RTfio.
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