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(* Terminal.mod provides a Logitech 3.0 compatible and PIM [234] compatible.
Copyright (C) 2004-2025 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 Terminal ;
IMPORT Termbase ;
FROM ASCII IMPORT nul, cr, tab, lf ;
(*
Read - reads a single character, ch, from the underlying Termbase
module.
*)
PROCEDURE Read (VAR ch: CHAR) ;
BEGIN
Termbase.Read(ch)
END Read ;
(*
ReadAgain - makes the last character readable again.
*)
PROCEDURE ReadAgain ;
BEGIN
END ReadAgain ;
(*
KeyPressed - returns TRUE if a character can be read without blocking
the caller.
*)
PROCEDURE KeyPressed () : BOOLEAN ;
BEGIN
RETURN( Termbase.KeyPressed() )
END KeyPressed ;
(*
Write - writes a single character to the Termbase module.
*)
PROCEDURE Write (ch: CHAR) ;
BEGIN
Termbase.Write(ch)
END Write ;
(*
ReadString - reads a sequence of characters.
Tabs are expanded into 8 spaces and <cr> or <lf> terminates
the string.
*)
PROCEDURE ReadString (VAR s: ARRAY OF CHAR) ;
VAR
t, h, i: CARDINAL ;
BEGIN
i := 0 ;
h := HIGH(s) ;
IF i<=h
THEN
REPEAT
Read(s[i]) ;
IF (s[i]=cr) OR (s[i]=lf)
THEN
s[i] := nul ;
(* successful *)
RETURN
ELSIF s[i]=tab
THEN
t := 0 ;
REPEAT
s[i] := ' ' ;
INC(i) ;
IF i>h
THEN
RETURN
END ;
INC(t)
UNTIL t=8
END ;
INC(i)
UNTIL i>h
END
END ReadString ;
(*
WriteString - writes out a string which is terminated by a <nul>
character or the end of string HIGH(s).
*)
PROCEDURE WriteString (s: ARRAY OF CHAR) ;
VAR
i, h: CARDINAL ;
BEGIN
h := HIGH(s) ;
i := 0 ;
WHILE (i<=h) AND (s[i]#nul) DO
Write(s[i]) ;
INC(i)
END
END WriteString ;
(*
WriteLn - writes a lf character.
*)
PROCEDURE WriteLn ;
BEGIN
Write(lf)
END WriteLn ;
END Terminal.
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