\ a very simple accept approach
\ Copyright (C) 1995,1996,1997,1998,1999,2000,2003 Free Software Foundation, Inc.
\ This file is part of Gforth.
\ Gforth 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 2
\ of the License, or (at your option) any later version.
\ This program 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.
\ You should have received a copy of the GNU General Public License
\ along with this program; if not, write to the Free Software
\ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
\ : xon $11 emit ;
\ : xoff $13 emit ;
Variable echo -1 echo !
: accept ( adr len -- len )
( xon ) over + over ( start end pnt ) eof off
key dup #del = IF drop #bs THEN
dup bl u<
dup #cr = over #lf = or IF
echo @ IF space THEN drop nip swap - ( xoff ) EXIT THEN
dup #eof = IF eof on THEN
#bs = IF 3 pick over <> over 0> and
IF 1 chars -
echo @ IF #bs emit bl emit #bs emit THEN
ELSE echo @ IF bell THEN THEN THEN
ELSE >r 2dup <> IF r>
echo @ IF dup emit THEN
over c! char+ ELSE r> drop bell THEN