\ Input                                                13feb93py

\ Copyright (C) 1995,1996,1997,1999 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.

: (ins) ( max span addr pos1 key -- max span addr pos2 )
    >r 2dup + r@ swap c! r> emit 1+ rot 1+ -rot ;
: (bs) ( max span addr pos1 -- max span addr pos2 flag )
    dup IF
	#bs emit space #bs emit 1- rot 1- -rot
    THEN false ;
: (ret) ( max span addr pos1 -- max span addr pos2 flag )
    true space ;

Create ctrlkeys
  ] false false false false  false false false false
    (bs)  false (ret) false  false (ret) false false
    false false false false  false false false false
    false false false false  false false false false [

defer insert-char
' (ins) IS insert-char
defer everychar
' noop IS everychar

: decode ( max span addr pos1 key -- max span addr pos2 flag )
  everychar
  dup #del = IF  drop #bs  THEN  \ del is rubout
  dup bl u<  IF  cells ctrlkeys + perform  EXIT  THEN
  >r 2over = IF  rdrop bell 0 EXIT  THEN
  r> insert-char 0 ;

: accept   ( c-addr +n1 -- +n2 ) \ core
    \G Receive a string of at most @var{+n2} characters, and store it
    \G in memory starting at @var{c-addr}. The string is
    \G displayed. Input terminates when the <return> key is pressed or
    \G @var{n1} characters have been received. The normal Gforth line
    \G editing capabilites are available. @var{+n2} is the length of
    \G the string; it does not include the <return> character.
    dup 0< IF abs over dup 1 chars - c@ tuck type
	\ this allows to edit given strings
    ELSE 0 THEN rot over
    BEGIN key decode UNTIL
    2drop nip ;