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added EDIT-LINE; ACCEPT now gives an error on negative input
fixed ACCEPT documentation

\ 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 ;

: edit-line ( c-addr n1 n2 -- n3 ) \ gforth
    \G edit the string with length @var{n2} in the buffer @var{c-addr
    \G n1}, like @code{accept}.
    rot over
    2dup type
    BEGIN key decode UNTIL
    2drop nip ;
    
: accept   ( c-addr +n1 -- +n2 ) \ core
    \G Get a string of up to @var{n1} characters from the user input
    \G device and store it at @var{c-addr}.  @var{n2} is the length of
    \G the received string. The user indicates the end by pressing
    \G @key{RET}.  Gforth supports all the editing functions available
    \G on the Forth command line (including history and word
    \G completion) in @code{accept}.
    dup 0< -&24 and throw \ use edit-line to edit given strings
    0 edit-line ;