Annotation of gforth/kernel/accept.fs, revision 1.7

1.1       anton       1: \ Input                                                13feb93py
                      2: 
1.6       anton       3: \ Copyright (C) 1995,1996,1997,1999 Free Software Foundation, Inc.
1.1       anton       4: 
                      5: \ This file is part of Gforth.
                      6: 
                      7: \ Gforth is free software; you can redistribute it and/or
                      8: \ modify it under the terms of the GNU General Public License
                      9: \ as published by the Free Software Foundation; either version 2
                     10: \ of the License, or (at your option) any later version.
                     11: 
                     12: \ This program is distributed in the hope that it will be useful,
                     13: \ but WITHOUT ANY WARRANTY; without even the implied warranty of
                     14: \ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
                     15: \ GNU General Public License for more details.
                     16: 
                     17: \ You should have received a copy of the GNU General Public License
                     18: \ along with this program; if not, write to the Free Software
1.7     ! anton      19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
1.1       anton      20: 
                     21: : (ins) ( max span addr pos1 key -- max span addr pos2 )
                     22:     >r 2dup + r@ swap c! r> emit 1+ rot 1+ -rot ;
                     23: : (bs) ( max span addr pos1 -- max span addr pos2 flag )
                     24:     dup IF
1.5       anton      25:        #bs emit space #bs emit 1- rot 1- -rot
1.1       anton      26:     THEN false ;
1.5       anton      27: : (ret) ( max span addr pos1 -- max span addr pos2 flag )
                     28:     true space ;
1.1       anton      29: 
                     30: Create ctrlkeys
                     31:   ] false false false false  false false false false
                     32:     (bs)  false (ret) false  false (ret) false false
                     33:     false false false false  false false false false
                     34:     false false false false  false false false false [
                     35: 
                     36: defer insert-char
                     37: ' (ins) IS insert-char
                     38: defer everychar
                     39: ' noop IS everychar
                     40: 
                     41: : decode ( max span addr pos1 key -- max span addr pos2 flag )
                     42:   everychar
                     43:   dup #del = IF  drop #bs  THEN  \ del is rubout
1.3       pazsan     44:   dup bl u<  IF  cells ctrlkeys + perform  EXIT  THEN
1.1       anton      45:   >r 2over = IF  rdrop bell 0 EXIT  THEN
                     46:   r> insert-char 0 ;
                     47: 
1.4       crook      48: : accept   ( c-addr +n1 -- +n2 ) \ core
                     49:     \G Receive a string of at most @var{+n2} characters, and store it
                     50:     \G in memory starting at @var{c-addr}. The string is
                     51:     \G displayed. Input terminates when the <return> key is pressed or
                     52:     \G @var{n1} characters have been received. The normal Gforth line
                     53:     \G editing capabilites are available. @var{+n2} is the length of
                     54:     \G the string; it does not include the <return> character.
                     55:     dup 0< IF abs over dup 1 chars - c@ tuck type
                     56:        \ this allows to edit given strings
                     57:     ELSE 0 THEN rot over
                     58:     BEGIN key decode UNTIL
                     59:     2drop nip ;
1.1       anton      60: 

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