File:  [gforth] / gforth / kernel / accept.fs
Revision 1.7: download - view: text, annotated - select for diffs
Sat Sep 23 15:47:09 2000 UTC (20 years, 10 months ago) by anton
Branches: MAIN
CVS tags: v0-5-0, HEAD
changed FSF address in copyright messages

    1: \ Input                                                13feb93py
    2: 
    3: \ Copyright (C) 1995,1996,1997,1999 Free Software Foundation, Inc.
    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
   19: \ Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111, USA.
   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
   25: 	#bs emit space #bs emit 1- rot 1- -rot
   26:     THEN false ;
   27: : (ret) ( max span addr pos1 -- max span addr pos2 flag )
   28:     true space ;
   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
   44:   dup bl u<  IF  cells ctrlkeys + perform  EXIT  THEN
   45:   >r 2over = IF  rdrop bell 0 EXIT  THEN
   46:   r> insert-char 0 ;
   47: 
   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 ;
   60: 

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