\ extended characters (either 8bit or UTF-8, possibly other encodings)
\ and their fixed-size variant
\ Copyright (C) 2005 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.
\ We can do some of these (and possibly faster) by just using the
\ utf-8 words with an appropriate setting of max-single-byte, but I
\ like to see how an 8bit setting without UTF-8 stuff looks like.
DEFER XEMIT ( xc -- )
DEFER XKEY ( -- xc )
DEFER XCHAR+ ( xc-addr1 -- xc-addr2 )
DEFER XCHAR- ( xc-addr1 -- xc-addr2 )
DEFER +X/STRING ( xc-addr1 u1 -- xc-addr2 u2 )
DEFER -X/STRING ( xc-addr1 u1 -- xc-addr2 u2 )
DEFER XC@ ( xc-addr -- xc )
DEFER XC!+? ( xc xc-addr1 u1 -- xc-addr2 u2 f ) \ f if operation succeeded
DEFER XC@+ ( xc-addr1 -- xc-addr2 xc )
DEFER XC-SIZE ( xc -- u ) \ size in cs
DEFER -TRAILING-GARBAGE ( addr u1 -- addr u2 ) \ remove trailing incomplete xc
\ fixed-size versions of these words
: char- ( c-addr1 -- c-addr2 )
[ 1 chars ] literal - ;
: 1/string ( c-addr1 u1 -- c-addr2 u2 )
1 /string ;
: -1/string ( c-addr1 u1 -- c-addr2 u2 )
-1 /string ;
: c!+? ( c c-addr1 u1 -- c-addr2 u2 f )
1 chars u< if \ or use < ?
>r dup >r c!
1 r> r> /string true
else
rot drop false
then ;
: c-size ( c -- 1 )
drop 1 ;
: set-encoding-fixed-width ( -- )
['] emit is xemit
['] key is xkey
['] char+ is xchar+
['] char- is xchar-
['] 1/string is +x/string
['] -1/string is -x/string
['] c@ is xc@
['] c!+? is xc!+?
['] count is xc@+
['] c-size is xc-size
['] noop is -trailing-garbage
;
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