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\ input output basics (extra since) 02mar97jaw
\ Copyright (C) 1995,1996,1997,1998,2000,2003 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.
require ./basics.fs
\ Output 13feb93py
has? os [IF]
0 Value outfile-id ( -- file-id ) \ gforth
0 Value infile-id ( -- file-id ) \ gforth
: (type) ( c-addr u -- ) \ gforth
outfile-id write-file drop \ !! use ?DUP-IF THROW ENDIF instead of DROP ?
;
: (emit) ( c -- ) \ gforth
outfile-id emit-file drop \ !! use ?DUP-IF THROW ENDIF instead of DROP ?
;
: (key) ( -- c ) \ gforth
infile-id key-file ;
: (key?) ( -- flag ) \ gforth
infile-id key?-file ;
[THEN]
undef-words
Defer type ( c-addr u -- ) \ core
\G If @var{u}>0, display @var{u} characters from a string starting
\G with the character stored at @var{c-addr}.
[IFDEF] write-file
: (type) 0 write-file drop ;
[ELSE]
: (type) BEGIN dup WHILE
>r dup c@ (emit) 1+ r> 1- REPEAT 2drop ;
[THEN]
[IFDEF] (type) ' (type) IS Type [THEN]
Defer emit ( c -- ) \ core
\G Display the character associated with character value c.
: (emit) ( c -- ) \ gforth
0 emit-file drop \ !! use ?DUP-IF THROW ENDIF instead of DROP ?
;
[IFDEF] (emit) ' (emit) IS emit [THEN]
Defer key ( -- char ) \ core
\G Receive (but do not display) one character, @var{char}.
[IFDEF] (key) ' (key) IS key [THEN]
Defer key? ( -- flag ) \ facility key-question
\G Determine whether a character is available. If a character is
\G available, @var{flag} is true; the next call to @code{key} will
\G yield the character. Once @code{key?} returns true, subsequent
\G calls to @code{key?} before calling @code{key} or @code{ekey} will
\G also return true.
[IFDEF] (key?) ' (key?) IS key? [THEN]
all-words
: (.") "lit count type ;
: (S") "lit count ;
\ Input 13feb93py
07 constant #bell ( -- c ) \ gforth
08 constant #bs ( -- c ) \ gforth
09 constant #tab ( -- c ) \ gforth
7F constant #del ( -- c ) \ gforth
0D constant #cr ( -- c ) \ gforth
\ the newline key code
0C constant #ff ( -- c ) \ gforth
0A constant #lf ( -- c ) \ gforth
: bell #bell emit [ has? os [IF] ] outfile-id flush-file drop [ [THEN] ] ;
: cr ( -- ) \ core c-r
\G Output a newline (of the favourite kind of the host OS). Note
\G that due to the way the Forth command line interpreter inserts
\G newlines, the preferred way to use @code{cr} is at the start
\G of a piece of text; e.g., @code{cr ." hello, world"}.
newline type ;
: space ( -- ) \ core
\G Display one space.
bl emit ;
has? ec [IF]
: spaces ( n -- ) \ core
\G If n > 0, display n spaces.
0 max 0 ?DO space LOOP ;
: backspaces 0 max 0 ?DO #bs emit LOOP ;
[ELSE]
\ space spaces 21mar93py
decimal
Create spaces ( u -- ) \ core
\G Display @var{n} spaces.
bl 80 times \ times from target compiler! 11may93jaw
DOES> ( u -- )
swap
0 max 0 ?DO I' I - &80 min 2dup type +LOOP drop ;
Create backspaces
08 80 times \ times from target compiler! 11may93jaw
DOES> ( u -- )
swap
0 max 0 ?DO I' I - &80 min 2dup type +LOOP drop ;
hex
[THEN]
|
