Branch
Hash :
1a08f436
Author :
Date :
2010-08-25T09:23:17
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96
\ ========== Copyright Header Begin ==========================================
\
\ Hypervisor Software File: buffer.fth
\
\ Copyright (c) 2006 Sun Microsystems, Inc. All Rights Reserved.
\
\ - Do no alter or remove copyright notices
\
\ - Redistribution and use of this software in source and binary forms, with
\ or without modification, are permitted provided that the following
\ conditions are met:
\
\ - Redistribution of source code must retain the above copyright notice,
\ this list of conditions and the following disclaimer.
\
\ - Redistribution in binary form must reproduce the above copyright notice,
\ this list of conditions and the following disclaimer in the
\ documentation and/or other materials provided with the distribution.
\
\ Neither the name of Sun Microsystems, Inc. or the names of contributors
\ may be used to endorse or promote products derived from this software
\ without specific prior written permission.
\
\ This software is provided "AS IS," without a warranty of any kind.
\ ALL EXPRESS OR IMPLIED CONDITIONS, REPRESENTATIONS AND WARRANTIES,
\ INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY, FITNESS FOR A
\ PARTICULAR PURPOSE OR NON-INFRINGEMENT, ARE HEREBY EXCLUDED. SUN
\ MICROSYSTEMS, INC. ("SUN") AND ITS LICENSORS SHALL NOT BE LIABLE FOR
\ ANY DAMAGES SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR
\ DISTRIBUTING THIS SOFTWARE OR ITS DERIVATIVES. IN NO EVENT WILL SUN
\ OR ITS LICENSORS BE LIABLE FOR ANY LOST REVENUE, PROFIT OR DATA, OR
\ FOR DIRECT, INDIRECT, SPECIAL, CONSEQUENTIAL, INCIDENTAL OR PUNITIVE
\ DAMAGES, HOWEVER CAUSED AND REGARDLESS OF THE THEORY OF LIABILITY,
\ ARISING OUT OF THE USE OF OR INABILITY TO USE THIS SOFTWARE, EVEN IF
\ SUN HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.
\
\ You acknowledge that this software is not designed, licensed or
\ intended for use in the design, construction, operation or maintenance of
\ any nuclear facility.
\
\ ========== Copyright Header End ============================================
\ id: @(#)buffer.fth 1.2 97/01/20
\ purpose:
\ copyright: Copyright 1997 Sun Microsystems, Inc. All Rights Reserved
\ Keyboard buffer definitions
\ keybuf which is defined below is scanned
\ by the refresh routine, and the keyboard-driver. Then later
\ the keys are picked up by the monitor busywait keyboard routine, or
\ by Unix or other application programs directly.
\
\ Note that each keystroke, if typed slowly (by computer standards)
\ takes 3 bytes: a key-down, a key-up, and a keyboard-idle. so allocate
\ three times as much room as you want to be able to type ahead.
\ typeahead won't echo immediately in the monitor, but will echo in
\ its proper place in the i/o transcript.
headerless
d# 90 constant keybufsize
keybufsize buffer: keybuf
0 value getptr
0 value putptr
0 value endptr
: initkeybuf ( -- )
keybuf is getptr
keybuf is putptr
keybuf keybufsize + is endptr
;
\ put key into keybord buffer, ignoring overun
: bput ( key -- ) \ put key into buffer
putptr endptr >= if
keybuf is putptr
then
putptr c! putptr 1+ is putptr
;
\ clear the keyboard buffer for put task
: bputclr ( -- )
getptr is putptr
;
\ return the next key
: bget ( -- key ) \ Fetch a key from buffer
getptr endptr >= if
keybuf is getptr
then
getptr c@ getptr 1+ is getptr
;
\ return TRUE if keybuf is empty.
: keybuf-empty? ( -- flag ) \ True if keybuf is empty.
getptr putptr =
;