screen.4th revision 280924 
1\ Copyright (c) 2003 Scott Long <scottl@FreeBSD.org>
2\ Copyright (c) 2015 Devin Teske <dteske@FreeBSD.org>
3\ All rights reserved.
4\ 
5\ Redistribution and use in source and binary forms, with or without
6\ modification, are permitted provided that the following conditions
7\ are met:
8\ 1. Redistributions of source code must retain the above copyright
9\    notice, this list of conditions and the following disclaimer.
10\ 2. Redistributions in binary form must reproduce the above copyright
11\    notice, this list of conditions and the following disclaimer in the
12\    documentation and/or other materials provided with the distribution.
13\ 
14\ THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
15\ ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
16\ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
17\ ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
18\ FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
19\ DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
20\ OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
21\ HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
22\ LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
23\ OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
24\ SUCH DAMAGE.
25\ 
26\ $FreeBSD: head/sys/boot/forth/screen.4th 280924 2015-03-31 22:32:35Z dteske $
27
28marker task-screen.4th
29
30: escc	( -- )	\ emit Esc-[
31	91 27 emit emit
32;
33
34: ho	( -- )	\ Home cursor
35	escc 72 emit	\ Esc-[H
36;
37
38: cld	( -- )	\ Clear from current position to end of display
39	escc 74 emit	\ Esc-[J
40;
41
42: clear	( -- )	\ clear screen
43	ho cld
44;
45
46: at-xy	( x y -- )	\ move cursor to x rows, y cols (1-based coords)
47	escc .# 59 emit .# 72 emit	\ Esc-[%d;%dH
48;
49
50: fg	( x -- )	\ Set foreground color
51	escc 3 .# .# 109 emit	\ Esc-[3%dm
52;
53
54: bg	( x -- )	\ Set background color
55	escc 4 .# .# 109 emit	\ Esc-[4%dm
56;
57
58: me	( -- )	\ Mode end (clear attributes)
59	escc 109 emit
60;
61