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#!/usr/bin/env perl
# $XTermId: decsed.pl,v 1.6 2015/02/22 01:37:20 tom Exp $
# -----------------------------------------------------------------------------
# this file is part of xterm
#
# Copyright 2015 by Thomas E. Dickey
#
# All Rights Reserved
#
# Permission is hereby granted, free of charge, to any person obtaining a
# copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
#
# The above copyright notice and this permission notice shall be included
# in all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
# OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE ABOVE LISTED COPYRIGHT HOLDER(S) BE LIABLE FOR ANY
# CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
# TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
# SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
#
# Except as contained in this notice, the name(s) of the above copyright
# holders shall not be used in advertising or otherwise to promote the
# sale, use or other dealings in this Software without prior written
# authorization.
# -----------------------------------------------------------------------------
# Exercise DECSED (erase display) with or without DECSCA (protect against
# DECSED).
use strict;
use Getopt::Std;
our ( $opt_c, $opt_n, $opt_p, $opt_w );
our ( $lineno, $test_string, $term_wide, $term_high );
sub move($$) {
my $y = shift;
my $x = shift;
printf "\x1b[%d;%dH", $y, $x;
}
sub protect($) {
my $code = shift;
printf "\x1b[%d\"q", $code;
}
sub set_color($) {
my $code = shift;
if ( $code == 1 ) {
printf "\x1b[0;36;44m"; # cyan-on-blue
}
else {
printf "\x1b[0;39;49m";
}
}
# returns a string of two-column characters given an ASCII alpha/numeric string
sub double_cells($) {
my $value = $_[0];
$value =~ s/ / /g;
pack(
"U*",
map {
( $_ <= 32 || $_ > 127 ) # if non-ASCII character...
? 32 # ...just show a blank
: ( 0xff00 + ( $_ - 32 ) ) # map to "Fullwidth Form"
} unpack( "C*", $value )
); # unpack unsigned-char characters
}
# write the text for the given line-number
sub fill_line($$) {
my $number = shift;
my $offset = shift;
my $length = $opt_w ? ( $term_wide / 2 ) : $term_wide;
my $actual;
my $margin = 0;
$actual = $length;
my $string = $test_string;
while ( ( $opt_w ? ( 2 * length($string) ) : length($string) ) <
( $offset + $length ) )
{
$string = $string . $test_string;
}
$string = substr( $string, $offset, $length );
$string = double_cells($string) if ($opt_w);
printf "%s", $string;
printf "\n";
return ++$offset;
}
sub main::HELP_MESSAGE() {
printf STDERR <<EOF
Usage: $0 [options] DECSED [y [x]]
The test
fills the screen (-n for normal, -w for wide characters, default DECALN)
then positions to the given y,x (default is middle of screen),
writes a '*' at the cursor position
moves back to given y,x again
erases with the DECSED value (0=below, 1=above, 2=all=default),
moves the cursor up/down one line to avoid overwriting by prompt
Options:
-c use color
-n write normal-characters rather than using DECALN
-p protect screen against erasure using DECSCA (DECALN is unprotected)
-w write wide-characters rather than using DECALN
EOF
;
exit;
}
&getopts('cnpw') || &main::HELP_MESSAGE;
$term_wide = `tput cols`;
$term_high = `tput lines`;
$test_string =
"0123456789 ABCDEFGHIJKLMNOPQRSTUVWXYZ abcdefghijklmnopqrstuvwxyz";
my $parm_DECSED = ( $#ARGV >= 0 ) ? $ARGV[0] : 2;
my $parm_ycoord = ( $#ARGV >= 1 ) ? $ARGV[1] : $term_high / 2;
my $parm_xcoord = ( $#ARGV >= 2 ) ? $ARGV[2] : $term_wide / 2;
binmode( STDOUT, ":utf8" );
&protect(1) if ($opt_p);
&set_color(1) if ($opt_c);
if ( $opt_n or $opt_w ) {
my $offset = 0;
for ( $lineno = 0 ; $lineno < $term_high - 1 ; ++$lineno ) {
$offset = &fill_line( $lineno, $offset );
}
}
else {
printf "\x1b#8"; # DECALN
}
&move( $parm_ycoord, $parm_xcoord );
printf '*';
&move( $parm_ycoord, $parm_xcoord );
printf "\x1b[?%dJ", $parm_DECSED;
if ( $parm_DECSED == 0 ) {
&move( $parm_ycoord + 1, $parm_xcoord );
}
elsif ( $parm_DECSED == 1 ) {
&move( $parm_ycoord - 1, $parm_xcoord );
}
&set_color(0) if ($opt_c);
&protect(0) if ($opt_p);
exit;
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