/usr/bin/syslinux2ansi is in syslinux-common 3:4.05+dfsg-6+deb8u1.
This file is owned by root:root, with mode 0o755.
The actual contents of the file can be viewed below.
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 | #!/usr/bin/perl
#
# Perl script to convert a Syslinux-format screen to PC-ANSI
# to display in a color xterm or on the Linux console
#
@ansicol = (0,4,2,6,1,5,3,7);
$getting_file = 0;
$enable = 1;
while ( read(STDIN, $ch, 1) > 0 ) {
if ( $ch eq "\x1A" ) { # <SUB> <Ctrl-Z> EOF
last;
} elsif ( $ch eq "\x0C" ) { # <FF> <Ctrl-L> Clear screen
print "\x1b[2J" if ( $enable && !$getting_file );
} elsif ( $ch eq "\x0F" ) { # <SI> <Ctrl-O> Attribute change
if ( !$getting_file ) {
if ( read(STDIN, $attr, 2) == 2 ) {
$attr = hex $attr;
if ( $enable ) {
print "\x1b[0;";
if ( $attr & 0x80 ) {
print "5;";
$attr &= ~0x80;
}
if ( $attr & 0x08 ) {
print "1;";
$attr &= ~0x08;
}
printf "%d;%dm",
$ansicol[$attr >> 4] + 40, $ansicol[$attr & 7] + 30;
}
}
}
} elsif ( $ch eq "\x18" ) { # <CAN> <Ctrl-X> Display image
# We can't display an image; pretend to be a text screen
# Ignore all input until end of line
$getting_file = 1;
} elsif ( (ord($ch) & ~07) == 0x10 ) { # Mode controls
$enable = (ord($ch) & 0x01); # Emulate the text screen
} elsif ( $ch eq "\x0D" ) { # <CR> <Ctrl-M> Carriage return
# Ignore
} elsif ( $ch eq "\x0A" ) { # <LF> <Ctrl-J> Line feed
if ( $getting_file ) {
$getting_file = 0;
} else {
print $ch if ( $enable );
}
} else {
print $ch if ( $enable && !$getting_file );
}
}
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