sys2ansi.pl

   1 #!/usr/bin/perl
   2 # $Id$
   3 #
   4 # Perl script to convert a Syslinux-format screen to PC-ANSI
   5 # to display in a color xterm or on the Linux console
   6 #
   7
   8 @ansicol = (0,4,2,6,1,5,3,7);
   9
  10 $getting_file = 0;
  11 $enable = 1;
  12
  13 while ( read(STDIN, $ch, 1) > 0 ) {
  14     if ( $ch eq "\x1A" ) {      # <SUB> <Ctrl-Z> EOF
  15         last;
  16     } elsif ( $ch eq "\x0C" ) { # <FF>  <Ctrl-L> Clear screen
  17         print "\x1b[2J" if ( $enable && !$getting_file );
  18     } elsif ( $ch eq "\x0F" ) { # <SI>  <Ctrl-O> Attribute change
  19         if ( !$getting_file ) {
  20             if ( read(STDIN, $attr, 2) == 2 ) {
  21                 $attr = hex $attr;
  22                 if ( $enable ) {
  23                     print "\x1b[0;";
  24                     if ( $attr & 0x80 ) {
  25                         print "5;";
  26                         $attr &= ~0x80;
  27                     }
  28                     if ( $attr & 0x08 ) {
  29                         print "1;";
  30                         $attr &= ~0x08;
  31                     }
  32                     printf "%d;%dm",
  33                     $ansicol[$attr >> 4] + 40, $ansicol[$attr & 7] + 30;
  34                 }
  35             }
  36         }
  37     } elsif ( $ch eq "\x18" ) { # <CAN> <Ctrl-X> Display image
  38         # We can't display an image; pretend to be a text screen
  39         # Ignore all input until end of line
  40         $getting_file = 1;
  41     } elsif ( (ord($ch) & ~07) == 0x10 ) { # Mode controls
  42         $enable = (ord($ch) & 0x01); # Emulate the text screen
  43     } elsif ( $ch eq "\x0D" ) { # <CR>  <Ctrl-M> Carriage return
  44         # Ignore
  45     } elsif ( $ch eq "\x0A" ) { # <LF>  <Ctrl-J> Line feed
  46         if ( $getting_file ) {
  47             $getting_file = 0;
  48         } else {
  49             print $ch if ( $enable );
  50         }
  51     } else {
  52         print $ch if ( $enable && !$getting_file );
  53     }
  54 }