Update to skip image file directives (^X...\n)

diff --git a/sys2ansi.pl b/sys2ansi.pl
index d4b47db..7c39e7e 100755 (executable)
--- a/sys2ansi.pl
+++ b/sys2ansi.pl
@@ -6,29 +6,40 @@
 #
 @ansicol = (0,4,2,6,1,5,3,7);
 
+$getting_file = 0;
+
 while ( read(STDIN, $ch, 1) > 0 ) {
     if ( $ch eq "\x1A" ) {     # <SUB> <Ctrl-Z> EOF
        last;
     } elsif ( $ch eq "\x0C" ) {        # <FF>  <Ctrl-L> Clear screen
-       print "\x1b[2J";
+       print "\x1b[2J" if ( !$getting_file );
     } elsif ( $ch eq "\x0F" ) {        # <SI>  <Ctrl-O> Attribute change
-       if ( read(STDIN, $attr, 2) == 2 ) {
-           $attr = hex $attr;
-           print "\x1b[0;";
-           if ( $attr & 0x80 ) {
-               print "5;";
-               $attr &= ~0x80;
-           }
-           if ( $attr & 0x08 ) {
-               print "1;";
-               $attr &= ~0x08;
+       if ( !$getting_file ) {
+           if ( read(STDIN, $attr, 2) == 2 ) {
+               $attr = hex $attr;
+               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;
            }
-           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 ( $ch eq "\x0D" ) {        # <CR>  <Ctrl-M> Carriage return
        # Ignore
-    } else {
+    } elsif ( $ch eq "\x0A" ) { # <LF>  <Ctrl-J> Line feed
+       $getting_file = 0;
        print $ch;
+    } else {
+       print $ch if ( !$getting_file );
     }
 }