From 562e0e2d3d55b6fe0c3787987fdee5623f09bf5f Mon Sep 17 00:00:00 2001
From: hpa <hpa>
Date: Mon, 9 Apr 2001 23:12:06 +0000
Subject: [PATCH] Support mode controls.

---
 sys2ansi.pl | 36 ++++++++++++++++++++++--------------
 1 file changed, 22 insertions(+), 14 deletions(-)

diff --git a/sys2ansi.pl b/sys2ansi.pl
index 7c39e7e..d9bec7f 100755
--- a/sys2ansi.pl
+++ b/sys2ansi.pl
@@ -7,39 +7,47 @@
 @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 ( $ch eq "\x0C" ) {	# <FF>  <Ctrl-L> Clear screen
-	print "\x1b[2J" if ( !$getting_file );
+	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;
-		print "\x1b[0;";
-		if ( $attr & 0x80 ) {
-		    print "5;";
-		    $attr &= ~0x80;
+		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;
 		}
-		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
-	$getting_file = 0;
-	print $ch;
+	if ( $getting_file ) {
+	    $getting_file = 0;
+	} else {
+	    print $ch if ( $enable );
+	}
     } else {
-	print $ch if ( !$getting_file );
+	print $ch if ( $enable && !$getting_file );
     }
 }
-- 
2.7.4