From 00a3b2eb3a2ba0470e5f07adb09d00662d3e89f3 Mon Sep 17 00:00:00 2001
From: Frank Lichtenheld <frank@lichtenheld.de>
Date: Tue, 11 Sep 2007 16:59:16 +0200
Subject: [PATCH] Deb::Versions: Fix a bug introduces by ~ handling

708b1364be58c9b921cc3838d7ed5f5b48959d78 fixed the handling
of ~ but broke the handling of comparing a "normal" letter
with the empty string. A letter sorts earlier than all
non-letter except ~, but of course not earlier as the empty string.
---
 lib/Deb/Versions.pm | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/lib/Deb/Versions.pm b/lib/Deb/Versions.pm
index ec127ce..fcc8e31 100644
--- a/lib/Deb/Versions.pm
+++ b/lib/Deb/Versions.pm
@@ -142,9 +142,9 @@ sub _lcmp {
     for ( my $i = 0; $i <= length( $v1 ); $i++ ) {
 	my ( $n1, $n2 ) = ( ord( substr( $v1, $i, 1 ) ), 
 			    ord( substr( $v2, $i, 1 ) ) );
-	$n1 += 256 if $n1 < 65; # letters sort earlier than non-letters
+	$n1 += 256 if $n1 && $n1 < 65; # letters sort earlier than non-letters
 	$n1 = -1 if $n1 == 126; # '~' sorts earlier than everything else
-	$n2 += 256 if $n2 < 65;
+	$n2 += 256 if $n2 && $n2 < 65;
 	$n2 = -1 if $n2 == 126;
 	if ( my $r = ($n1 <=> $n2) ) {
 	    return $r;
-- 
2.39.2