--- bw.c.orig	2011-02-06 09:11:51.000000000 +0100
+++ bw.c	2011-02-06 09:11:37.000000000 +0100
@@ -881,7 +881,7 @@
 {
 	struct ifreq	ifr;
 	
-	strncpy ( ifr.ifr_name, interface, strnlen ( interface ) + 1 );
+	strncpy ( ifr.ifr_name, interface, strnlen ( interface, 16 ) + 1 );
 	if ( ioctl ( sock, SIOCGIFFLAGS, &ifr ) == -1 ) {
 		perror ( "ioctl()" );
 		close ( sock );