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--- arpwatch-2.1a15/arpwatch.c.bogon	2007-08-09 13:53:47.000000000 +0200
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+++ arpwatch-2.1a15/arpwatch.c	2007-08-09 13:58:17.000000000 +0200
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@@ -730,11 +730,12 @@ addnet(register const char *str)
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 	/* XXX hack */
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 	n = ntohl(inet_addr(tstr));
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-	while ((n & 0xff000000) == 0) {
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-		n <<= 8;
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-		if (n == 0)
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-			return (0);
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-	}
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+	if (n || width != 32)
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+		while ((n & 0xff000000) == 0) {
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+			n <<= 8;
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+			if (n == 0)
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+				return (0);
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+		}
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 	n = htonl(n);
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 	if (width != 0) {