2006-05-10 13:21:01 +00:00
parent 32df5cc373
commit eedfdfbe6e
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+/*
+ * minor network-address manipulation utilities
+ * Copyright (C) 1998, 1999  Henry Spencer.
+ * 
+ * This library is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU Library General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or (at your
+ * option) any later version.  See <http://www.fsf.org/copyleft/lgpl.txt>.
+ * 
+ * This library is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+ * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Library General Public
+ * License for more details.
+ *
+ * RCSID $Id: subnetof.c,v 1.1 2004/03/15 20:35:26 as Exp $
+ */
+#include "internal.h"
+#include "freeswan.h"
+
+/*
+ - subnetof - given address and mask, return subnet part
+ */
+struct in_addr
+subnetof(addr, mask)
+struct in_addr addr;
+struct in_addr mask;
+{
+	struct in_addr result;
+
+	result.s_addr = addr.s_addr & mask.s_addr;
+	return result;
+}
+
+/*
+ - hostof - given address and mask, return host part
+ */
+struct in_addr
+hostof(addr, mask)
+struct in_addr addr;
+struct in_addr mask;
+{
+	struct in_addr result;
+
+	result.s_addr = addr.s_addr & ~mask.s_addr;
+	return result;
+}
+
+/*
+ - broadcastof - given (network) address and mask, return broadcast address
+ */
+struct in_addr
+broadcastof(addr, mask)
+struct in_addr addr;
+struct in_addr mask;
+{
+	struct in_addr result;
+
+	result.s_addr = addr.s_addr | ~mask.s_addr;
+	return result;
+}