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