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66 lines
2.3 KiB
C
66 lines
2.3 KiB
C
/*
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* edns-subnet/edns-subnet.c - Subnet option related constants
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*
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* Copyright (c) 2013, NLnet Labs. All rights reserved.
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*
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* This software is open source.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* Redistributions of source code must retain the above copyright notice,
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* this list of conditions and the following disclaimer.
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*
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* Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* Neither the name of the NLNET LABS nor the names of its contributors may
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* be used to endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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* A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
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* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
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* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
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* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
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* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* \file
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* Subnet option related constants.
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*/
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#include "config.h"
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#ifdef CLIENT_SUBNET /* keeps splint happy */
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#include "edns-subnet/edns-subnet.h"
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#include <string.h>
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int
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copy_clear(uint8_t* dst, size_t dstlen, uint8_t* src, size_t srclen, size_t n)
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{
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size_t intpart = n / 8; /* bytes */
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size_t fracpart = n % 8; /* bits */
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size_t written = intpart;
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if (intpart > dstlen || intpart > srclen)
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return 1;
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if (fracpart && (intpart+1 > dstlen || intpart+1 > srclen))
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return 1;
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memcpy(dst, src, intpart);
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if (fracpart) {
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dst[intpart] = src[intpart] & ~(0xFF >> fracpart);
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written++;
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}
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memset(dst + written, 0, dstlen - written);
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return 0;
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}
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#endif /* CLIENT_SUBNET */
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