82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
/*
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* This file is part of the Sofia-SIP package
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*
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* Copyright (C) 2005 Nokia Corporation.
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*
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* Contact: Pekka Pessi <pekka.pessi@nokia.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public License
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* as published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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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
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
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* 02110-1301 USA
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*
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*/
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/**@file memcspn.c
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* @brief The memcspn() replacement function.
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*
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* @author Pekka Pessi <Pekka.Pessi@nokia.com>
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*
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* @date Created: Thu Nov 17 17:45:51 EET 2005 ppessi
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*/
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#include "config.h"
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#include <string.h>
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#include <limits.h>
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/**Search memory for bytes not in a given set.
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*
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* The memcspn() function calculates the length of the memory area @a mem
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* which consists entirely of bytes not in @a reject.
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*
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* @param mem pointer to memory area
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* @param memlen size of @a mem in bytes
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* @param reject pointer to table containing bytes to reject
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* @param rejectlen size of @a reject table
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*
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* @return
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* The memspn() function returns the number of bytes in the memory area @a
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* which consists entirely of bytes not in @a reject.
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* @par
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* If @a rejectlen is 0, or @a reject is NULL, it returns @a memlen, size of
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* the memory area.
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*/
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size_t memcspn(const void *mem, size_t memlen,
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const void *reject, size_t rejectlen)
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{
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size_t i;
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unsigned char const *m = mem, *r = reject;
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char rejected[UCHAR_MAX + 1];
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if (rejectlen == 0 || reject == 0)
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return memlen;
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if (mem == NULL || memlen == 0)
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return 0;
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memset(rejected, 0, sizeof rejected);
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for (i = 0; i < rejectlen; i++)
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rejected[r[i]] = 1;
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for (i = 0; i < memlen; i++)
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if (rejected[m[i]])
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break;
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return i;
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}
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