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/* $Id: memrchr.cpp $ */
/** @file
* IPRT - CRT Strings, memrchr().
*/
/*
* Copyright (C) 2018-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "internal/iprt.h"
#include <iprt/string.h>
/**
* Search for a given byte starting at the end of the block.
*
* @returns Pointer on a match or NULL otherwise.
* @param pv Pointer to the block.
* @param ch The char to search for.
* @param cb The size of the block.
*/
#undef memrchr
void *RT_NOCRT(memrchr)(const void *pv, int ch, size_t cb)
{
if (cb)
{
const char *pbCur = (const char *)pv + cb - 1;
while (cb)
{
if (*pbCur == ch)
return (void *)pbCur;
pbCur--;
cb--;
}
}
return NULL;
}
RT_ALIAS_AND_EXPORT_NOCRT_SYMBOL(memrchr);
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