/* $Id: memrchr.cpp $ */ /** @file * IPRT - CRT Strings, memrchr(). */ /* * Copyright (C) 2018-2020 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. * * The contents of this file may alternatively be used under the terms * of the Common Development and Distribution License Version 1.0 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the * VirtualBox OSE 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. */ /********************************************************************************************************************************* * Header Files * *********************************************************************************************************************************/ #include /** * Search for a given byte starting at the end of the block. * * @returns Pointer on a match or NULL otherwise. * @param pb Pointer to the block. * @param ch The char to search for. * @param cb The size of the block. */ void *memrchr(const char *pb, int ch, size_t cb) { if (cb) { const char *pbCur = pb + cb - 1; while (cb) { if (*pbCur == ch) return (void *)pbCur; pbCur--; cb--; } } return NULL; }