15a9630b7Scgyurgyik //===-- Implementation of memrchr -----------------------------------------===// 25a9630b7Scgyurgyik // 35a9630b7Scgyurgyik // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 45a9630b7Scgyurgyik // See https://llvm.org/LICENSE.txt for license information. 55a9630b7Scgyurgyik // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 65a9630b7Scgyurgyik // 75a9630b7Scgyurgyik //===----------------------------------------------------------------------===// 85a9630b7Scgyurgyik 95a9630b7Scgyurgyik #include "src/string/memrchr.h" 105a9630b7Scgyurgyik #include "src/__support/common.h" 11*5ff3ff33SPetr Hosek #include "src/__support/macros/config.h" 125a9630b7Scgyurgyik #include <stddef.h> 135a9630b7Scgyurgyik 14*5ff3ff33SPetr Hosek namespace LIBC_NAMESPACE_DECL { 155a9630b7Scgyurgyik 16a0b65a7bSMichael Jones LLVM_LIBC_FUNCTION(void *, memrchr, (const void *src, int c, size_t n)) { 175a9630b7Scgyurgyik const unsigned char *str = reinterpret_cast<const unsigned char *>(src); 186d1543a1SAlex Brachet const unsigned char ch = static_cast<unsigned char>(c); 195a9630b7Scgyurgyik for (; n != 0; --n) { 205a9630b7Scgyurgyik const unsigned char *s = str + n - 1; 215a9630b7Scgyurgyik if (*s == ch) 225a9630b7Scgyurgyik return const_cast<unsigned char *>(s); 235a9630b7Scgyurgyik } 245a9630b7Scgyurgyik return nullptr; 255a9630b7Scgyurgyik } 265a9630b7Scgyurgyik 27*5ff3ff33SPetr Hosek } // namespace LIBC_NAMESPACE_DECL 28