1db8a88feSMichael Jones //===-- Implementation of memccpy ----------------------------------------===// 2db8a88feSMichael Jones // 3db8a88feSMichael Jones // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4db8a88feSMichael Jones // See https://llvm.org/LICENSE.txt for license information. 5db8a88feSMichael Jones // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6db8a88feSMichael Jones // 7db8a88feSMichael Jones //===----------------------------------------------------------------------===// 8db8a88feSMichael Jones 9db8a88feSMichael Jones #include "src/string/memccpy.h" 10db8a88feSMichael Jones 11db8a88feSMichael Jones #include "src/__support/common.h" 12db8a88feSMichael Jones #include <stddef.h> // For size_t. 13db8a88feSMichael Jones 14db8a88feSMichael Jones namespace __llvm_libc { 15db8a88feSMichael Jones 16db8a88feSMichael Jones LLVM_LIBC_FUNCTION(void *, memccpy, 17db8a88feSMichael Jones (void *__restrict dest, const void *__restrict src, int c, 18db8a88feSMichael Jones size_t count)) { 19db8a88feSMichael Jones unsigned char end = static_cast<unsigned char>(c); 20*1c92911eSMichael Jones const unsigned char *uc_src = static_cast<const unsigned char *>(src); 21*1c92911eSMichael Jones unsigned char *uc_dest = static_cast<unsigned char *>(dest); 22db8a88feSMichael Jones size_t i = 0; 23db8a88feSMichael Jones // Copy up until end is found. 24*1c92911eSMichael Jones for (; i < count && uc_src[i] != end; ++i) 25*1c92911eSMichael Jones uc_dest[i] = uc_src[i]; 26db8a88feSMichael Jones // if i < count, then end must have been found, so copy end into dest and 27db8a88feSMichael Jones // return the byte after. 28db8a88feSMichael Jones if (i < count) { 29*1c92911eSMichael Jones uc_dest[i] = uc_src[i]; 30*1c92911eSMichael Jones return uc_dest + i + 1; 31db8a88feSMichael Jones } 32db8a88feSMichael Jones return nullptr; 33db8a88feSMichael Jones } 34db8a88feSMichael Jones 35db8a88feSMichael Jones } // namespace __llvm_libc 36