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