1 //===-- Implementation of memchr ------------------------------------------===//
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/memchr.h"
10 #include "src/__support/common.h"
11 #include <stddef.h>
12 
13 namespace __llvm_libc {
14 
15 // TODO: Look at performance benefits of comparing words.
16 void *LLVM_LIBC_ENTRYPOINT(memchr)(const void *src, int c, size_t n) {
17   const unsigned char *str = reinterpret_cast<const unsigned char *>(src);
18   const unsigned char ch = c;
19   for (; n && *str != ch; --n, ++str)
20     ;
21   return n ? const_cast<unsigned char *>(str) : nullptr;
22 }
23 
24 } // namespace __llvm_libc
25