1 //===-- Implementation of memrchr -----------------------------------------===//
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/memrchr.h"
10 #include "src/__support/common.h"
11 #include <stddef.h>
12 
13 namespace __llvm_libc {
14 
LLVM_LIBC_ENTRYPOINT(memrchr)15 void *LLVM_LIBC_ENTRYPOINT(memrchr)(const void *src, int c, size_t n) {
16   const unsigned char *str = reinterpret_cast<const unsigned char *>(src);
17   const unsigned char ch = c;
18   for (; n != 0; --n) {
19     const unsigned char *s = str + n - 1;
20     if (*s == ch)
21       return const_cast<unsigned char *>(s);
22   }
23   return nullptr;
24 }
25 
26 } // namespace __llvm_libc
27