libc/src/string/strnlen.cpp

   1 //===-- Implementation of strnlen------------------------------------------===//
   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/strnlen.h"
  10 #include "src/__support/macros/config.h"
  11 #include "src/string/string_utils.h"
  12
  13 #include "src/__support/common.h"
  14 #include <stddef.h>
  15
  16 namespace LIBC_NAMESPACE_DECL {
  17
  18 LLVM_LIBC_FUNCTION(size_t, strnlen, (const char *src, size_t n)) {
  19   const void *temp = internal::find_first_character(
  20       reinterpret_cast<const unsigned char *>(src), '\0', n);
  21   return temp ? reinterpret_cast<const char *>(temp) - src : n;
  22 }
  23
  24 } // namespace LIBC_NAMESPACE_DECL