libc/src/string/strlen.cpp

   1 //===-- Implementation of strlen ------------------------------------------===//
   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/strlen.h"
  10
  11 #include "src/__support/common.h"
  12
  13 namespace __llvm_libc {
  14
  15 // TODO: investigate the performance of this function.
  16 // There might be potential for compiler optimization.
  17 size_t LLVM_LIBC_ENTRYPOINT(strlen)(const char *src) {
  18   const char *end = src;
  19   while (*end != '\0')
  20     ++end;
  21   return end - src;
  22 }
  23
  24 } // namespace __llvm_libc