libc/src/string/strcmp.cpp

   1 //===-- Implementation of strcmp ------------------------------------------===//
   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/strcmp.h"
  10
  11 #include "src/__support/common.h"
  12
  13 namespace __llvm_libc {
  14
  15 // TODO: Look at benefits for comparing words at a time.
  16 int LLVM_LIBC_ENTRYPOINT(strcmp)(const char *left, const char *right) {
  17   for (; *left && *left == *right; ++left, ++right)
  18     ;
  19   return *reinterpret_cast<const unsigned char *>(left) -
  20          *reinterpret_cast<const unsigned char *>(right);
  21 }
  22
  23 } // namespace __llvm_libc