// Copyright 2017 The Abseil Authors.

//

// Licensed under the Apache License, Version 2.0 (the "License");

// you may not use this file except in compliance with the License.

// You may obtain a copy of the License at

//

//      https://www.apache.org/licenses/LICENSE-2.0

//

// Unless required by applicable law or agreed to in writing, software

// distributed under the License is distributed on an "AS IS" BASIS,

// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

// See the License for the specific language governing permissions and

// limitations under the License.

#include "absl/strings/internal/memutil.h"

#include <cstdlib>

#include "absl/strings/ascii.h"

namespace absl {

ABSL_NAMESPACE_BEGIN

namespace strings_internal {

int memcasecmp(const char* s1, const char* s2, size_t len) {

  const unsigned char* us1 = reinterpret_cast<const unsigned char*>(s1);

  const unsigned char* us2 = reinterpret_cast<const unsigned char*>(s2);

  for (size_t i = 0; i < len; i++) {

    const int diff =

        int{static_cast<unsigned char>(absl::ascii_tolower(us1[i]))} -

        int{static_cast<unsigned char>(absl::ascii_tolower(us2[i]))};

    if (diff != 0) return diff;

  }

  return 0;

}

}  // namespace strings_internal

ABSL_NAMESPACE_END

}  // namespace absl