//

//  Copyright 2019 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/flags/internal/program_name.h"

#include <string>

#include "absl/base/attributes.h"

#include "absl/base/config.h"

#include "absl/base/no_destructor.h"

#include "absl/base/thread_annotations.h"

#include "absl/flags/internal/path_util.h"

#include "absl/strings/string_view.h"

#include "absl/synchronization/mutex.h"

namespace absl {

ABSL_NAMESPACE_BEGIN

namespace flags_internal {

static absl::Mutex& ProgramNameMutex() {

  static absl::NoDestructor<absl::Mutex> mutex;

  return *mutex;

}

ABSL_CONST_INIT static std::string* program_name ABSL_GUARDED_BY(

    ProgramNameMutex()) ABSL_PT_GUARDED_BY(ProgramNameMutex()) = nullptr;

std::string ProgramInvocationName() {

  absl::MutexLock l(ProgramNameMutex());

  return program_name ? *program_name : "UNKNOWN";

}

std::string ShortProgramInvocationName() {

  absl::MutexLock l(ProgramNameMutex());

  return program_name ? std::string(flags_internal::Basename(*program_name))

                      : "UNKNOWN";

}

void SetProgramInvocationName(absl::string_view prog_name_str) {

  absl::MutexLock l(ProgramNameMutex());

  if (!program_name) {

    program_name = new std::string(prog_name_str);

  } else {

    program_name->assign(prog_name_str.data(), prog_name_str.size());

  }

}

}  // namespace flags_internal

ABSL_NAMESPACE_END

}  // namespace absl