/*

 * Copyright (C) 2020 The Android Open Source Project

 *

 * 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

 *

 *      http://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 "liblog_symbols.h"

#if defined(__ANDROID_SDK_VERSION__) && (__ANDROID_SDK_VERSION__ <= 29)

#define USE_DLSYM

#endif

#ifdef USE_DLSYM

#include <dlfcn.h>

#endif

namespace android {

namespace base {

#ifdef USE_DLSYM

const std::optional<LibLogFunctions>& GetLibLogFunctions() {

  static std::optional<LibLogFunctions> liblog_functions = []() -> std::optional<LibLogFunctions> {

    void* liblog_handle = dlopen("liblog.so", RTLD_NOW);

    if (liblog_handle == nullptr) {

      return {};

    }

    LibLogFunctions real_liblog_functions = {};

#define DLSYM(name)                                                                   \

  real_liblog_functions.name =                                                        \

      reinterpret_cast<decltype(LibLogFunctions::name)>(dlsym(liblog_handle, #name)); \

  if (real_liblog_functions.name == nullptr) {                                        \

    return {};                                                                        \

  }

    DLSYM(__android_log_set_logger)

    DLSYM(__android_log_write_log_message)

    DLSYM(__android_log_logd_logger)

    DLSYM(__android_log_stderr_logger)

    DLSYM(__android_log_set_aborter)

    DLSYM(__android_log_call_aborter)

    DLSYM(__android_log_default_aborter)

    DLSYM(__android_log_set_minimum_priority);

    DLSYM(__android_log_get_minimum_priority);

    DLSYM(__android_log_set_default_tag);

#undef DLSYM

    return real_liblog_functions;

  }();

  return liblog_functions;

}

#else

const std::optional<LibLogFunctions>& GetLibLogFunctions() {

  static std::optional<LibLogFunctions> liblog_functions = []() -> std::optional<LibLogFunctions> {

    return LibLogFunctions{

        .__android_log_set_logger = __android_log_set_logger,

        .__android_log_write_log_message = __android_log_write_log_message,

        .__android_log_logd_logger = __android_log_logd_logger,

        .__android_log_stderr_logger = __android_log_stderr_logger,

        .__android_log_set_aborter = __android_log_set_aborter,

        .__android_log_call_aborter = __android_log_call_aborter,

        .__android_log_default_aborter = __android_log_default_aborter,

        .__android_log_set_minimum_priority = __android_log_set_minimum_priority,

        .__android_log_get_minimum_priority = __android_log_get_minimum_priority,

        .__android_log_set_default_tag = __android_log_set_default_tag,

    };

  }();

  return liblog_functions;

}

#endif

}  // namespace base

}  // namespace android