/**
 * Copyright (c) 2021-2022 Huawei Device Co., Ltd.
 * 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 "os/error.h"

#include <array>
#include <cstring>
#include <iosfwd>
#include <string>
#include <variant>

namespace panda::os {

std::string Error::ToString() const
{
    constexpr size_t BUFSIZE = 256;

    if (std::holds_alternative<std::string>(err_)) {
        return std::get<std::string>(err_);
    }

    int err = std::get<int>(err_);

#if (!_GNU_SOURCE && (_POSIX_C_SOURCE >= 200112L || _XOPEN_SOURCE >= 600)) || PANDA_TARGET_MOBILE || \
    PANDA_TARGET_MACOS || PANDA_TARGET_IOS || defined(__MUSL__)
    std::string res;
    res.resize(BUFSIZE);
    strerror_r(err, res.data(), res.size());
#else
    std::array<char, BUFSIZE> buf {};
    std::string res = strerror_r(err, buf.data(), buf.size());
#endif
    return res;
}

}  // namespace panda::os