Error.cpp

/*
 * Copyright (c) 2023, Liav A. <liavalb@hotmail.co.il>
 * Copyright (c) 2023, Cameron Youell <cameronyouell@gmail.com>
 * Copyright (c) 2024, stasoid <stasoid@yahoo.com>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 */

#include <AK/Error.h>
#ifdef AK_OS_WINDOWS
#    include <AK/ByteString.h>
#    include <AK/HashMap.h>
#    include <windows.h>
#endif

namespace AK {

Error Error::from_string_view_or_print_error_and_return_errno(StringView string_literal, [[maybe_unused]] int code)
{
    return Error::from_string_view(string_literal);
}

#ifdef AK_OS_WINDOWS
Error Error::from_windows_error(DWORD code)
{
    static HashMap<DWORD, ByteString> windows_errors;

    auto string = windows_errors.get(code);
    if (string.has_value()) {
        return Error::from_string_view(string->view());
    } else {
        char* message = nullptr;
        auto size = FormatMessageA(
            FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
            nullptr,
            code,
            MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
            (LPSTR)&message,
            0,
            nullptr);

        if (size == 0)
            return Error::from_string_view_or_print_error_and_return_errno("Unknown error"sv, code);

        windows_errors.set(code, { message, size });
        LocalFree(message);
        return from_windows_error(code);
    }
}
#endif

}