Celestia

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// winutil.cpp
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//
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// Copyright (C) 2019-present, Celestia Development Team
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// Copyright (C) 2002, Chris Laurel <claurel@shatters.net>
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//
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// Miscellaneous useful Windows-related functions.
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of the GNU General Public License
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// as published by the Free Software Foundation; either version 2
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// of the License, or (at your option) any later version.
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#include "winutil.h"
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#include <windows.h>
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namespace celestia::util
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{
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std::string
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WideToUTF8(std::wstring_view ws)
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{
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    if (ws.empty())
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        return {};
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    // get a converted string length
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    const auto srcLen = static_cast<int>(ws.size());
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    int len = WideCharToMultiByte(CP_UTF8, 0, ws.data(), srcLen, nullptr, 0, nullptr, nullptr);
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    if (len <= 0)
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        return {};
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    std::string out(static_cast<std::string::size_type>(len), '\0');
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    len = WideCharToMultiByte(CP_UTF8, 0, ws.data(), srcLen, out.data(), len, nullptr, nullptr);
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    if (len <= 0)
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        return {};
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    out.resize(static_cast<std::size_t>(len));
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    return out;
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}
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} // end namespace celestia::util
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