Function wstr_to_utf8

3rdparty/openal/common/strutils.cpp:13–26

#include <windows.h>

std::string wstr_to_utf8(const WCHAR *wstr)
{
    std::string ret;

    int len = WideCharToMultiByte(CP_UTF8, 0, wstr, -1, nullptr, 0, nullptr, nullptr);
    if(len > 0)
    {
        ret.resize(len);
        WideCharToMultiByte(CP_UTF8, 0, wstr, -1, &ret[0], len, nullptr, nullptr);
        ret.pop_back();
    }

    return ret;
}

std::wstring utf8_to_wstr(const char *str)
{