int _wprintf(const wchar_t* format, ...)
{
  int r;
  static int utf8ModeSet = 0;
  static wchar_t* bufWchar = NULL;
  static size_t bufWcharCount = 256;
  static char* bufMchar = NULL;
  static size_t bufMcharCount = 256;
  va_list vl;
  int mcharCount = 0;

  if (utf8ModeSet == 0)
  {
    if (!SetConsoleOutputCP(CP_UTF8))
    {
      DWORD err = GetLastError();
      fprintf(stderr, "SetConsoleOutputCP(CP_UTF8) failed with error 0x%Xn", err);
      utf8ModeSet = -1;
    }
    else
    {
      utf8ModeSet = 1;
    }
  }

  if (utf8ModeSet != 1)
  {
    va_start(vl, format);
    r = vwprintf(format, vl);
    va_end(vl);
    return r;
  }

  if (bufWchar == NULL)
  {
    if ((bufWchar = malloc(bufWcharCount * sizeof(wchar_t))) == NULL)
    {
      return -1;
    }
  }

  for (;;)
  {
    va_start(vl, format);
    r = vswprintf(bufWchar, bufWcharCount, format, vl);
    va_end(vl);

    if (r < 0)
    {
      break;
    }

    if (r + 2 <= bufWcharCount)
    {
      break;
    }

    free(bufWchar);
    if ((bufWchar = malloc(bufWcharCount * sizeof(wchar_t) * 2)) == NULL)
    {
      return -1;
    }
    bufWcharCount *= 2;
  }

  if (r > 0)
  {
    if (bufMchar == NULL)
    {
      if ((bufMchar = malloc(bufMcharCount)) == NULL)
      {
        return -1;
      }
    }

    for (;;)
    {
      mcharCount = WideCharToMultiByte(CP_UTF8,
                                       0,
                                       bufWchar,
                                       -1,
                                       bufMchar,
                                       bufMcharCount,
                                       NULL,
                                       NULL);
      if (mcharCount > 0)
      {
        break;
      }

      if (GetLastError() != ERROR_INSUFFICIENT_BUFFER)
      {
        return -1;
      }

      free(bufMchar);
      if ((bufMchar = malloc(bufMcharCount * 2)) == NULL)
      {
        return -1;
      }
      bufMcharCount *= 2;
    }
  }

  if (mcharCount > 1)
  {
    DWORD numberOfCharsWritten, consoleMode;

    if (GetConsoleMode(GetStdHandle(STD_OUTPUT_HANDLE), &consoleMode))
    {
      fflush(stdout);
      if (!WriteConsoleA(GetStdHandle(STD_OUTPUT_HANDLE),
                         bufMchar,
                         mcharCount - 1,
                         &numberOfCharsWritten,
                         NULL))
      {
        return -1;
      }
    }
    else
    {
      if (fputs(bufMchar, stdout) == EOF)
      {
        return -1;
      }
    }
  }

  return r;
}

_wprintf(L"xA0xA1xA2xA3xA4xA5xA6xA7"
         L"xA8xA9xAAxABxACxADxAExAF"
         L"xB0xB1xB2xB3xB4xB5xB6xB7"
         L"xB8xB9xBAxBBxBCxBDxBExBF"
         L"n"
         L"xC0xC1xC2xC3xC4xC5xC6xC7"
         L"xC8xC9xCAxCBxCCxCDxCExCF"
         L"xD0xD1xD2xD3xD4xD5xD6xD7"
         L"xD8xD9xDAxDBxDCxDDxDExDF"
         L"n"
         L"xE0xE1xE2xE3xE4xE5xE6xE7"
         L"xE8xE9xEAxEBxECxEDxEExEF"
         L"xF0xF1xF2xF3xF4xF5xF6xF7"
         L"xF8xF9xFAxFBxFCxFDxFExFF"
         L"n");

_wprintf(L"x391x392x393x394x395x396x397"
         L"x398x399x39Ax39Bx39Cx39Dx39Ex39F"
         L"x3A0x3A1x3A2x3A3x3A4x3A5x3A6x3A7"
         L"x3A8x3A9x3AAx3ABx3ACx3ADx3AEx3AFx3B0"
         L"n"
         L"x3B1x3B2x3B3x3B4x3B5x3B6x3B7"
         L"x3B8x3B9x3BAx3BBx3BCx3BDx3BEx3BF"
         L"x3C0x3C1x3C2x3C3x3C4x3C5x3C6x3C7"
         L"x3C8x3C9x3CAx3CBx3CCx3CDx3CE"
         L"n");

_wprintf(L"x410x411x412x413x414x415x401x416x417"
         L"x418x419x41Ax41Bx41Cx41Dx41Ex41F"
         L"x420x421x422x423x424x425x426x427"
         L"x428x429x42Ax42Bx42Cx42Dx42Ex42F"
         L"n"
         L"x430x431x432x433x434x435x451x436x437"
         L"x438x439x43Ax43Bx43Cx43Dx43Ex43F"
         L"x440x441x442x443x444x445x446x447"
         L"x448x449x44Ax44Bx44Cx44Dx44Ex44F"
         L"n");

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printf("my name is Sexe9nn");