string_convert(
    vimconv_T	*vcp,
    char_u	*ptr,
    int		*lenp)
{
    return string_convert_ext(vcp, ptr, lenp, NULL);
}
string_convert(
    vimconv_T	*vcp,
    char_u	*ptr,
    int		*lenp)
{
    return string_convert_ext(vcp, ptr, lenp, NULL);
}