vfprintf.cpp

template <template <typename, typename> class Base, typename Character>
static int __cdecl common_vfprintf(
    unsigned __int64 const options,
    FILE*            const stream,
    Character const* const format,
    _locale_t        const locale,
    va_list          const arglist
    ) throw()
{
    typedef output_processor<
        Character,
        stream_output_adapter<Character>,
        Base<Character, stream_output_adapter<Character>>
    > processor_type;

    _VALIDATE_RETURN(stream != nullptr, EINVAL, -1);
    _VALIDATE_RETURN(format != nullptr, EINVAL, -1);

    return __acrt_lock_stream_and_call(stream, [&]() -> int
    {
        __acrt_stdio_temporary_buffering_guard const buffering(stream);

        _LocaleUpdate locale_update(locale);
        processor_type processor(
            stream_output_adapter<Character>(stream),
            options,
            format,
            locale_update.GetLocaleT(),
            arglist);

        return processor.process();
    });
}