Is there a way to use vsnprintf_l? Would it possibly be considered for an addition one day, if missing?

[Florian Weimer]

* Adhemerval Zanella via Libc-help:

> If the idea is to provide a concise support for printf_l family function,
> I think we should add not only snprintf_l or vsnprintf_l, but rather all the 
> stdio functions for both printf *and* scanf along with the wchar_t family
> as well.  It means to add support for:
>
>   int fprintf_l (FILE *, locale_t, const char *, ...)
>   int fscanf_l (FILE * , locale_t, const char *, ...)
>   int printf_l (locale_t, const char *, ...)
>   int scanf_l (locale_t, const char *, ...)
>   int sprintf_l (char *, locale_t, const char * , ...)
>   int sscanf_l (const char *, locale_t, const char * , ...)
>   int vfprintf_l (FILE *, locale_t, const char * , __va_list)
>   int vprintf_l (locale_t, const char *, __va_list)
>   int vsprintf_l (char * , locale_t, const char *, __va_list);
>   int snprintf_l (char *, size_t, locale_t, const char * , ...)
>   int vfscanf_l (FILE * , locale_t, const char * , __va_list)
>   int vscanf_l (locale_t, const char *, __va_list)
>   int vsnprintf_l (char *, size_t, locale_t, const char *, va_list)
>   int vsscanf_l (const char *, locale_t, const char *, va_list);
>   int dprintf_l (int, locale_t, const char *, ...)
>   int vdprintf_l (int, locale_t, const char *, __va_list)
>   int asprintf_l (char **, locale_t, const char *, ...)
>   int vasprintf_l (char **, locale_t, const char *, __va_list)
>
>   int fwprintf_l (FILE *, locale_t, const wchar_t *, ...)
>   int fwscanf_l (FILE * , locale_t, const wchar_t *, ...)
>   int wprintf_l (locale_t, const wchar_t *, ...)
>   int wscanf_l (locale_t, const wchar_t *, ...)
>   int wsprintf_l (char *, locale_t, const wchar_t * , ...)
>   int swscanf_l (const char *, locale_t, const wchar_t * , ...)
>   int vfwprintf_l (FILE *, locale_t, const wchar_t * , __va_list)
>   int vwprintf_l (locale_t, const wchar_t *, __va_list)
>   int vswprintf_l (wchar_t * , locale_t, const wchar_t *, __va_list);
>   int snwprintf_l (wchar_t *, size_t, locale_t, const wchar_t * , ...)
>   int vfwscanf_l (FILE * , locale_t, const wchar_t * , __va_list)
>   int vwscanf_l (locale_t, const char *, __va_list)
>   int vsnwprintf_l (wchar_t *, size_t, locale_t, const wchar_t *, va_list)
>   int vswscanf_l (const wchar_t *, locale_t, const wchar_t *, va_list);
>   int dwprintf_l (int, locale_t, const wchar_t *, ...)
>   int vdwprintf_l (int, locale_t, const wchar_t *, __va_list)
>   int aswprintf_l (wchar_t **, locale_t, const wchar_t *, ...)
>   int vaswprintf_l (wchar_t **, locale_t, const wchar_t *, __va_list)

Not sure how you generated this list.  swprintf already behaves like
snprintf, so there is no need for a separate “n” variant.  A
wide-character version of dprintf seems unlikely to be implemented
anytime soon.

You did not list the fortify variants of these functions.

I would prefer to wait for standardization: it is not quite clear what
should happen if you use fwprintf_l on a wide stream that already uses a
different charset.

Thanks,
Florian
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