Re: *printf-posix: ISO C 23: Add %b directive for binary output of integers

[Eric Blake]

On Sat, Mar 18, 2023 at 11:50:47AM +0000, Pádraig Brady wrote:
> On 17/03/2023 21:51, Bruno Haible wrote:
> > This set of patches adds support for the %b format string directive, 
> > required
> > by ISO C 23, to the *printf family of functions.
> > 
> > So far, only glibc implements it (since version 2.35). For portability to 
> > the
> > other platforms, use the *printf-posix modules.
> 
> For my reference mainly...
> 
> It's interesting that this conflicts with the POSIX specified %b directive
> for the printf(1) utility.

Another consideration: C23 admits that %#B is not available for
portable use of outputting uppercase '0B...', you would have to
manually write 0B%b instead.  However, since glibc DOES support %B as
the uppercase counterpart to %b, should we add that in gnulib (but
this time under the auspices of *printf-gnu, rather than
*printf-posix)?

-- 
Eric Blake, Principal Software Engineer
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