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Date: Tue, 20 Sep 2022 16:22:36 +0200
From: Jₑₙₛ Gustedt <jens.gustedt@...ia.fr>
To: Rich Felker <dalias@...c.org>
Cc: musl@...ts.openwall.com
Subject: Re: [PATCH] vfprintf: support C2x %b and %B conversion
specifiers
Rich,
on Tue, 20 Sep 2022 10:15:18 -0400 you (Rich Felker <dalias@...c.org>)
wrote:
> On Tue, Sep 20, 2022 at 04:08:03PM +0200, Jₑₙₛ Gustedt wrote:
> > Rich,
> >
> > on Tue, 20 Sep 2022 09:55:54 -0400 you (Rich Felker
> > <dalias@...c.org>) wrote:
> >
> > > In general, offering non-portable functionality that applications
> > > can't already generally expect to have on popular systems, with
> > > no way to probe for availability, does not seem useful, and it's
> > > even less useful when there's a trivial portable way to do the
> > > same thing.
> >
> > Unfortunately, for the the bit-precise types there isn't. The
> > supported types may be wider than `long long` (128 and even 256 will
> > be common values that will probably widely supported) and then the
> > task of printing them gets as nasty as for today's `__int128`. My
> > hope was really to get all of these done for once, such that our
> > users may use their creativity to do more useful stuff.
>
> Well how are programmers supposed to probe what's available, and what
> are they supposed to do as fallback when support is not available? And
> what is the upper limit?
There is a feature test macro for the maximum width of bit-precise
integers, `BITINT_MAXWIDTH`. It is guaranteed to be at least
`ULLONG_WIDTH` but can (and will) be larger on many platforms.
Jₑₙₛ
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