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Date: Mon, 19 Sep 2022 19:59:52 +0200
From: Szabolcs Nagy <>
To: Rich Felker <>
Cc: Jₑₙₛ Gustedt <>,
Subject: Re: [PATCH] vfprintf: support C2x %b and %B conversion

* Rich Felker <> [2022-09-19 11:09:17 -0400]:
> On Mon, Sep 12, 2022 at 04:42:51PM +0200, Jₑₙₛ Gustedt wrote:
> > There is one big addition, though, for the decimal floating point
> > types, but support here is optional. I don't know if there is already
> > an open stand-alone implementation of that stuff, but I think that
> > that should be the goal, instead of repeating the effort for every C
> > library implementation that is out there.
> What do these entail? It looks like there's a requirement for printf
> to support them, so I don't see how you'd do that as a separate
> library. It looks like __STDC_IEC_60559_DFP__ is optional though, so
> maybe we could just decline to define it and leave the support
> sporadic at the level the compiler supports, as an extension rather
> than part of the standard-specified functionality?

it seems there is
using glibc specific apis (register_printf_specifier)

i'm not sure how musl can handle this internally since
we dont know in advance if the user links against libdfp.

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