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Message-ID: <20230529212155.583e2ab7@inria.fr>
Date: Mon, 29 May 2023 21:21:55 +0200
From: Jₑₙₛ Gustedt <jens.gustedt@...ia.fr>
To: Rich Felker <dalias@...c.org>
Cc: musl@...ts.openwall.com
Subject: Re: [C23 printf 2/3] C23: implement the wN length specifiers
for printf
Rich,
on Mon, 29 May 2023 11:46:40 -0400 you (Rich Felker <dalias@...c.org>)
wrote:
> On Mon, May 29, 2023 at 09:14:13AM +0200, Jₑₙₛ Gustedt wrote:
> > Rich,
> >
> > on Fri, 26 May 2023 17:03:58 -0400 you (Rich Felker
> > <dalias@...c.org>) wrote:
> >
> > > I think you need an extra state that's "plain but not bare" that
> > > duplicates only the integer transitions out of it, like the l, ll,
> > > etc. prefix states do.
> >
> > Hm, the problem is that for the other prefixes the table entries
> > then encode the concrete type that is to be expected. We could not
> > do this here because the type depends on the requested width. So we
> > would then need to "repair" that type after the loop. A `switch` to
> > do that would look substantially similar to what is there, now. Do
> > you think that would be better?
>
> OK I think I can communicate better with code than natural language
> text, so here's a diff, completely untested, of what I had in mind.
that's ... ugh ... not so prety, I think
In my current version I track the desired width, if there is w
specifier, and then do the adjustments after the loop. That takes
indeed care of undefined character sequences.
I find that much better readable, and also easier to extend (later
there comes the `wf` case and the `128`, and perhaps some day `256`)
Jₑₙₛ
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