Date: Wed, 09 Oct 2002 14:30:29 -0400 (EDT) From: John Baldwin <jhb@FreeBSD.org> To: Andrew Gallatin <gallatin@cs.duke.edu> Cc: Peter Wemm <peter@wemm.org>, freebsd-arch@FreeBSD.org Subject: Re: lp64 vs lp32 printf Message-ID: <XFMail.20021009143029.jhb@FreeBSD.org> In-Reply-To: <15780.28996.936657.152472@grasshopper.cs.duke.edu>
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On 09-Oct-2002 Andrew Gallatin wrote:
>
> John Baldwin writes:
> >
> > On 09-Oct-2002 Andrew Gallatin wrote:
> > >
> > > Peter Wemm writes:
> > > > >
> > > > > Um, using intmax_t to print size_t's would be incorrect, since it is
> > > > > signed. Using uintmax_t would be bloat. Very few typedefed types
> > > > > need the full bloat of [u]intmax_t, and size_t is unlikely to become
> > > > > one of them before casting it to uintmax_t to print it becomes a style
> > > > > bug in the kernel too (when %z is implemented).
> > > >
> > > > Bring it on! The sooner %z gets here the better. The only problem is that
> > > > gcc has been taught that %z means something different in the kernel. :-(
> > >
> > > Where is gcc taught these things? Can we update it?
> >
> > We should be able to change the kernel %z to some other weird letter.
>
> Sure.. but do you know where in the sources %z is defined to be
> something weird?
sys/kern/subr_prf.c in the kernel, and in the -fformat-extensions local
patches stuff for gcc. I think the gcc work wouldn't be too difficult
to do since it would just be renaming a letter. Hmm, I was incorrect
(my grep re was busted) and %z is actually used in two places in ddb.
We can either pick a letter to use or just use %x with explicit signs
in those two cases:
ddb/db_examine.c: db_printf("%-*lz", width, (long)value);
ddb/db_examine.c: db_printf("%8lz", (long)addr);
Hmm, the second case doesn't even use a sign so it can be %x anyways.
--
John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/
"Power Users Use the Power to Serve!" - http://www.FreeBSD.org/
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