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Message-ID: <ymigejkdbyrxohd5chrigpfvztnia2nw4u3jmdiw6vke2xs3me@xb5t6hevzuba>
Date: Sat, 5 Jul 2025 01:31:22 +0200
From: Alejandro Colomar <alx@...nel.org>
To: Eric Blake <eblake@...hat.com>
Cc: Rich Felker <dalias@...c.org>, enh <enh@...gle.com>,
Florian Weimer <fweimer@...hat.com>, Adhemerval Zanella Netto <adhemerval.zanella@...aro.org>,
musl@...ts.openwall.com, libc-alpha@...rceware.org, Joseph Myers <josmyers@...hat.com>,
наб <nabijaczleweli@...ijaczleweli.xyz>, Paul Eggert <eggert@...ucla.edu>,
Robert Seacord <rcseacord@...il.com>, Bruno Haible <bruno@...sp.org>, bug-gnulib@....org,
JeanHeyd Meneide <phdofthehouse@...il.com>, Thorsten Glaser <tg@...bsd.de>
Subject: Re: Re: BUG: realloc(p,0) should be consistent with malloc(0)
Hi Eric,
On Fri, Jun 20, 2025 at 01:38:14AM +0200, Alejandro Colomar wrote:
> > > - POSIX.1-2001
> >
> > This one defers to C89 anywhere that it is not explicitly documenting
> > with CX shading.
>
> Ahh, I had thought it would defer to C99 because it's older, but I guess
> it's like POSIX.1-2024 that doesn't defer to C23. Thanks! Then I stand
> corrected, and glibc conforms to POSIX.1-2001.
I was reading the memccpy(3) specification in POSIX.1-2004, and found
this:
Issue 6
The restrict keyword is added to the memccpy() prototype
for alignment with the ISO/IEC 9899:1999 standard.
So, Issue 6 aligned with ISO C99? Is this exceptional, or does then
POSIX.1-2001 not defer to ISO C89?
BTW, I was trying to find out the history of memccpy(3), and why it was
introduced in 4.4BSD. Does anyone know the history? I find it a weird
function that doesn't have any good use case, or I don't seem to see it.
Every use case I see, such as a poor-man's strlcpy(3), seems to be prone
to off-by-one errors, or have other APIs that would be more ergonomic.
What were the original uses in 4.4BSD?
Have a lovely day!
Alex
--
<https://www.alejandro-colomar.es/>
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