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From: Taylor Blau <me@ttaylorr.com>
To: Junio C Hamano <gitster@pobox.com>
Cc: Michael J Gruber <git@grubix.eu>, git@vger.kernel.org
Subject: Re: [PATCH 1/2] dir.c: avoid gcc warning
Date: Mon, 9 May 2022 11:58:21 -0400	[thread overview]
Message-ID: <Ynk6HdsPqYH9Np92@nand.local> (raw)
In-Reply-To: <xmqqy1zejtte.fsf@gitster.g>

On Fri, May 06, 2022 at 01:21:33PM -0700, Junio C Hamano wrote:
> Michael J Gruber <git@grubix.eu> writes:
>
> > Related to -Wstringop-overread.
> >
> > In fact, this may be a false positive, but reading until the correct end
> > is desirable here anyways.
>
> But the correct end is start + (end - start), not start + (end -
> start + 1), isn't it?  We've stripped trailing junk like /.git and
> end is point at one byte beyond the end of URL to the repository.
>
> E.g. for "https://auth@host/", we have advanced start to point at
> "h" at the beginning of "host", and we have moved end back from
> pointing at the NUL at the end to point at "/" at the end of
> "host/".
>
> We are trying to make sure that the resulting "host" string between
> start and end do not have a slash to apply this special case.
>
> If the original URL were "https://auth@host:4321/", the end points
> at "/" at the end of "host:4321/", making the string to be checked
> to "host:4321" and we are trying to see it has no '/' in it (which
> is the case).  By extending the string by one, memchr() will see the
> '/' at the end that is outside.
>
> This seems to be a behaviour breaking change and I am not sure what
> we are trying to achieve with it.  Is this a suggestion made by a
> broken compiler you have, or something?

I agree with this reasoning; the change here does not seem correct to
me, and the original version looks to be doing what it advertises.

Thanks,
Taylor

  reply	other threads:[~2022-05-09 16:00 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-05-06 18:04 [PATCH 0/2] quell a few gcc warnings Michael J Gruber
2022-05-06 18:04 ` [PATCH 1/2] dir.c: avoid gcc warning Michael J Gruber
2022-05-06 20:21   ` Junio C Hamano
2022-05-09 15:58     ` Taylor Blau [this message]
2022-05-07  6:14   ` Carlo Marcelo Arenas Belón
2022-05-06 18:04 ` [PATCH 2/2] http.c: " Michael J Gruber
2022-05-06 20:22   ` Junio C Hamano
2022-05-06 21:17     ` [PATCH] http.c: clear the 'finished' member once we are done with it Junio C Hamano
2022-05-07  5:40       ` Carlo Marcelo Arenas Belón
2022-05-07 18:42         ` Junio C Hamano
2022-05-07 19:11           ` Carlo Arenas
2022-05-23 21:58       ` Johannes Schindelin
2022-05-23 22:58         ` Junio C Hamano
2022-05-23 23:36           ` Junio C Hamano
2022-05-23 23:41           ` Johannes Schindelin
2022-05-24  0:02             ` Junio C Hamano
2022-05-24  6:31               ` Daniel Stenberg
2022-05-24 10:57                 ` Johannes Schindelin
2022-05-24 17:45                 ` Junio C Hamano
2022-05-26 14:15                   ` Daniel Stenberg
2022-05-24 11:03               ` Johannes Schindelin
2022-05-24 17:15                 ` Junio C Hamano
2022-05-24 20:16                   ` Carlo Marcelo Arenas Belón
2022-05-24 20:45                     ` Ævar Arnfjörð Bjarmason
2022-05-24 22:34                       ` Junio C Hamano
2022-05-25  9:08                         ` Michael J Gruber
2022-05-25 13:27                         ` Ævar Arnfjörð Bjarmason
2022-05-24 22:16                     ` Junio C Hamano
2022-05-24 23:19                     ` Junio C Hamano
2022-05-25  2:02                       ` Carlo Arenas
2022-05-24 20:38                   ` Ævar Arnfjörð Bjarmason
2022-05-24 22:28                     ` Junio C Hamano
2022-05-25 10:07                       ` Johannes Schindelin
2022-05-25 16:40                         ` Junio C Hamano
2022-05-06 20:41   ` [PATCH 2/2] http.c: avoid gcc warning Carlo Marcelo Arenas Belón
2022-05-09 11:22 ` [PATCH] detect-compiler: make detection independent of locale Michael J Gruber
2022-05-09 15:52   ` Junio C Hamano
2022-05-09 15:59     ` rsbecker

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