GNU bug report logs - #8545
issues with recent doprnt-related changes

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Package: emacs;

Reported by: Paul Eggert <eggert <at> cs.ucla.edu>

Date: Mon, 25 Apr 2011 05:48:01 UTC

Severity: normal

Done: Eli Zaretskii <eliz <at> gnu.org>

Bug is archived. No further changes may be made.

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From: Juanma Barranquero <lekktu <at> gmail.com>
To: Paul Eggert <eggert <at> cs.ucla.edu>
Cc: Eli Zaretskii <eliz <at> gnu.org>, 8545 <at> debbugs.gnu.org
Subject: bug#8545: issues with recent doprnt-related changes
Date: Thu, 28 Apr 2011 03:32:23 +0200

On Thu, Apr 28, 2011 at 01:51, Paul Eggert <eggert <at> cs.ucla.edu> wrote:

> If fmt is actually greater than format_end, it's pointing past the end
> of an object, so the C code is relying on undefined behavior and the
> check therefore isn't portable.

I'm no expert on the C standard, but would it be undefined behavior,
as long as the pointer has not been dereferenced? A cursory look
suggests that fmt == format_end + 1 is possible, but fmt is not
dereferenced in that case.

    Juanma
This bug report was last modified 4 years and 251 days ago.

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