From: Thomas Klausner <wiz@gatalith.at>
To: Eli Zaretskii <eliz@gnu.org>
Cc: 73307@debbugs.gnu.org, Paul Eggert <eggert@cs.ucla.edu>
Subject: bug#73307: Fix ctype(3) usage
Date: Tue, 17 Sep 2024 13:55:59 +0200 [thread overview]
Message-ID: <ZuluT_k-VE0LgTWK@exadelic.gatalith.at> (raw)
In-Reply-To: <86r09ibiq3.fsf@gnu.org>
On Tue, Sep 17, 2024 at 02:52:20PM +0300, Eli Zaretskii wrote:
> Thanks. However, I'm not sure this is the right fix, the function is
> defined with argument type of 'int'. Paul, any comments?
That is exactly the problem.
If you pass a 'signed char' below -1, it gets converted to the same
integer value, also a negative number below -1, and you end up passing
an invalid argument to the function. The function is defined to only
accept EOF and non-negative values in the range of 'unsigned char'.
-1 is only special because that's usually the value of EOF.
Thomas
next prev parent reply other threads:[~2024-09-17 11:55 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-09-16 21:25 bug#73307: Fix ctype(3) usage Thomas Klausner
2024-09-17 11:52 ` Eli Zaretskii
2024-09-17 11:55 ` Thomas Klausner [this message]
2024-09-18 0:05 ` Paul Eggert
2024-09-18 2:13 ` Po Lu via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-09-18 11:45 ` Eli Zaretskii
2024-09-18 15:18 ` Stefan Monnier via Bug reports for GNU Emacs, the Swiss army knife of text editors
2024-09-18 15:35 ` Paul Eggert
2024-09-18 16:11 ` Eli Zaretskii
2024-09-18 16:22 ` Paul Eggert
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