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From: Andreas Schwab <schwab@suse.de>
To: Zack Weinberg <zackw@panix.com>
Cc: Florian Weimer <fweimer@redhat.com>,  GNU C Library <libc-alpha@sourceware.org>
Subject: Re: [review] manual: Clarify strnlen, wcsnlen, strndup null termination behavior
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Date: Wed, 30 Oct 2019 16:47:00 -0000
In-Reply-To: <CAKCAbMgYPSGZOCDX_qqmt8_DxxRWuqiEZg9OJJEEirOHSv-8+g@mail.gmail.com>
	(Zack Weinberg's message of "Wed, 30 Oct 2019 12:30:51 -0400")
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On Okt 30 2019, Zack Weinberg wrote:

> On Wed, Oct 30, 2019 at 12:20 PM Andreas Schwab <schwab@suse.de> wrote:
>> On Okt 30 2019, Zack Weinberg wrote:
>>
>> > It says that accesses beyond maxlen are forbidden, but it *doesn't*
>> > say that accesses beyond the first NUL are forbidden; therefore they
>> > are allowed.
>>
>> Neither does it say that about strncpy or strncat.
>
> I don't see why that would change anything.

That means that strncpy (x, "a", 10) is undefined.

Andreas.

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Andreas Schwab, SUSE Labs, schwab@suse.de
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