Openwall GNU/*/Linux - a small security-enhanced Linux distro for servers
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date: Thu, 6 Jul 2017 21:05:12 +0200
From: Bartosz Brachaczek <>
Subject: Re: Documentation of memcpy and undefined behavior in memset

On 7/6/2017 6:23 PM, Rich Felker wrote:
> I think you're correct, at least under a pessimistic interpretation of
> the standard. I can't find where they actually define "modifies", and
> you could argue that assignment of the same value twice "modifies" the
> object at most once, but I don't like relying on that kind of
> ambiguity and it's easy enough to fix just by adding a sequence point.

I don't have a copy of C11, but N1570 reads in a note to 3.1:

> ‘‘Modify’’ includes the case where the new value being stored is the same as the previous value.


Powered by blists - more mailing lists

Your e-mail address:

Confused about mailing lists and their use? Read about mailing lists on Wikipedia and check out these guidelines on proper formatting of your messages.