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Re: [wg14/wg21 liaison] Draft paper proposing new wording for C's fopen('x') and fopen('a')

From: Aaron Ballman <aaron_at_[hidden]>
Date: Tue, 5 Oct 2021 10:02:37 -0400
On Tue, Oct 5, 2021 at 9:56 AM Niall Douglas <s_sourceforge_at_[hidden]> wrote:
> WG21 LEWG, WG14,
> CC: Aaron, if he could get me a WG14 paper number that would be great.

I've requested the document number from the WG14 secretary.


> Please find attached a draft paper proposing improved normative wording
> for C2x's fopen('x') and fopen('a'), which is relevant to the C++ 23 IS
> as iostreams would replicate C2x's semantics here. The main change is to
> require atomicity, and to remove exclusivity allowing implementations to
> silently destroy and corrupt data.
> All implementations reviewed implement the proposed wording already if
> they implement it at all, except atomic fopen('a') in Microsoft's UCRT
> which does not for no good reason I can ascertain. I'd normally bug
> Billy about this, but he's moved to vcpkg, so if a Microsoft CRT
> maintainer could give feedback on the viability of fixing their
> fopen('a') implementation as per the instructions in the paper that
> would be great.
> Comments and suggestions for the draft are welcome. Note that WG14 needs
> the final paper in the next week, so don't wait if you have something to
> say.
> Thanks,
> Niall

Received on 2021-10-05 09:03:00