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Date: Thu, 15 Jun 2017 20:19:29 +0300 (MSK)
From: Alexander Monakov <>
Subject: Re: [PATCH] Handle localtime errors in ctime

On Thu, 15 Jun 2017, Rich Felker wrote:
> > Um, the previous time an opposite direction was taken:
> >
> I found this in POSIX while reviewing the new patch:
> [CX] [Option Start] Upon successful completion, ctime_r() shall return
> a pointer to the string pointed to by buf. When an error is
> encountered, a null pointer shall be returned. [Option End]
> So while ISO C may not have anything to say about it (i.e. it's UB in
> plain C), POSIX does seem to require handling the error. I forgot we'd
> looked at this before but it seems we missed what POSIX had to say.

... even though the quoted POSIX spec specifically mentions ctime_r, not ctime?
(musl implementation of ctime_r does appear to miss that, though)


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