Date: Thu, 15 Jun 2017 20:19:29 +0300 (MSK) From: Alexander Monakov <amonakov@...ras.ru> To: musl@...ts.openwall.com 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: > > http://www.openwall.com/lists/musl/2014/09/05/17 > > 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) Alexander
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