[perl #132145] POSIX::localtime not identical to CORE::localtime

On Sun, 24 Sep 2017 18:17:07 GMT, jkeenan wrote:
> On Fri, 22 Sep 2017 21:13:47 GMT, slaven@rezic.de wrote:
> >
> > This is a bug report for perl from slaven@rezic.de,
> > generated with the help of perlbug 1.40 running under perl 5.27.4.
> >
> >
> > -----------------------------------------------------------------
> > The POSIX Pod says for localtime:
> >
> > This is identical to Perl's builtin "localtime()" function for
> > converting seconds since the epoch to a date see "localtime" in
> > perlfunc.
> >
> > However, it is only identical if the optional argument is given ---
> > POSIX::localtime fails if the argument is missing:
> >
> > $ perl5.27.4 -MPOSIX -e 'warn localtime(time); warn
> > POSIX::localtime(time)'
> > 5982322811752641 at -e line 1.
> > 5982322811752641 at -e line 1.
> >
> > $ perl5.27.4 -MPOSIX -e 'warn localtime(); warn POSIX::localtime()'
> > 2292322811752641 at -e line 1.
> > Usage: POSIX::localtime(time) at -e line 1.
> >
> > This seems to be the case since 5.8.x, at least (checked with 5.8.8).
> >
> > I would expect that the documentation is adjusted, or that
> > POSIX::localtime
> > may deal with a missing argument.
> >
> >
> 
> This is a problem more general than simply POSIX::localtime().  I
> suspect it affects all POSIX::*() functions which claim to be
> identical to the Perl builtins of the same name and which, in core,
> work with an implicit $_.  The POSIX::* functions appear to require an
> explicit argument.
> 
> This makes sense to me because the POSIX specifications don't have the
> equivalent of our topic variable.
> 
> I grepped the CPAN POSIX documentation for those functions which are
> claimed to work the same in both places.  See attachment 132145-posix-
> identical-to-perl.txt.
> 
> I then began to write a test file comparing the builtins and the POSIX
> variants, with and without explicit arguments.  See attachment 132145-
> core-vs-posix.t.  (This test file should be extended to all functions
> named in the other attachment.)
> 
> I think that we should simply change the documentation as needed to
> indicate this one difference in behaviour between builtins and POSIX.
> 
> Thank you very much.

Partially done in commit bda53d3ed47d5776c4a1b88c0b7cfb484f5644be.

-- 
James E Keenan (jkeenan@cpan.org)

---
via perlbug:  queue: perl5 status: open
https://rt.perl.org/Ticket/Display.html?id=132145

• [perl #132145] POSIX::localtime not identical to CORE::localtime by James E Keenan via RT