core dump from within asctime_r()

[Tony Finch]

On Sat, 30 Jan 2010, Robert Elz wrote:
>
> ctime() is (of course) just asctime(locatime(t))
>
> locatime() can return NULL these days, and given a nonsense time
> value (which is quite likely under these circumstances), probably did,
> but asctime() doesn't expect anything but a valus "struct tm *" and will
> simply dereference NULL is NULL is returned from localtime() - instant core.

This code follows the C standard, so this bug is a defect in the standard.
It has not been corrected in the latest committee draft.
http://www.open-std.org/JTC1/SC22/WG14/www/docs/n1425.pdf

Tony.
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