[Bug stdio/30257] *printf of %lc with null argument should not produce a NUL byte

["bruno at clisp dot org" <sourceware-bugzilla@sourceware.org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=30257

Bruno Haible <bruno at clisp dot org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |NOTABUG
             Status|UNCONFIRMED                 |RESOLVED

--- Comment #3 from Bruno Haible <bruno at clisp dot org> ---
This issue was submitted in the ISO C 23 ballot as GB-141,
and in the meeting from 2023-06-20 to 2023-06-23 it was decided upon:
<https://www.open-std.org/JTC1/sc22/wg14/www/docs/n3167.pdf>
page 23, 24. The decision ("option 1") is detailed in
<https://www.open-std.org/JTC1/sc22/wg14/www/docs/n3148.doc>:
  "Option 1 (require a NUL) - change the text to:
   If an l length modifier is present, the wint_t argument is converted
   as if by a call to the wcrtomb function with a pointer to storage of
   at least MB_CUR_MAX bytes, the wint_t argument converted to wchar_t,
   and an initial shift state."

So, ISO C changed, and POSIX will follow suit.

The glibc behaviour is thus now ISO C compliant. Not a bug any more.

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