[patch][libcpp] PR53690 - wrong code for C++11 UCN

[Andreas Schwab]

Steven Bosscher <stevenb.gcc@gmail.com> writes:

> In any case, it's valid for C++11. Jason modified charset.c to
> implement the C++11 change and handle the differences between C99 and
> C++11 (*) but I think he overlooked the two lines at the bottom that
> convert a 0 result to 1.

You also get 0 for a partial UCN, which is significant for
forms_identifier_p.

Also this part of the comment needs to be adjusted:

   Otherwise the nonzero value of the UCN, whether valid or invalid,
   is returned.

Andreas.

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Andreas Schwab, schwab@linux-m68k.org
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