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`iswpunct'--punctuation wide-character test

     #include <wctype.h>
     int iswpunct(wint_t C);
`iswpunct' is a function which classifies wide-character values that
are punctuation.
`iswpunct' returns non-zero if C is a punctuation wide-character.
`iswpunct' is C99.
   No supporting OS subroutines are required.