trusty (3) iswupper.3.gz

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NAME
       iswupper - test for uppercase wide character


SYNOPSIS
       #include <wctype.h>

       int iswupper(wint_t wc);


DESCRIPTION
       The iswupper() function is the wide-character equivalent of the isupper(3) function.  It tests whether wc
       is a wide character belonging to the wide-character class "upper".

       The wide-character class "upper" is a subclass of the wide-character class "alpha", and therefore also  a
       subclass  of  the  wide-character  class  "alnum",  of  the wide-character class "graph" and of the wide-
       character class "print".

       Being a subclass of the wide-character class "print", the wide-character class "upper" is  disjoint  from
       the wide-character class "cntrl".

       Being  a  subclass of the wide-character class "graph", the wide-character class "upper" is disjoint from
       the wide-character class "space" and its subclass "blank".

       Being a subclass of the wide-character class "alnum", the wide-character class "upper" is  disjoint  from
       the wide-character class "punct".

       Being  a  subclass of the wide-character class "alpha", the wide-character class "upper" is disjoint from
       the wide-character class "digit".

       The wide-character class "upper" contains at least those characters wc which are  equal  to  towupper(wc)
       and different from towlower(wc).

       The wide-character class "upper" always contains at least the letters 'A' to 'Z'.


RETURN VALUE
       The  iswupper()  function returns nonzero if wc is a wide character belonging to the wide-character class
       "upper".  Otherwise it returns zero.


CONFORMING TO
       C99.


NOTES
       The behavior of iswupper() depends on the LC_CTYPE category of the current locale.

       This function is not very appropriate for dealing with Unicode characters, because  Unicode  knows  about
       three cases: upper, lower and title case.


SEE ALSO
       isupper(3), iswctype(3), towupper(3)


COLOPHON
       This  page  is  part  of  release 3.54 of the Linux man-pages project.  A description of the project, and
       information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.