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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 3.65 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/.



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