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.

ATTRIBUTES

       For an explanation of the terms used in this section, see attributes(7).
       ┌────────────┬───────────────┬────────────────┐
       │ Interface  │ Attribute     │ Value          │
       ├────────────┼───────────────┼────────────────┤
       │ iswupper() │ Thread safety │ MT-Safe locale │
       └────────────┴───────────────┴────────────────┘

CONFORMING TO

       POSIX.1-2001, POSIX.1-2008, 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 5.10 of  the  Linux  man-pages  project.   A  description  of  the  project,
       information   about   reporting   bugs,   and   the  latest  version  of  this  page,  can  be  found  at
       https://www.kernel.org/doc/man-pages/.

GNU                                                2015-08-08                                        ISWUPPER(3)