ISWUPPER(3)                                         Linux Programmer's Manual                                        ISWUPPER(3)



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 char-
       acter 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-charac-
       ter class "cntrl".

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

       Being a subclass of the wide-character class "alpha", the wide-character class "upper" is disjoint from the  wide-charac-
       ter 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".   Other-
       wise 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 3.25 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/.



GNU                                                        1999-07-25                                                ISWUPPER(3)