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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) func-
       tion.  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 non-zero 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 3.22 of the Linux man-pages project.  A description of
       the  project, and information about reporting bugs, can be found at http://www.ker-
       nel.org/doc/man-pages/.



GNU                               1999-07-25                       ISWUPPER(3)

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