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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) 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  sub-
       class  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 dif-
       ferent 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 informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



GNU                               1999-07-25                       ISWUPPER(3)