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man:iswupper

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 isup-
     per(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-charac-
     ter class "upper" is disjoint from the wide-character class "cntrl".
     Being  a subclass of the wide-character class "graph", the wide-charac-
     ter 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-charac-
     ter class "upper" is disjoint from the wide-character class "punct".
     Being a subclass of the wide-character class "alpha", the  wide-charac-
     ter 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 cur-
     rent locale.
     This  function is not very appropriate for dealing with Unicode charac-
     ters, 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 4.16 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)

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