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.b #include <wctype.h>
.pp
.bi "int iswupper(wint_t " wc );
.fi
.sh description
the
.br iswupper ()
function is the wide-character equivalent of the
.br isupper (3)
function.
it tests whether
.i wc
is a wide character
belonging to the wide-character class "upper".
.pp
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".
.pp
being a subclass of the wide-character class "print", the wide-character class
"upper" is disjoint from the wide-character class "cntrl".
.pp
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".
.pp
being a subclass of the wide-character class "alnum", the wide-character class
"upper" is disjoint from the wide-character class "punct".
.pp
being a subclass of the wide-character class "alpha", the wide-character class
"upper" is disjoint from the wide-character class "digit".
.pp
the wide-character class "upper" contains at least those characters
.i wc
which are equal to
.i towupper(wc)
and different from
.ir towlower(wc) .
.pp
the wide-character class "upper" always contains at least the
letters \(aqa\(aq to \(aqz\(aq.
.sh return value
the
.br iswupper ()
function returns nonzero if
.i wc
is a wide character
belonging to the wide-character class "upper".
otherwise, it returns zero.
.sh attributes
for an explanation of the terms used in this section, see
.br attributes (7).
.ad l
.nh
.ts
allbox;
lbx lb lb
l l l.
interface attribute value
t{
.br iswupper ()
t} thread safety mt-safe locale
.te
.hy
.ad
.sp 1
.sh conforming to
posix.1-2001, posix.1-2008, c99.
.sh notes
the behavior of
.br iswupper ()
depends on the
.b lc_ctype
category of the
current locale.
.pp
this function is not very appropriate for dealing with unicode characters,
because unicode knows about three cases: upper, lower, and title case.
.sh see also
.br isupper (3),
.br iswctype (3),
.br towupper (3)
.sh colophon
this page is part of release 5.13 of the linux
.i 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/.
.\" copyright 2002 walter harms ([email protected])
.\"
.\" %%%license_start(gpl_noversion_oneline)
.\" distributed under gpl
.\" %%%license_end
.\"
.th csinh 3 2021-03-22 "" "linux programmer's manual"
.sh name