NAME
iswupper - test for uppercase wide character
SYNOPSIS
#include <wctype.h>
I int iswupper(wint_t wc );
DESCRIPTION
The
R 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 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
R 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
R 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
ČLÁNKY DO MAILU