iswupper - test for uppercase wide character
#include <wctype.h>
int iswupper (wint_t wc);
The iswupper function is the wide-character equivalent of the isupper
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'.
The iswupper function returns non-zero if wc is a wide character
belonging to the wide character class "upper". Otherwise it returns
zero.
ISO/ANSI C, UNIX98
isupper(3), iswctype(3), towupper(3)
The behaviour 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.
GNU 1999-07-25 ISWUPPER(3)
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