iswupper(3) - Linux man page
Name
iswupper - test for uppercase wide characterSynopsis
#include <wctype.h> int iswupper(wint_t wc);
Description
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 aqAaq to aqZaq.
Return Value
The iswupper() function returns nonzero 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.