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(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'.
The iswupper
() function
returns nonzero if wc
is a wide character belonging to the wide-character class
"upper". Otherwise, it returns zero.
For an explanation of the terms used in this section, see attributes(7).
Interface | Attribute | Value |
iswupper () |
Thread safety | MT-Safe locale |
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.