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 |
POSIX.1-2001, POSIX.1-2008, C99.
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.
isupper(3),
iswctype(3),
towupper(3)