NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | CONFORMING TO | NOTES | SEE ALSO | COLOPHON
ISWUPPER(3) Linux Programmer's Manual ISWUPPER(3)
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 non-zero if wc is a wide character belonging
to the wide-character class "upper". Otherwise it returns zero.
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)
This page is part of release 3.23 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can be found
at http://www.kernel.org/doc/man-pages/.
GNU 1999-07-25 ISWUPPER(3)