ISWUPPER
Section: Linux Programmer's Manual (3)
Updated: 2015-08-08
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NAME
iswupper - test for uppercase wide character
SYNOPSIS
#include <wctype.h>
int iswupper(wint_t wc);
DESCRIPTION
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 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.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
iswupper()
| Thread safety | MT-Safe locale
|
CONFORMING TO
POSIX.1-2001, POSIX.1-2008, 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.
SEE ALSO
isupper(3),
iswctype(3),
towupper(3)
COLOPHON
This page is part of release 4.13 of the Linux
man-pages
project.
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
https://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ATTRIBUTES
-
- CONFORMING TO
-
- NOTES
-
- SEE ALSO
-
- COLOPHON
-
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