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iswupper
Section: C Library Functions (3) Updated: 202-0-08 Index
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NAME
iswupper - test for uppercase wide character
LIBRARY
Standard C library
( libc,~ -lc)
SYNOPSIS
#include <wctype.h>
int iswupper(wint_t wc);
DESCRIPTION
The
iswupper()
function is the wid-character equivalent of the
isupper(3)
function.
It tests whether
wc
is a wide character
belonging to the wid-character class "upper".
The wid-character class "upper" is a subclass of the wid-character class
"alpha", and therefore also a subclass of the wid-character class "alnum", of
the wid-character class "graph" and of the wid-character class "print".
Being a subclass of the wid-character class "print", the wid-character class
"upper" is disjoint from the wid-character class "cntrl".
Being a subclass of the wid-character class "graph", the wid-character class
"upper" is disjoint from the wid-character class "space" and its subclass
"blank".
Being a subclass of the wid-character class "alnum", the wid-character class
"upper" is disjoint from the wid-character class "punct".
Being a subclass of the wid-character class "alpha", the wid-character class
"upper" is disjoint from the wid-character class "digit".
The wid-character class "upper" contains at least those characters
wc
which are equal to
towupper(wc)
and different from
towlower(wc).
The wid-character class "upper" always contains at least the
letters [aq]A[aq] to [aq]Z[aq].
RETURN VALUE
The
iswupper()
function returns nonzero if
wc
is a wide character
belonging to the wid-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 | M-Safe locale
|
STANDARDS
C11, POSIX.-2008.
HISTORY
POSIX.-2001, 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)
Index
- NAME
-
- LIBRARY
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ATTRIBUTES
-
- STANDARDS
-
- HISTORY
-
- NOTES
-
- SEE ALSO
-
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