ISWDIGIT
Section: Linux Programmer's Manual (3)
Updated: 2015-08-08
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NAME
iswdigit - test for decimal digit wide character
SYNOPSIS
#include <wctype.h>
int iswdigit(wint_t wc);
DESCRIPTION
The
iswdigit()
function is the wide-character equivalent of the
isdigit(3)
function.
It tests whether
wc
is a wide character
belonging to the wide-character class "digit".
The wide-character class "digit" is a subclass of the wide-character class
"xdigit", 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
"digit" is disjoint from the wide-character class "cntrl".
Being a subclass of the wide-character class "graph",
the wide-character class
"digit" 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
"digit" is disjoint from the wide-character class "punct".
The wide-character class "digit" is
disjoint from the wide-character class
"alpha" and therefore also disjoint from its subclasses "lower", "upper".
The wide-character class "digit" always
contains exactly the digits aq0aq to aq9aq.
RETURN VALUE
The
iswdigit()
function returns nonzero
if
wc
is a wide character
belonging to the wide-character class "digit".
Otherwise, it returns zero.
ATTRIBUTES
For an explanation of the terms used in this section, see
attributes(7).
| Interface | Attribute | Value
|
|
iswdigit()
| Thread safety | MT-Safe locale
|
CONFORMING TO
POSIX.1-2001, POSIX.1-2008, C99.
NOTES
The behavior of
iswdigit()
depends on the
LC_CTYPE
category of the
current locale.
SEE ALSO
isdigit(3),
iswctype(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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