man:iswdigit
ISWDIGIT(3) Linux Programmer's Manual ISWDIGIT(3)
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-charac- ter class "digit" is disjoint from the wide-character class "cntrl".
Being a subclass of the wide-character class "graph", the wide-charac- ter 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-charac- ter 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 '0' to '9'.
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 cur- rent locale.
SEE ALSO
isdigit(3), iswctype(3)
COLOPHON
This page is part of release 4.16 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/.
GNU 2015-08-08 ISWDIGIT(3)
/data/webs/external/dokuwiki/data/pages/man/iswdigit.txt · Last modified: 2019/05/17 09:32 by 127.0.0.1