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 is-
       digit(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 be-
       longing to the wide-character class  "digit".   Otherwise,  it  returns
       zero.

ATTRIBUTES
       For  an  explanation  of  the  terms  used  in  this  section,  see at-
       tributes(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 5.05 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)