iswdigit(3) — Linux manual page

iswdigit(3)             Library Functions Manual             iswdigit(3)

NAME         top

       iswdigit - test for decimal digit wide character

LIBRARY         top

       Standard C library (libc, -lc)

SYNOPSIS         top

       #include <wctype.h>

       int iswdigit(wint_t wc);

DESCRIPTION         top

       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 '0' to '9'.

RETURN VALUE         top

       The iswdigit() function returns nonzero if wc is a wide character
       belonging to the wide-character class "digit".  Otherwise, it
       returns zero.

ATTRIBUTES         top

       For an explanation of the terms used in this section, see
       attributes(7).

       ┌───────────────────────────────┬───────────────┬────────────────┐
       │Interface                      │ Attribute     │ Value          │
       ├───────────────────────────────┼───────────────┼────────────────┤
       │iswdigit()                     │ Thread safety │ MT-Safe locale │
       └───────────────────────────────┴───────────────┴────────────────┘

STANDARDS         top

       C11, POSIX.1-2008.

HISTORY         top

       POSIX.1-2001, C99.

NOTES         top

       The behavior of iswdigit() depends on the LC_CTYPE category of
       the current locale.

SEE ALSO         top

       isdigit(3), iswctype(3)

Linux man-pages 6.04           2023-03-30                    iswdigit(3)

Pages that refer to this page: isalpha(3),  iswctype(3)

HTML rendering created 2023-06-24 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH.