iswalnum(3) — Linux manual page

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUE | ATTRIBUTES | CONFORMING TO | NOTES | SEE ALSO | COLOPHON

ISWALNUM(3)             Linux Programmer's Manual            ISWALNUM(3)

NAME         top

       iswalnum - test for alphanumeric wide character

SYNOPSIS         top

       #include <wctype.h>

       int iswalnum(wint_t wc);

DESCRIPTION         top

       The iswalnum() function is the wide-character equivalent of the
       isalnum(3) function.  It tests whether wc is a wide character
       belonging to the wide-character class "alnum".

       The wide-character class "alnum" is a subclass of the wide-
       character class "graph", and therefore also a subclass of the
       wide-character class "print".

       Being a subclass of the wide-character class "print", the wide-
       character class "alnum" is disjoint from the wide-character class
       "cntrl".

       Being a subclass of the wide-character class "graph", the wide-
       character class "alnum" is disjoint from the wide-character class
       "space" and its subclass "blank".

       The wide-character class "alnum" is disjoint from the wide-
       character class "punct".

       The wide-character class "alnum" is the union of the wide-
       character classes "alpha" and "digit".  As such, it also contains
       the wide-character class "xdigit".

       The wide-character class "alnum" always contains at least the
       letters 'A' to 'Z', 'a' to 'z' and the digits '0' to '9'.

RETURN VALUE         top

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

ATTRIBUTES         top

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

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

CONFORMING TO         top

       POSIX.1-2001, POSIX.1-2008, C99.

NOTES         top

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

SEE ALSO         top

       isalnum(3), iswctype(3)

COLOPHON         top

       This page is part of release 5.11 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                            2021-03-22                    ISWALNUM(3)

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