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 4.08 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                      ISWALNUM(3)