iswalnum

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



NAME
       iswalnum - test for alphanumeric wide character

SYNOPSIS
       #include <wctype.h>

       int iswalnum(wint_t wc);

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

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

       ┌───────────┬───────────────┬────────────────┐
       │Interface  Attribute     Value          │
       ├───────────┼───────────────┼────────────────┤
       │iswalnum() │ Thread safety │ MT-Safe locale │
       └───────────┴───────────────┴────────────────┘
CONFORMING TO
       POSIX.1-2001, POSIX.1-2008, C99.

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

SEE ALSO
       isalnum(3), iswctype(3)

COLOPHON
       This page is part of release 5.02 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)