NAME

       iswalnum - test for alphanumeric wide character

LIBRARY

       Standard C library (libc, -lc)

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 │
       └────────────────────────────────────────────────────────┴───────────────┴────────────────┘

STANDARDS

       C11, POSIX.1-2008.

HISTORY

       POSIX.1-2001, C99.

NOTES

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

SEE ALSO

       isalnum(3), iswctype(3)