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 _zsingle_quotesz_A_zsingle_quotesz_ to _zsingle_quotesz_Z_zsingle_quotesz_, _zsingle_quotesz_a_zsingle_quotesz_ to _zsingle_quotesz_z_zsingle_quotesz_ and the digits _zsingle_quotesz_0_zsingle_quotesz_ to _zsingle_quotesz_9_zsingle_quotesz_.

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).

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)