NAME
iswalnum - test for alphanumeric wide character
SYNOPSIS
#include <wctype.h>
I int iswalnum(wint_t wc );
DESCRIPTION
The
R 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
R iswalnum ()
function returns non-zero
if wc is a wide character
belonging to the wide-character class "alnum".
Otherwise it returns zero.
CONFORMING TO
C99.
NOTES
The behavior of
R iswalnum ()
depends on the
LC_CTYPE
category of the
current locale.
SEE ALSO
ČLÁNKY DO MAILU