ISWALNUM(3) Linux Programmer's Manual ISWALNUM(3)NAMEiswalnum - 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 isal‐
num(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-charac‐
ter class "alnum" is disjoint from the wide-character class "cntrl".
Being a subclass of the wide-character class "graph", the wide-charac‐
ter 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-char‐
acter 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 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 iswalnum() depends on the LC_CTYPE category of the cur‐
rent locale.
SEE ALSOisalnum(3), iswctype(3)COLOPHON
This page is part of release 3.22 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
GNU 1999-07-25 ISWALNUM(3)