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x SuSE Linux 13.1-RELEASEx
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 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 nonzero if wc is a wide character
belonging to the wide-character class "alnum". Otherwise, it returns
zero.
ATTRIBUTES
Multithreading (see pthreads(7))
The iswalnum() function is thread-safe with exceptions. It can be
safely used in multithreaded applications, as long as setlocale(3) is
not called to change the locale during its execution.
CONFORMING TO
C99.
NOTES
The behavior of iswalnum() depends on the LC_CTYPE category of the cur-
rent locale.
SEE ALSO
isalnum(3), iswctype(3)
COLOPHON
This page is part of release 3.69 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
http://www.kernel.org/doc/man-pages/.
GNU 2014-01-28 ISWALNUM(3)
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