.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
.\"
.\" This is free documentation; you can redistribute it and/or
.\" modify it under the terms of the GNU General Public License as
.\" published by the Free Software Foundation; either version 2 of
.\" the License, or (at your option) any later version.
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.\" References consulted:
.\"   GNU glibc-2 source code and manual
.\"   Dinkumware C library reference http://www.dinkumware.com/
.\"   OpenGroup's Single Unix specification http://www.UNIX-systems.org/online.html
.\"   ISO/IEC 9899:1999
.\"
.TH ISWALNUM 3  1999-07-25 "GNU" "Linux Programmer's Manual"
.SH NAME
iswalnum \- test for alphanumeric wide character
.SH SYNOPSIS
.nf
.B #include <wctype.h>
.sp
.BI "int iswalnum(wint_t " wc );
.fi
.SH DESCRIPTION
The \fBiswalnum\fP() function is the wide-character equivalent of the
\fBisalnum\fP() function.
It tests whether \fIwc\fP is a wide character
belonging to the wide-character class "alnum".
.PP
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".
.PP
Being a subclass of the wide-character class "print",
the wide-character class
"alnum" is disjoint from the wide-character class "cntrl".
.PP
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".
.PP
The wide-character class "alnum" is disjoint from the wide-character class
"punct".
.PP
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".
.PP
The wide-character class "alnum" always contains at least the letters 'A'
to 'Z', 'a' to 'z' and the digits '0' to '9'.
.SH "RETURN VALUE"
The \fBiswalnum\fP() function returns non-zero
if \fIwc\fP is a wide character
belonging to the wide-character class "alnum".
Otherwise it returns zero.
.SH "CONFORMING TO"
C99.
.SH "SEE ALSO"
.BR isalnum (3),
.BR iswctype (3)
.SH NOTES
The behaviour of \fBiswalnum\fP() depends on the LC_CTYPE category of the
current locale.