.\"	$OpenBSD: iswalnum.3,v 1.4 2011/04/29 11:24:24 stsp Exp $
.\"	$NetBSD: iswalnum.3,v 1.8 2003/09/08 17:54:31 wiz Exp $
.\"
.\" Copyright (c) 1991 The Regents of the University of California.
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.\" This code is derived from software contributed to Berkeley by
.\" the American National Standards Committee X3, on Information
.\" Processing Systems.
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.\"     @(#)isalnum.3	5.2 (Berkeley) 6/29/91
.\"
.Dd $Mdocdate: April 29 2011 $
.Dt ISWALNUM 3
.Os
.Sh NAME
.Nm iswalnum ,
.Nm iswalpha ,
.Nm iswblank ,
.Nm iswcntrl ,
.Nm iswdigit ,
.Nm iswgraph ,
.Nm iswlower ,
.Nm iswprint ,
.Nm iswpunct ,
.Nm iswspace ,
.Nm iswupper ,
.Nm iswxdigit
.Nd wide-character classification utilities
.Sh SYNOPSIS
.Fd #include <wctype.h>
.Ft int
.Fn iswalnum "wint_t wc"
.Ft int
.Fn iswalpha "wint_t wc"
.Ft int
.Fn iswblank "wint_t wc"
.Ft int
.Fn iswcntrl "wint_t wc"
.Ft int
.Fn iswdigit "wint_t wc"
.Ft int
.Fn iswgraph "wint_t wc"
.Ft int
.Fn iswlower "wint_t wc"
.Ft int
.Fn iswprint "wint_t wc"
.Ft int
.Fn iswpunct "wint_t wc"
.Ft int
.Fn iswspace "wint_t wc"
.Ft int
.Fn iswupper "wint_t wc"
.Ft int
.Fn iswxdigit "wint_t wc"
.Sh DESCRIPTION
The functions are character classification utility functions,
for use with wide characters
.Po
.Fa wchar_t
or
.Fa wint_t
.Pc .
See the description of singlebyte classification functions, like
.Xr isalnum 3 ,
for details.
.Sh RETURN VALUES
The functions return zero if the character tests false and
return non-zero if the character tests true.
.Sh SEE ALSO
.Xr isalnum 3 ,
.Xr isalpha 3 ,
.Xr isblank 3 ,
.Xr iscntrl 3 ,
.Xr isdigit 3 ,
.Xr isgraph 3 ,
.Xr islower 3 ,
.Xr isprint 3 ,
.Xr ispunct 3 ,
.Xr isspace 3 ,
.Xr isupper 3 ,
.Xr isxdigit 3
.Sh STANDARDS
The functions conform to
.\" .St -isoC99 .
ISO/IEC 9899:1999
.Pq Dq ISO C99 .
.Sh CAVEATS
The argument to these functions must be
.Dv WEOF
or a valid
.Fa wchar_t
value with the current locale; otherwise, the result is undefined.
.Sh BUGS
In a UTF-8 locale these functions return wrong answers for some characters
because they do not cover the entire Unicode character set.