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.\"	$NetBSD: isalnum.3,v 1.10 2002/07/10 23:31:32 wiz Exp $
.\"
.\" Copyright (c) 1991 The Regents of the University of California.
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.\" the American National Standards Committee X3, on Information
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.\"     @(#)isalnum.3	5.2 (Berkeley) 6/29/91
.\"
.Dd June 29, 1991
.Dt ISALNUM 3
.Os
.Sh NAME
.Nm isalnum
.Nd alphanumeric character test
.Sh LIBRARY
.Lb libc
.Sh SYNOPSIS
.Fd #include \*[Lt]ctype.h\*[Gt]
.Ft int
.Fn isalnum "int c"
.Sh DESCRIPTION
The
.Fn isalnum
macro tests for any character for which
.Xr isalpha 3
or
.Xr isdigit 3
is true.
.Sh RETURN VALUES
The
.Fn isalnum
macro returns zero if the character tests false and
returns non-zero if the character tests true.
.Sh SEE ALSO
.Xr isalpha 3 ,
.Xr isascii 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 ,
.Xr stdio 3 ,
.Xr toascii 3 ,
.Xr tolower 3 ,
.Xr toupper 3 ,
.Xr ascii 7
.Sh STANDARDS
The
.Fn isalnum
function conforms to
.St -ansiC .
.Sh CAVEATS
The argument to
.Fn isalnum
must be
.Dv EOF
or representable as an
.Li unsigned char ;
otherwise, the result is undefined.