1.\" $NetBSD: isalnum.3,v 1.15 2008/04/17 16:25:36 apb Exp $ 2.\" 3.\" Copyright (c) 1991 The Regents of the University of California. 4.\" All rights reserved. 5.\" 6.\" This code is derived from software contributed to Berkeley by 7.\" the American National Standards Committee X3, on Information 8.\" Processing Systems. 9.\" 10.\" Redistribution and use in source and binary forms, with or without 11.\" modification, are permitted provided that the following conditions 12.\" are met: 13.\" 1. Redistributions of source code must retain the above copyright 14.\" notice, this list of conditions and the following disclaimer. 15.\" 2. Redistributions in binary form must reproduce the above copyright 16.\" notice, this list of conditions and the following disclaimer in the 17.\" documentation and/or other materials provided with the distribution. 18.\" 3. Neither the name of the University nor the names of its contributors 19.\" may be used to endorse or promote products derived from this software 20.\" without specific prior written permission. 21.\" 22.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32.\" SUCH DAMAGE. 33.\" 34.\" @(#)isalnum.3 5.2 (Berkeley) 6/29/91 35.\" 36.Dd April 17, 2008 37.Dt ISALNUM 3 38.Os 39.Sh NAME 40.Nm isalnum 41.Nd alphanumeric character test 42.Sh LIBRARY 43.Lb libc 44.Sh SYNOPSIS 45.In ctype.h 46.Ft int 47.Fn isalnum "int c" 48.Sh DESCRIPTION 49The 50.Fn isalnum 51function tests for any character for which 52.Xr isalpha 3 53or 54.Xr isdigit 3 55is true. 56.Sh RETURN VALUES 57The 58.Fn isalnum 59function returns zero if the character tests false and 60returns non-zero if the character tests true. 61.Sh SEE ALSO 62.Xr ctype 3 , 63.Xr isalpha 3 , 64.Xr isascii 3 , 65.Xr isblank 3 , 66.Xr iscntrl 3 , 67.Xr isdigit 3 , 68.Xr isgraph 3 , 69.Xr islower 3 , 70.Xr isprint 3 , 71.Xr ispunct 3 , 72.Xr isspace 3 , 73.Xr isupper 3 , 74.Xr isxdigit 3 , 75.Xr stdio 3 , 76.Xr toascii 3 , 77.Xr tolower 3 , 78.Xr toupper 3 , 79.Xr ascii 7 80.Sh STANDARDS 81The 82.Fn isalnum 83function conforms to 84.St -ansiC . 85.Sh CAVEATS 86The argument to 87.Fn isalnum 88must be 89.Dv EOF 90or representable as an 91.Vt unsigned char ; 92otherwise, the behavior is undefined. 93See the 94.Sx CAVEATS 95section of 96.Xr ctype 3 97for more details. 98