1.\" $OpenBSD: isascii.3,v 1.8 2001/06/25 03:23:57 pjanzen Exp $ 2.\" 3.\" Copyright (c) 1989, 1991 The Regents of the University of California. 4.\" All rights reserved. 5.\" 6.\" Redistribution and use in source and binary forms, with or without 7.\" modification, are permitted provided that the following conditions 8.\" are met: 9.\" 1. Redistributions of source code must retain the above copyright 10.\" notice, this list of conditions and the following disclaimer. 11.\" 2. Redistributions in binary form must reproduce the above copyright 12.\" notice, this list of conditions and the following disclaimer in the 13.\" documentation and/or other materials provided with the distribution. 14.\" 3. All advertising materials mentioning features or use of this software 15.\" must display the following acknowledgement: 16.\" This product includes software developed by the University of 17.\" California, Berkeley and its contributors. 18.\" 4. 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.Dd May 2, 1991 35.Dt ISASCII 3 36.Os 37.Sh NAME 38.Nm isascii 39.Nd ASCII character test 40.Sh SYNOPSIS 41.Fd #include <ctype.h> 42.Ft int 43.Fn isascii "int c" 44.Sh DESCRIPTION 45The 46.Fn isascii 47function tests for an 48.Tn ASCII 49character, which is any character with a value less than or 50equal to 0177. 51.Sh RETURN VALUES 52The 53.Fn isascii 54macro returns zero if the character tests false or 55non-zero if the character tests true. 56.Sh SEE ALSO 57.Xr isalnum 3 , 58.Xr isalpha 3 , 59.Xr isblank 3 , 60.Xr iscntrl 3 , 61.Xr isdigit 3 , 62.Xr isgraph 3 , 63.Xr islower 3 , 64.Xr isprint 3 , 65.Xr ispunct 3 , 66.Xr isspace 3 , 67.Xr isupper 3 , 68.Xr isxdigit 3 , 69.Xr stdio 3 , 70.Xr toascii 3 , 71.Xr tolower 3 , 72.Xr toupper 3 , 73.Xr ascii 7 74.Sh STANDARDS 75The 76.Fn isascii 77function conforms to 78.St -xpg4 . 79.Sh CAVEATS 80The argument to 81.Fn isascii 82must be 83.Dv EOF 84or representable as an 85.Li unsigned char ; 86otherwise, the result is undefined. 87