1.\" 2.\" Copyright (c) 2004 Tim J. Robbins 3.\" All rights reserved. 4.\" 5.\" Redistribution and use in source and binary forms, with or without 6.\" modification, are permitted provided that the following conditions 7.\" are met: 8.\" 1. Redistributions of source code must retain the above copyright 9.\" notice, this list of conditions and the following disclaimer. 10.\" 2. Redistributions in binary form must reproduce the above copyright 11.\" notice, this list of conditions and the following disclaimer in the 12.\" documentation and/or other materials provided with the distribution. 13.\" 14.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 15.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 17.\" ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 18.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 19.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 20.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 21.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 22.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 23.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 24.\" SUCH DAMAGE. 25.\" 26.\" $FreeBSD: head/lib/libc/locale/isrune.3 196820 2009-09-04 07:44:58Z des $ 27.\" 28.Dd December 25, 2013 29.Dt ISRUNE 3 30.Os 31.Sh NAME 32.Nm isrune , 33.Nm isrune_l 34.Nd valid character test 35.Sh LIBRARY 36.Lb libc 37.Sh SYNOPSIS 38.In ctype.h 39.Ft int 40.Fn isrune "int c" 41.In xlocale.h 42.Ft int 43.Fn isrune_l "int c" "locale_t locale" 44.Sh DESCRIPTION 45The 46.Fn isrune 47and 48.Fn isrune_l 49functions test for any character that is valid in the current 50character set. 51In the 52.Tn ASCII 53character set, this is equivalent to 54.Fn isascii . 55.Pp 56The _l-suffixed version takes an explicit 57.Fa locale 58argument, whereas the 59non-suffixed version uses the current global or per-thread locale. 60.Sh RETURN VALUES 61The 62.Fn isrune 63and 64.Fn isrune_l 65functions return zero if the character tests false and 66returns non-zero if the character tests true. 67.Sh SEE ALSO 68.Xr ctype 3 , 69.Xr ctype_l 3 , 70.Xr isascii 3 , 71.Xr iswrune 3 , 72.Xr xlocale 3 , 73.Xr ascii 7 74.Sh HISTORY 75The 76.Fn isrune 77function appeared in 78.Bx 4.4 . 79