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.\" $FreeBSD$ 27.\" 28.Dd December 19, 2022 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.Ft int 42.Fn isrune_l "int c" "locale_t loc" 43.Sh DESCRIPTION 44The 45.Fn isrune 46and 47.Fn isrune_l 48functions test for any character that is valid in the current 49character set. 50In the 51.Tn ASCII 52character set, this is equivalent to 53.Fn isascii . 54.Pp 55The 56.Fn isrune_l 57function takes an explicit locale argument, whereas the 58.Fn isrune 59function 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 66return non-zero if the character tests true. 67.Sh COMPATIBILITY 68The 69.Bx 4.4 70extension of accepting arguments outside of the range of the 71.Vt "unsigned char" 72type in locales with large character sets is considered obsolete 73and may not be supported in future releases. 74The 75.Fn iswrune 76or 77.Fn iswrune_l 78function should be used instead. 79.Sh SEE ALSO 80.Xr ctype 3 , 81.Xr ctype_l 3 , 82.Xr isascii 3 , 83.Xr iswrune 3 , 84.Xr iswrune_l 3 , 85.Xr xlocale 3 , 86.Xr ascii 7 87.Sh HISTORY 88The 89.Fn isrune 90function appeared in 91.Bx 4.4 . 92