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.Dd December 19, 2022 27.Dt ISRUNE 3 28.Os 29.Sh NAME 30.Nm isrune , 31.Nm isrune_l 32.Nd valid character test 33.Sh LIBRARY 34.Lb libc 35.Sh SYNOPSIS 36.In ctype.h 37.Ft int 38.Fn isrune "int c" 39.Ft int 40.Fn isrune_l "int c" "locale_t loc" 41.Sh DESCRIPTION 42The 43.Fn isrune 44and 45.Fn isrune_l 46functions test for any character that is valid in the current 47character set. 48In the 49.Tn ASCII 50character set, this is equivalent to 51.Fn isascii . 52.Pp 53The 54.Fn isrune_l 55function takes an explicit locale argument, whereas the 56.Fn isrune 57function uses the current global or per-thread locale. 58.Sh RETURN VALUES 59The 60.Fn isrune 61and 62.Fn isrune_l 63functions return zero if the character tests false and 64return non-zero if the character tests true. 65.Sh COMPATIBILITY 66The 67.Bx 4.4 68extension of accepting arguments outside of the range of the 69.Vt "unsigned char" 70type in locales with large character sets is considered obsolete 71and may not be supported in future releases. 72The 73.Fn iswrune 74or 75.Fn iswrune_l 76function should be used instead. 77.Sh SEE ALSO 78.Xr ctype 3 , 79.Xr ctype_l 3 , 80.Xr isascii 3 , 81.Xr iswrune 3 , 82.Xr iswrune_l 3 , 83.Xr xlocale 3 , 84.Xr ascii 7 85.Sh HISTORY 86The 87.Fn isrune 88function appeared in 89.Bx 4.4 . 90