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 ISSPECIAL 3 30.Os 31.Sh NAME 32.Nm isspecial , 33.Nm isspecial_l 34.Nd special character test 35.Sh LIBRARY 36.Lb libc 37.Sh SYNOPSIS 38.In ctype.h 39.Ft int 40.Fn isspecial "int c" 41.Ft int 42.Fn isspecial_l "int c" "locale_t loc" 43.Sh DESCRIPTION 44The 45.Fn isspecial 46and 47.Fn isspecial_l 48functions test for a special character. 49.Pp 50The 51.Fn isspecial_l 52function takes an explicit locale argument, whereas the 53.Fn isspecial 54function uses the current global or per-thread locale. 55.Sh RETURN VALUES 56The 57.Fn isspecial 58and 59.Fn isspecial_l 60functions return zero if the character tests false and 61return non-zero if the character tests true. 62.Sh COMPATIBILITY 63The 64.Bx 4.4 65extension of accepting arguments outside of the range of the 66.Vt "unsigned char" 67type in locales with large character sets is considered obsolete 68and may not be supported in future releases. 69The 70.Fn iswspecial 71or 72.Fn iswspecial_l 73function should be used instead. 74.Sh SEE ALSO 75.Xr ctype 3 , 76.Xr ctype_l 3 , 77.Xr iswspecial 3 , 78.Xr iswspecial_l 3 , 79.Xr xlocale 3 80.Sh HISTORY 81The 82.Fn isspecial 83function appeared in 84.Bx 4.4 . 85