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 ISSPECIAL 3 28.Os 29.Sh NAME 30.Nm isspecial , 31.Nm isspecial_l 32.Nd special character test 33.Sh LIBRARY 34.Lb libc 35.Sh SYNOPSIS 36.In ctype.h 37.Ft int 38.Fn isspecial "int c" 39.Ft int 40.Fn isspecial_l "int c" "locale_t loc" 41.Sh DESCRIPTION 42The 43.Fn isspecial 44and 45.Fn isspecial_l 46functions test for a special character. 47.Pp 48The 49.Fn isspecial_l 50function takes an explicit locale argument, whereas the 51.Fn isspecial 52function uses the current global or per-thread locale. 53.Sh RETURN VALUES 54The 55.Fn isspecial 56and 57.Fn isspecial_l 58functions return zero if the character tests false and 59return non-zero if the character tests true. 60.Sh COMPATIBILITY 61The 62.Bx 4.4 63extension of accepting arguments outside of the range of the 64.Vt "unsigned char" 65type in locales with large character sets is considered obsolete 66and may not be supported in future releases. 67The 68.Fn iswspecial 69or 70.Fn iswspecial_l 71function should be used instead. 72.Sh SEE ALSO 73.Xr ctype 3 , 74.Xr ctype_l 3 , 75.Xr iswspecial 3 , 76.Xr iswspecial_l 3 , 77.Xr xlocale 3 78.Sh HISTORY 79The 80.Fn isspecial 81function appeared in 82.Bx 4.4 . 83