1.\" Copyright (c) 1991, 1993 2.\" The Regents of the University of California. All rights reserved. 3.\" 4.\" This code is derived from software contributed to Berkeley by 5.\" the American National Standards Committee X3, on Information 6.\" Processing Systems. 7.\" 8.\" Redistribution and use in source and binary forms, with or without 9.\" modification, are permitted provided that the following conditions 10.\" are met: 11.\" 1. Redistributions of source code must retain the above copyright 12.\" notice, this list of conditions and the following disclaimer. 13.\" 2. Redistributions in binary form must reproduce the above copyright 14.\" notice, this list of conditions and the following disclaimer in the 15.\" documentation and/or other materials provided with the distribution. 16.\" 3. Neither the name of the University nor the names of its contributors 17.\" may be used to endorse or promote products derived from this software 18.\" without specific prior written permission. 19.\" 20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 23.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 25.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 26.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 27.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 28.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 29.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 30.\" SUCH DAMAGE. 31.\" 32.\" @(#)isxdigit.3 8.1 (Berkeley) 6/4/93 33.\" $FreeBSD: head/lib/libc/locale/isxdigit.3 233992 2012-04-07 09:05:30Z joel $ 34.\" 35.Dd December 25, 2013 36.Dt ISXDIGIT 3 37.Os 38.Sh NAME 39.Nm isxdigit , isxdigit_l , ishexnumber , ishexnumber_l 40.Nd hexadecimal-digit character test 41.Sh LIBRARY 42.Lb libc 43.Sh SYNOPSIS 44.In ctype.h 45.Ft int 46.Fn isxdigit "int c" 47.Ft int 48.Fn isxdigit_l "int c" "locale_t locale" 49.In xlocale.h 50.Ft int 51.Fn ishexnumber "int c" 52.Ft int 53.Fn ishexnumber_l "int c" "locale_t locale" 54.Sh DESCRIPTION 55The 56.Fn isxdigit 57and 58.Fn isxdigit_l 59functions test for any hexadecimal-digit character. 60Regardless of locale, this includes the following characters only: 61.Bl -column \&``0''______ \&``0''______ \&``0''______ \&``0''______ \&``0''______ 62.It "\&``0''" Ta "``1''" Ta "``2''" Ta "``3''" Ta "``4''" 63.It "\&``5''" Ta "``6''" Ta "``7''" Ta "``8''" Ta "``9''" 64.It "\&``A''" Ta "``B''" Ta "``C''" Ta "``D''" Ta "``E''" 65.It "\&``F''" Ta "``a''" Ta "``b''" Ta "``c''" Ta "``d''" 66.It "\&``e''" Ta "``f''" Ta \& Ta \& Ta \& 67.El 68.Pp 69The 70.Fn ishexnumber 71and 72.Fn ishexnumber_l 73functions behave similarly to 74.Fn isxdigit 75and 76.Fn isxdigit_l , 77but may recognize additional characters, 78depending on the current locale setting. 79.Pp 80The value of the argument must be representable as an 81.Vt "unsigned char" 82or the value of 83.Dv EOF . 84.Pp 85The _l-suffixed versions take an explicit 86.Fa locale 87argument, whereas the 88non-suffixed versions use the current global or per-thread locale. 89.Sh RETURN VALUES 90The 91.Fn isxdigit , 92.Fn isxdigit_l , 93.Fn ishexnumber , 94and 95.Fn ishexnumber_l 96functions return zero if the character tests false and 97returns non-zero if the character tests true. 98.Sh COMPATIBILITY 99The 100.Bx 4.4 101extension of accepting arguments outside of the range of the 102.Vt "unsigned char" 103type in locales with large character sets is considered obsolete 104and may not be supported in future releases. 105The 106.Fn iswxdigit , 107.Fn iswxdigit_l , 108.Fn iswhexnumber , 109and 110.Fn iswhexnumber_l 111functions should be used instead. 112.Sh SEE ALSO 113.Xr ctype 3 , 114.Xr ctype_l 3 , 115.Xr iswxdigit 3 , 116.Xr iswxdigit_l 3 , 117.Xr xlocale 3 , 118.Xr ascii 7 119.Sh STANDARDS 120The 121.Fn isxdigit 122function conforms to 123.St -isoC . 124The 125.Fn isxdigit_l 126function conforms to 127.St -p1003.1-2008 . 128.Sh HISTORY 129The 130.Fn ishexnumber 131function appeared in 132.Bx 4.4 . 133