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Diffstat (limited to 'lib/libc/locale/isxdigit.3')
-rw-r--r-- | lib/libc/locale/isxdigit.3 | 102 |
1 files changed, 102 insertions, 0 deletions
diff --git a/lib/libc/locale/isxdigit.3 b/lib/libc/locale/isxdigit.3 new file mode 100644 index 0000000..1fb54bf --- /dev/null +++ b/lib/libc/locale/isxdigit.3 @@ -0,0 +1,102 @@ +.\" Copyright (c) 1991, 1993 +.\" The Regents of the University of California. All rights reserved. +.\" +.\" This code is derived from software contributed to Berkeley by +.\" the American National Standards Committee X3, on Information +.\" Processing Systems. +.\" +.\" Redistribution and use in source and binary forms, with or without +.\" modification, are permitted provided that the following conditions +.\" are met: +.\" 1. Redistributions of source code must retain the above copyright +.\" notice, this list of conditions and the following disclaimer. +.\" 2. Redistributions in binary form must reproduce the above copyright +.\" notice, this list of conditions and the following disclaimer in the +.\" documentation and/or other materials provided with the distribution. +.\" 4. Neither the name of the University nor the names of its contributors +.\" may be used to endorse or promote products derived from this software +.\" without specific prior written permission. +.\" +.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND +.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE +.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE +.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE +.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL +.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS +.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) +.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT +.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY +.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF +.\" SUCH DAMAGE. +.\" +.\" @(#)isxdigit.3 8.1 (Berkeley) 6/4/93 +.\" $FreeBSD$ +.\" +.Dd July 17, 2005 +.Dt ISXDIGIT 3 +.Os +.Sh NAME +.Nm isxdigit, ishexnumber +.Nd hexadecimal-digit character test +.Sh LIBRARY +.Lb libc +.Sh SYNOPSIS +.In ctype.h +.Ft int +.Fn isxdigit "int c" +.Ft int +.Fn ishexnumber "int c" +.Sh DESCRIPTION +The +.Fn isxdigit +function tests for any hexadecimal-digit character. +Regardless of locale, this includes the following characters only: +.Pp +.Bl -column \&``0''______ \&``0''______ \&``0''______ \&``0''______ \&``0''______ +.It "\&``0''\t``1''\t``2''\t``3''\t``4''" +.It "\&``5''\t``6''\t``7''\t``8''\t``9''" +.It "\&``A''\t``B''\t``C''\t``D''\t``E''" +.It "\&``F''\t``a''\t``b''\t``c''\t``d''" +.It "\&``e''\t``f''" +.El +.Pp +The +.Fn ishexnumber +function behaves similarly to +.Fn isxdigit , +but may recognize additional characters, +depending on the current locale setting. +.Pp +The value of the argument must be representable as an +.Vt "unsigned char" +or the value of +.Dv EOF . +.Sh RETURN VALUES +The +.Fn isxdigit +function returns zero if the character tests false and +returns non-zero if the character tests true. +.Sh COMPATIBILITY +The +.Bx 4.4 +extension of accepting arguments outside of the range of the +.Vt "unsigned char" +type in locales with large character sets is considered obsolete +and may not be supported in future releases. +The +.Fn iswxdigit +function should be used instead. +.Sh SEE ALSO +.Xr ctype 3 , +.Xr iswxdigit 3 , +.Xr ascii 7 +.Sh STANDARDS +The +.Fn isxdigit +function conforms to +.St -isoC . +.Sh HISTORY +The +.Fn ishexnumber +function appeared in +.Bx 4.4 . |