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96 lines
3.4 KiB
Groff
96 lines
3.4 KiB
Groff
.\" Copyright (c) 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" This code is derived from software contributed to Berkeley by
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.\" the American National Standards Committee X3, on Information
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.\" Processing Systems.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)iscntrl.3 8.1 (Berkeley) 6/4/93
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.\" $FreeBSD$
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.\"
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.Dd July 17, 2005
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.Dt ISCNTRL 3
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.Os
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.Sh NAME
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.Nm iscntrl
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.Nd control character test
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.Sh LIBRARY
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.Lb libc
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.Sh SYNOPSIS
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.In ctype.h
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.Ft int
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.Fn iscntrl "int c"
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.Sh DESCRIPTION
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The
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.Fn iscntrl
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function tests for any control character.
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The value of the argument must be representable as an
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.Vt unsigned char
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or the value of
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.Dv EOF .
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.Pp
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In the ASCII character set, this includes the following characters
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(with their numeric values shown in octal):
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.Pp
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.Bl -column \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__ \&000_``0''__
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.It "\&000\ NUL \t001\ SOH \t002\ STX \t003\ ETX \t004\ EOT"
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.It "\&005\ ENQ \t006\ ACK \t007\ BEL \t010\ BS \t011\ HT"
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.It "\&012\ NL \t013\ VT \t014\ NP \t015\ CR \t016\ SO"
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.It "\&017\ SI \t020\ DLE \t021\ DC1 \t022\ DC2 \t023\ DC3"
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.It "\&024\ DC4 \t025\ NAK \t026\ SYN \t027\ ETB \t030\ CAN"
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.It "\&031\ EM \t032\ SUB \t033\ ESC \t034\ FS \t035\ GS"
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.It "\&036\ RS \t037\ US \t177\ DEL"
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.El
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.Sh RETURN VALUES
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The
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.Fn iscntrl
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function returns zero if the character tests false and
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returns non-zero if the character tests true.
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.Sh COMPATIBILITY
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The
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.Bx 4.4
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extension of accepting arguments outside of the range of the
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.Vt "unsigned char"
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type in locales with large character sets is considered obsolete
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and may not be supported in future releases.
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The
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.Fn iswcntrl
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function should be used instead.
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.Sh SEE ALSO
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.Xr ctype 3 ,
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.Xr iswcntrl 3 ,
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.Xr ascii 7
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.Sh STANDARDS
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The
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.Fn iscntrl
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function conforms to
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.St -isoC .
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