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@(#)iscntrl.3 8.1 (Berkeley) 6/4/93
$FreeBSD: src/lib/libc/locale/iscntrl.3,v 1.22 2009/09/04 07:44:58 des Exp $
.Dd July 17, 2005 .Dt ISCNTRL 3 .Os .Sh NAME .Nm iscntrl .Nd control character test .Sh LIBRARY .Lb libc .Sh SYNOPSIS n ctype.h .Ft int .Fn iscntrl "int c" .Sh DESCRIPTION The .Fn iscntrl function tests for any control character. The value of the argument must be representable as an .Vt "unsigned char" or the value of .Dv EOF .
p In the ASCII character set, this includes the following characters (preceded by their numeric values, in octal):
p l -column 000_``0''__ 000_``0''__ 000_``0''__ 000_``0''__ 000_``0''__ t "000 NUL \t001 SOH \t002 STX \t003 ETX \t004 EOT" t "005 ENQ \t006 ACK \t007 BEL \t010 BS \t011 HT" t "012 NL \t013 VT \t014 NP \t015 CR \t016 SO" t "017 SI \t020 DLE \t021 DC1 \t022 DC2 \t023 DC3" t "024 DC4 \t025 NAK \t026 SYN \t027 ETB \t030 CAN" t "031 EM \t032 SUB \t033 ESC \t034 FS \t035 GS" t "036 RS \t037 US \t177 DEL" .El .Sh RETURN VALUES The .Fn iscntrl function returns zero if the character tests false and returns non-zero if the character tests true. .Sh COMPATIBILITY The x 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 iswcntrl function should be used instead. .Sh SEE ALSO .Xr ctype 3 , .Xr isalnum_l 3 , .Xr iswcntrl 3 , .Xr ascii 7 .Sh STANDARDS The .Fn iscntrl function conforms to .St -isoC .