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
--- 16 unchanged lines hidden (view full) ---
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.\" @(#)iscntrl.3 8.1 (Berkeley) 6/4/93
33.\" $FreeBSD: head/lib/libc/locale/iscntrl.3 196820 2009-09-04 07:44:58Z des $
34.\"
35.Dd July 17, 2005
36.Dt ISCNTRL 3
37.Os
38.Sh NAME
39.Nm iscntrl
40.Nd control character test
41.Sh LIBRARY
42.Lb libc
43.Sh SYNOPSIS
44.In ctype.h
45.Ft int
46.Fn iscntrl "int c"
47.Sh DESCRIPTION
48The
49.Fn iscntrl
50function tests for any control character.
51The value of the argument must be representable as an
52.Vt "unsigned char"
53or the value of
54.Dv EOF .
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60.It "\&000\ NUL \t001\ SOH \t002\ STX \t003\ ETX \t004\ EOT"
61.It "\&005\ ENQ \t006\ ACK \t007\ BEL \t010\ BS \t011\ HT"
62.It "\&012\ NL \t013\ VT \t014\ NP \t015\ CR \t016\ SO"
63.It "\&017\ SI \t020\ DLE \t021\ DC1 \t022\ DC2 \t023\ DC3"
64.It "\&024\ DC4 \t025\ NAK \t026\ SYN \t027\ ETB \t030\ CAN"
65.It "\&031\ EM \t032\ SUB \t033\ ESC \t034\ FS \t035\ GS"
66.It "\&036\ RS \t037\ US \t177\ DEL"
67.El
68.Sh RETURN VALUES
69The
70.Fn iscntrl
71function returns zero if the character tests false and
72returns non-zero if the character tests true.
73.Sh COMPATIBILITY
74The
75.Bx 4.4
76extension of accepting arguments outside of the range of the
77.Vt "unsigned char"
78type in locales with large character sets is considered obsolete
79and may not be supported in future releases.
80The
81.Fn iswcntrl
82function should be used instead.
83.Sh SEE ALSO
84.Xr ctype 3 ,
85.Xr iswcntrl 3 ,
86.Xr ascii 7
87.Sh STANDARDS
88The
89.Fn iscntrl
90function conforms to
91.St -isoC .
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
--- 16 unchanged lines hidden (view full) ---
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.\" @(#)iscntrl.3 8.1 (Berkeley) 6/4/93
33.\" $FreeBSD: head/lib/libc/locale/iscntrl.3 196820 2009-09-04 07:44:58Z des $
34.\"
35.Dd July 17, 2005
36.Dt ISCNTRL 3
37.Os
38.Sh NAME
39.Nm iscntrl
40.Nd control character test
41.Sh LIBRARY
42.Lb libc
43.Sh SYNOPSIS
44.In ctype.h
45.Ft int
46.Fn iscntrl "int c"
47.Sh DESCRIPTION
48The
49.Fn iscntrl
50function tests for any control character.
51The value of the argument must be representable as an
52.Vt "unsigned char"
53or the value of
54.Dv EOF .
--- 5 unchanged lines hidden (view full) ---
60.It "\&000\ NUL \t001\ SOH \t002\ STX \t003\ ETX \t004\ EOT"
61.It "\&005\ ENQ \t006\ ACK \t007\ BEL \t010\ BS \t011\ HT"
62.It "\&012\ NL \t013\ VT \t014\ NP \t015\ CR \t016\ SO"
63.It "\&017\ SI \t020\ DLE \t021\ DC1 \t022\ DC2 \t023\ DC3"
64.It "\&024\ DC4 \t025\ NAK \t026\ SYN \t027\ ETB \t030\ CAN"
65.It "\&031\ EM \t032\ SUB \t033\ ESC \t034\ FS \t035\ GS"
66.It "\&036\ RS \t037\ US \t177\ DEL"
67.El
68.Sh RETURN VALUES
69The
70.Fn iscntrl
71function returns zero if the character tests false and
72returns non-zero if the character tests true.
73.Sh COMPATIBILITY
74The
75.Bx 4.4
76extension of accepting arguments outside of the range of the
77.Vt "unsigned char"
78type in locales with large character sets is considered obsolete
79and may not be supported in future releases.
80The
81.Fn iswcntrl
82function should be used instead.
83.Sh SEE ALSO
84.Xr ctype 3 ,
85.Xr iswcntrl 3 ,
86.Xr ascii 7
87.Sh STANDARDS
88The
89.Fn iscntrl
90function conforms to
91.St -isoC .