1.\" Copyright (c) 1991, 1993
2.\" The Regents of the University of California. All rights reserved.
3.\"
4.\" Redistribution and use in source and binary forms, with or without
5.\" modification, are permitted provided that the following conditions
6.\" are met:
7.\" 1. Redistributions of source code must retain the above copyright
8.\" notice, this list of conditions and the following disclaimer.
--- 12 unchanged lines hidden (view full) ---
21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26.\" SUCH DAMAGE.
27.\"
28.\" @(#)isblank.3 8.1 (Berkeley) 6/4/93
29.\" $FreeBSD: stable/9/lib/libc/locale/isblank.3 207943 2010-05-11 23:08:38Z uqs $
30.\"
31.Dd July 17, 2005
32.Dt ISBLANK 3
33.Os
34.Sh NAME
35.Nm isblank
36.Nd space or tab character test
37.Sh LIBRARY
38.Lb libc
39.Sh SYNOPSIS
40.In ctype.h
41.Ft int
42.Fn isblank "int c"
43.Sh DESCRIPTION
44The
45.Fn isblank
46function tests for a space or tab character.
47For any locale, this includes the following standard characters:
48.Bl -column XXXX
49.It Do \et Dc Ta Dq " "
50.El
51.Pp
52In the "C" locale, a successful
53.Fn isblank
54test is limited to these characters only.
55The value of the argument must be representable as an
56.Vt "unsigned char"
57or the value of
58.Dv EOF .
59.Sh RETURN VALUES
60The
61.Fn isblank
62function returns zero if the character tests false and
63returns non-zero if the character tests true.
64.Sh COMPATIBILITY
65The
66.Bx 4.4
67extension of accepting arguments outside of the range of the
68.Vt "unsigned char"
69type in locales with large character sets is considered obsolete
70and may not be supported in future releases.
71The
72.Fn iswblank
73function should be used instead.
74.Sh SEE ALSO
75.Xr ctype 3 ,
76.Xr iswblank 3 ,
77.Xr ascii 7
78.Sh STANDARDS
79The
80.Fn isblank
81function
82conforms to
83.St -isoC-99 .
2.\" The Regents of the University of California. All rights reserved.
3.\"
4.\" Redistribution and use in source and binary forms, with or without
5.\" modification, are permitted provided that the following conditions
6.\" are met:
7.\" 1. Redistributions of source code must retain the above copyright
8.\" notice, this list of conditions and the following disclaimer.
--- 12 unchanged lines hidden (view full) ---
21.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
22.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
23.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
24.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
25.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
26.\" SUCH DAMAGE.
27.\"
28.\" @(#)isblank.3 8.1 (Berkeley) 6/4/93
29.\" $FreeBSD: stable/9/lib/libc/locale/isblank.3 207943 2010-05-11 23:08:38Z uqs $
30.\"
31.Dd July 17, 2005
32.Dt ISBLANK 3
33.Os
34.Sh NAME
35.Nm isblank
36.Nd space or tab character test
37.Sh LIBRARY
38.Lb libc
39.Sh SYNOPSIS
40.In ctype.h
41.Ft int
42.Fn isblank "int c"
43.Sh DESCRIPTION
44The
45.Fn isblank
46function tests for a space or tab character.
47For any locale, this includes the following standard characters:
48.Bl -column XXXX
49.It Do \et Dc Ta Dq " "
50.El
51.Pp
52In the "C" locale, a successful
53.Fn isblank
54test is limited to these characters only.
55The value of the argument must be representable as an
56.Vt "unsigned char"
57or the value of
58.Dv EOF .
59.Sh RETURN VALUES
60The
61.Fn isblank
62function returns zero if the character tests false and
63returns non-zero if the character tests true.
64.Sh COMPATIBILITY
65The
66.Bx 4.4
67extension of accepting arguments outside of the range of the
68.Vt "unsigned char"
69type in locales with large character sets is considered obsolete
70and may not be supported in future releases.
71The
72.Fn iswblank
73function should be used instead.
74.Sh SEE ALSO
75.Xr ctype 3 ,
76.Xr iswblank 3 ,
77.Xr ascii 7
78.Sh STANDARDS
79The
80.Fn isblank
81function
82conforms to
83.St -isoC-99 .