xref: /freebsd/lib/libc/locale/isspace.3 (revision 145992504973bd16cf3518af9ba5ce185fefa82a)
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
9.\" modification, are permitted provided that the following conditions
10.\" are met:
11.\" 1. Redistributions of source code must retain the above copyright
12.\"    notice, this list of conditions and the following disclaimer.
13.\" 2. Redistributions in binary form must reproduce the above copyright
14.\"    notice, this list of conditions and the following disclaimer in the
15.\"    documentation and/or other materials provided with the distribution.
16.\" 4. Neither the name of the University nor the names of its contributors
17.\"    may be used to endorse or promote products derived from this software
18.\"    without specific prior written permission.
19.\"
20.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\"     @(#)isspace.3	8.1 (Berkeley) 6/4/93
33.\" $FreeBSD$
34.\"
35.Dd July 30, 2012
36.Dt ISSPACE 3
37.Os
38.Sh NAME
39.Nm isspace
40.Nd white-space character test
41.Sh LIBRARY
42.Lb libc
43.Sh SYNOPSIS
44.In ctype.h
45.Ft int
46.Fn isspace "int c"
47.Ft int
48.Fn isspace_l "int c" "locale_t loc"
49.Sh DESCRIPTION
50The
51.Fn isspace
52function tests for white-space characters.
53For any locale, this includes the following standard characters:
54.Bl -column \&`\et''___ \&``\et''___ \&``\et''___ \&``\et''___ \&``\et''___ \&``\et''___
55.It "\&``\et''" Ta "``\en''" Ta "``\ev''" Ta "``\ef''" Ta "``\er''" Ta "`` ''"
56.El
57.Pp
58In the "C" locale,
59.Fn isspace
60returns non-zero for these characters only.
61The value of the argument must be representable as an
62.Vt "unsigned char"
63or the value of
64.Dv EOF .
65.Pp
66The
67.Fn isspace_l
68function takes an explicit locale argument, whereas the
69.Fn isspace
70function uses the current global or per-thread locale.
71.Sh RETURN VALUES
72The
73.Fn isspace
74and
75.Fn isspace_l
76functions return zero if the character tests false and
77return non-zero if the character tests true.
78.Sh COMPATIBILITY
79The
80.Bx 4.4
81extension of accepting arguments outside of the range of the
82.Vt "unsigned char"
83type in locales with large character sets is considered obsolete
84and may not be supported in future releases.
85The
86.Fn iswspace
87function should be used instead.
88.Sh SEE ALSO
89.Xr ctype 3 ,
90.Xr iswspace 3 ,
91.Xr multibyte 3 ,
92.Xr ascii 7
93.Sh STANDARDS
94The
95.Fn isspace
96function conforms to
97.St -isoC .
98The
99.Fn isspace_l
100function conforms to
101.St -p1003.1-2008 .
102