1 .\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
3 .\" %%%LICENSE_START(GPLv2+_DOC_ONEPARA)
4 .\" This is free documentation; you can redistribute it and/or
5 .\" modify it under the terms of the GNU General Public License as
6 .\" published by the Free Software Foundation; either version 2 of
7 .\" the License, or (at your option) any later version.
10 .\" References consulted:
11 .\" GNU glibc-2 source code and manual
12 .\" Dinkumware C library reference http://www.dinkumware.com/
13 .\" OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
16 .TH ISWBLANK 3 2016-03-15 "GNU" "Linux Programmer's Manual"
18 iswblank \- test for whitespace wide character
21 .B #include <wctype.h>
23 .BI "int iswblank(wint_t " wc );
27 Feature Test Macro Requirements for glibc (see
28 .BR feature_test_macros (7)):
34 _ISOC99_SOURCE || _POSIX_C_SOURCE\ >=\ 200112L
40 function is the wide-character equivalent of the
43 It tests whether \fIwc\fP is a wide character
44 belonging to the wide-character class "blank".
46 The wide-character class "blank" is a subclass of the wide-character class
49 Being a subclass of the wide-character class "space",
50 the wide-character class "blank" is disjoint from the
51 wide-character class "graph" and therefore also disjoint
52 from its subclasses "alnum", "alpha", "upper", "lower", "digit",
55 The wide-character class "blank" always contains
56 at least the space character
57 and the control character \(aq\et\(aq.
61 function returns nonzero
62 if \fIwc\fP is a wide character
63 belonging to the wide-character class "blank".
64 Otherwise, it returns zero.
66 For an explanation of the terms used in this section, see
72 Interface Attribute Value
75 T} Thread safety MT-Safe locale
78 POSIX.1-2001, POSIX.1-2008.