mirror of https://github.com/mkerrisk/man-pages
89 lines
2.3 KiB
Groff
89 lines
2.3 KiB
Groff
.\" Copyright (c) Bruno Haible <haible@clisp.cons.org>
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.\"
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.\" %%%LICENSE_START(GPLv2+_DOC_ONEPARA)
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.\" This is free documentation; you can redistribute it and/or
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.\" modify it under the terms of the GNU General Public License as
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.\" published by the Free Software Foundation; either version 2 of
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.\" the License, or (at your option) any later version.
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.\" %%%LICENSE_END
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.\"
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.\" References consulted:
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.\" GNU glibc-2 source code and manual
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.\" Dinkumware C library reference http://www.dinkumware.com/
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.\" OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
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.\" ISO/IEC 9899:1999
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.\"
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.TH ISWBLANK 3 2014-02-10 "GNU" "Linux Programmer's Manual"
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.SH NAME
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iswblank \- test for whitespace wide character
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.SH SYNOPSIS
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.nf
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.B #include <wctype.h>
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.sp
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.BI "int iswblank(wint_t " wc );
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.fi
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.sp
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.in -4n
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.in
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.sp
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.ad l
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.BR iswblank ():
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.RS
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_XOPEN_SOURCE\ >=\ 600 || _ISOC99_SOURCE ||
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_POSIX_C_SOURCE\ >=\ 200112L;
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.br
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or
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.I cc\ -std=c99
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.RE
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.ad
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.SH DESCRIPTION
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The
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.BR iswblank ()
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function is the wide-character equivalent of the
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.BR isblank (3)
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function.
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It tests whether \fIwc\fP is a wide character
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belonging to the wide-character class "blank".
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.PP
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The wide-character class "blank" is a subclass of the wide-character class
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"space".
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.PP
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Being a subclass of the wide-character class "space",
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the wide-character class "blank" is disjoint from the
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wide-character class "graph" and therefore also disjoint
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from its subclasses "alnum", "alpha", "upper", "lower", "digit",
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"xdigit", "punct".
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.PP
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The wide-character class "blank" always contains
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at least the space character
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and the control character \(aq\\t\(aq.
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.SH RETURN VALUE
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The
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.BR iswblank ()
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function returns nonzero
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if \fIwc\fP is a wide character
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belonging to the wide-character class "blank".
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Otherwise it returns zero.
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.SH ATTRIBUTES
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.SS Multithreading (see pthreads(7))
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The
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.BR iswblank ()
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function is thread-safe with exceptions.
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It can be safely used in multithreaded applications, as long as
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.BR setlocale (3)
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is not called to change the locale during its execution.
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.SH CONFORMING TO
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POSIX.1-2001.
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.SH NOTES
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The behavior of
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.BR iswblank ()
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depends on the
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.B LC_CTYPE
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category of the
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current locale.
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.SH SEE ALSO
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.BR isblank (3),
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.BR iswctype (3)
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