Name

iswblank — test for whitespace wide character

Synopsis

#include <wctype.h>
int iswblank( wint_t wc);
 
[Note] Note
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
iswblank():
_XOPEN_SOURCE >= 600 || _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L;
or cc -std=c99

DESCRIPTION

The iswblank() function is the wide-character equivalent of the isblank(3) function. It tests whether wc is a wide character belonging to the wide-character class "blank".

The wide-character class "blank" is a subclass of the wide-character class "space".

Being a subclass of the wide-character class "space", the wide-character class "blank" is disjoint from the wide-character class "graph" and therefore also disjoint from its subclasses "alnum", "alpha", "upper", "lower", "digit", "xdigit", "punct".

The wide-character class "blank" always contains at least the space character and the control character '\t'.

RETURN VALUE

The iswblank() function returns nonzero if wc is a wide character belonging to the wide-character class "blank". Otherwise it returns zero.

CONFORMING TO

POSIX.1-2001.

NOTES

The behavior of iswblank() depends on the LC_CTYPE category of the current locale.

SEE ALSO

isblank(3), iswctype(3)

COLOPHON

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  Copyright (c) Bruno Haible <haibleclisp.cons.org>

This is free documentation; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of
the License, or (at your option) any later version.

References consulted:
  GNU glibc-2 source code and manual
  Dinkumware C library reference http://www.dinkumware.com/
  OpenGroup's Single UNIX specification http://www.UNIX-systems.org/online.html
  ISO/IEC 9899:1999