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ISWBLANK(3)		   Linux Programmer's Manual		   ISWBLANK(3)

NAME
       iswblank - test for whitespace wide character

SYNOPSIS
       #include <wctype.h>

       int iswblank(wint_t wc);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       iswblank():
	      _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L

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-charac‐
       ter 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.

ATTRIBUTES
       For  an	explanation  of	 the  terms  used   in	 this	section,   see
       attributes(7).

       ┌───────────┬───────────────┬────────────────┐
       │Interface  │ Attribute	   │ Value	    │
       ├───────────┼───────────────┼────────────────┤
       │iswblank() │ Thread safety │ MT-Safe locale │
       └───────────┴───────────────┴────────────────┘
CONFORMING TO
       POSIX.1-2001, POSIX.1-2008.

NOTES
       The behavior of iswblank() depends on the LC_CTYPE category of the cur‐
       rent locale.

SEE ALSO
       isblank(3), iswctype(3)

COLOPHON
       This page is part of release 4.14 of the Linux  man-pages  project.   A
       description  of	the project, information about reporting bugs, and the
       latest	 version    of	  this	  page,	   can	   be	  found	    at
       https://www.kernel.org/doc/man-pages/.

GNU				  2016-03-15			   ISWBLANK(3)
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