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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(): _XOPEN_SOURCE >= 600 || _ISOC99_SOURCE; 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 non-zero 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
       This  page  is part of release 3.22 of the Linux man-pages project.  A description of the project, and informa-
       tion about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.



GNU                               2007-07-26                       ISWBLANK(3)