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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 ||
              _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 '	'.

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

   Multithreading (see pthreads(7))
       The  iswblank()  function  is  thread-safe  with exceptions.  It can be
       safely used in multithreaded applications, as long as  setlocale(3)  is
       not called to change the locale during its execution.

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 3.65 of the Linux  man-pages  project.   A
       description  of  the project, and information about reporting bugs, can
       be found at http://www.kernel.org/doc/man-pages/.



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