iswblank - test for whitespace wide character


   #include <wctype.h>

   int iswblank(wint_t wc);

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

          _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L


   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'.


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


   For  an  explanation  of  the  terms  used   in   this   section,   see

   Interface   Attribute      Value          
   iswblank()  Thread safety  MT-Safe locale 


   POSIX.1-2001, POSIX.1-2008.


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


   isblank(3), iswctype(3)


   This page is part of release 4.09 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

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