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-
   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.

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
   current locale.

SEE ALSO

   isblank(3), iswctype(3)

COLOPHON

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