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NAME

       iswblank - test for whitespace wide character

SYNOPSIS

       #include <wctype.h>

       int iswblank (wint_t wc);

DESCRIPTION

       The  iswblank  function is the wide-character equivalent of the isblank
       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

       This function is a GNU extension.

SEE ALSO

       isblank(3), iswctype(3)

NOTES

       The behaviour of iswblank depends  on  the  LC_CTYPE  category  of  the
       current locale.