NAME

       iswblank - test for whitespace wide character

LIBRARY

       Standard C library (libc, -lc)

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 │
       └────────────────────────────────────────────────────────┴───────────────┴────────────────┘

STANDARDS

       POSIX.1-2008.

HISTORY

       POSIX.1-2001.

NOTES

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

SEE ALSO

       isblank(3), iswctype(3)