ISWBLANK(3)                         Linux Programmer's Manual                         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():
              _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 sub‐
       classes "alnum", "alpha", "upper", "lower", "digit", "xdigit", "punct".

       The wide-character class "blank" always contains at least the space character and the con‐
       trol 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
   Multithreading (see pthreads(7))
       The iswblank() function is thread-safe with exceptions.  It can be safely used  in  multi‐
       threaded  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 3.74 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 http://www.kernel.org/doc/man-pages/.



GNU                                         2014-02-10                                ISWBLANK(3)