ISWBLANK(3)               (2019-03-06)                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 aq\taq.

     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).     allbox;    lb    lb    lb    l    l    l.
          Interface Attribute Value    T{    iswblank()    T}   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

     Page 1                         GNU              (printed 5/17/22)

     ISWBLANK(3)               (2019-03-06)                ISWBLANK(3)

          isblank(3), iswctype(3)

     COLOPHON
          This page is part of release 5.10  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 https://www.kernel.org/doc/man-pages/.

     Page 2                         GNU              (printed 5/17/22)