iswblank

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():
           _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
       This page is part of release 5.13 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/.



GNU                                2021-03-22                        ISWBLANK(3)