iswblank(3)                Library Functions Manual                iswblank(3)

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)

Linux man-pages 6.7               2023-10-31                       iswblank(3)