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  dis‐
       joint 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)

GNU                                                                            2021-03-22                                                                    ISWBLANK(3)