Manpages - iswblank.3

iswblank - test for whitespace wide character

  #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

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’.

The *iswblank*() function returns nonzero if wc is a wide character belonging to the wide-character class “blank”. Otherwise, it returns zero.

For an explanation of the terms used in this section, see *attributes*(7).

POSIX.1-2001, POSIX.1-2008.

The behavior of iswblank*() depends on the *LC_CTYPE category of the current locale.

*isblank*(3), *iswctype*(3)

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