int iswblank(wint_t wc);
Feature Test Macro Requirements for glibc (see feature_test_macros(7)):
- _ISOC99_SOURCE || _POSIX_C_SOURCE >= 200112L
DESCRIPTIONThe 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 VALUEThe iswblank() function returns nonzero if wc is a wide character belonging to the wide-character class "blank". Otherwise, it returns zero.
ATTRIBUTESFor an explanation of the terms used in this section, see attributes(7).
|iswblank()||Thread safety||MT-Safe locale|
CONFORMING TOPOSIX.1-2001, POSIX.1-2008.
NOTESThe behavior of iswblank() depends on the LC_CTYPE category of the current locale.
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