Section (3) iswblank
iswblank — test for whitespace wide character
iswblank() function is
the wide-character equivalent of the isblank(3) function. It
wc is a
wide character belonging to the wide-character class
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 _zsingle_quotesz_ _zsingle_quotesz_.
returns nonzero if
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).
||Thread safety||MT-Safe locale|
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OpenGroup_zsingle_quotesz_s Single UNIX specification http://www.UNIX-systems.org/online.html