− test for whitespace wide character
iswspace() function is the wide-character equivalent
of the isspace(3) function. It tests whether
wc is a wide character belonging to the
wide-character class "space".
wide-character class "space" is disjoint from the
wide-character class "graph" and therefore also
disjoint from its subclasses "alnum",
"alpha", "upper", "lower",
wide-character class "space" contains the
wide-character class "blank".
wide-character class "space" always contains at
least the space character and the control characters '\f',
'\n', '\r', '\t', '\v'.
iswspace() function returns nonzero if wc is a
wide character belonging to the wide-character class
"space". Otherwise, it returns zero.
explanation of the terms used in this section, see
The behavior of
iswspace() depends on the LC_CTYPE category of
the current locale.
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