CentOS 7.0 - man page for iswspace (centos section 3)
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ISWSPACE(3) Linux Programmer's Manual ISWSPACE(3)
iswspace - test for whitespace wide character
int iswspace(wint_t wc);
The 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".
The wide-character class "space" is disjoint from the wide-character class "graph" and
therefore also disjoint from its subclasses "alnum", "alpha", "upper", "lower", "digit",
The wide-character class "space" contains the wide-character class "blank".
The wide-character class "space" always contains at least the space character and the con-
trol characters '\f', '\n', '\r', '\t', '\v'.
The iswspace() function returns nonzero if wc is a wide character belonging to the wide-
character class "space". Otherwise it returns zero.
The behavior of iswspace() depends on the LC_CTYPE category of the current locale.
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GNU 1999-07-25 ISWSPACE(3)
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