CentOS 7.0 - man page for iswprint (centos section 3)
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ISWPRINT(3) Linux Programmer's Manual ISWPRINT(3)
iswprint - test for printing wide character
int iswprint(wint_t wc);
The iswprint() function is the wide-character equivalent of the isprint(3) function. It
tests whether wc is a wide character belonging to the wide-character class "print".
The wide-character class "print" is disjoint from the wide-character class "cntrl".
The wide-character class "print" contains the wide-character class "graph".
The iswprint() function returns nonzero if wc is a wide character belonging to the wide-
character class "print". Otherwise it returns zero.
The behavior of iswprint() depends on the LC_CTYPE category of the current locale.
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GNU 1999-07-25 ISWPRINT(3)
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