iswprint - test for printing wide character
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.
POSIX.1-2001, POSIX.1-2008, C99.
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