iswcntrl—control wide character test #include <wctype.h>
int iswcntrl(wint_t c);
Description
iswcntrl is a function which classifies wide-character values that
are categorized as control characters.
Returns
iswcntrl returns non-zero if c is a control wide character.
Portability
iswcntrl is C99.
No supporting OS subroutines are required.