iswcntrl - Test for control wide character

Definition	#include <wctype.h> int iswcntrl(wint_t wc); iswcntrl tests whether the wide character wc is a control character. Control characters are non-printing characters, typically used for printer control. In all cases, wc is an argument of type wint_t, the value of which must be a wide character code corresponding to a valid character in the current locale or must equal the value of the macro WEOF. If the argument wc has any other value, the behavior is undefined.
Return val.	!= 0 0	wc is a control character. wc is not a control character.
Notes	This version of the C runtime system only supports one-byte characters as wide character codes. iswcntrl is implemented both as a function and as a macro (see section “Functions and macros”). The behavior of iswcntrl is determined by the class cntrl of the current locale. The current locale is the C locale, unless it was explicitly changed using setlocale.
See also	iscntrl, iswalnum, iswalpha, iswdigit, iswgraph, iswlower, iswprint, iswpunct, iswspace, iswupper, iswxdigit, setlocale