wcwidth - get number of column positions of wide character code

Syntax	#include <wchar.h> int wcwidth(wint_t wc);
Description	wcwidth() determines the number of column positions required for the wide character wc. The value of wc must be a character representable as a wchar_t, and must be a wide character code corresponding to a valid character in the current locale.
Return val.	-1 0 1	if wc does not correspond to a representable wide character code. if wc is a null wide-character code. if wc corresponds to a representable wide character code.
Notes	Restriction This version of the C runtime system only supports 1-byte characters as wide character codes. They are of type wchar_t (see stddef.h). (End)
See also	wchar.h.