#include <wchar.h> int wcwidth(wchar_t wc);
The wcwidth() function 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.
The wcwidth() function either returns 0 (if wc is a null wide-character code), or returns the number of column positions to be occupied by the wide-character code wc, or returns −1 (if wc does not correspond to a printing wide-character code).
No errors are defined.
See attributes(5) for descriptions of the following attributes: