#define _XOPEN_SOURCE /* See feature_test_macros(7) */
int wcswidth(const wchar_t *s, size_t n);
The wcswidth() function returns the number of columns needed to repre-
sent the wide-character string pointed to by s, but at most n wide
characters. If a nonprintable wide character occurs among these char-
acters, -1 is returned.
The wcswidth() function returns the number of column positions for the
wide-character string s, truncated to at most length n.
The behavior of wcswidth() depends on the LC_CTYPE category of the cur-
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