wcswidth - determine columns needed for a fixed-size wide character
string
#include <wchar.h>
int wcswidth (const wchar_t *s, size_t n);
The wcswidth function returns the number of columns needed to represent
the wide-character string pointed to by s, but at most n wide characters.
If a non-printable wide character occurs among these characters,
-1 is returned.
The wcswidth function returns the number of column positions for the
wide-character string s, truncated to at most length n.
UNIX98
wcwidth(3), iswprint(3)
The behaviour of wcswidth depends on the LC_CTYPE category of the current
locale.
GNU 1999-07-25 WCSWIDTH(3)
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