wcwidth - determine columns needed for a wide character
#include <wchar.h>
int wcwidth (wint_t c);
The wcwidth function returns the number of columns needed to represent
the wide character c. If c is a printable wide character, the value is
at least 0. If c is L'\0', the value is 0. Otherwise -1 is returned.
The wcwidth function returns the number of column positions for c.
UNIX98
wcswidth(3), iswprint(3)
The behaviour of wcwidth depends on the LC_CTYPE category of the current
locale.
GNU 1999-07-25 WCWIDTH(3)
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