Provided by: manpages-dev_3.24-1ubuntu1_all
wcwidth - determine columns needed for a wide character
int wcwidth(wchar_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
The wcwidth() function returns the number of column positions for c.
Note that glibc before 2.2.5 used the prototype
int wcwidth(wint_t c);
The behavior of wcwidth() depends on the LC_CTYPE category of the
iswprint(3), wcswidth(3), feature_test_macros(7)
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be found at http://www.kernel.org/doc/man-pages/.