wcwidth

       #define _XOPEN_SOURCE       /* See feature_test_macros(7) */
       #include <wchar.h>

       int wcwidth(wchar_t c);

DESCRIPTION
       The  wcwidth()  function returns the number of columns needed to repre-
       sent the wide character c.  If c is a  printable  wide  character,  the
       value is at least 0.  If c is null wide character (L'\0'), the value is
       0.  Otherwise, -1 is returned.

RETURN VALUE
       The wcwidth() function returns the number of column positions for c.

ATTRIBUTES
       For  an  explanation  of  the  terms  used   in   this   section,   see
       attributes(7).

       +----------+---------------+----------------+
       |Interface | Attribute     | Value          |
       +----------+---------------+----------------+
       |wcwidth() | Thread safety | MT-Safe locale |
       +----------+---------------+----------------+
CONFORMING TO
       POSIX.1-2001, POSIX.1-2008.

       Note that glibc before 2.2.5 used the prototype
       int wcwidth(wint_t c);

NOTES
       The  behavior of wcwidth() depends on the LC_CTYPE category of the cur-
       rent locale.

SEE ALSO
       iswprint(3), wcswidth(3)

COLOPHON
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GNU                               2015-08-08                        WCWIDTH(3)
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