debian man page for wcwidth

WCWIDTH(3)						     Linux Programmer's Manual							WCWIDTH(3)

NAME
       wcwidth - determine columns needed for a wide character

SYNOPSIS
       #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 represent the wide character c.  If c is a printable wide character, the
       value is at least 0.  If c is null wide character (L''), the value is 0.  Otherwise -1 is returned.

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

CONFORMING TO
       POSIX.1-2001.

       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 current locale.

SEE ALSO
       iswprint(3), wcswidth(3)

COLOPHON
       This page is part of release 3.44 of the Linux man-pages project.  A description of the project, and information about reporting bugs,  can
       be found at http://www.kernel.org/doc/man-pages/.

GNU
								    2011-09-28								WCWIDTH(3)