xfree86 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.

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 current locale.

SEE ALSO
       iswprint(3), wcswidth(3)

COLOPHON
       This page is part of release 4.15 of the Linux man-pages project.  A description of the project, information about reporting bugs, and  the
       latest version of this page, can be found at https://www.kernel.org/doc/man-pages/.

GNU
								    2017-09-15								WCWIDTH(3)