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Linux 2.6 - man page for wcwidth (linux section 3)

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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 charac-
       ter 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
   Multithreading (see pthreads(7))
       The  wcwidth()  function  is thread-safe with exceptions.  It can be safely used in multi-
       threaded applications, as long as setlocale(3) is not called to change the locale.

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 3.55 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					    2013-11-04				       WCWIDTH(3)
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