opensolaris man page for wcwidth

wcwidth(3C)						   Standard C Library Functions 					       wcwidth(3C)

NAME
       wcwidth - number of column positions of a wide-character code

SYNOPSIS
       #include <wchar.h>

       int wcwidth(wchar_t wc);

DESCRIPTION
       The  wcwidth()  function  determines the number of column positions required for the wide character wc. The value of wc must be a character
       representable as a wchar_t, and must be a wide-character code corresponding to a valid character in the current locale.

RETURN VALUES
       The wcwidth() function either returns 0 (if wc is a null wide-character code), or returns the number of column positions to be occupied	by
       the wide-character code wc, or returns -1 (if wc does not correspond to a printing wide-character code).

ERRORS
       No errors are defined.

ATTRIBUTES
       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |CSI			     |Enabled			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Standard			   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe with exceptions	   |
       +-----------------------------+-----------------------------+

SEE ALSO
       setlocale(3C), wcswidth(3C), attributes(5), standards(5)

SunOS 5.11							    14 Aug 2002 						       wcwidth(3C)