osx man page for wcswidth_l

WCSWIDTH(3)						   BSD Library Functions Manual 					       WCSWIDTH(3)

NAME
     wcswidth, wcswidth_l -- number of column positions in wide-character string

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <wchar.h>

     int
     wcswidth(const wchar_t *pwcs, size_t n);

     #include <wchar.h>
     #include <xlocale.h>

     int
     wcswidth_l(const wchar_t *pwcs, size_t n, locale_t loc);

DESCRIPTION
     The wcswidth() function determines the number of column positions required for the first n characters of pwcs, or until a null wide character
     (L'') is encountered.

     Although the wcswidth() function uses the current locale, the wcswidth_l() function may be passed a locale directly. See xlocale(3) for more
     information.

RETURN VALUES
     The wcswidth() function returns 0 if pwcs is an empty string (L""), -1 if a non-printing wide character is encountered; otherwise, it returns
     the number of column positions occupied.

SEE ALSO
     iswprint(3), wcwidth(3), xlocale(3)

STANDARDS
     The wcswidth() function conforms to IEEE Std 1003.1-2001 (``POSIX.1'').

BSD
								  August 20, 2002							       BSD