libc.info: wcslen

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`wcslen'--get wide-character string length

*Synopsis*
     #include <wchar.h>
     size_t wcslen(const wchar_t *S);
   *Description*
The `wcslen' function computes the number of wide-character codes in
the wide-character string to which S points, not including the
terminating null wide-character code.
*Returns*
The `wcslen' function returns the length of S; no return value is
reserved to indicate an error.
*Portability*
`wcslen' is ISO/IEC 9899/AMD1:1995 (ISO C).  No supporting OS
subroutines are required.