fputws - write a wide character string to a FILE stream
ws, FILE *stream);
The fputws function is the wide-character equivalent
of the fputs function. It writes the wide character
string starting at ws, up to but not including the
terminating L'0' character, to stream.
The fputws function returns a nonnegative integer if
the operation was successful, or -1 to indicate an
ISO/ANSI C, UNIX98
The behaviour of fputws depends on the LC_CTYPE
category of the current locale.
In the absence of additional information passed to the fopen
call, it is reasonable to expect that fputws will
actually write the multibyte string corresponding to the
wide character string ws.