Reads the next character from a specified file, and converts it
    to a wide-character code.

    Format

      #include  <wchar.h>

      wint_t fgetwc  (FILE *file_ptr);

1 - Argument

 file_ptr

    A pointer to the file to be accessed.

2 - Description

    Upon successful completion, the fgetwc function returns the wide-
    character code read from the file pointed to by file_ptr and
    converted to type wint_t. If the file is at end-of-file, the
    end-of-file indicator is set, and WEOF is returned. If an I/O
    read error occurred, then the error indicator is set, and WEOF is
    returned.

    Applications can use ferror or feof to distinguish between an
    error condition and an end-of-file condition.

3 - Return Values

    x                  The wide-character code of the character read.
    WEOF               Indicates the end-of-file or an error. If a
                       read error occurs, the function sets errno to
                       one of the following:

                       o  EALREADY - An operation is already in
                          progress on the same file.

                       o  EBADF - The file descriptor is not valid.

                       o  EILSEQ - Invalid character detected.