1.0  Output a binary block
             ______ _ ______ _____



                                   *********
                                   * fputb *
                                   *********


        Usage

                fputb(buffer, maxbytes, lbn, iop);
                char            *buffer;
                int             bufsiz;
                unsigned        lbn;
                FILE            *iop;

        Description

                Write one or more disk blocks  to  the  indicated  file.
                Bufsiz is the buffer size and must be a multiple of 512.
                Lbn is the logical block number to write.

                The block is written by a direct QIO IO.WVB call.   Your
                program  should  only  use  block reads or writes unless
                your very sure of the effect of mixing io types.

                This routine will not extend a file if you specify a lbn
                past the current end of file.  Write to an existing file
                or preallocate the correct size.

                If sucessfull, the actual number  of  bytes  written  is
                returned.   On  error,  the  dsw  or  iosb error code is
                returned.

                Fputb() is not present on Unix standard I/O libraries.

        Bugs

                Only works with RSX.  Lbn should be a long, but  if  you
                need to write more than 65K blocks into a file, you know
                how to fix this routine.