Synopsis:

        sys_fhwritebuf(file_handle,buf_handle,num_bytes)

Arguments:

        file_handle       -  The file handle to write tom

        buf_handle       - The buffer handle of the buffer to write the data from

        num_bytes        - The number of bytes to write.

Description:    This function attempts to write num_bytes bytes to the given file_handle from the specified.       The buf_handle is a handle to a 1Kbyte buffer returned from a call to sys_bufuse().     

The maximum number of bytes that can be written is 1024 (the maximum size of a buffer).

Return Value

Returns the number of bytes actually written or a negative error code.