* errno.cc (errmap): Handle ERROR_BUS_RESET.

	* errno.cc (errmap): Handle ERROR_BUS_RESET.
	* fhandler.h (fhandler_dev_raw::write_file): New method, created
	from former static function.
	(fhandler_dev_raw::read_file): Ditto.
	(reset_devbuf): New inline method.
	(class fhandler_dev_tape): Add TAPE_GET_DRIVE_PARAMETERS
	member `dp'.
	(fhandler_dev_tape::write_file): New method.
	(fhandler_dev_tape::read_file): Ditto.
	(fhandler_dev_tape::tape_get_feature): Convert to inline method.
	(fhandler_dev_tape::tape_error): New method, created from former
	static function.
	(fhandler_dev_tape::tape_get_blocksize): Remove declaration.
	* fhandler_raw.cc (fhandler_dev_raw::write_file): New method, created
	from former static function.
	(fhandler_dev_raw::read_file): Ditto.
	(fhandler_dev_raw::writebuf): Accomodate the fact that no devbuf
	exists under variable block size condition.
	(fhandler_dev_raw::raw_read): Ditto. Add local p pointer to simplify
	pointer arithmetic.
	(fhandler_dev_raw::raw_write): Always set devbufend to 0 when starting
	with writing. Accomodate the fact that no devbuf exists under
	variable block size condition.
	* fhandler_tape.cc: Various formatting changes.
	(TAPE_FUNC): New macro. Use throughout as tape function loop.
	(get_ll): Convert into macro.
	(IS_EOM): New macro.
	(IS_EOF): New macro.
	(fhandler_dev_tape::is_eom): Use IS_EOM macro.
	(fhandler_dev_tape::is_eof): Use IS_EOF macro.
	(fhandler_dev_tape::write_file): New method.
	(fhandler_dev_tape::read_file): New method.
	(fhandler_dev_tape::open): Get drive information block here once.
	(fhandler_dev_tape::lseek): Remove unneeded duplicate code.
	(fhandler_dev_tape::dup): Duplicate drive information block.
	(fhandler_dev_tape::ioctl): Remove drvbuf in variable block size mode.
	Return ERROR_INVALID_BLOCK_LENGTH instead of ERROR_MORE_DATA if
	buffer contains data which would get lost on buffer size changing.
	Use absolute tape positioning also if drive only supports logical
	block positioning.
	(fhandler_dev_tape::tape_error): New method, created from former
	static function.
	(fhandler_dev_tape::tape_get_pos): Allow logical block reporting.
	Workaround tape driver bug.
	(fhandler_dev_tape::_tape_set_pos): Reset device buffer and flags
	after successful repositioning.
	(fhandler_dev_tape::tape_set_pos): Allow logical block positioning.
	Workaround tape driver bug.
	(fhandler_dev_tape::tape_erase): Use dp instead of calling
	GetTapeParameters.
	(fhandler_dev_tape::tape_prepare): Ditto.
	(fhandler_dev_tape::tape_get_blocksize): Remove.
	(fhandler_dev_tape::tape_set_blocksize): Don't call tape_get_blocksize.
	Error handling already done in fhandler_dev_tape::ioctl.
	(fhandler_dev_tape::tape_status): Remove local `dp' variable.
	Accomodate logical tape reporting.  Call tape_get_feature instead
	of accessing feature words directly.
	(fhandler_dev_tape::tape_compression): Use dp instead of calling
	GetTapeParameters.  Fix resetting datcompression.