#ifndef	h_MTU
#define	h_MTU
/******************************************************************************
*
*	Definition of MAGtape unit block
*
*	Module	%M%	Version	%I% 	Date	%H%
*
*	(c) Copyright 1998 Ardent Software Inc. - All Rights Reserved
*	This is unpublished proprietary source code of Ardent Software Inc.
*	The copyright notice above does not evidence any actual or intented
*	publication of such source code.
*
*******************************************************************************
*
*	Maintenence log - insert most recent change descriptions at top
*
*	Date.... GTAR# WHO Description.........................................
*	10/14/98 23801 SAP Change copyrights. 
*	06/20/96 18667 JJV Added filemark type to MTfile structure for NT.
*	05/24/96 18456 JJV Added ALIGNNUM macro for MIPS NT tape handling.
*	02/27/96 17917 JJV Added NT account restore event object defines
*	01/29/96 17720 JJV Added NT tape handling support
*	02/22/95 15740 JC  Addition of NLS map information to tape structure
*	12/15/88 5549  Fix block size problem on NCR tape drives       
*	09/30/88 5343  GPS Default tape functionalities.
*	07/27/88 5190  GPS Floppy implementation on 386 based systems.
*	07/25/88   -    -  Maintenence log purged at 5.2.1, see release 5.1.10.
*
*****************************************************************************/

#include	"MFILE.h"
#include	"NLS.h"

#define	Mchannels	8
#define	FALSE	0
#define	TRUE	1

#ifdef MSWIN
/* These are the event objects used on NT for account restore */
#define	EVENT_START_RESTORE	"startChild"
#define	EVENT_DATA_REQUEST	"dataRequest"
#define	EVENT_KILL_RESTORE	"killRestore"
#endif


struct	mtblock
{
	MFILE	*file;
#ifdef MSWIN
	HANDLE	hDev;
	DWORD	fmark_type;
#endif
	int blksiz;
	char	tapetyp;
	char	*rewdev;
	/* lblfmt    - label format type depending on m/c
	   lblwritn  - set TRUE if label has already been written
	   lblexpct  - set to TRUE if a label is expected to be read 
	*/
	short	reelno,lblfmt,lblwritn,lblexpct;
	/* Dtapetyp is C or T depending on Cartridge or Magnetic tape; used
	   only for generalized tape support.
	   writeat - Drive allows writing at loadpoint(L),after eof(E),or
		     anywhere (A). Field 13 from &DEVICE& file.
           eofagain - After reading eof next read returns an eof(Y),
		      next read reutrns next record(N).
			Field 14 from &DEVICE& file.
	   closefwd - In read mode when the file is closed file pointer
		      goes forward to the beginning of next file (Y),
		      File ptr stays in the same position(N).
			Field 15 from &DEVICE& file.
	*/
	char Dtapetyp,writeat,eofagain,closefwd;
	STRING  lbheader,lbfname;
	STRING  mapname;  /* to hold the device mapname */
	CMAP    *ipmap;   /* Input map pointer */
	CMAP    *opmap;   /* Output map pointer */
};

EXTERN	MTU	MTfile[];

#ifdef MSWIN
EXTERN	STRING	MTread( int, int * );
EXTERN	int	MTwtlabel( int, STRING, STRING, short);
EXTERN	int	MTrdlabel( int, STRING *, STRING *, STRING *, int *, int* );
EXTERN	int	MTmode( int *, int *, int );
EXTERN	int	MTwrite( int, STRING );
EXTERN	int	MTfwdfil( int, int );
EXTERN	int	MTfwdrec( int, int );
EXTERN	int	MTbckrec( int, int );
EXTERN	int	MTbckfil( int, int );
EXTERN	HANDLE	MTopen( MFILE *, char *, int );
EXTERN	void	MTclose( HANDLE * );
EXTERN	int	MTsetup(HANDLE, unsigned long, char, BOOL, DWORD *);
EXTERN	int	MTrewind( int );
EXTERN	int	MTunload( int );
EXTERN	int	MTweof( int, int );
EXTERN	int	MTstatus( int );
#else
EXTERN	STRING	MTread();
EXTERN	int	MTwtlabel();
EXTERN	int	MTrdlabel();
#endif

EXTERN	int	MTblkctr;
EXTERN	int	MTfilctr;
EXTERN	int	MToldblk;
/* MTbufsiz  (max buf size),gets set to Tbufsiz or Cbufsiz in assign.c */
/* Tbufsiz for Magnetic tape  and Cbufsiz for cartridge tapes are defined
	in hardware.h */
EXTERN	int	MTbufsiz;

#define	MTdmpbuf	8192
#define MTbufmin	16
#define MTflhdr		12

#ifdef MSWIN
/* Define buffer re-alignment macro for use by MIPS platforms */
#define	ALIGNNUM(num, base, size)	((((num) + size-1) & ~(size-1)) + (base))
#endif


#if	MT_sysv == 5	/*	Encore		*/
struct ENC_mt_cntl {	
		int first_op;	
		char *orig_file_p;
	};
#endif

#endif	/* end of MTU.h */