/* $Copyright:	$
 * Copyright (c) 1984, 1985, 1986, 1987, 1988, 1989, 1990 
 * Sequent Computer Systems, Inc.   All rights reserved.
 *  
 * This software is furnished under a license and may be used
 * only in accordance with the terms of that license and with the
 * inclusion of the above copyright notice.   This software may not
 * be provided or otherwise made available to, or used by, any
 * other person.  No title to or ownership of the software is
 * hereby transferred.
 */

/*
 * Copyright (c) 1983 Regents of the University of California.
 * All rights reserved.  The Berkeley software License Agreement
 * specifies the terms and conditions for redistribution.
 *
 *	@(#)ndbm.h	5.1 (Berkeley) 5/30/85
 */

#ident	"$Header: ndbm.h 1.4 89/10/10 $"

#ifndef	_NDBM_H_

/*
 * Hashed key data base library.
 */
#define PBLKSIZ 1024
#define DBLKSIZ 4096

typedef struct {
	int	dbm_dirf;		/* open directory file */
	int	dbm_pagf;		/* open page file */
	int	dbm_flags;		/* flags, see below */
	long	dbm_maxbno;		/* last ``bit'' in dir file */
	long	dbm_bitno;		/* current bit number */
	long	dbm_hmask;		/* hash mask */
	long	dbm_blkptr;		/* current block for dbm_nextkey */
	int	dbm_keyptr;		/* current key for dbm_nextkey */
	long	dbm_blkno;		/* current page to read/write */
	long	dbm_pagbno;		/* current page in pagbuf */
	char	dbm_pagbuf[PBLKSIZ];	/* page file block buffer */
	long	dbm_dirbno;		/* current block in dirbuf */
	char	dbm_dirbuf[DBLKSIZ];	/* directory file block buffer */
} DBM;

#define _DBM_RDONLY	0x1	/* data base open read-only */
#define _DBM_IOERR	0x2	/* data base I/O error */

#define dbm_rdonly(db)	((db)->dbm_flags & _DBM_RDONLY)

#define dbm_error(db)	((db)->dbm_flags & _DBM_IOERR)
	/* use this one at your own risk! */
#define dbm_clearerr(db)	((db)->dbm_flags &= ~_DBM_IOERR)

/* for flock(2) and fstat(2) */
#define dbm_dirfno(db)	((db)->dbm_dirf)
#define dbm_pagfno(db)	((db)->dbm_pagf)

typedef struct {
	char	*dptr;
	int	dsize;
} datum;

/*
 * flags to dbm_store()
 */
#define DBM_INSERT	0
#define DBM_REPLACE	1

DBM	*dbm_open();
void	dbm_close();
datum	dbm_fetch();
datum	dbm_firstkey();
datum	dbm_nextkey();
long	dbm_forder();
int	dbm_delete();
int	dbm_store();
void	dbm_blkflush();

#define	_NDBM_H_
#endif	/* _NDBM_H_ */
