usr/include/ndbm.h

/*
 * 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
 */

/*
 * 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();