usr/src/lib/libbc/inc/include/ndbm.h

   1 #pragma ident   "%Z%%M% %I%     %E% SMI"
   2 /*
   3  * Copyright (c) 1983 Regents of the University of California.
   4  * All rights reserved.  The Berkeley software License Agreement
   5  * specifies the terms and conditions for redistribution.
   6  *
   7  */
   8
   9 /*
  10  * Hashed key data base library.
  11  */
  12
  13 #ifndef _ndbm_h
  14 #define _ndbm_h
  15
  16 #define PBLKSIZ 1024
  17 #define DBLKSIZ 4096
  18
  19 typedef struct {
  20         int     dbm_dirf;               /* open directory file */
  21         int     dbm_pagf;               /* open page file */
  22         int     dbm_flags;              /* flags, see below */
  23         long    dbm_maxbno;             /* last ``bit'' in dir file */
  24         long    dbm_bitno;              /* current bit number */
  25         long    dbm_hmask;              /* hash mask */
  26         long    dbm_blkptr;             /* current block for dbm_nextkey */
  27         int     dbm_keyptr;             /* current key for dbm_nextkey */
  28         long    dbm_blkno;              /* current page to read/write */
  29         long    dbm_pagbno;             /* current page in pagbuf */
  30         char    dbm_pagbuf[PBLKSIZ];    /* page file block buffer */
  31         long    dbm_dirbno;             /* current block in dirbuf */
  32         char    dbm_dirbuf[DBLKSIZ];    /* directory file block buffer */
  33 } DBM;
  34
  35 #define _DBM_RDONLY     0x1     /* data base open read-only */
  36 #define _DBM_IOERR      0x2     /* data base I/O error */
  37
  38 #define dbm_rdonly(db)  ((db)->dbm_flags & _DBM_RDONLY)
  39
  40 #define dbm_error(db)   ((db)->dbm_flags & _DBM_IOERR)
  41         /* use this one at your own risk! */
  42 #define dbm_clearerr(db)        ((db)->dbm_flags &= ~_DBM_IOERR)
  43
  44 /* for flock(2) and fstat(2) */
  45 #define dbm_dirfno(db)  ((db)->dbm_dirf)
  46 #define dbm_pagfno(db)  ((db)->dbm_pagf)
  47
  48 typedef struct {
  49         char    *dptr;
  50         int     dsize;
  51 } datum;
  52
  53 /*
  54  * flags to dbm_store()
  55  */
  56 #define DBM_INSERT      0
  57 #define DBM_REPLACE     1
  58
  59 DBM     *dbm_open();
  60 void    dbm_close();
  61 datum   dbm_fetch();
  62 datum   dbm_firstkey();
  63 datum   dbm_nextkey();
  64 datum   dbm_do_nextkey();
  65 long    dbm_forder();
  66 int     dbm_delete();
  67 int     dbm_store();
  68
  69 #endif /*!_ndbm_h*/