| 1 | /* |
| 2 | * Copyright (c) 1983 Regents of the University of California. |
| 3 | * All rights reserved. The Berkeley software License Agreement |
| 4 | * specifies the terms and conditions for redistribution. |
| 5 | * |
| 6 | * @(#)ndbm.h 5.1 (Berkeley) %G% |
| 7 | */ |
| 8 | |
| 9 | /* |
| 10 | * Hashed key data base library. |
| 11 | */ |
| 12 | #define PBLKSIZ 1024 |
| 13 | #define DBLKSIZ 4096 |
| 14 | |
| 15 | typedef struct { |
| 16 | int dbm_dirf; /* open directory file */ |
| 17 | int dbm_pagf; /* open page file */ |
| 18 | int dbm_flags; /* flags, see below */ |
| 19 | long dbm_maxbno; /* last ``bit'' in dir file */ |
| 20 | long dbm_bitno; /* current bit number */ |
| 21 | long dbm_hmask; /* hash mask */ |
| 22 | long dbm_blkptr; /* current block for dbm_nextkey */ |
| 23 | int dbm_keyptr; /* current key for dbm_nextkey */ |
| 24 | long dbm_blkno; /* current page to read/write */ |
| 25 | long dbm_pagbno; /* current page in pagbuf */ |
| 26 | char dbm_pagbuf[PBLKSIZ]; /* page file block buffer */ |
| 27 | long dbm_dirbno; /* current block in dirbuf */ |
| 28 | char dbm_dirbuf[DBLKSIZ]; /* directory file block buffer */ |
| 29 | } DBM; |
| 30 | |
| 31 | #define _DBM_RDONLY 0x1 /* data base open read-only */ |
| 32 | #define _DBM_IOERR 0x2 /* data base I/O error */ |
| 33 | |
| 34 | #define dbm_rdonly(db) ((db)->dbm_flags & _DBM_RDONLY) |
| 35 | |
| 36 | #define dbm_error(db) ((db)->dbm_flags & _DBM_IOERR) |
| 37 | /* use this one at your own risk! */ |
| 38 | #define dbm_clearerr(db) ((db)->dbm_flags &= ~_DBM_IOERR) |
| 39 | |
| 40 | /* for flock(2) and fstat(2) */ |
| 41 | #define dbm_dirfno(db) ((db)->dbm_dirf) |
| 42 | #define dbm_pagfno(db) ((db)->dbm_pagf) |
| 43 | |
| 44 | typedef struct { |
| 45 | char *dptr; |
| 46 | int dsize; |
| 47 | } datum; |
| 48 | |
| 49 | /* |
| 50 | * flags to dbm_store() |
| 51 | */ |
| 52 | #define DBM_INSERT 0 |
| 53 | #define DBM_REPLACE 1 |
| 54 | |
| 55 | DBM *dbm_open(); |
| 56 | void dbm_close(); |
| 57 | datum dbm_fetch(); |
| 58 | datum dbm_firstkey(); |
| 59 | datum dbm_nextkey(); |
| 60 | long dbm_forder(); |
| 61 | int dbm_delete(); |
| 62 | int dbm_store(); |