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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 | */ | |
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8 | |
9 | /* | |
2a683113 | 10 | * Hashed key data base library. |
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11 | */ |
12 | #define PBLKSIZ 1024 | |
13 | #define DBLKSIZ 4096 | |
14 | ||
15 | typedef struct { | |
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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 */ | |
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29 | } DBM; |
30 | ||
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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) | |
d1e097f8 | 39 | |
3b3806ff S |
40 | /* for flock(2) and fstat(2) */ |
41 | #define dbm_dirfno(db) ((db)->dbm_dirf) | |
42 | #define dbm_pagfno(db) ((db)->dbm_pagf) | |
43 | ||
d1e097f8 | 44 | typedef struct { |
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45 | char *dptr; |
46 | int dsize; | |
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47 | } datum; |
48 | ||
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49 | /* |
50 | * flags to dbm_store() | |
51 | */ | |
52 | #define DBM_INSERT 0 | |
53 | #define DBM_REPLACE 1 | |
d1e097f8 | 54 | |
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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(); |