Commit | Line | Data |
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3b3806ff | 1 | /* ndbm.h 4.5 85/01/09 */ |
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2 | |
3 | /* | |
2a683113 | 4 | * Hashed key data base library. |
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5 | */ |
6 | #define PBLKSIZ 1024 | |
7 | #define DBLKSIZ 4096 | |
8 | ||
9 | typedef struct { | |
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10 | int dbm_dirf; /* open directory file */ |
11 | int dbm_pagf; /* open page file */ | |
12 | int dbm_flags; /* flags, see below */ | |
13 | long dbm_maxbno; /* last ``bit'' in dir file */ | |
14 | long dbm_bitno; /* current bit number */ | |
15 | long dbm_hmask; /* hash mask */ | |
16 | long dbm_blkptr; /* current block for dbm_nextkey */ | |
17 | int dbm_keyptr; /* current key for dbm_nextkey */ | |
18 | long dbm_blkno; /* current page to read/write */ | |
19 | long dbm_pagbno; /* current page in pagbuf */ | |
20 | char dbm_pagbuf[PBLKSIZ]; /* page file block buffer */ | |
21 | long dbm_dirbno; /* current block in dirbuf */ | |
22 | char dbm_dirbuf[DBLKSIZ]; /* directory file block buffer */ | |
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23 | } DBM; |
24 | ||
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25 | #define _DBM_RDONLY 0x1 /* data base open read-only */ |
26 | #define _DBM_IOERR 0x2 /* data base I/O error */ | |
27 | ||
28 | #define dbm_rdonly(db) ((db)->dbm_flags & _DBM_RDONLY) | |
29 | ||
30 | #define dbm_error(db) ((db)->dbm_flags & _DBM_IOERR) | |
31 | /* use this one at your own risk! */ | |
32 | #define dbm_clearerr(db) ((db)->dbm_flags &= ~_DBM_IOERR) | |
d1e097f8 | 33 | |
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34 | /* for flock(2) and fstat(2) */ |
35 | #define dbm_dirfno(db) ((db)->dbm_dirf) | |
36 | #define dbm_pagfno(db) ((db)->dbm_pagf) | |
37 | ||
d1e097f8 | 38 | typedef struct { |
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39 | char *dptr; |
40 | int dsize; | |
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41 | } datum; |
42 | ||
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43 | /* |
44 | * flags to dbm_store() | |
45 | */ | |
46 | #define DBM_INSERT 0 | |
47 | #define DBM_REPLACE 1 | |
d1e097f8 | 48 | |
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49 | DBM *dbm_open(); |
50 | void dbm_close(); | |
51 | datum dbm_fetch(); | |
52 | datum dbm_firstkey(); | |
53 | datum dbm_nextkey(); | |
54 | long dbm_forder(); | |
55 | int dbm_delete(); | |
56 | int dbm_store(); |