projects / unix-history / blame
| Commit | Line | Data |
|---|---|---|
| fea1cabb JB |
1 | /* |
| 2 | * Copyright (c) 1980 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 | ||
| 06c51eed | 7 | #ifndef lint |
| ac2e7cc8 | 8 | static char sccsid[] = "@(#)dbm.c 5.3 (Berkeley) 85/08/15"; |
| fea1cabb | 9 | #endif not lint |
| 06c51eed RE |
10 | |
| 11 | #include "dbm.h" | |
| 12 | ||
| 13 | #define NODB ((DBM *)0) | |
| 14 | ||
| 15 | static DBM *cur_db = NODB; | |
| 16 | ||
| 17 | static char no_db[] = "dbm: no open database\n"; | |
| 18 | ||
| 19 | dbminit(file) | |
| 20 | char *file; | |
| 21 | { | |
| 22 | if (cur_db != NODB) | |
| 23 | dbm_close(cur_db); | |
| 24 | ||
| 25 | cur_db = dbm_open(file, 2, 0); | |
| 26 | if (cur_db == NODB) { | |
| 27 | cur_db = dbm_open(file, 0, 0); | |
| ac2e7cc8 RE |
28 | if (cur_db == NODB) |
| 29 | return (-1); | |
| 06c51eed RE |
30 | } |
| 31 | return (0); | |
| 32 | } | |
| 33 | ||
| 34 | long | |
| 35 | forder(key) | |
| 36 | datum key; | |
| 37 | { | |
| 38 | if (cur_db == NODB) { | |
| 39 | printf(no_db); | |
| 40 | return (0L); | |
| 41 | } | |
| 42 | return (dbm_forder(cur_db, key)); | |
| 43 | } | |
| 44 | ||
| 45 | datum | |
| 46 | fetch(key) | |
| 47 | datum key; | |
| 48 | { | |
| 49 | datum item; | |
| 50 | ||
| 51 | if (cur_db == NODB) { | |
| 52 | printf(no_db); | |
| 53 | item.dptr = 0; | |
| 54 | return (item); | |
| 55 | } | |
| 56 | return (dbm_fetch(cur_db, key)); | |
| 57 | } | |
| 58 | ||
| 59 | delete(key) | |
| 60 | datum key; | |
| 61 | { | |
| 62 | if (cur_db == NODB) { | |
| 63 | printf(no_db); | |
| 64 | return (-1); | |
| 65 | } | |
| 66 | if (dbm_rdonly(cur_db)) | |
| 67 | return (-1); | |
| 68 | return (dbm_delete(cur_db, key)); | |
| 69 | } | |
| 70 | ||
| 71 | store(key, dat) | |
| 72 | datum key, dat; | |
| 73 | { | |
| 74 | if (cur_db == NODB) { | |
| 75 | printf(no_db); | |
| 76 | return (-1); | |
| 77 | } | |
| 78 | if (dbm_rdonly(cur_db)) | |
| 79 | return (-1); | |
| 80 | ||
| 81 | return (dbm_store(cur_db, key, dat, DBM_REPLACE)); | |
| 82 | } | |
| 83 | ||
| 84 | datum | |
| 85 | firstkey() | |
| 86 | { | |
| 87 | datum item; | |
| 88 | ||
| 89 | if (cur_db == NODB) { | |
| 90 | printf(no_db); | |
| 91 | item.dptr = 0; | |
| 92 | return (item); | |
| 93 | } | |
| 94 | return (dbm_firstkey(cur_db)); | |
| 95 | } | |
| 96 | ||
| 97 | datum | |
| 98 | nextkey(key) | |
| 99 | datum key; | |
| 100 | { | |
| 101 | datum item; | |
| 102 | ||
| 103 | if (cur_db == NODB) { | |
| 104 | printf(no_db); | |
| 105 | item.dptr = 0; | |
| 106 | return (item); | |
| 107 | } | |
| 108 | return (dbm_nextkey(cur_db, key)); | |
| 109 | } |