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- /*
- * Copyright (c) 1985 The Regents of the University of California.
- * All rights reserved.
- *
- * Redistribution and use in source and binary forms are permitted
- * provided that the above copyright notice and this paragraph are
- * duplicated in all such forms and that any documentation,
- * advertising materials, and other materials related to such
- * distribution and use acknowledge that the software was developed
- * by the University of California, Berkeley. The name of the
- * University may not be used to endorse or promote products derived
- * from this software without specific prior written permission.
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
- * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
- * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
- */
-
- #ifndef lint
- static char sccsid[] = "@(#)dbm.c 5.4 (Berkeley) 5/24/89";
- #endif /* not lint */
-
- #include "dbm.h"
-
- #define NODB ((DBM *)0)
-
- static DBM *cur_db = NODB;
-
- static char no_db[] = "dbm: no open database\n";
-
- dbminit(file)
- char *file;
- {
- if (cur_db != NODB)
- dbm_close(cur_db);
-
- cur_db = dbm_open(file, 2, 0);
- if (cur_db == NODB) {
- cur_db = dbm_open(file, 0, 0);
- if (cur_db == NODB)
- return (-1);
- }
- return (0);
- }
-
- long
- forder(key)
- datum key;
- {
- if (cur_db == NODB) {
- printf(no_db);
- return (0L);
- }
- return (dbm_forder(cur_db, key));
- }
-
- datum
- fetch(key)
- datum key;
- {
- datum item;
-
- if (cur_db == NODB) {
- printf(no_db);
- item.dptr = 0;
- return (item);
- }
- return (dbm_fetch(cur_db, key));
- }
-
- delete(key)
- datum key;
- {
- if (cur_db == NODB) {
- printf(no_db);
- return (-1);
- }
- if (dbm_rdonly(cur_db))
- return (-1);
- return (dbm_delete(cur_db, key));
- }
-
- store(key, dat)
- datum key, dat;
- {
- if (cur_db == NODB) {
- printf(no_db);
- return (-1);
- }
- if (dbm_rdonly(cur_db))
- return (-1);
-
- return (dbm_store(cur_db, key, dat, DBM_REPLACE));
- }
-
- datum
- firstkey()
- {
- datum item;
-
- if (cur_db == NODB) {
- printf(no_db);
- item.dptr = 0;
- return (item);
- }
- return (dbm_firstkey(cur_db));
- }
-
- datum
- nextkey(key)
- datum key;
- {
- datum item;
-
- if (cur_db == NODB) {
- printf(no_db);
- item.dptr = 0;
- return (item);
- }
- return (dbm_nextkey(cur_db, key));
- }
-