449 lines
8.9 KiB
C
449 lines
8.9 KiB
C
/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1996, 1997, 1998
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* Sleepycat Software. All rights reserved.
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*/
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/*
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* Copyright (c) 1990, 1993
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* Margo Seltzer. All rights reserved.
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*/
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/*
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* This code is derived from software contributed to Berkeley by
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* Margo Seltzer.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include "config.h"
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#ifndef lint
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static const char sccsid[] = "@(#)dbm.c 10.16 (Sleepycat) 5/7/98";
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#endif /* not lint */
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#ifndef NO_SYSTEM_INCLUDES
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#include <sys/types.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <string.h>
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#endif
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#define DB_DBM_HSEARCH 1
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#include "db_int.h"
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#include "db_page.h"
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#include "hash.h"
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/*
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*
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* This package provides dbm and ndbm compatible interfaces to DB.
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*
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* The DBM routines, which call the NDBM routines.
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*/
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static DBM *__cur_db;
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static void __db_no_open __P((void));
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int
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__db_dbm_init(file)
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char *file;
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{
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if (__cur_db != NULL)
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(void)dbm_close(__cur_db);
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if ((__cur_db =
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dbm_open(file, O_CREAT | O_RDWR, __db_omode("rw----"))) != NULL)
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return (0);
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if ((__cur_db = dbm_open(file, O_RDONLY, 0)) != NULL)
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return (0);
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return (-1);
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}
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weak_alias (__db_dbm_init, dbminit)
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datum
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__db_dbm_fetch(key)
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datum key;
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{
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datum item;
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if (__cur_db == NULL) {
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__db_no_open();
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item.dptr = 0;
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return (item);
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}
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return (dbm_fetch(__cur_db, key));
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}
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weak_alias (__db_dbm_fetch, fetch)
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datum
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__db_dbm_firstkey()
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{
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datum item;
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if (__cur_db == NULL) {
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__db_no_open();
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item.dptr = 0;
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return (item);
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}
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return (dbm_firstkey(__cur_db));
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}
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#undef firstkey
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weak_alias (__db_dbm_firstkey, firstkey)
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datum
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__db_dbm_nextkey(key)
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datum key;
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{
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datum item;
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COMPQUIET(key.dsize, 0);
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if (__cur_db == NULL) {
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__db_no_open();
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item.dptr = 0;
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return (item);
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}
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return (dbm_nextkey(__cur_db));
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}
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weak_alias (__db_dbm_nextkey, nextkey)
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int
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__db_dbm_delete(key)
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datum key;
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{
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int ret;
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if (__cur_db == NULL) {
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__db_no_open();
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return (-1);
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}
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ret = dbm_delete(__cur_db, key);
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if (ret == 0)
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ret = (((DB *)__cur_db)->sync)((DB *)__cur_db, 0);
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return (ret);
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}
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weak_alias (__db_dbm_delete, delete)
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int
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__db_dbm_store(key, dat)
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datum key, dat;
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{
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int ret;
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if (__cur_db == NULL) {
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__db_no_open();
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return (-1);
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}
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ret = dbm_store(__cur_db, key, dat, DBM_REPLACE);
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if (ret == 0)
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ret = (((DB *)__cur_db)->sync)((DB *)__cur_db, 0);
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return (ret);
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}
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weak_alias (__db_dbm_store, store)
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static void
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__db_no_open()
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{
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(void)fprintf(stderr, "dbm: no open database.\n");
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}
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/*
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* This package provides dbm and ndbm compatible interfaces to DB.
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*
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* The NDBM routines, which call the DB routines.
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*/
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/*
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* Returns:
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* *DBM on success
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* NULL on failure
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*/
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DBM *
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__db_ndbm_open(file, oflags, mode)
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const char *file;
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int oflags, mode;
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{
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DB *dbp;
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DB_INFO dbinfo;
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char path[MAXPATHLEN];
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memset(&dbinfo, 0, sizeof(dbinfo));
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dbinfo.db_pagesize = 4096;
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dbinfo.h_ffactor = 40;
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dbinfo.h_nelem = 1;
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/*
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* XXX
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* Don't use sprintf(3)/snprintf(3) -- the former is dangerous, and
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* the latter isn't standard, and we're manipulating strings handed
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* us by the application.
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*/
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if (strlen(file) + strlen(DBM_SUFFIX) + 1 > sizeof(path)) {
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errno = ENAMETOOLONG;
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return (NULL);
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}
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(void)strcpy(path, file);
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(void)strcat(path, DBM_SUFFIX);
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if ((errno = db_open(path,
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DB_HASH, __db_oflags(oflags), mode, NULL, &dbinfo, &dbp)) != 0)
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return (NULL);
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return ((DBM *)dbp);
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}
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weak_alias (__db_ndbm_open, dbm_open)
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/*
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* Returns:
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* Nothing.
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*/
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void
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__db_ndbm_close(db)
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DBM *db;
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{
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(void)db->close(db, 0);
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}
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weak_alias (__db_ndbm_close, dbm_close)
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/*
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* Returns:
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* DATUM on success
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* NULL on failure
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*/
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datum
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__db_ndbm_fetch(db, key)
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DBM *db;
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datum key;
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{
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DBT _key, _data;
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datum data;
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int ret;
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memset(&_key, 0, sizeof(DBT));
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memset(&_data, 0, sizeof(DBT));
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_key.size = key.dsize;
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_key.data = key.dptr;
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if ((ret = db->get((DB *)db, NULL, &_key, &_data, 0)) == 0) {
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data.dptr = _data.data;
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data.dsize = _data.size;
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} else {
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data.dptr = NULL;
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data.dsize = 0;
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__set_errno (ret == DB_NOTFOUND ? ENOENT : ret);
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}
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return (data);
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}
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weak_alias (__db_ndbm_fetch, dbm_fetch)
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/*
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* Returns:
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* DATUM on success
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* NULL on failure
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*/
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datum
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__db_ndbm_firstkey(db)
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DBM *db;
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{
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DBT _key, _data;
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datum key;
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int ret;
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DBC *cp;
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if ((cp = TAILQ_FIRST(&db->curs_queue)) == NULL)
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if ((errno = db->cursor(db, NULL, &cp)) != 0) {
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memset(&key, 0, sizeof(key));
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return (key);
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}
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memset(&_key, 0, sizeof(DBT));
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memset(&_data, 0, sizeof(DBT));
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if ((ret = (cp->c_get)(cp, &_key, &_data, DB_FIRST)) == 0) {
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key.dptr = _key.data;
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key.dsize = _key.size;
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} else {
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key.dptr = NULL;
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key.dsize = 0;
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__set_errno (ret == DB_NOTFOUND ? ENOENT : ret);
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}
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return (key);
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}
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weak_alias (__db_ndbm_firstkey, dbm_firstkey)
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/*
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* Returns:
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* DATUM on success
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* NULL on failure
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*/
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datum
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__db_ndbm_nextkey(db)
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DBM *db;
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{
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DBC *cp;
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DBT _key, _data;
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datum key;
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int ret;
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if ((cp = TAILQ_FIRST(&db->curs_queue)) == NULL)
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if ((errno = db->cursor(db, NULL, &cp)) != 0) {
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memset(&key, 0, sizeof(key));
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return (key);
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}
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memset(&_key, 0, sizeof(DBT));
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memset(&_data, 0, sizeof(DBT));
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if ((ret = (cp->c_get)(cp, &_key, &_data, DB_NEXT)) == 0) {
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key.dptr = _key.data;
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key.dsize = _key.size;
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} else {
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key.dptr = NULL;
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key.dsize = 0;
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__set_errno (ret == DB_NOTFOUND ? ENOENT : ret);
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}
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return (key);
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}
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weak_alias (__db_ndbm_nextkey, dbm_nextkey)
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/*
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* Returns:
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* 0 on success
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* <0 failure
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*/
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int
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__db_ndbm_delete(db, key)
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DBM *db;
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datum key;
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{
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DBT _key;
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int ret;
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memset(&_key, 0, sizeof(DBT));
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_key.data = key.dptr;
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_key.size = key.dsize;
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if ((ret = (((DB *)db)->del)((DB *)db, NULL, &_key, 0)) == 0)
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return (0);
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errno = ret == DB_NOTFOUND ? ENOENT : ret;
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return (-1);
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}
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weak_alias (__db_ndbm_delete, dbm_delete)
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/*
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* Returns:
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* 0 on success
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* <0 failure
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* 1 if DBM_INSERT and entry exists
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*/
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int
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__db_ndbm_store(db, key, data, flags)
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DBM *db;
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datum key, data;
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int flags;
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{
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DBT _key, _data;
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int ret;
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memset(&_key, 0, sizeof(DBT));
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memset(&_data, 0, sizeof(DBT));
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_key.data = key.dptr;
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_key.size = key.dsize;
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_data.data = data.dptr;
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_data.size = data.dsize;
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if ((ret = db->put((DB *)db, NULL,
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&_key, &_data, flags == DBM_INSERT ? DB_NOOVERWRITE : 0)) == 0)
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return (0);
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if (ret == DB_KEYEXIST)
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return (1);
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errno = ret;
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return (-1);
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}
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weak_alias (__db_ndbm_store, dbm_store)
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int
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__db_ndbm_error(db)
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DBM *db;
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{
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HTAB *hp;
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hp = (HTAB *)db->internal;
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return (hp->local_errno);
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}
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weak_alias (__db_ndbm_error, dbm_error)
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int
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__db_ndbm_clearerr(db)
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DBM *db;
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{
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HTAB *hp;
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hp = (HTAB *)db->internal;
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hp->local_errno = 0;
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return (0);
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}
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weak_alias (__db_ndbm_clearerr, dbm_clearerr)
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/*
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* Returns:
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* 1 if read-only
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* 0 if not read-only
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*/
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int
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__db_ndbm_rdonly(db)
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DBM *db;
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{
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return (F_ISSET((DB *)db, DB_AM_RDONLY) ? 1 : 0);
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}
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/*
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* XXX
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* We only have a single file descriptor that we can return, not two. Return
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* the same one for both files. Hopefully, the user is using it for locking
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* and picked one to use at random.
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*/
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int
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__db_ndbm_dirfno(db)
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DBM *db;
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{
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int fd;
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(void)db->fd(db, &fd);
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return (fd);
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}
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weak_alias (__db_ndbm_dirfno, dbm_dirfno)
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int
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__db_ndbm_pagfno(db)
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DBM *db;
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{
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int fd;
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(void)db->fd(db, &fd);
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return (fd);
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}
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weak_alias (__db_ndbm_pagfno, dbm_pagfno)
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