Import BSDDB 4.7.25 (as of svn r89086)
This commit is contained in:
Zachary Ware
499
dbm/dbm.c
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499
dbm/dbm.c
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@@ -0,0 +1,499 @@
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/*-
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* See the file LICENSE for redistribution information.
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*
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* Copyright (c) 1996,2008 Oracle. 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. 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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* $Id: dbm.c 63573 2008-05-23 21:43:21Z trent.nelson $
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*/
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#define DB_DBM_HSEARCH 1
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#include "db_config.h"
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#include "db_int.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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* EXTERN: #if DB_DBM_HSEARCH != 0
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*
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* EXTERN: int __db_ndbm_clearerr __P((DBM *));
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* EXTERN: void __db_ndbm_close __P((DBM *));
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* EXTERN: int __db_ndbm_delete __P((DBM *, datum));
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* EXTERN: int __db_ndbm_dirfno __P((DBM *));
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* EXTERN: int __db_ndbm_error __P((DBM *));
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* EXTERN: datum __db_ndbm_fetch __P((DBM *, datum));
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* EXTERN: datum __db_ndbm_firstkey __P((DBM *));
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* EXTERN: datum __db_ndbm_nextkey __P((DBM *));
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* EXTERN: DBM *__db_ndbm_open __P((const char *, int, int));
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* EXTERN: int __db_ndbm_pagfno __P((DBM *));
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* EXTERN: int __db_ndbm_rdonly __P((DBM *));
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* EXTERN: int __db_ndbm_store __P((DBM *, datum, datum, int));
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*
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* EXTERN: int __db_dbm_close __P((void));
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* EXTERN: int __db_dbm_delete __P((datum));
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* EXTERN: datum __db_dbm_fetch __P((datum));
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* EXTERN: datum __db_dbm_firstkey __P((void));
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* EXTERN: int __db_dbm_init __P((char *));
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* EXTERN: datum __db_dbm_nextkey __P((datum));
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* EXTERN: int __db_dbm_store __P((datum, datum));
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*
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* EXTERN: #endif
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*/
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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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dbm_close(__cur_db);
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if ((__cur_db = dbm_open(file, O_CREAT | O_RDWR, DB_MODE_600)) != 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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int
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__db_dbm_close()
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{
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if (__cur_db != NULL) {
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dbm_close(__cur_db);
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__cur_db = NULL;
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}
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return (0);
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}
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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 = NULL;
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item.dsize = 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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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 = NULL;
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item.dsize = 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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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 = NULL;
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item.dsize = 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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int
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__db_dbm_delete(key)
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datum key;
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{
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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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return (dbm_delete(__cur_db, key));
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}
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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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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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return (dbm_store(__cur_db, key, dat, DBM_REPLACE));
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}
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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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DBC *dbc;
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int ret;
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char path[DB_MAXPATHLEN];
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/*
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* !!!
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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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__os_set_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 ((ret = db_create(&dbp, NULL, 0)) != 0) {
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__os_set_errno(ret);
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return (NULL);
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}
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/*
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* !!!
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* The historic ndbm library corrected for opening O_WRONLY.
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*/
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if (oflags & O_WRONLY) {
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oflags &= ~O_WRONLY;
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oflags |= O_RDWR;
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}
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if ((ret = dbp->set_pagesize(dbp, 4096)) != 0 ||
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(ret = dbp->set_h_ffactor(dbp, 40)) != 0 ||
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(ret = dbp->set_h_nelem(dbp, 1)) != 0 ||
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(ret = dbp->open(dbp, NULL,
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path, NULL, DB_HASH, __db_openflags(oflags), mode)) != 0) {
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__os_set_errno(ret);
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return (NULL);
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}
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if ((ret = dbp->cursor(dbp, NULL, &dbc, 0)) != 0) {
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(void)dbp->close(dbp, 0);
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__os_set_errno(ret);
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return (NULL);
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}
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return ((DBM *)dbc);
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}
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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(dbm)
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DBM *dbm;
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{
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DBC *dbc;
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dbc = (DBC *)dbm;
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(void)dbc->dbp->close(dbc->dbp, 0);
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}
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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(dbm, key)
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DBM *dbm;
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datum key;
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{
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DBC *dbc;
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DBT _key, _data;
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datum data;
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int ret;
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dbc = (DBC *)dbm;
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DB_INIT_DBT(_key, key.dptr, key.dsize);
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memset(&_data, 0, sizeof(DBT));
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/*
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* Note that we can't simply use the dbc we have to do a get/SET,
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* because that cursor is the one used for sequential iteration and
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* it has to remain stable in the face of intervening gets and puts.
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*/
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if ((ret = dbc->dbp->get(dbc->dbp, NULL, &_key, &_data, 0)) == 0) {
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data.dptr = _data.data;
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data.dsize = (int)_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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if (ret == DB_NOTFOUND)
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__os_set_errno(ENOENT);
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else {
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__os_set_errno(ret);
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F_SET(dbc->dbp, DB_AM_DBM_ERROR);
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}
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}
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return (data);
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}
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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(dbm)
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DBM *dbm;
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{
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DBC *dbc;
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DBT _key, _data;
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datum key;
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int ret;
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dbc = (DBC *)dbm;
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memset(&_key, 0, sizeof(DBT));
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memset(&_data, 0, sizeof(DBT));
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if ((ret = dbc->get(dbc, &_key, &_data, DB_FIRST)) == 0) {
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key.dptr = _key.data;
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key.dsize = (int)_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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if (ret == DB_NOTFOUND)
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__os_set_errno(ENOENT);
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else {
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__os_set_errno(ret);
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F_SET(dbc->dbp, DB_AM_DBM_ERROR);
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}
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}
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return (key);
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}
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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(dbm)
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DBM *dbm;
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{
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DBC *dbc;
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DBT _key, _data;
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datum key;
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int ret;
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dbc = (DBC *)dbm;
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memset(&_key, 0, sizeof(DBT));
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memset(&_data, 0, sizeof(DBT));
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if ((ret = dbc->get(dbc, &_key, &_data, DB_NEXT)) == 0) {
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key.dptr = _key.data;
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key.dsize = (int)_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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if (ret == DB_NOTFOUND)
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__os_set_errno(ENOENT);
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else {
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__os_set_errno(ret);
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F_SET(dbc->dbp, DB_AM_DBM_ERROR);
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}
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}
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return (key);
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}
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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(dbm, key)
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DBM *dbm;
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datum key;
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{
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DBC *dbc;
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DBT _key;
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int ret;
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dbc = (DBC *)dbm;
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DB_INIT_DBT(_key, key.dptr, key.dsize);
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if ((ret = dbc->dbp->del(dbc->dbp, NULL, &_key, 0)) == 0)
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return (0);
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if (ret == DB_NOTFOUND)
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__os_set_errno(ENOENT);
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else {
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__os_set_errno(ret);
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F_SET(dbc->dbp, DB_AM_DBM_ERROR);
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}
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return (-1);
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}
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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(dbm, key, data, flags)
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DBM *dbm;
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datum key, data;
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int flags;
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{
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DBC *dbc;
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DBT _key, _data;
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int ret;
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dbc = (DBC *)dbm;
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DB_INIT_DBT(_key, key.dptr, key.dsize);
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DB_INIT_DBT(_data, data.dptr, data.dsize);
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if ((ret = dbc->dbp->put(dbc->dbp, 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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__os_set_errno(ret);
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F_SET(dbc->dbp, DB_AM_DBM_ERROR);
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return (-1);
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}
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int
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__db_ndbm_error(dbm)
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DBM *dbm;
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{
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DBC *dbc;
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dbc = (DBC *)dbm;
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return (F_ISSET(dbc->dbp, DB_AM_DBM_ERROR));
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}
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int
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__db_ndbm_clearerr(dbm)
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DBM *dbm;
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{
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DBC *dbc;
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dbc = (DBC *)dbm;
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F_CLR(dbc->dbp, DB_AM_DBM_ERROR);
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return (0);
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}
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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(dbm)
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DBM *dbm;
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{
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DBC *dbc;
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dbc = (DBC *)dbm;
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return (F_ISSET(dbc->dbp, 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(dbm)
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DBM *dbm;
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{
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return (dbm_pagfno(dbm));
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}
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int
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__db_ndbm_pagfno(dbm)
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DBM *dbm;
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{
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DBC *dbc;
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int fd;
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dbc = (DBC *)dbm;
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(void)dbc->dbp->fd(dbc->dbp, &fd);
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return (fd);
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}
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Reference in New Issue
Block a user