109 lines
3.1 KiB
C
109 lines
3.1 KiB
C
/* $NetBSD: bt_get.c,v 1.13 2008/09/11 12:58:00 joerg Exp $ */
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/*-
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* Copyright (c) 1990, 1993, 1994
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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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* Mike Olson.
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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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#if HAVE_NBTOOL_CONFIG_H
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#include "nbtool_config.h"
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#endif
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#include <sys/cdefs.h>
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#ifndef __minix
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__RCSID("$NetBSD: bt_get.c,v 1.13 2008/09/11 12:58:00 joerg Exp $");
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#endif
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#ifndef __minix
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#include "namespace.h"
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#endif
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#include <sys/types.h>
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#include <assert.h>
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#include <errno.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <db.h>
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#include "btree.h"
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/*
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* __BT_GET -- Get a record from the btree.
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*
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* Parameters:
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* dbp: pointer to access method
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* key: key to find
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* data: data to return
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* flag: currently unused
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*
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* Returns:
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* RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
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*/
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int
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__bt_get(const DB *dbp, const DBT *key, DBT *data, u_int flags)
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{
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BTREE *t;
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EPG *e;
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int exact, status;
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t = dbp->internal;
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/* Toss any page pinned across calls. */
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if (t->bt_pinned != NULL) {
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mpool_put(t->bt_mp, t->bt_pinned, 0);
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t->bt_pinned = NULL;
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}
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/* Get currently doesn't take any flags. */
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if (flags) {
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errno = EINVAL;
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return (RET_ERROR);
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}
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if ((e = __bt_search(t, key, &exact)) == NULL)
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return (RET_ERROR);
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if (!exact) {
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mpool_put(t->bt_mp, e->page, 0);
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return (RET_SPECIAL);
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}
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status = __bt_ret(t, e, NULL, NULL, data, &t->bt_rdata, 0);
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/*
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* If the user is doing concurrent access, we copied the
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* key/data, toss the page.
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*/
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if (F_ISSET(t, B_DB_LOCK))
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mpool_put(t->bt_mp, e->page, 0);
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else
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t->bt_pinned = e->page;
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return (status);
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}
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