1/*	$NetBSD: bt_get.c,v 1.12 2008/09/10 17:52:35 joerg Exp $	*/
2
3/*-
4 * Copyright (c) 1990, 1993, 1994
5 *	The Regents of the University of California.  All rights reserved.
6 *
7 * This code is derived from software contributed to Berkeley by
8 * Mike Olson.
9 *
10 * Redistribution and use in source and binary forms, with or without
11 * modification, are permitted provided that the following conditions
12 * are met:
13 * 1. Redistributions of source code must retain the above copyright
14 *    notice, this list of conditions and the following disclaimer.
15 * 2. Redistributions in binary form must reproduce the above copyright
16 *    notice, this list of conditions and the following disclaimer in the
17 *    documentation and/or other materials provided with the distribution.
18 * 3. Neither the name of the University nor the names of its contributors
19 *    may be used to endorse or promote products derived from this software
20 *    without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35#if HAVE_NBTOOL_CONFIG_H
36#include "nbtool_config.h"
37#endif
38
39#include <sys/cdefs.h>
40__RCSID("$NetBSD: bt_get.c,v 1.12 2008/09/10 17:52:35 joerg Exp $");
41
42#include "namespace.h"
43#include <sys/types.h>
44
45#include <assert.h>
46#include <errno.h>
47#include <stddef.h>
48#include <stdio.h>
49
50#include <db.h>
51#include "btree.h"
52
53/*
54 * __BT_GET -- Get a record from the btree.
55 *
56 * Parameters:
57 *	dbp:	pointer to access method
58 *	key:	key to find
59 *	data:	data to return
60 *	flag:	currently unused
61 *
62 * Returns:
63 *	RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
64 */
65int
66__bt_get(const DB *dbp, const DBT *key, DBT *data, u_int flags)
67{
68	BTREE *t;
69	EPG *e;
70	int exact, status;
71
72	t = dbp->internal;
73
74	/* Toss any page pinned across calls. */
75	if (t->bt_pinned != NULL) {
76		mpool_put(t->bt_mp, t->bt_pinned, 0);
77		t->bt_pinned = NULL;
78	}
79
80	/* Get currently doesn't take any flags. */
81	if (flags) {
82		errno = EINVAL;
83		return (RET_ERROR);
84	}
85
86	if ((e = __bt_search(t, key, &exact)) == NULL)
87		return (RET_ERROR);
88	if (!exact) {
89		mpool_put(t->bt_mp, e->page, 0);
90		return (RET_SPECIAL);
91	}
92
93	status = __bt_ret(t, e, NULL, NULL, data, &t->bt_rdata, 0);
94
95	/*
96	 * If the user is doing concurrent access, we copied the
97	 * key/data, toss the page.
98	 */
99	if (F_ISSET(t, B_DB_LOCK))
100		mpool_put(t->bt_mp, e->page, 0);
101	else
102		t->bt_pinned = e->page;
103	return (status);
104}
105