1/*	$OpenBSD: bt_get.c,v 1.8 2005/08/05 13:02:59 espie 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#include <sys/types.h>
36
37#include <errno.h>
38#include <stddef.h>
39#include <stdio.h>
40
41#include <db.h>
42#include "btree.h"
43
44/*
45 * __BT_GET -- Get a record from the btree.
46 *
47 * Parameters:
48 *	dbp:	pointer to access method
49 *	key:	key to find
50 *	data:	data to return
51 *	flag:	currently unused
52 *
53 * Returns:
54 *	RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
55 */
56int
57__bt_get(const DB *dbp, const DBT *key, DBT *data, u_int flags)
58{
59	BTREE *t;
60	EPG *e;
61	int exact, status;
62
63	t = dbp->internal;
64
65	/* Toss any page pinned across calls. */
66	if (t->bt_pinned != NULL) {
67		mpool_put(t->bt_mp, t->bt_pinned, 0);
68		t->bt_pinned = NULL;
69	}
70
71	/* Get currently doesn't take any flags. */
72	if (flags) {
73		errno = EINVAL;
74		return (RET_ERROR);
75	}
76
77	if ((e = __bt_search(t, key, &exact)) == NULL)
78		return (RET_ERROR);
79	if (!exact) {
80		mpool_put(t->bt_mp, e->page, 0);
81		return (RET_SPECIAL);
82	}
83
84	status = __bt_ret(t, e, NULL, NULL, data, &t->bt_rdata, 0);
85
86	/*
87	 * If the user is doing concurrent access, we copied the
88	 * key/data, toss the page.
89	 */
90	if (F_ISSET(t, B_DB_LOCK))
91		mpool_put(t->bt_mp, e->page, 0);
92	else
93		t->bt_pinned = e->page;
94	return (status);
95}
96