1/*-
2 * SPDX-License-Identifier: BSD-3-Clause
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 defined(LIBC_SCCS) && !defined(lint)
36static char sccsid[] = "@(#)bt_get.c	8.6 (Berkeley) 7/20/94";
37#endif /* LIBC_SCCS and not lint */
38#include <sys/cdefs.h>
39__FBSDID("$FreeBSD$");
40
41#include <sys/types.h>
42
43#include <errno.h>
44#include <stddef.h>
45#include <stdio.h>
46
47#include <db.h>
48#include "btree.h"
49
50/*
51 * __BT_GET -- Get a record from the btree.
52 *
53 * Parameters:
54 *	dbp:	pointer to access method
55 *	key:	key to find
56 *	data:	data to return
57 *	flag:	currently unused
58 *
59 * Returns:
60 *	RET_ERROR, RET_SUCCESS and RET_SPECIAL if the key not found.
61 */
62int
63__bt_get(const DB *dbp, const DBT *key, DBT *data, u_int flags)
64{
65	BTREE *t;
66	EPG *e;
67	int exact, status;
68
69	t = dbp->internal;
70
71	/* Toss any page pinned across calls. */
72	if (t->bt_pinned != NULL) {
73		mpool_put(t->bt_mp, t->bt_pinned, 0);
74		t->bt_pinned = NULL;
75	}
76
77	/* Get currently doesn't take any flags. */
78	if (flags) {
79		errno = EINVAL;
80		return (RET_ERROR);
81	}
82
83	if ((e = __bt_search(t, key, &exact)) == NULL)
84		return (RET_ERROR);
85	if (!exact) {
86		mpool_put(t->bt_mp, e->page, 0);
87		return (RET_SPECIAL);
88	}
89
90	status = __bt_ret(t, e, NULL, NULL, data, &t->bt_rdata, 0);
91
92	/*
93	 * If the user is doing concurrent access, we copied the
94	 * key/data, toss the page.
95	 */
96	if (F_ISSET(t, B_DB_LOCK))
97		mpool_put(t->bt_mp, e->page, 0);
98	else
99		t->bt_pinned = e->page;
100	return (status);
101}
102