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 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 *    notice, this list of conditions and the following disclaimer in the
14 *    documentation and/or other materials provided with the distribution.
15 * 3. Neither the name of the University nor the names of its contributors
16 *    may be used to endorse or promote products derived from this software
17 *    without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
22 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * SUCH DAMAGE.
30 */
31
32#if defined(LIBC_SCCS) && !defined(lint)
33static char sccsid[] = "@(#)rec_utils.c	8.6 (Berkeley) 7/16/94";
34#endif /* LIBC_SCCS and not lint */
35#include <sys/cdefs.h>
36__FBSDID("$FreeBSD$");
37
38#include <sys/param.h>
39
40#include <stdio.h>
41#include <stdlib.h>
42#include <string.h>
43
44#include <db.h>
45#include "recno.h"
46
47/*
48 * __rec_ret --
49 *	Build return data.
50 *
51 * Parameters:
52 *	t:	tree
53 *	e:	key/data pair to be returned
54 *   nrec:	record number
55 *    key:	user's key structure
56 *   data:	user's data structure
57 *
58 * Returns:
59 *	RET_SUCCESS, RET_ERROR.
60 */
61int
62__rec_ret(BTREE *t, EPG *e, recno_t nrec, DBT *key, DBT *data)
63{
64	RLEAF *rl;
65	void *p;
66
67	if (key == NULL)
68		goto dataonly;
69
70	/* We have to copy the key, it's not on the page. */
71	if (sizeof(recno_t) > t->bt_rkey.size) {
72		p = realloc(t->bt_rkey.data, sizeof(recno_t));
73		if (p == NULL)
74			return (RET_ERROR);
75		t->bt_rkey.data = p;
76		t->bt_rkey.size = sizeof(recno_t);
77	}
78	memmove(t->bt_rkey.data, &nrec, sizeof(recno_t));
79	key->size = sizeof(recno_t);
80	key->data = t->bt_rkey.data;
81
82dataonly:
83	if (data == NULL)
84		return (RET_SUCCESS);
85
86	/*
87	 * We must copy big keys/data to make them contigous.  Otherwise,
88	 * leave the page pinned and don't copy unless the user specified
89	 * concurrent access.
90	 */
91	rl = GETRLEAF(e->page, e->index);
92	if (rl->flags & P_BIGDATA) {
93		if (__ovfl_get(t, rl->bytes,
94		    &data->size, &t->bt_rdata.data, &t->bt_rdata.size))
95			return (RET_ERROR);
96		data->data = t->bt_rdata.data;
97	} else if (F_ISSET(t, B_DB_LOCK)) {
98		/* Use +1 in case the first record retrieved is 0 length. */
99		if (rl->dsize + 1 > t->bt_rdata.size) {
100			p = realloc(t->bt_rdata.data, rl->dsize + 1);
101			if (p == NULL)
102				return (RET_ERROR);
103			t->bt_rdata.data = p;
104			t->bt_rdata.size = rl->dsize + 1;
105		}
106		memmove(t->bt_rdata.data, rl->bytes, rl->dsize);
107		data->size = rl->dsize;
108		data->data = t->bt_rdata.data;
109	} else {
110		data->size = rl->dsize;
111		data->data = rl->bytes;
112	}
113	return (RET_SUCCESS);
114}
115