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 #include <sys/param.h>
33
34 #include <stdio.h>
35 #include <stdlib.h>
36 #include <string.h>
37
38 #include <db.h>
39 #include "recno.h"
40
41 /*
42 * __rec_ret --
43 * Build return data.
44 *
45 * Parameters:
46 * t: tree
47 * e: key/data pair to be returned
48 * nrec: record number
49 * key: user's key structure
50 * data: user's data structure
51 *
52 * Returns:
53 * RET_SUCCESS, RET_ERROR.
54 */
55 int
__rec_ret(BTREE * t,EPG * e,recno_t nrec,DBT * key,DBT * data)56 __rec_ret(BTREE *t, EPG *e, recno_t nrec, DBT *key, DBT *data)
57 {
58 RLEAF *rl;
59 void *p;
60
61 if (key == NULL)
62 goto dataonly;
63
64 /* We have to copy the key, it's not on the page. */
65 if (sizeof(recno_t) > t->bt_rkey.size) {
66 p = realloc(t->bt_rkey.data, sizeof(recno_t));
67 if (p == NULL)
68 return (RET_ERROR);
69 t->bt_rkey.data = p;
70 t->bt_rkey.size = sizeof(recno_t);
71 }
72 memmove(t->bt_rkey.data, &nrec, sizeof(recno_t));
73 key->size = sizeof(recno_t);
74 key->data = t->bt_rkey.data;
75
76 dataonly:
77 if (data == NULL)
78 return (RET_SUCCESS);
79
80 /*
81 * We must copy big keys/data to make them contigous. Otherwise,
82 * leave the page pinned and don't copy unless the user specified
83 * concurrent access.
84 */
85 rl = GETRLEAF(e->page, e->index);
86 if (rl->flags & P_BIGDATA) {
87 if (__ovfl_get(t, rl->bytes,
88 &data->size, &t->bt_rdata.data, &t->bt_rdata.size))
89 return (RET_ERROR);
90 data->data = t->bt_rdata.data;
91 } else if (F_ISSET(t, B_DB_LOCK)) {
92 /* Use +1 in case the first record retrieved is 0 length. */
93 if (rl->dsize + 1 > t->bt_rdata.size) {
94 p = realloc(t->bt_rdata.data, rl->dsize + 1);
95 if (p == NULL)
96 return (RET_ERROR);
97 t->bt_rdata.data = p;
98 t->bt_rdata.size = rl->dsize + 1;
99 }
100 memmove(t->bt_rdata.data, rl->bytes, rl->dsize);
101 data->size = rl->dsize;
102 data->data = t->bt_rdata.data;
103 } else {
104 data->size = rl->dsize;
105 data->data = rl->bytes;
106 }
107 return (RET_SUCCESS);
108 }
109