1 /* $NetBSD: rec_utils.c,v 1.15 2024/05/14 19:00:43 andvar Exp $ */
2
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 HAVE_NBTOOL_CONFIG_H
33 #include "nbtool_config.h"
34 #endif
35
36 #include <sys/cdefs.h>
37 __RCSID("$NetBSD: rec_utils.c,v 1.15 2024/05/14 19:00:43 andvar Exp $");
38
39 #include <sys/param.h>
40
41 #include <assert.h>
42 #include <stdio.h>
43 #include <stdlib.h>
44 #include <string.h>
45
46 #include <db.h>
47 #include "recno.h"
48
49 /*
50 * __rec_ret --
51 * Build return data.
52 *
53 * Parameters:
54 * t: tree
55 * e: key/data pair to be returned
56 * nrec: record number
57 * key: user's key structure
58 * data: user's data structure
59 *
60 * Returns:
61 * RET_SUCCESS, RET_ERROR.
62 */
63 int
__rec_ret(BTREE * t,EPG * e,recno_t nrec,DBT * key,DBT * data)64 __rec_ret(BTREE *t, EPG *e, recno_t nrec, DBT *key, DBT *data)
65 {
66 RLEAF *rl;
67 void *p;
68
69 if (key == NULL)
70 goto dataonly;
71
72 /* We have to copy the key, it's not on the page. */
73 if (sizeof(nrec) > t->bt_rkey.size) {
74 p = realloc(t->bt_rkey.data, sizeof(nrec));
75 if (p == NULL)
76 return (RET_ERROR);
77 t->bt_rkey.data = p;
78 t->bt_rkey.size = sizeof(nrec);
79 }
80 memmove(t->bt_rkey.data, &nrec, sizeof(nrec));
81 key->size = sizeof(nrec);
82 key->data = t->bt_rkey.data;
83
84 dataonly:
85 if (data == NULL)
86 return (RET_SUCCESS);
87
88 /*
89 * We must copy big keys/data to make them contiguous. Otherwise,
90 * leave the page pinned and don't copy unless the user specified
91 * concurrent access.
92 */
93 rl = GETRLEAF(e->page, e->index);
94 if (rl->flags & P_BIGDATA) {
95 if (__ovfl_get(t, rl->bytes,
96 &data->size, &t->bt_rdata.data, &t->bt_rdata.size))
97 return (RET_ERROR);
98 data->data = t->bt_rdata.data;
99 } else if (F_ISSET(t, B_DB_LOCK)) {
100 /* Use +1 in case the first record retrieved is 0 length. */
101 if (rl->dsize + 1 > t->bt_rdata.size) {
102 p = realloc(t->bt_rdata.data, rl->dsize + 1);
103 if (p == NULL)
104 return (RET_ERROR);
105 t->bt_rdata.data = p;
106 t->bt_rdata.size = rl->dsize + 1;
107 }
108 memmove(t->bt_rdata.data, rl->bytes, rl->dsize);
109 data->size = rl->dsize;
110 data->data = t->bt_rdata.data;
111 } else {
112 data->size = rl->dsize;
113 data->data = rl->bytes;
114 }
115 return (RET_SUCCESS);
116 }
117