1#pragma ident	"%Z%%M%	%I%	%E% SMI"
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. All advertising materials mentioning features or use of this software
16 *    must display the following acknowledgement:
17 *	This product includes software developed by the University of
18 *	California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 *    may be used to endorse or promote products derived from this software
21 *    without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36#if defined(LIBC_SCCS) && !defined(lint)
37static char sccsid[] = "@(#)rec_utils.c	8.6 (Berkeley) 7/16/94";
38#endif /* LIBC_SCCS and not lint */
39
40#include <sys/param.h>
41
42#include <stdio.h>
43#include <stdlib.h>
44#include <string.h>
45
46#include "db-int.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 */
63int
64__rec_ret(t, e, nrec, key, data)
65	BTREE *t;
66	EPG *e;
67	recno_t nrec;
68	DBT *key, *data;
69{
70	RLEAF *rl;
71	void *p;
72
73	if (key == NULL)
74		goto dataonly;
75
76	/* We have to copy the key, it's not on the page. */
77	if (sizeof(recno_t) > t->bt_rkey.size) {
78		p = (void *)(t->bt_rkey.data == NULL ?
79		    malloc(sizeof(recno_t)) :
80		    realloc(t->bt_rkey.data, sizeof(recno_t)));
81		if (p == NULL)
82			return (RET_ERROR);
83		t->bt_rkey.data = p;
84		t->bt_rkey.size = sizeof(recno_t);
85	}
86	memmove(t->bt_rkey.data, &nrec, sizeof(recno_t));
87	key->size = sizeof(recno_t);
88	key->data = t->bt_rkey.data;
89
90dataonly:
91	if (data == NULL)
92		return (RET_SUCCESS);
93
94	/*
95	 * We must copy big keys/data to make them contigous.  Otherwise,
96	 * leave the page pinned and don't copy unless the user specified
97	 * concurrent access.
98	 */
99	rl = GETRLEAF(e->page, e->index);
100	if (rl->flags & P_BIGDATA) {
101		if (__ovfl_get(t, rl->bytes,
102		    &data->size, &t->bt_rdata.data, &t->bt_rdata.size))
103			return (RET_ERROR);
104		data->data = t->bt_rdata.data;
105	} else if (F_ISSET(t, B_DB_LOCK)) {
106		/* Use +1 in case the first record retrieved is 0 length. */
107		if (rl->dsize + 1 > t->bt_rdata.size) {
108			p = (void *)(t->bt_rdata.data == NULL ?
109			    malloc(rl->dsize + 1) :
110			    realloc(t->bt_rdata.data, rl->dsize + 1));
111			if (p == NULL)
112				return (RET_ERROR);
113			t->bt_rdata.data = p;
114			t->bt_rdata.size = rl->dsize + 1;
115		}
116		memmove(t->bt_rdata.data, rl->bytes, rl->dsize);
117		data->size = rl->dsize;
118		data->data = t->bt_rdata.data;
119	} else {
120		data->size = rl->dsize;
121		data->data = rl->bytes;
122	}
123	return (RET_SUCCESS);
124}
125