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 */ 63int 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 84dataonly: 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