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 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