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 #if defined(LIBC_SCCS) && !defined(lint) 33 static char sccsid[] = "@(#)rec_utils.c 8.6 (Berkeley) 7/16/94"; 34 #endif /* LIBC_SCCS and not lint */ 35 #include <sys/cdefs.h> 36 __FBSDID("$FreeBSD$"); 37 38 #include <sys/param.h> 39 40 #include <stdio.h> 41 #include <stdlib.h> 42 #include <string.h> 43 44 #include <db.h> 45 #include "recno.h" 46 47 /* 48 * __rec_ret -- 49 * Build return data. 50 * 51 * Parameters: 52 * t: tree 53 * e: key/data pair to be returned 54 * nrec: record number 55 * key: user's key structure 56 * data: user's data structure 57 * 58 * Returns: 59 * RET_SUCCESS, RET_ERROR. 60 */ 61 int 62 __rec_ret(BTREE *t, EPG *e, recno_t nrec, DBT *key, DBT *data) 63 { 64 RLEAF *rl; 65 void *p; 66 67 if (key == NULL) 68 goto dataonly; 69 70 /* We have to copy the key, it's not on the page. */ 71 if (sizeof(recno_t) > t->bt_rkey.size) { 72 p = realloc(t->bt_rkey.data, sizeof(recno_t)); 73 if (p == NULL) 74 return (RET_ERROR); 75 t->bt_rkey.data = p; 76 t->bt_rkey.size = sizeof(recno_t); 77 } 78 memmove(t->bt_rkey.data, &nrec, sizeof(recno_t)); 79 key->size = sizeof(recno_t); 80 key->data = t->bt_rkey.data; 81 82 dataonly: 83 if (data == NULL) 84 return (RET_SUCCESS); 85 86 /* 87 * We must copy big keys/data to make them contigous. Otherwise, 88 * leave the page pinned and don't copy unless the user specified 89 * concurrent access. 90 */ 91 rl = GETRLEAF(e->page, e->index); 92 if (rl->flags & P_BIGDATA) { 93 if (__ovfl_get(t, rl->bytes, 94 &data->size, &t->bt_rdata.data, &t->bt_rdata.size)) 95 return (RET_ERROR); 96 data->data = t->bt_rdata.data; 97 } else if (F_ISSET(t, B_DB_LOCK)) { 98 /* Use +1 in case the first record retrieved is 0 length. */ 99 if (rl->dsize + 1 > t->bt_rdata.size) { 100 p = realloc(t->bt_rdata.data, rl->dsize + 1); 101 if (p == NULL) 102 return (RET_ERROR); 103 t->bt_rdata.data = p; 104 t->bt_rdata.size = rl->dsize + 1; 105 } 106 memmove(t->bt_rdata.data, rl->bytes, rl->dsize); 107 data->size = rl->dsize; 108 data->data = t->bt_rdata.data; 109 } else { 110 data->size = rl->dsize; 111 data->data = rl->bytes; 112 } 113 return (RET_SUCCESS); 114 } 115