1 /*- 2 * Copyright (c) 1990, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 */ 33 34 #if defined(LIBC_SCCS) && !defined(lint) 35 static char sccsid[] = "@(#)rec_utils.c 8.6 (Berkeley) 7/16/94"; 36 #endif /* LIBC_SCCS and not lint */ 37 #include <sys/cdefs.h> 38 __FBSDID("$FreeBSD$"); 39 40 #include <sys/param.h> 41 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 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 90 dataonly: 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