1 /* $NetBSD: rec_utils.c,v 1.12 2008/09/10 17:52:36 joerg 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 1.12 2008/09/10 17:52:36 joerg 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 */ 63 int 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(recno_t) > t->bt_rkey.size) { 74 p = (void *)(t->bt_rkey.data == NULL ? 75 malloc(sizeof(recno_t)) : 76 realloc(t->bt_rkey.data, sizeof(recno_t))); 77 if (p == NULL) 78 return (RET_ERROR); 79 t->bt_rkey.data = p; 80 t->bt_rkey.size = sizeof(recno_t); 81 } 82 memmove(t->bt_rkey.data, &nrec, sizeof(recno_t)); 83 key->size = sizeof(recno_t); 84 key->data = t->bt_rkey.data; 85 86 dataonly: 87 if (data == NULL) 88 return (RET_SUCCESS); 89 90 /* 91 * We must copy big keys/data to make them contigous. Otherwise, 92 * leave the page pinned and don't copy unless the user specified 93 * concurrent access. 94 */ 95 rl = GETRLEAF(e->page, e->index); 96 if (rl->flags & P_BIGDATA) { 97 if (__ovfl_get(t, rl->bytes, 98 &data->size, &t->bt_rdata.data, &t->bt_rdata.size)) 99 return (RET_ERROR); 100 data->data = t->bt_rdata.data; 101 } else if (F_ISSET(t, B_DB_LOCK)) { 102 /* Use +1 in case the first record retrieved is 0 length. */ 103 if (rl->dsize + 1 > t->bt_rdata.size) { 104 p = (void *)(t->bt_rdata.data == NULL ? 105 malloc(rl->dsize + 1) : 106 realloc(t->bt_rdata.data, rl->dsize + 1)); 107 if (p == NULL) 108 return (RET_ERROR); 109 t->bt_rdata.data = p; 110 t->bt_rdata.size = rl->dsize + 1; 111 } 112 memmove(t->bt_rdata.data, rl->bytes, rl->dsize); 113 data->size = rl->dsize; 114 data->data = t->bt_rdata.data; 115 } else { 116 data->size = rl->dsize; 117 data->data = rl->bytes; 118 } 119 return (RET_SUCCESS); 120 } 121