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 #ifndef __minix 38 __RCSID("$NetBSD: rec_utils.c,v 1.12 2008/09/10 17:52:36 joerg Exp $"); 39 #endif 40 41 #include <sys/param.h> 42 43 #include <assert.h> 44 #include <stdio.h> 45 #include <stdlib.h> 46 #include <string.h> 47 48 #include <db.h> 49 #include "recno.h" 50 51 /* 52 * __rec_ret -- 53 * Build return data. 54 * 55 * Parameters: 56 * t: tree 57 * e: key/data pair to be returned 58 * nrec: record number 59 * key: user's key structure 60 * data: user's data structure 61 * 62 * Returns: 63 * RET_SUCCESS, RET_ERROR. 64 */ 65 int 66 __rec_ret(BTREE *t, EPG *e, recno_t nrec, DBT *key, DBT *data) 67 { 68 RLEAF *rl; 69 void *p; 70 71 if (key == NULL) 72 goto dataonly; 73 74 /* We have to copy the key, it's not on the page. */ 75 if (sizeof(recno_t) > t->bt_rkey.size) { 76 p = (void *)(t->bt_rkey.data == NULL ? 77 malloc(sizeof(recno_t)) : 78 realloc(t->bt_rkey.data, sizeof(recno_t))); 79 if (p == NULL) 80 return (RET_ERROR); 81 t->bt_rkey.data = p; 82 t->bt_rkey.size = sizeof(recno_t); 83 } 84 memmove(t->bt_rkey.data, &nrec, sizeof(recno_t)); 85 key->size = sizeof(recno_t); 86 key->data = t->bt_rkey.data; 87 88 dataonly: 89 if (data == NULL) 90 return (RET_SUCCESS); 91 92 /* 93 * We must copy big keys/data to make them contigous. Otherwise, 94 * leave the page pinned and don't copy unless the user specified 95 * concurrent access. 96 */ 97 rl = GETRLEAF(e->page, e->index); 98 if (rl->flags & P_BIGDATA) { 99 if (__ovfl_get(t, rl->bytes, 100 &data->size, &t->bt_rdata.data, &t->bt_rdata.size)) 101 return (RET_ERROR); 102 data->data = t->bt_rdata.data; 103 } else if (F_ISSET(t, B_DB_LOCK)) { 104 /* Use +1 in case the first record retrieved is 0 length. */ 105 if (rl->dsize + 1 > t->bt_rdata.size) { 106 p = (void *)(t->bt_rdata.data == NULL ? 107 malloc(rl->dsize + 1) : 108 realloc(t->bt_rdata.data, rl->dsize + 1)); 109 if (p == NULL) 110 return (RET_ERROR); 111 t->bt_rdata.data = p; 112 t->bt_rdata.size = rl->dsize + 1; 113 } 114 memmove(t->bt_rdata.data, rl->bytes, rl->dsize); 115 data->size = rl->dsize; 116 data->data = t->bt_rdata.data; 117 } else { 118 data->size = rl->dsize; 119 data->data = rl->bytes; 120 } 121 return (RET_SUCCESS); 122 } 123