1 /* $NetBSD: rec_utils.c,v 1.11 2007/02/03 23:46:09 christos 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 #if defined(LIBC_SCCS) && !defined(lint) 38 #if 0 39 static char sccsid[] = "@(#)rec_utils.c 8.6 (Berkeley) 7/16/94"; 40 #else 41 __RCSID("$NetBSD: rec_utils.c,v 1.11 2007/02/03 23:46:09 christos Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include <sys/param.h> 46 47 #include <assert.h> 48 #include <stdio.h> 49 #include <stdlib.h> 50 #include <string.h> 51 52 #include <db.h> 53 #include "recno.h" 54 55 /* 56 * __rec_ret -- 57 * Build return data. 58 * 59 * Parameters: 60 * t: tree 61 * e: key/data pair to be returned 62 * nrec: record number 63 * key: user's key structure 64 * data: user's data structure 65 * 66 * Returns: 67 * RET_SUCCESS, RET_ERROR. 68 */ 69 int 70 __rec_ret(BTREE *t, EPG *e, recno_t nrec, DBT *key, DBT *data) 71 { 72 RLEAF *rl; 73 void *p; 74 75 if (key == NULL) 76 goto dataonly; 77 78 /* We have to copy the key, it's not on the page. */ 79 if (sizeof(recno_t) > t->bt_rkey.size) { 80 p = (void *)(t->bt_rkey.data == NULL ? 81 malloc(sizeof(recno_t)) : 82 realloc(t->bt_rkey.data, sizeof(recno_t))); 83 if (p == NULL) 84 return (RET_ERROR); 85 t->bt_rkey.data = p; 86 t->bt_rkey.size = sizeof(recno_t); 87 } 88 memmove(t->bt_rkey.data, &nrec, sizeof(recno_t)); 89 key->size = sizeof(recno_t); 90 key->data = t->bt_rkey.data; 91 92 dataonly: 93 if (data == NULL) 94 return (RET_SUCCESS); 95 96 /* 97 * We must copy big keys/data to make them contigous. Otherwise, 98 * leave the page pinned and don't copy unless the user specified 99 * concurrent access. 100 */ 101 rl = GETRLEAF(e->page, e->index); 102 if (rl->flags & P_BIGDATA) { 103 if (__ovfl_get(t, rl->bytes, 104 &data->size, &t->bt_rdata.data, &t->bt_rdata.size)) 105 return (RET_ERROR); 106 data->data = t->bt_rdata.data; 107 } else if (F_ISSET(t, B_DB_LOCK)) { 108 /* Use +1 in case the first record retrieved is 0 length. */ 109 if (rl->dsize + 1 > t->bt_rdata.size) { 110 p = (void *)(t->bt_rdata.data == NULL ? 111 malloc(rl->dsize + 1) : 112 realloc(t->bt_rdata.data, rl->dsize + 1)); 113 if (p == NULL) 114 return (RET_ERROR); 115 t->bt_rdata.data = p; 116 t->bt_rdata.size = rl->dsize + 1; 117 } 118 memmove(t->bt_rdata.data, rl->bytes, rl->dsize); 119 data->size = rl->dsize; 120 data->data = t->bt_rdata.data; 121 } else { 122 data->size = rl->dsize; 123 data->data = rl->bytes; 124 } 125 return (RET_SUCCESS); 126 } 127