1 /* $OpenBSD: rec_utils.c,v 1.7 2005/08/05 13:03:00 espie Exp $ */ 2 /*- 3 * Copyright (c) 1990, 1993, 1994 4 * The Regents of the University of California. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 3. Neither the name of the University nor the names of its contributors 15 * may be used to endorse or promote products derived from this software 16 * without specific prior written permission. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/param.h> 32 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <string.h> 36 37 #include <db.h> 38 #include "recno.h" 39 40 /* 41 * __rec_ret -- 42 * Build return data. 43 * 44 * Parameters: 45 * t: tree 46 * e: key/data pair to be returned 47 * nrec: record number 48 * key: user's key structure 49 * data: user's data structure 50 * 51 * Returns: 52 * RET_SUCCESS, RET_ERROR. 53 */ 54 int 55 __rec_ret(BTREE *t, EPG *e, recno_t nrec, DBT *key, DBT *data) 56 { 57 RLEAF *rl; 58 void *p; 59 60 if (key == NULL) 61 goto dataonly; 62 63 /* We have to copy the key, it's not on the page. */ 64 if (sizeof(recno_t) > t->bt_rkey.size) { 65 p = (void *)(t->bt_rkey.data == NULL ? 66 malloc(sizeof(recno_t)) : 67 realloc(t->bt_rkey.data, sizeof(recno_t))); 68 if (p == NULL) 69 return (RET_ERROR); 70 t->bt_rkey.data = p; 71 t->bt_rkey.size = sizeof(recno_t); 72 } 73 memmove(t->bt_rkey.data, &nrec, sizeof(recno_t)); 74 key->size = sizeof(recno_t); 75 key->data = t->bt_rkey.data; 76 77 dataonly: 78 if (data == NULL) 79 return (RET_SUCCESS); 80 81 /* 82 * We must copy big keys/data to make them contigous. Otherwise, 83 * leave the page pinned and don't copy unless the user specified 84 * concurrent access. 85 */ 86 rl = GETRLEAF(e->page, e->index); 87 if (rl->flags & P_BIGDATA) { 88 if (__ovfl_get(t, rl->bytes, 89 &data->size, &t->bt_rdata.data, &t->bt_rdata.size)) 90 return (RET_ERROR); 91 data->data = t->bt_rdata.data; 92 } else if (F_ISSET(t, B_DB_LOCK)) { 93 /* Use +1 in case the first record retrieved is 0 length. */ 94 if (rl->dsize + 1 > t->bt_rdata.size) { 95 p = (void *)(t->bt_rdata.data == NULL ? 96 malloc(rl->dsize + 1) : 97 realloc(t->bt_rdata.data, rl->dsize + 1)); 98 if (p == NULL) 99 return (RET_ERROR); 100 t->bt_rdata.data = p; 101 t->bt_rdata.size = rl->dsize + 1; 102 } 103 memmove(t->bt_rdata.data, rl->bytes, rl->dsize); 104 data->size = rl->dsize; 105 data->data = t->bt_rdata.data; 106 } else { 107 data->size = rl->dsize; 108 data->data = rl->bytes; 109 } 110 return (RET_SUCCESS); 111 } 112