1 /* $OpenBSD: rec_utils.c,v 1.8 2007/08/07 05:40:34 ray 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 = realloc(t->bt_rkey.data, sizeof(recno_t)); 66 if (p == NULL) 67 return (RET_ERROR); 68 t->bt_rkey.data = p; 69 t->bt_rkey.size = sizeof(recno_t); 70 } 71 memmove(t->bt_rkey.data, &nrec, sizeof(recno_t)); 72 key->size = sizeof(recno_t); 73 key->data = t->bt_rkey.data; 74 75 dataonly: 76 if (data == NULL) 77 return (RET_SUCCESS); 78 79 /* 80 * We must copy big keys/data to make them contigous. Otherwise, 81 * leave the page pinned and don't copy unless the user specified 82 * concurrent access. 83 */ 84 rl = GETRLEAF(e->page, e->index); 85 if (rl->flags & P_BIGDATA) { 86 if (__ovfl_get(t, rl->bytes, 87 &data->size, &t->bt_rdata.data, &t->bt_rdata.size)) 88 return (RET_ERROR); 89 data->data = t->bt_rdata.data; 90 } else if (F_ISSET(t, B_DB_LOCK)) { 91 /* Use +1 in case the first record retrieved is 0 length. */ 92 if (rl->dsize + 1 > t->bt_rdata.size) { 93 p = realloc(t->bt_rdata.data, rl->dsize + 1); 94 if (p == NULL) 95 return (RET_ERROR); 96 t->bt_rdata.data = p; 97 t->bt_rdata.size = rl->dsize + 1; 98 } 99 memmove(t->bt_rdata.data, rl->bytes, rl->dsize); 100 data->size = rl->dsize; 101 data->data = t->bt_rdata.data; 102 } else { 103 data->size = rl->dsize; 104 data->data = rl->bytes; 105 } 106 return (RET_SUCCESS); 107 } 108