1 /* $OpenBSD: rec_utils.c,v 1.9 2015/01/16 16:48:51 deraadt 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 <stdio.h> 32 #include <stdlib.h> 33 #include <string.h> 34 35 #include <db.h> 36 #include "recno.h" 37 38 /* 39 * __rec_ret -- 40 * Build return data. 41 * 42 * Parameters: 43 * t: tree 44 * e: key/data pair to be returned 45 * nrec: record number 46 * key: user's key structure 47 * data: user's data structure 48 * 49 * Returns: 50 * RET_SUCCESS, RET_ERROR. 51 */ 52 int 53 __rec_ret(BTREE *t, EPG *e, recno_t nrec, DBT *key, DBT *data) 54 { 55 RLEAF *rl; 56 void *p; 57 58 if (key == NULL) 59 goto dataonly; 60 61 /* We have to copy the key, it's not on the page. */ 62 if (sizeof(recno_t) > t->bt_rkey.size) { 63 p = realloc(t->bt_rkey.data, sizeof(recno_t)); 64 if (p == NULL) 65 return (RET_ERROR); 66 t->bt_rkey.data = p; 67 t->bt_rkey.size = sizeof(recno_t); 68 } 69 memmove(t->bt_rkey.data, &nrec, sizeof(recno_t)); 70 key->size = sizeof(recno_t); 71 key->data = t->bt_rkey.data; 72 73 dataonly: 74 if (data == NULL) 75 return (RET_SUCCESS); 76 77 /* 78 * We must copy big keys/data to make them contigous. Otherwise, 79 * leave the page pinned and don't copy unless the user specified 80 * concurrent access. 81 */ 82 rl = GETRLEAF(e->page, e->index); 83 if (rl->flags & P_BIGDATA) { 84 if (__ovfl_get(t, rl->bytes, 85 &data->size, &t->bt_rdata.data, &t->bt_rdata.size)) 86 return (RET_ERROR); 87 data->data = t->bt_rdata.data; 88 } else if (F_ISSET(t, B_DB_LOCK)) { 89 /* Use +1 in case the first record retrieved is 0 length. */ 90 if (rl->dsize + 1 > t->bt_rdata.size) { 91 p = realloc(t->bt_rdata.data, rl->dsize + 1); 92 if (p == NULL) 93 return (RET_ERROR); 94 t->bt_rdata.data = p; 95 t->bt_rdata.size = rl->dsize + 1; 96 } 97 memmove(t->bt_rdata.data, rl->bytes, rl->dsize); 98 data->size = rl->dsize; 99 data->data = t->bt_rdata.data; 100 } else { 101 data->size = rl->dsize; 102 data->data = rl->bytes; 103 } 104 return (RET_SUCCESS); 105 } 106