1 /*- 2 * Copyright (c) 1990, 1993, 1994 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 */ 29 30 #if defined(LIBC_SCCS) && !defined(lint) 31 static const char rcsid[] = "$OpenBSD: rec_utils.c,v 1.5 2003/06/02 20:18:34 millert Exp $"; 32 #endif /* LIBC_SCCS and not lint */ 33 34 #include <sys/param.h> 35 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <string.h> 39 40 #include <db.h> 41 #include "recno.h" 42 43 /* 44 * __rec_ret -- 45 * Build return data. 46 * 47 * Parameters: 48 * t: tree 49 * e: key/data pair to be returned 50 * nrec: record number 51 * key: user's key structure 52 * data: user's data structure 53 * 54 * Returns: 55 * RET_SUCCESS, RET_ERROR. 56 */ 57 int 58 __rec_ret(t, e, nrec, key, data) 59 BTREE *t; 60 EPG *e; 61 recno_t nrec; 62 DBT *key, *data; 63 { 64 RLEAF *rl; 65 void *p; 66 67 if (key == NULL) 68 goto dataonly; 69 70 /* We have to copy the key, it's not on the page. */ 71 if (sizeof(recno_t) > t->bt_rkey.size) { 72 p = (void *)(t->bt_rkey.data == NULL ? 73 malloc(sizeof(recno_t)) : 74 realloc(t->bt_rkey.data, sizeof(recno_t))); 75 if (p == NULL) 76 return (RET_ERROR); 77 t->bt_rkey.data = p; 78 t->bt_rkey.size = sizeof(recno_t); 79 } 80 memmove(t->bt_rkey.data, &nrec, sizeof(recno_t)); 81 key->size = sizeof(recno_t); 82 key->data = t->bt_rkey.data; 83 84 dataonly: 85 if (data == NULL) 86 return (RET_SUCCESS); 87 88 /* 89 * We must copy big keys/data to make them contigous. Otherwise, 90 * leave the page pinned and don't copy unless the user specified 91 * concurrent access. 92 */ 93 rl = GETRLEAF(e->page, e->index); 94 if (rl->flags & P_BIGDATA) { 95 if (__ovfl_get(t, rl->bytes, 96 &data->size, &t->bt_rdata.data, &t->bt_rdata.size)) 97 return (RET_ERROR); 98 data->data = t->bt_rdata.data; 99 } else if (F_ISSET(t, B_DB_LOCK)) { 100 /* Use +1 in case the first record retrieved is 0 length. */ 101 if (rl->dsize + 1 > t->bt_rdata.size) { 102 p = (void *)(t->bt_rdata.data == NULL ? 103 malloc(rl->dsize + 1) : 104 realloc(t->bt_rdata.data, rl->dsize + 1)); 105 if (p == NULL) 106 return (RET_ERROR); 107 t->bt_rdata.data = p; 108 t->bt_rdata.size = rl->dsize + 1; 109 } 110 memmove(t->bt_rdata.data, rl->bytes, rl->dsize); 111 data->size = rl->dsize; 112 data->data = t->bt_rdata.data; 113 } else { 114 data->size = rl->dsize; 115 data->data = rl->bytes; 116 } 117 return (RET_SUCCESS); 118 } 119