1 /* $NetBSD: rec_utils.c,v 1.8 1997/07/13 18:52:15 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. All advertising materials mentioning features or use of this software 16 * must display the following acknowledgement: 17 * This product includes software developed by the University of 18 * California, Berkeley and its contributors. 19 * 4. Neither the name of the University nor the names of its contributors 20 * may be used to endorse or promote products derived from this software 21 * without specific prior written permission. 22 * 23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 33 * SUCH DAMAGE. 34 */ 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 1.8 1997/07/13 18:52:15 christos Exp $"); 42 #endif 43 #endif /* LIBC_SCCS and not lint */ 44 45 #include <sys/param.h> 46 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 51 #include <db.h> 52 #include "recno.h" 53 54 /* 55 * __rec_ret -- 56 * Build return data. 57 * 58 * Parameters: 59 * t: tree 60 * e: key/data pair to be returned 61 * nrec: record number 62 * key: user's key structure 63 * data: user's data structure 64 * 65 * Returns: 66 * RET_SUCCESS, RET_ERROR. 67 */ 68 int 69 __rec_ret(t, e, nrec, key, data) 70 BTREE *t; 71 EPG *e; 72 recno_t nrec; 73 DBT *key, *data; 74 { 75 RLEAF *rl; 76 void *p; 77 78 if (key == NULL) 79 goto dataonly; 80 81 /* We have to copy the key, it's not on the page. */ 82 if (sizeof(recno_t) > t->bt_rkey.size) { 83 p = (void *)(t->bt_rkey.data == NULL ? 84 malloc(sizeof(recno_t)) : 85 realloc(t->bt_rkey.data, sizeof(recno_t))); 86 if (p == NULL) 87 return (RET_ERROR); 88 t->bt_rkey.data = p; 89 t->bt_rkey.size = sizeof(recno_t); 90 } 91 memmove(t->bt_rkey.data, &nrec, sizeof(recno_t)); 92 key->size = sizeof(recno_t); 93 key->data = t->bt_rkey.data; 94 95 dataonly: 96 if (data == NULL) 97 return (RET_SUCCESS); 98 99 /* 100 * We must copy big keys/data to make them contigous. Otherwise, 101 * leave the page pinned and don't copy unless the user specified 102 * concurrent access. 103 */ 104 rl = GETRLEAF(e->page, e->index); 105 if (rl->flags & P_BIGDATA) { 106 if (__ovfl_get(t, rl->bytes, 107 &data->size, &t->bt_rdata.data, &t->bt_rdata.size)) 108 return (RET_ERROR); 109 data->data = t->bt_rdata.data; 110 } else if (F_ISSET(t, B_DB_LOCK)) { 111 /* Use +1 in case the first record retrieved is 0 length. */ 112 if (rl->dsize + 1 > t->bt_rdata.size) { 113 p = (void *)(t->bt_rdata.data == NULL ? 114 malloc(rl->dsize + 1) : 115 realloc(t->bt_rdata.data, rl->dsize + 1)); 116 if (p == NULL) 117 return (RET_ERROR); 118 t->bt_rdata.data = p; 119 t->bt_rdata.size = rl->dsize + 1; 120 } 121 memmove(t->bt_rdata.data, rl->bytes, rl->dsize); 122 data->size = rl->dsize; 123 data->data = t->bt_rdata.data; 124 } else { 125 data->size = rl->dsize; 126 data->data = rl->bytes; 127 } 128 return (RET_SUCCESS); 129 } 130