1 /* $NetBSD: rec_utils.c,v 1.7 1996/05/03 21:38:54 cgd 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 #if defined(LIBC_SCCS) && !defined(lint) 37 #if 0 38 static char sccsid[] = "@(#)rec_utils.c 8.6 (Berkeley) 7/16/94"; 39 #else 40 static char rcsid[] = "$NetBSD: rec_utils.c,v 1.7 1996/05/03 21:38:54 cgd Exp $"; 41 #endif 42 #endif /* LIBC_SCCS and not lint */ 43 44 #include <sys/param.h> 45 46 #include <stdio.h> 47 #include <stdlib.h> 48 #include <string.h> 49 50 #include <db.h> 51 #include "recno.h" 52 53 /* 54 * __rec_ret -- 55 * Build return data. 56 * 57 * Parameters: 58 * t: tree 59 * e: key/data pair to be returned 60 * nrec: record number 61 * key: user's key structure 62 * data: user's data structure 63 * 64 * Returns: 65 * RET_SUCCESS, RET_ERROR. 66 */ 67 int 68 __rec_ret(t, e, nrec, key, data) 69 BTREE *t; 70 EPG *e; 71 recno_t nrec; 72 DBT *key, *data; 73 { 74 RLEAF *rl; 75 void *p; 76 77 if (key == NULL) 78 goto dataonly; 79 80 /* We have to copy the key, it's not on the page. */ 81 if (sizeof(recno_t) > t->bt_rkey.size) { 82 p = (void *)(t->bt_rkey.data == NULL ? 83 malloc(sizeof(recno_t)) : 84 realloc(t->bt_rkey.data, sizeof(recno_t))); 85 if (p == NULL) 86 return (RET_ERROR); 87 t->bt_rkey.data = p; 88 t->bt_rkey.size = sizeof(recno_t); 89 } 90 memmove(t->bt_rkey.data, &nrec, sizeof(recno_t)); 91 key->size = sizeof(recno_t); 92 key->data = t->bt_rkey.data; 93 94 dataonly: 95 if (data == NULL) 96 return (RET_SUCCESS); 97 98 /* 99 * We must copy big keys/data to make them contigous. Otherwise, 100 * leave the page pinned and don't copy unless the user specified 101 * concurrent access. 102 */ 103 rl = GETRLEAF(e->page, e->index); 104 if (rl->flags & P_BIGDATA) { 105 if (__ovfl_get(t, rl->bytes, 106 &data->size, &t->bt_rdata.data, &t->bt_rdata.size)) 107 return (RET_ERROR); 108 data->data = t->bt_rdata.data; 109 } else if (F_ISSET(t, B_DB_LOCK)) { 110 /* Use +1 in case the first record retrieved is 0 length. */ 111 if (rl->dsize + 1 > t->bt_rdata.size) { 112 p = (void *)(t->bt_rdata.data == NULL ? 113 malloc(rl->dsize + 1) : 114 realloc(t->bt_rdata.data, rl->dsize + 1)); 115 if (p == NULL) 116 return (RET_ERROR); 117 t->bt_rdata.data = p; 118 t->bt_rdata.size = rl->dsize + 1; 119 } 120 memmove(t->bt_rdata.data, rl->bytes, rl->dsize); 121 data->size = rl->dsize; 122 data->data = t->bt_rdata.data; 123 } else { 124 data->size = rl->dsize; 125 data->data = rl->bytes; 126 } 127 return (RET_SUCCESS); 128 } 129