1 /* $NetBSD: rec_utils.c,v 1.6 1995/02/27 13:25:29 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 8.4 (Berkeley) 6/20/94"; 39 #else 40 static char rcsid[] = "$NetBSD: rec_utils.c,v 1.6 1995/02/27 13:25:29 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 -- Build return data as a result of search or scan. 55 * 56 * Parameters: 57 * t: tree 58 * d: LEAF to be returned to the user. 59 * data: user's data structure 60 * 61 * Returns: 62 * RET_SUCCESS, RET_ERROR. 63 */ 64 int 65 __rec_ret(t, e, nrec, key, data) 66 BTREE *t; 67 EPG *e; 68 recno_t nrec; 69 DBT *key, *data; 70 { 71 register RLEAF *rl; 72 register void *p; 73 74 if (data == NULL) 75 goto retkey; 76 77 rl = GETRLEAF(e->page, e->index); 78 79 /* 80 * We always copy big data to make it contigous. Otherwise, we 81 * leave the page pinned and don't copy unless the user specified 82 * concurrent access. 83 */ 84 if (rl->flags & P_BIGDATA) { 85 if (__ovfl_get(t, rl->bytes, 86 &data->size, &t->bt_dbuf, &t->bt_dbufsz)) 87 return (RET_ERROR); 88 data->data = t->bt_dbuf; 89 } else if (ISSET(t, B_DB_LOCK)) { 90 /* Use +1 in case the first record retrieved is 0 length. */ 91 if (rl->dsize + 1 > t->bt_dbufsz) { 92 p = (void *)(t->bt_dbuf == NULL ? 93 malloc(rl->dsize + 1) : 94 realloc(t->bt_dbuf, rl->dsize + 1)); 95 if (p == NULL) 96 return (RET_ERROR); 97 t->bt_dbuf = p; 98 t->bt_dbufsz = rl->dsize + 1; 99 } 100 memmove(t->bt_dbuf, rl->bytes, rl->dsize); 101 data->size = rl->dsize; 102 data->data = t->bt_dbuf; 103 } else { 104 data->size = rl->dsize; 105 data->data = rl->bytes; 106 } 107 108 retkey: if (key == NULL) 109 return (RET_SUCCESS); 110 111 /* We have to copy the key, it's not on the page. */ 112 if (sizeof(recno_t) > t->bt_kbufsz) { 113 p = (void *)(t->bt_kbuf == NULL ? 114 malloc(sizeof(recno_t)) : 115 realloc(t->bt_kbuf, sizeof(recno_t))); 116 if (p == NULL) 117 return (RET_ERROR); 118 t->bt_kbuf = p; 119 t->bt_kbufsz = sizeof(recno_t); 120 } 121 memmove(t->bt_kbuf, &nrec, sizeof(recno_t)); 122 key->size = sizeof(recno_t); 123 key->data = t->bt_kbuf; 124 return (RET_SUCCESS); 125 } 126