1/* $NetBSD: ndbmdatum.c,v 1.4 2008/09/11 12:58:00 joerg Exp $ */ 2/* from: NetBSD: ndbm.c,v 1.18 2004/04/27 20:03:45 kleink Exp */ 3 4/*- 5 * Copyright (c) 1990, 1993 6 * The Regents of the University of California. All rights reserved. 7 * 8 * This code is derived from software contributed to Berkeley by 9 * Margo Seltzer. 10 * 11 * Redistribution and use in source and binary forms, with or without 12 * modification, are permitted provided that the following conditions 13 * are met: 14 * 1. Redistributions of source code must retain the above copyright 15 * notice, this list of conditions and the following disclaimer. 16 * 2. Redistributions in binary form must reproduce the above copyright 17 * notice, this list of conditions and the following disclaimer in the 18 * documentation and/or other materials provided with the distribution. 19 * 3. 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 HAVE_NBTOOL_CONFIG_H 37#include "nbtool_config.h" 38#endif 39 40#include <sys/cdefs.h> 41__RCSID("$NetBSD: ndbmdatum.c,v 1.4 2008/09/11 12:58:00 joerg Exp $"); 42 43/* 44 * This package provides a dbm compatible interface to the new hashing 45 * package described in db(3). 46 */ 47#include "namespace.h" 48#include <sys/param.h> 49 50#include <fcntl.h> 51#include <stdio.h> 52#include <string.h> 53 54#include <ndbm.h> 55#include "hash.h" 56 57#ifndef datum_truncate 58#define datum_truncate(a) (a) 59#endif 60/* 61 * Returns: 62 * DATUM on success 63 * NULL on failure 64 */ 65datum 66dbm_fetch(DBM *db, datum key) 67{ 68 datum retdata; 69 int status; 70 DBT dbtkey, dbtretdata; 71 72 dbtkey.data = key.dptr; 73 dbtkey.size = key.dsize; 74 status = (db->get)(db, &dbtkey, &dbtretdata, 0); 75 if (status) { 76 dbtretdata.data = NULL; 77 dbtretdata.size = 0; 78 } 79 retdata.dptr = dbtretdata.data; 80 retdata.dsize = datum_truncate(dbtretdata.size); 81 return (retdata); 82} 83 84/* 85 * Returns: 86 * DATUM on success 87 * NULL on failure 88 */ 89datum 90dbm_firstkey(DBM *db) 91{ 92 int status; 93 datum retkey; 94 DBT dbtretkey, dbtretdata; 95 96 status = (db->seq)(db, &dbtretkey, &dbtretdata, R_FIRST); 97 if (status) 98 dbtretkey.data = NULL; 99 retkey.dptr = dbtretkey.data; 100 retkey.dsize = datum_truncate(dbtretkey.size); 101 return (retkey); 102} 103 104/* 105 * Returns: 106 * DATUM on success 107 * NULL on failure 108 */ 109datum 110dbm_nextkey(DBM *db) 111{ 112 int status; 113 datum retkey; 114 DBT dbtretkey, dbtretdata; 115 116 status = (db->seq)(db, &dbtretkey, &dbtretdata, R_NEXT); 117 if (status) 118 dbtretkey.data = NULL; 119 retkey.dptr = dbtretkey.data; 120 retkey.dsize = datum_truncate(dbtretkey.size); 121 return (retkey); 122} 123 124/* 125 * Returns: 126 * 0 on success 127 * <0 failure 128 */ 129int 130dbm_delete(DBM *db, datum key) 131{ 132 int status; 133 DBT dbtkey; 134 135 dbtkey.data = key.dptr; 136 dbtkey.size = key.dsize; 137 status = (db->del)(db, &dbtkey, 0); 138 if (status) 139 return (-1); 140 else 141 return (0); 142} 143 144/* 145 * Returns: 146 * 0 on success 147 * <0 failure 148 * 1 if DBM_INSERT and entry exists 149 */ 150int 151dbm_store(DBM *db, datum key, datum data, int flags) 152{ 153 DBT dbtkey, dbtdata; 154 155 dbtkey.data = key.dptr; 156 dbtkey.size = key.dsize; 157 dbtdata.data = data.dptr; 158 dbtdata.size = data.dsize; 159 return ((db->put)(db, &dbtkey, &dbtdata, 160 (u_int)((flags == DBM_INSERT) ? R_NOOVERWRITE : 0))); 161} 162