1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1990, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * This code is derived from software contributed to Berkeley by 8 * Margo Seltzer. 9 * 10 * Redistribution and use in source and binary forms, with or without 11 * modification, are permitted provided that the following conditions 12 * are met: 13 * 1. Redistributions of source code must retain the above copyright 14 * notice, this list of conditions and the following disclaimer. 15 * 2. Redistributions in binary form must reproduce the above copyright 16 * notice, this list of conditions and the following disclaimer in the 17 * documentation and/or other materials provided with the distribution. 18 * 3. Neither the name of the University nor the names of its contributors 19 * may be used to endorse or promote products derived from this software 20 * without specific prior written permission. 21 * 22 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 23 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 24 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 25 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 26 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 27 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 28 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 29 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 30 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 31 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 32 * SUCH DAMAGE. 33 */ 34 35 #if defined(LIBC_SCCS) && !defined(lint) 36 static char sccsid[] = "@(#)ndbm.c 8.4 (Berkeley) 7/21/94"; 37 #endif /* LIBC_SCCS and not lint */ 38 /* 39 * This package provides a dbm compatible interface to the new hashing 40 * package described in db(3). 41 */ 42 43 #include <sys/param.h> 44 45 #include <stdio.h> 46 #include <string.h> 47 #include <errno.h> 48 49 #include <ndbm.h> 50 #include "hash.h" 51 52 /* 53 * Returns: 54 * *DBM on success 55 * NULL on failure 56 */ 57 extern DBM * 58 dbm_open(const char *file, int flags, mode_t mode) 59 { 60 HASHINFO info; 61 char path[MAXPATHLEN]; 62 63 info.bsize = 4096; 64 info.ffactor = 40; 65 info.nelem = 1; 66 info.cachesize = 0; 67 info.hash = NULL; 68 info.lorder = 0; 69 70 if( strlen(file) >= sizeof(path) - strlen(DBM_SUFFIX)) { 71 errno = ENAMETOOLONG; 72 return(NULL); 73 } 74 (void)strcpy(path, file); 75 (void)strcat(path, DBM_SUFFIX); 76 return ((DBM *)__hash_open(path, flags, mode, &info, 0)); 77 } 78 79 extern void 80 dbm_close(DBM *db) 81 { 82 (void)(db->close)(db); 83 } 84 85 /* 86 * Returns: 87 * DATUM on success 88 * NULL on failure 89 */ 90 extern datum 91 dbm_fetch(DBM *db, datum key) 92 { 93 datum retdata; 94 int status; 95 DBT dbtkey, dbtretdata; 96 97 dbtkey.data = key.dptr; 98 dbtkey.size = key.dsize; 99 status = (db->get)(db, &dbtkey, &dbtretdata, 0); 100 if (status) { 101 dbtretdata.data = NULL; 102 dbtretdata.size = 0; 103 } 104 retdata.dptr = dbtretdata.data; 105 retdata.dsize = dbtretdata.size; 106 return (retdata); 107 } 108 109 /* 110 * Returns: 111 * DATUM on success 112 * NULL on failure 113 */ 114 extern datum 115 dbm_firstkey(DBM *db) 116 { 117 int status; 118 datum retkey; 119 DBT dbtretkey, dbtretdata; 120 121 status = (db->seq)(db, &dbtretkey, &dbtretdata, R_FIRST); 122 if (status) 123 dbtretkey.data = NULL; 124 retkey.dptr = dbtretkey.data; 125 retkey.dsize = dbtretkey.size; 126 return (retkey); 127 } 128 129 /* 130 * Returns: 131 * DATUM on success 132 * NULL on failure 133 */ 134 extern datum 135 dbm_nextkey(DBM *db) 136 { 137 int status; 138 datum retkey; 139 DBT dbtretkey, dbtretdata; 140 141 status = (db->seq)(db, &dbtretkey, &dbtretdata, R_NEXT); 142 if (status) 143 dbtretkey.data = NULL; 144 retkey.dptr = dbtretkey.data; 145 retkey.dsize = dbtretkey.size; 146 return (retkey); 147 } 148 149 /* 150 * Returns: 151 * 0 on success 152 * <0 failure 153 */ 154 extern int 155 dbm_delete(DBM *db, datum key) 156 { 157 int status; 158 DBT dbtkey; 159 160 dbtkey.data = key.dptr; 161 dbtkey.size = key.dsize; 162 status = (db->del)(db, &dbtkey, 0); 163 if (status) 164 return (-1); 165 else 166 return (0); 167 } 168 169 /* 170 * Returns: 171 * 0 on success 172 * <0 failure 173 * 1 if DBM_INSERT and entry exists 174 */ 175 extern int 176 dbm_store(DBM *db, datum key, datum data, int flags) 177 { 178 DBT dbtkey, dbtdata; 179 180 dbtkey.data = key.dptr; 181 dbtkey.size = key.dsize; 182 dbtdata.data = data.dptr; 183 dbtdata.size = data.dsize; 184 return ((db->put)(db, &dbtkey, &dbtdata, 185 (flags == DBM_INSERT) ? R_NOOVERWRITE : 0)); 186 } 187 188 extern int 189 dbm_error(DBM *db) 190 { 191 HTAB *hp; 192 193 hp = (HTAB *)db->internal; 194 return (hp->error); 195 } 196 197 extern int 198 dbm_clearerr(DBM *db) 199 { 200 HTAB *hp; 201 202 hp = (HTAB *)db->internal; 203 hp->error = 0; 204 return (0); 205 } 206 207 extern int 208 dbm_dirfno(DBM *db) 209 { 210 return(((HTAB *)db->internal)->fp); 211 } 212