1 /* $OpenBSD: ndbm.c,v 1.28 2023/02/17 17:59:36 miod Exp $ */ 2 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 #include <errno.h> 36 #include <fcntl.h> 37 #include <limits.h> 38 #include <stdio.h> 39 #include <string.h> 40 41 #include <ndbm.h> 42 #include "hash.h" 43 44 /* 45 * 46 * This package provides dbm and ndbm compatible interfaces to DB. 47 * First are the DBM routines, which call the NDBM routines, and 48 * the NDBM routines, which call the DB routines. 49 */ 50 51 static DBM *_dbm_open(const char *, const char *, int, mode_t); 52 53 /* 54 * Returns: 55 * *DBM on success 56 * NULL on failure 57 */ 58 static DBM * 59 _dbm_open(const char *file, const char *suff, int flags, mode_t mode) 60 { 61 HASHINFO info; 62 char path[PATH_MAX]; 63 int len; 64 65 len = snprintf(path, sizeof path, "%s%s", file, suff); 66 if (len < 0 || len >= sizeof path) { 67 errno = ENAMETOOLONG; 68 return (NULL); 69 } 70 /* O_WRONLY not supported by db(3) but traditional ndbm allowed it. */ 71 if ((flags & O_ACCMODE) == O_WRONLY) { 72 flags &= ~O_WRONLY; 73 flags |= O_RDWR; 74 } 75 info.bsize = 4096; 76 info.ffactor = 40; 77 info.nelem = 1; 78 info.cachesize = 0; 79 info.hash = NULL; 80 info.lorder = 0; 81 return ((DBM *)__hash_open(path, flags, mode, &info, 0)); 82 } 83 84 /* 85 * Returns: 86 * *DBM on success 87 * NULL on failure 88 */ 89 DBM * 90 dbm_open(const char *file, int flags, mode_t mode) 91 { 92 93 return(_dbm_open(file, DBM_SUFFIX, flags, mode)); 94 } 95 96 /* 97 * Returns: 98 * Nothing. 99 */ 100 void 101 dbm_close(DBM *db) 102 { 103 104 (void)(db->close)(db); 105 } 106 DEF_WEAK(dbm_close); 107 108 /* 109 * Returns: 110 * DATUM on success 111 * NULL on failure 112 */ 113 datum 114 dbm_fetch(DBM *db, datum key) 115 { 116 datum retdata; 117 int status; 118 DBT dbtkey, dbtretdata; 119 120 dbtkey.data = key.dptr; 121 dbtkey.size = key.dsize; 122 status = (db->get)(db, &dbtkey, &dbtretdata, 0); 123 if (status) { 124 dbtretdata.data = NULL; 125 dbtretdata.size = 0; 126 } 127 retdata.dptr = dbtretdata.data; 128 retdata.dsize = dbtretdata.size; 129 return (retdata); 130 } 131 DEF_WEAK(dbm_fetch); 132 133 /* 134 * Returns: 135 * DATUM on success 136 * NULL on failure 137 */ 138 datum 139 dbm_firstkey(DBM *db) 140 { 141 int status; 142 datum retkey; 143 DBT dbtretkey, dbtretdata; 144 145 status = (db->seq)(db, &dbtretkey, &dbtretdata, R_FIRST); 146 if (status) 147 dbtretkey.data = NULL; 148 retkey.dptr = dbtretkey.data; 149 retkey.dsize = dbtretkey.size; 150 return (retkey); 151 } 152 DEF_WEAK(dbm_firstkey); 153 154 /* 155 * Returns: 156 * DATUM on success 157 * NULL on failure 158 */ 159 datum 160 dbm_nextkey(DBM *db) 161 { 162 int status; 163 datum retkey; 164 DBT dbtretkey, dbtretdata; 165 166 status = (db->seq)(db, &dbtretkey, &dbtretdata, R_NEXT); 167 if (status) 168 dbtretkey.data = NULL; 169 retkey.dptr = dbtretkey.data; 170 retkey.dsize = dbtretkey.size; 171 return (retkey); 172 } 173 DEF_WEAK(dbm_nextkey); 174 175 /* 176 * Returns: 177 * 0 on success 178 * <0 on failure 179 */ 180 int 181 dbm_delete(DBM *db, datum key) 182 { 183 int status; 184 DBT dbtkey; 185 186 dbtkey.data = key.dptr; 187 dbtkey.size = key.dsize; 188 status = (db->del)(db, &dbtkey, 0); 189 if (status) 190 return (-1); 191 else 192 return (0); 193 } 194 DEF_WEAK(dbm_delete); 195 196 /* 197 * Returns: 198 * 0 on success 199 * <0 on failure 200 * 1 if DBM_INSERT and entry exists 201 */ 202 int 203 dbm_store(DBM *db, datum key, datum data, int flags) 204 { 205 DBT dbtkey, dbtdata; 206 207 dbtkey.data = key.dptr; 208 dbtkey.size = key.dsize; 209 dbtdata.data = data.dptr; 210 dbtdata.size = data.dsize; 211 return ((db->put)(db, &dbtkey, &dbtdata, 212 (flags == DBM_INSERT) ? R_NOOVERWRITE : 0)); 213 } 214 DEF_WEAK(dbm_store); 215 216 int 217 dbm_error(DBM *db) 218 { 219 HTAB *hp; 220 221 hp = (HTAB *)db->internal; 222 return (hp->err); 223 } 224 225 int 226 dbm_clearerr(DBM *db) 227 { 228 HTAB *hp; 229 230 hp = (HTAB *)db->internal; 231 hp->err = 0; 232 return (0); 233 } 234 235 int 236 dbm_dirfno(DBM *db) 237 { 238 239 return(((HTAB *)db->internal)->fp); 240 } 241 242 int 243 dbm_rdonly(DBM *dbp) 244 { 245 HTAB *hashp = (HTAB *)dbp->internal; 246 247 /* Could use DBM_RDONLY instead if we wanted... */ 248 return ((hashp->flags & O_ACCMODE) == O_RDONLY); 249 } 250 DEF_WEAK(dbm_rdonly); 251