ndbm.c revision 1.17.2.1
1 /* $NetBSD: ndbm.c,v 1.17.2.1 2004/04/30 03:46:39 jmc 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 <sys/cdefs.h> 36 #if defined(LIBC_SCCS) && !defined(lint) 37 #if 0 38 static char sccsid[] = "@(#)ndbm.c 8.4 (Berkeley) 7/21/94"; 39 #else 40 __RCSID("$NetBSD: ndbm.c,v 1.17.2.1 2004/04/30 03:46:39 jmc Exp $"); 41 #endif 42 #endif /* LIBC_SCCS and not lint */ 43 44 /* 45 * This package provides a dbm compatible interface to the new hashing 46 * package described in db(3). 47 */ 48 #include "namespace.h" 49 #include <sys/param.h> 50 51 #include <fcntl.h> 52 #include <stdio.h> 53 #include <string.h> 54 55 #include <ndbm.h> 56 #include "hash.h" 57 58 #ifdef __weak_alias 59 __weak_alias(dbm_clearerr,_dbm_clearerr) 60 __weak_alias(dbm_close,_dbm_close) 61 __weak_alias(dbm_delete,_dbm_delete) 62 __weak_alias(dbm_dirfno,_dbm_dirfno) 63 __weak_alias(dbm_error,_dbm_error) 64 __weak_alias(dbm_fetch,_dbm_fetch) 65 __weak_alias(dbm_firstkey,_dbm_firstkey) 66 __weak_alias(dbm_nextkey,_dbm_nextkey) 67 __weak_alias(dbm_open,_dbm_open) 68 __weak_alias(dbm_store,_dbm_store) 69 #endif 70 71 /* 72 * Returns: 73 * *DBM on success 74 * NULL on failure 75 */ 76 extern DBM * 77 dbm_open(file, flags, mode) 78 const char *file; 79 int flags; 80 mode_t mode; 81 { 82 HASHINFO info; 83 char path[MAXPATHLEN]; 84 85 info.bsize = 4096; 86 info.ffactor = 40; 87 info.nelem = 1; 88 info.cachesize = 0; 89 info.hash = NULL; 90 info.lorder = 0; 91 (void)strncpy(path, file, sizeof(path) - 1); 92 (void)strncat(path, DBM_SUFFIX, sizeof(path) - strlen(path) - 1); 93 if ((flags & O_ACCMODE) == O_WRONLY) { 94 flags &= ~O_WRONLY; 95 flags |= O_RDWR; 96 } 97 return ((DBM *)__hash_open(path, flags, mode, &info, 0)); 98 } 99 100 extern void 101 dbm_close(db) 102 DBM *db; 103 { 104 (void)(db->close)(db); 105 } 106 107 /* 108 * Returns: 109 * DATUM on success 110 * NULL on failure 111 */ 112 extern datum 113 dbm_fetch(db, key) 114 DBM *db; 115 datum key; 116 { 117 datum retdata; 118 int status; 119 DBT dbtkey, dbtretdata; 120 121 dbtkey.data = key.dptr; 122 dbtkey.size = key.dsize; 123 status = (db->get)(db, &dbtkey, &dbtretdata, 0); 124 if (status) { 125 dbtretdata.data = NULL; 126 dbtretdata.size = 0; 127 } 128 retdata.dptr = dbtretdata.data; 129 retdata.dsize = dbtretdata.size; 130 return (retdata); 131 } 132 133 /* 134 * Returns: 135 * DATUM on success 136 * NULL on failure 137 */ 138 extern datum 139 dbm_firstkey(db) 140 DBM *db; 141 { 142 int status; 143 datum retkey; 144 DBT dbtretkey, dbtretdata; 145 146 status = (db->seq)(db, &dbtretkey, &dbtretdata, R_FIRST); 147 if (status) 148 dbtretkey.data = NULL; 149 retkey.dptr = dbtretkey.data; 150 retkey.dsize = dbtretkey.size; 151 return (retkey); 152 } 153 154 /* 155 * Returns: 156 * DATUM on success 157 * NULL on failure 158 */ 159 extern datum 160 dbm_nextkey(db) 161 DBM *db; 162 { 163 int status; 164 datum retkey; 165 DBT dbtretkey, dbtretdata; 166 167 status = (db->seq)(db, &dbtretkey, &dbtretdata, R_NEXT); 168 if (status) 169 dbtretkey.data = NULL; 170 retkey.dptr = dbtretkey.data; 171 retkey.dsize = dbtretkey.size; 172 return (retkey); 173 } 174 175 /* 176 * Returns: 177 * 0 on success 178 * <0 failure 179 */ 180 extern int 181 dbm_delete(db, key) 182 DBM *db; 183 datum key; 184 { 185 int status; 186 DBT dbtkey; 187 188 dbtkey.data = key.dptr; 189 dbtkey.size = key.dsize; 190 status = (db->del)(db, &dbtkey, 0); 191 if (status) 192 return (-1); 193 else 194 return (0); 195 } 196 197 /* 198 * Returns: 199 * 0 on success 200 * <0 failure 201 * 1 if DBM_INSERT and entry exists 202 */ 203 extern int 204 dbm_store(db, key, data, flags) 205 DBM *db; 206 datum key, data; 207 int flags; 208 { 209 DBT dbtkey, dbtdata; 210 211 dbtkey.data = key.dptr; 212 dbtkey.size = key.dsize; 213 dbtdata.data = data.dptr; 214 dbtdata.size = data.dsize; 215 return ((db->put)(db, &dbtkey, &dbtdata, 216 (u_int)((flags == DBM_INSERT) ? R_NOOVERWRITE : 0))); 217 } 218 219 extern int 220 dbm_error(db) 221 DBM *db; 222 { 223 HTAB *hp; 224 225 hp = (HTAB *)db->internal; 226 return (hp->err); 227 } 228 229 extern int 230 dbm_clearerr(db) 231 DBM *db; 232 { 233 HTAB *hp; 234 235 hp = (HTAB *)db->internal; 236 hp->err = 0; 237 return (0); 238 } 239 240 extern int 241 dbm_dirfno(db) 242 DBM *db; 243 { 244 return(((HTAB *)db->internal)->fp); 245 } 246
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