ndbm.c revision 1.17
1 /* $NetBSD: ndbm.c,v 1.17 2003/08/07 16:42:43 agc 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 2003/08/07 16:42:43 agc 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 <stdio.h> 52 #include <string.h> 53 54 #include <ndbm.h> 55 #include "hash.h" 56 57 #ifdef __weak_alias 58 __weak_alias(dbm_clearerr,_dbm_clearerr) 59 __weak_alias(dbm_close,_dbm_close) 60 __weak_alias(dbm_delete,_dbm_delete) 61 __weak_alias(dbm_dirfno,_dbm_dirfno) 62 __weak_alias(dbm_error,_dbm_error) 63 __weak_alias(dbm_fetch,_dbm_fetch) 64 __weak_alias(dbm_firstkey,_dbm_firstkey) 65 __weak_alias(dbm_nextkey,_dbm_nextkey) 66 __weak_alias(dbm_open,_dbm_open) 67 __weak_alias(dbm_store,_dbm_store) 68 #endif 69 70 /* 71 * Returns: 72 * *DBM on success 73 * NULL on failure 74 */ 75 extern DBM * 76 dbm_open(file, flags, mode) 77 const char *file; 78 int flags; 79 mode_t mode; 80 { 81 HASHINFO info; 82 char path[MAXPATHLEN]; 83 84 info.bsize = 4096; 85 info.ffactor = 40; 86 info.nelem = 1; 87 info.cachesize = 0; 88 info.hash = NULL; 89 info.lorder = 0; 90 (void)strncpy(path, file, sizeof(path) - 1); 91 (void)strncat(path, DBM_SUFFIX, sizeof(path) - strlen(path) - 1); 92 return ((DBM *)__hash_open(path, flags, mode, &info, 0)); 93 } 94 95 extern void 96 dbm_close(db) 97 DBM *db; 98 { 99 (void)(db->close)(db); 100 } 101 102 /* 103 * Returns: 104 * DATUM on success 105 * NULL on failure 106 */ 107 extern datum 108 dbm_fetch(db, key) 109 DBM *db; 110 datum key; 111 { 112 datum retdata; 113 int status; 114 DBT dbtkey, dbtretdata; 115 116 dbtkey.data = key.dptr; 117 dbtkey.size = key.dsize; 118 status = (db->get)(db, &dbtkey, &dbtretdata, 0); 119 if (status) { 120 dbtretdata.data = NULL; 121 dbtretdata.size = 0; 122 } 123 retdata.dptr = dbtretdata.data; 124 retdata.dsize = dbtretdata.size; 125 return (retdata); 126 } 127 128 /* 129 * Returns: 130 * DATUM on success 131 * NULL on failure 132 */ 133 extern datum 134 dbm_firstkey(db) 135 DBM *db; 136 { 137 int status; 138 datum retkey; 139 DBT dbtretkey, dbtretdata; 140 141 status = (db->seq)(db, &dbtretkey, &dbtretdata, R_FIRST); 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 * DATUM on success 152 * NULL on failure 153 */ 154 extern datum 155 dbm_nextkey(db) 156 DBM *db; 157 { 158 int status; 159 datum retkey; 160 DBT dbtretkey, dbtretdata; 161 162 status = (db->seq)(db, &dbtretkey, &dbtretdata, R_NEXT); 163 if (status) 164 dbtretkey.data = NULL; 165 retkey.dptr = dbtretkey.data; 166 retkey.dsize = dbtretkey.size; 167 return (retkey); 168 } 169 170 /* 171 * Returns: 172 * 0 on success 173 * <0 failure 174 */ 175 extern int 176 dbm_delete(db, key) 177 DBM *db; 178 datum key; 179 { 180 int status; 181 DBT dbtkey; 182 183 dbtkey.data = key.dptr; 184 dbtkey.size = key.dsize; 185 status = (db->del)(db, &dbtkey, 0); 186 if (status) 187 return (-1); 188 else 189 return (0); 190 } 191 192 /* 193 * Returns: 194 * 0 on success 195 * <0 failure 196 * 1 if DBM_INSERT and entry exists 197 */ 198 extern int 199 dbm_store(db, key, data, flags) 200 DBM *db; 201 datum key, data; 202 int flags; 203 { 204 DBT dbtkey, dbtdata; 205 206 dbtkey.data = key.dptr; 207 dbtkey.size = key.dsize; 208 dbtdata.data = data.dptr; 209 dbtdata.size = data.dsize; 210 return ((db->put)(db, &dbtkey, &dbtdata, 211 (u_int)((flags == DBM_INSERT) ? R_NOOVERWRITE : 0))); 212 } 213 214 extern int 215 dbm_error(db) 216 DBM *db; 217 { 218 HTAB *hp; 219 220 hp = (HTAB *)db->internal; 221 return (hp->err); 222 } 223 224 extern int 225 dbm_clearerr(db) 226 DBM *db; 227 { 228 HTAB *hp; 229 230 hp = (HTAB *)db->internal; 231 hp->err = 0; 232 return (0); 233 } 234 235 extern int 236 dbm_dirfno(db) 237 DBM *db; 238 { 239 return(((HTAB *)db->internal)->fp); 240 } 241
Indexes created Thu Oct 23 22:10:10 GMT 2025