db/hash/FreeBSD/ndbm.c

   1 /*-
   2  * Copyright (c) 1990, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * This code is derived from software contributed to Berkeley by
   6  * Margo Seltzer.
   7  *
   8  * Redistribution and use in source and binary forms, with or without
   9  * modification, are permitted provided that the following conditions
  10  * are met:
  11  * 1. Redistributions of source code must retain the above copyright
  12  *    notice, this list of conditions and the following disclaimer.
  13  * 2. Redistributions in binary form must reproduce the above copyright
  14  *    notice, this list of conditions and the following disclaimer in the
  15  *    documentation and/or other materials provided with the distribution.
  16  * 3. All advertising materials mentioning features or use of this software
  17  *    must display the following acknowledgement:
  18  *      This product includes software developed by the University of
  19  *      California, Berkeley and its contributors.
  20  * 4. Neither the name of the University nor the names of its contributors
  21  *    may be used to endorse or promote products derived from this software
  22  *    without specific prior written permission.
  23  *
  24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  34  * SUCH DAMAGE.
  35  */
  36
  37 #if defined(LIBC_SCCS) && !defined(lint)
  38 static char sccsid[] = "@(#)ndbm.c      8.4 (Berkeley) 7/21/94";
  39 #endif /* LIBC_SCCS and not lint */
  40 #include <sys/cdefs.h>
  41 __FBSDID("$FreeBSD: src/lib/libc/db/hash/ndbm.c,v 1.6 2002/03/22 21:52:01 obrien Exp $");
  42
  43 /*
  44  * This package provides a dbm compatible interface to the new hashing
  45  * package described in db(3).
  46  */
  47
  48 #include <sys/param.h>
  49
  50 #include <stdio.h>
  51 #include <string.h>
  52 #include <errno.h>
  53
  54 #include <ndbm.h>
  55 #include "hash.h"
  56
  57 /*
  58  * Returns:
  59  *      *DBM on success
  60  *       NULL on failure
  61  */
  62 extern DBM *
  63 dbm_open(file, flags, mode)
  64         const char *file;
  65         int flags, mode;
  66 {
  67         HASHINFO info;
  68         char path[MAXPATHLEN];
  69
  70         info.bsize = 4096;
  71         info.ffactor = 40;
  72         info.nelem = 1;
  73         info.cachesize = 0;
  74         info.hash = NULL;
  75         info.lorder = 0;
  76
  77         if( strlen(file) >= sizeof(path) - strlen(DBM_SUFFIX)) {
  78                 errno = ENAMETOOLONG;
  79                 return(NULL);
  80         }
  81         (void)strcpy(path, file);
  82         (void)strcat(path, DBM_SUFFIX);
  83         return ((DBM *)__hash_open(path, flags, mode, &info, 0));
  84 }
  85
  86 extern void
  87 dbm_close(db)
  88         DBM *db;
  89 {
  90         (void)(db->close)(db);
  91 }
  92
  93 /*
  94  * Returns:
  95  *      DATUM on success
  96  *      NULL on failure
  97  */
  98 extern datum
  99 dbm_fetch(db, key)
 100         DBM *db;
 101         datum key;
 102 {
 103         datum retdata;
 104         int status;
 105         DBT dbtkey, dbtretdata;
 106
 107         dbtkey.data = key.dptr;
 108         dbtkey.size = key.dsize;
 109         status = (db->get)(db, &dbtkey, &dbtretdata, 0);
 110         if (status) {
 111                 dbtretdata.data = NULL;
 112                 dbtretdata.size = 0;
 113         }
 114         retdata.dptr = dbtretdata.data;
 115         retdata.dsize = dbtretdata.size;
 116         return (retdata);
 117 }
 118
 119 /*
 120  * Returns:
 121  *      DATUM on success
 122  *      NULL on failure
 123  */
 124 extern datum
 125 dbm_firstkey(db)
 126         DBM *db;
 127 {
 128         int status;
 129         datum retkey;
 130         DBT dbtretkey, dbtretdata;
 131
 132         status = (db->seq)(db, &dbtretkey, &dbtretdata, R_FIRST);
 133         if (status)
 134                 dbtretkey.data = NULL;
 135         retkey.dptr = dbtretkey.data;
 136         retkey.dsize = dbtretkey.size;
 137         return (retkey);
 138 }
 139
 140 /*
 141  * Returns:
 142  *      DATUM on success
 143  *      NULL on failure
 144  */
 145 extern datum
 146 dbm_nextkey(db)
 147         DBM *db;
 148 {
 149         int status;
 150         datum retkey;
 151         DBT dbtretkey, dbtretdata;
 152
 153         status = (db->seq)(db, &dbtretkey, &dbtretdata, R_NEXT);
 154         if (status)
 155                 dbtretkey.data = NULL;
 156         retkey.dptr = dbtretkey.data;
 157         retkey.dsize = dbtretkey.size;
 158         return (retkey);
 159 }
 160
 161 /*
 162  * Returns:
 163  *       0 on success
 164  *      <0 failure
 165  */
 166 extern int
 167 dbm_delete(db, key)
 168         DBM *db;
 169         datum key;
 170 {
 171         int status;
 172         DBT dbtkey;
 173
 174         dbtkey.data = key.dptr;
 175         dbtkey.size = key.dsize;
 176         status = (db->del)(db, &dbtkey, 0);
 177         if (status)
 178                 return (-1);
 179         else
 180                 return (0);
 181 }
 182
 183 /*
 184  * Returns:
 185  *       0 on success
 186  *      <0 failure
 187  *       1 if DBM_INSERT and entry exists
 188  */
 189 extern int
 190 dbm_store(db, key, data, flags)
 191         DBM *db;
 192         datum key, data;
 193         int flags;
 194 {
 195         DBT dbtkey, dbtdata;
 196
 197         dbtkey.data = key.dptr;
 198         dbtkey.size = key.dsize;
 199         dbtdata.data = data.dptr;
 200         dbtdata.size = data.dsize;
 201         return ((db->put)(db, &dbtkey, &dbtdata,
 202             (flags == DBM_INSERT) ? R_NOOVERWRITE : 0));
 203 }
 204
 205 extern int
 206 dbm_error(db)
 207         DBM *db;
 208 {
 209         HTAB *hp;
 210
 211         hp = (HTAB *)db->internal;
 212         return (hp->error);
 213 }
 214
 215 extern int
 216 dbm_clearerr(db)
 217         DBM *db;
 218 {
 219         HTAB *hp;
 220
 221         hp = (HTAB *)db->internal;
 222         hp->error = 0;
 223         return (0);
 224 }
 225
 226 extern int
 227 dbm_dirfno(db)
 228         DBM *db;
 229 {
 230         return(((HTAB *)db->internal)->fp);
 231 }