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  * 4. Neither the name of the University nor the names of its contributors
  17  *    may be used to endorse or promote products derived from this software
  18  *    without specific prior written permission.
  19  *
  20  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  21  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  22  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  23  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  24  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  25  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  26  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  27  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  28  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  29  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  30  * SUCH DAMAGE.
  31  */
  32
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 static char sccsid[] = "@(#)ndbm.c      8.4 (Berkeley) 7/21/94";
  35 #endif /* LIBC_SCCS and not lint */
  36 #include <sys/cdefs.h>
  37 __FBSDID("$FreeBSD: src/lib/libc/db/hash/ndbm.c,v 1.7 2007/01/09 00:27:51 imp Exp $");
  38
  39 /*
  40  * This package provides a dbm compatible interface to the new hashing
  41  * package described in db(3).
  42  */
  43
  44 #include <sys/param.h>
  45
  46 #include <stdio.h>
  47 #include <string.h>
  48 #include <errno.h>
  49
  50 #include <db.h>
  51 #define _DBM
  52 typedef DB DBM;
  53 #include <ndbm.h>
  54 #include "hash.h"
  55
  56 /*
  57  * Returns:
  58  *      *DBM on success
  59  *       NULL on failure
  60  */
  61 extern DBM *
  62 dbm_open(const char *file, int flags, mode_t mode)
  63 {
  64         HASHINFO info;
  65         char path[MAXPATHLEN];
  66
  67         info.bsize = 4096;
  68         info.ffactor = 40;
  69         info.nelem = 1;
  70         info.cachesize = 0;
  71         info.hash = NULL;
  72         info.lorder = 0;
  73
  74         if( strlen(file) >= sizeof(path) - strlen(DBM_SUFFIX)) {
  75                 errno = ENAMETOOLONG;
  76                 return(NULL);
  77         }
  78         (void)strcpy(path, file);
  79         (void)strcat(path, DBM_SUFFIX);
  80         return ((DBM *)__hash_open(path, flags, mode, &info, 0));
  81 }
  82
  83 extern void
  84 dbm_close(db)
  85         DBM *db;
  86 {
  87         (void)(db->close)(db);
  88 }
  89
  90 /*
  91  * Returns:
  92  *      DATUM on success
  93  *      NULL on failure
  94  */
  95 extern datum
  96 dbm_fetch(db, key)
  97         DBM *db;
  98         datum key;
  99 {
 100         datum retdata;
 101         int status;
 102         DBT dbtkey, dbtretdata;
 103
 104         dbtkey.data = key.dptr;
 105         dbtkey.size = key.dsize;
 106         status = (db->get)(db, &dbtkey, &dbtretdata, 0);
 107         if (status) {
 108                 dbtretdata.data = NULL;
 109                 dbtretdata.size = 0;
 110         }
 111         retdata.dptr = dbtretdata.data;
 112         retdata.dsize = dbtretdata.size;
 113         return (retdata);
 114 }
 115
 116 /*
 117  * Returns:
 118  *      DATUM on success
 119  *      NULL on failure
 120  */
 121 extern datum
 122 dbm_firstkey(db)
 123         DBM *db;
 124 {
 125         int status;
 126         datum retkey;
 127         DBT dbtretkey, dbtretdata;
 128         HTAB *htab = (HTAB *)(db->internal);
 129
 130         status = (db->seq)(db, &dbtretkey, &dbtretdata, R_FIRST);
 131         if (status) {
 132                 dbtretkey.data = NULL;
 133                 htab->nextkey_eof = 1;
 134         } else
 135                 htab->nextkey_eof = 0;
 136         retkey.dptr = dbtretkey.data;
 137         retkey.dsize = dbtretkey.size;
 138         return (retkey);
 139 }
 140
 141 /*
 142  * Returns:
 143  *      DATUM on success
 144  *      NULL on failure
 145  */
 146 extern datum
 147 dbm_nextkey(db)
 148         DBM *db;
 149 {
 150         int status = 1;
 151         datum retkey;
 152         DBT dbtretkey, dbtretdata;
 153         HTAB *htab = (HTAB *)(db->internal);
 154
 155         if (htab->nextkey_eof)
 156                 dbtretkey.data = NULL;
 157         else {
 158                 status = (db->seq)(db, &dbtretkey, &dbtretdata, R_NEXT);
 159                 if (status) {
 160                         dbtretkey.data = NULL;
 161                         htab->nextkey_eof = 1;
 162                 }
 163         }
 164         retkey.dptr = dbtretkey.data;
 165         retkey.dsize = dbtretkey.size;
 166         return (retkey);
 167 }
 168
 169 /*
 170  * Returns:
 171  *       0 on success
 172  *      <0 failure
 173  */
 174 extern int
 175 dbm_delete(db, key)
 176         DBM *db;
 177         datum key;
 178 {
 179         int status;
 180         DBT dbtkey;
 181
 182         dbtkey.data = key.dptr;
 183         dbtkey.size = key.dsize;
 184         status = (db->del)(db, &dbtkey, 0);
 185         if (status)
 186                 return (-1);
 187         else
 188                 return (0);
 189 }
 190
 191 /*
 192  * Returns:
 193  *       0 on success
 194  *      <0 failure
 195  *       1 if DBM_INSERT and entry exists
 196  */
 197 extern int
 198 dbm_store(db, key, data, flags)
 199         DBM *db;
 200         datum key, data;
 201         int flags;
 202 {
 203         DBT dbtkey, dbtdata;
 204
 205         dbtkey.data = key.dptr;
 206         dbtkey.size = key.dsize;
 207         dbtdata.data = data.dptr;
 208         dbtdata.size = data.dsize;
 209         return ((db->put)(db, &dbtkey, &dbtdata,
 210             (flags == DBM_INSERT) ? R_NOOVERWRITE : 0));
 211 }
 212
 213 extern int
 214 dbm_error(db)
 215         DBM *db;
 216 {
 217         HTAB *hp;
 218
 219         hp = (HTAB *)db->internal;
 220         return (hp->error);
 221 }
 222
 223 extern int
 224 dbm_clearerr(db)
 225         DBM *db;
 226 {
 227         HTAB *hp;
 228
 229         hp = (HTAB *)db->internal;
 230         hp->error = 0;
 231         return (0);
 232 }
 233
 234 extern int
 235 dbm_dirfno(db)
 236         DBM *db;
 237 {
 238         return(((HTAB *)db->internal)->fp);
 239 }