db/hash/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
  41 /*
  42  * This package provides a dbm compatible interface to the new hashing
  43  * package described in db(3).
  44  */
  45
  46 #include <sys/param.h>
  47
  48 #include <stdio.h>
  49 #include <string.h>
  50 #include <stdlib.h>
  51
  52 #include <ndbm.h>
  53 #include "hash.h"
  54
  55 /*
  56  * Returns:
  57  *      *DBM on success
  58  *       NULL on failure
  59  */
  60 extern DBM *
  61 dbm_open(file, flags, mode)
  62         const char *file;
  63         int flags, mode;
  64 {
  65         DBM *db;
  66         HASHINFO info;
  67         const size_t len = strlen(file) + sizeof (DBM_SUFFIX);
  68 #ifdef __GNUC__
  69         char path[len];
  70 #else
  71         char *path = malloc(len);
  72         if (path == NULL)
  73                 return NULL;
  74 #endif
  75
  76         info.bsize = 4096;
  77         info.ffactor = 40;
  78         info.nelem = 1;
  79         info.cachesize = 0;
  80         info.hash = NULL;
  81         info.lorder = 0;
  82         (void)strcpy(path, file);
  83         (void)strcat(path, DBM_SUFFIX);
  84         db = (DBM *)__hash_open(path, flags, mode, &info, 0);
  85 #ifndef __GNUC__
  86         free(path);
  87 #endif
  88         return db;
  89 }
  90
  91 extern void
  92 dbm_close(db)
  93         DBM *db;
  94 {
  95         (void)(db->close)(db);
  96 }
  97
  98 /*
  99  * Returns:
 100  *      DATUM on success
 101  *      NULL on failure
 102  */
 103 extern datum
 104 dbm_fetch(db, key)
 105         DBM *db;
 106         datum key;
 107 {
 108         datum retval;
 109         int status;
 110
 111         status = (db->get)(db, (DBT *)&key, (DBT *)&retval, 0);
 112         if (status) {
 113                 retval.dptr = NULL;
 114                 retval.dsize = 0;
 115         }
 116         return (retval);
 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 retdata, retkey;
 130
 131         status = (db->seq)(db, (DBT *)&retkey, (DBT *)&retdata, R_FIRST);
 132         if (status)
 133                 retkey.dptr = NULL;
 134         return (retkey);
 135 }
 136
 137 /*
 138  * Returns:
 139  *      DATUM on success
 140  *      NULL on failure
 141  */
 142 extern datum
 143 dbm_nextkey(db)
 144         DBM *db;
 145 {
 146         int status;
 147         datum retdata, retkey;
 148
 149         status = (db->seq)(db, (DBT *)&retkey, (DBT *)&retdata, R_NEXT);
 150         if (status)
 151                 retkey.dptr = NULL;
 152         return (retkey);
 153 }
 154 /*
 155  * Returns:
 156  *       0 on success
 157  *      <0 failure
 158  */
 159 extern int
 160 dbm_delete(db, key)
 161         DBM *db;
 162         datum key;
 163 {
 164         int status;
 165
 166         status = (db->del)(db, (DBT *)&key, 0);
 167         if (status)
 168                 return (-1);
 169         else
 170                 return (0);
 171 }
 172
 173 /*
 174  * Returns:
 175  *       0 on success
 176  *      <0 failure
 177  *       1 if DBM_INSERT and entry exists
 178  */
 179 extern int
 180 dbm_store(db, key, content, flags)
 181         DBM *db;
 182         datum key, content;
 183         int flags;
 184 {
 185         return ((db->put)(db, (DBT *)&key, (DBT *)&content,
 186             (flags == DBM_INSERT) ? R_NOOVERWRITE : 0));
 187 }
 188
 189 extern int
 190 dbm_error(db)
 191         DBM *db;
 192 {
 193         HTAB *hp;
 194
 195         hp = (HTAB *)db->internal;
 196         return (hp->errnum);
 197 }
 198
 199 extern int
 200 dbm_clearerr(db)
 201         DBM *db;
 202 {
 203         HTAB *hp;
 204
 205         hp = (HTAB *)db->internal;
 206         hp->errnum = 0;
 207         return (0);
 208 }
 209
 210 extern int
 211 dbm_dirfno(db)
 212         DBM *db;
 213 {
 214         return(((HTAB *)db->internal)->fp);
 215 }