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 <ndbm.h>
  51 #include "hash.h"
  52
  53 /*
  54  * Returns:
  55  *      *DBM on success
  56  *       NULL on failure
  57  */
  58 extern DBM *
  59 dbm_open(file, flags, mode)
  60         const char *file;
  61         int flags, mode;
  62 {
  63         HASHINFO info;
  64         char path[MAXPATHLEN];
  65
  66         info.bsize = 4096;
  67         info.ffactor = 40;
  68         info.nelem = 1;
  69         info.cachesize = 0;
  70         info.hash = NULL;
  71         info.lorder = 0;
  72
  73         if( strlen(file) >= sizeof(path) - strlen(DBM_SUFFIX)) {
  74                 errno = ENAMETOOLONG;
  75                 return(NULL);
  76         }
  77         (void)strcpy(path, file);
  78         (void)strcat(path, DBM_SUFFIX);
  79         return ((DBM *)__hash_open(path, flags, mode, &info, 0));
  80 }
  81
  82 extern void
  83 dbm_close(db)
  84         DBM *db;
  85 {
  86         (void)(db->close)(db);
  87 }
  88
  89 /*
  90  * Returns:
  91  *      DATUM on success
  92  *      NULL on failure
  93  */
  94 extern datum
  95 dbm_fetch(db, key)
  96         DBM *db;
  97         datum key;
  98 {
  99         datum retdata;
 100         int status;
 101         DBT dbtkey, dbtretdata;
 102
 103         dbtkey.data = key.dptr;
 104         dbtkey.size = key.dsize;
 105         status = (db->get)(db, &dbtkey, &dbtretdata, 0);
 106         if (status) {
 107                 dbtretdata.data = NULL;
 108                 dbtretdata.size = 0;
 109         }
 110         retdata.dptr = dbtretdata.data;
 111         retdata.dsize = dbtretdata.size;
 112         return (retdata);
 113 }
 114
 115 /*
 116  * Returns:
 117  *      DATUM on success
 118  *      NULL on failure
 119  */
 120 extern datum
 121 dbm_firstkey(db)
 122         DBM *db;
 123 {
 124         int status;
 125         datum retkey;
 126         DBT dbtretkey, dbtretdata;
 127
 128         status = (db->seq)(db, &dbtretkey, &dbtretdata, R_FIRST);
 129         if (status)
 130                 dbtretkey.data = NULL;
 131         retkey.dptr = dbtretkey.data;
 132         retkey.dsize = dbtretkey.size;
 133         return (retkey);
 134 }
 135
 136 /*
 137  * Returns:
 138  *      DATUM on success
 139  *      NULL on failure
 140  */
 141 extern datum
 142 dbm_nextkey(db)
 143         DBM *db;
 144 {
 145         int status;
 146         datum retkey;
 147         DBT dbtretkey, dbtretdata;
 148
 149         status = (db->seq)(db, &dbtretkey, &dbtretdata, R_NEXT);
 150         if (status)
 151                 dbtretkey.data = NULL;
 152         retkey.dptr = dbtretkey.data;
 153         retkey.dsize = dbtretkey.size;
 154         return (retkey);
 155 }
 156
 157 /*
 158  * Returns:
 159  *       0 on success
 160  *      <0 failure
 161  */
 162 extern int
 163 dbm_delete(db, key)
 164         DBM *db;
 165         datum key;
 166 {
 167         int status;
 168         DBT dbtkey;
 169
 170         dbtkey.data = key.dptr;
 171         dbtkey.size = key.dsize;
 172         status = (db->del)(db, &dbtkey, 0);
 173         if (status)
 174                 return (-1);
 175         else
 176                 return (0);
 177 }
 178
 179 /*
 180  * Returns:
 181  *       0 on success
 182  *      <0 failure
 183  *       1 if DBM_INSERT and entry exists
 184  */
 185 extern int
 186 dbm_store(db, key, data, flags)
 187         DBM *db;
 188         datum key, data;
 189         int flags;
 190 {
 191         DBT dbtkey, dbtdata;
 192
 193         dbtkey.data = key.dptr;
 194         dbtkey.size = key.dsize;
 195         dbtdata.data = data.dptr;
 196         dbtdata.size = data.dsize;
 197         return ((db->put)(db, &dbtkey, &dbtdata,
 198             (flags == DBM_INSERT) ? R_NOOVERWRITE : 0));
 199 }
 200
 201 extern int
 202 dbm_error(db)
 203         DBM *db;
 204 {
 205         HTAB *hp;
 206
 207         hp = (HTAB *)db->internal;
 208         return (hp->error);
 209 }
 210
 211 extern int
 212 dbm_clearerr(db)
 213         DBM *db;
 214 {
 215         HTAB *hp;
 216
 217         hp = (HTAB *)db->internal;
 218         hp->error = 0;
 219         return (0);
 220 }
 221
 222 extern int
 223 dbm_dirfno(db)
 224         DBM *db;
 225 {
 226         return(((HTAB *)db->internal)->fp);
 227 }