lib/libc/db/hash/ndbmdatum.c

   1 /*      $NetBSD: ndbmdatum.c,v 1.4 2008/09/11 12:58:00 joerg Exp $      */
   2 /*      from: NetBSD: ndbm.c,v 1.18 2004/04/27 20:03:45 kleink Exp      */
   3
   4 /*-
   5  * Copyright (c) 1990, 1993
   6  *      The Regents of the University of California.  All rights reserved.
   7  *
   8  * This code is derived from software contributed to Berkeley by
   9  * Margo Seltzer.
  10  *
  11  * Redistribution and use in source and binary forms, with or without
  12  * modification, are permitted provided that the following conditions
  13  * are met:
  14  * 1. Redistributions of source code must retain the above copyright
  15  *    notice, this list of conditions and the following disclaimer.
  16  * 2. Redistributions in binary form must reproduce the above copyright
  17  *    notice, this list of conditions and the following disclaimer in the
  18  *    documentation and/or other materials provided with the distribution.
  19  * 3. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  24  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  25  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  26  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  27  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  28  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  29  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  30  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  31  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  32  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  33  * SUCH DAMAGE.
  34  */
  35
  36 #if HAVE_NBTOOL_CONFIG_H
  37 #include "nbtool_config.h"
  38 #endif
  39
  40 #include <sys/cdefs.h>
  41 __RCSID("$NetBSD: ndbmdatum.c,v 1.4 2008/09/11 12:58:00 joerg Exp $");
  42
  43 /*
  44  * This package provides a dbm compatible interface to the new hashing
  45  * package described in db(3).
  46  */
  47 #include "namespace.h"
  48 #include <sys/param.h>
  49
  50 #include <fcntl.h>
  51 #include <stdio.h>
  52 #include <string.h>
  53
  54 #include <ndbm.h>
  55 #include "hash.h"
  56
  57 /*
  58  * Returns:
  59  *      DATUM on success
  60  *      NULL on failure
  61  */
  62 datum
  63 dbm_fetch(DBM *db, datum key)
  64 {
  65         datum retdata;
  66         int status;
  67         DBT dbtkey, dbtretdata;
  68
  69         dbtkey.data = key.dptr;
  70         dbtkey.size = key.dsize;
  71         status = (db->get)(db, &dbtkey, &dbtretdata, 0);
  72         if (status) {
  73                 dbtretdata.data = NULL;
  74                 dbtretdata.size = 0;
  75         }
  76         retdata.dptr = dbtretdata.data;
  77         retdata.dsize = dbtretdata.size;
  78         return (retdata);
  79 }
  80
  81 /*
  82  * Returns:
  83  *      DATUM on success
  84  *      NULL on failure
  85  */
  86 datum
  87 dbm_firstkey(DBM *db)
  88 {
  89         int status;
  90         datum retkey;
  91         DBT dbtretkey, dbtretdata;
  92
  93         status = (db->seq)(db, &dbtretkey, &dbtretdata, R_FIRST);
  94         if (status)
  95                 dbtretkey.data = NULL;
  96         retkey.dptr = dbtretkey.data;
  97         retkey.dsize = dbtretkey.size;
  98         return (retkey);
  99 }
 100
 101 /*
 102  * Returns:
 103  *      DATUM on success
 104  *      NULL on failure
 105  */
 106 datum
 107 dbm_nextkey(DBM *db)
 108 {
 109         int status;
 110         datum retkey;
 111         DBT dbtretkey, dbtretdata;
 112
 113         status = (db->seq)(db, &dbtretkey, &dbtretdata, R_NEXT);
 114         if (status)
 115                 dbtretkey.data = NULL;
 116         retkey.dptr = dbtretkey.data;
 117         retkey.dsize = dbtretkey.size;
 118         return (retkey);
 119 }
 120
 121 /*
 122  * Returns:
 123  *       0 on success
 124  *      <0 failure
 125  */
 126 int
 127 dbm_delete(DBM *db, datum key)
 128 {
 129         int status;
 130         DBT dbtkey;
 131
 132         dbtkey.data = key.dptr;
 133         dbtkey.size = key.dsize;
 134         status = (db->del)(db, &dbtkey, 0);
 135         if (status)
 136                 return (-1);
 137         else
 138                 return (0);
 139 }
 140
 141 /*
 142  * Returns:
 143  *       0 on success
 144  *      <0 failure
 145  *       1 if DBM_INSERT and entry exists
 146  */
 147 int
 148 dbm_store(DBM *db, datum key, datum data, int flags)
 149 {
 150         DBT dbtkey, dbtdata;
 151
 152         dbtkey.data = key.dptr;
 153         dbtkey.size = key.dsize;
 154         dbtdata.data = data.dptr;
 155         dbtdata.size = data.dsize;
 156         return ((db->put)(db, &dbtkey, &dbtdata,
 157             (u_int)((flags == DBM_INSERT) ? R_NOOVERWRITE : 0)));
 158 }