lib/roken/ndbm_wrap.c

   1 /*
   2  * Copyright (c) 2002 Kungliga Tekniska Högskolan
   3  * (Royal Institute of Technology, Stockholm, Sweden).
   4  * All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  *
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  *
  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  *
  17  * 3. Neither the name of the Institute nor the names of its contributors
  18  *    may be used to endorse or promote products derived from this software
  19  *    without specific prior written permission.
  20  *
  21  * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
  22  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  23  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24  * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
  25  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  27  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  28  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  29  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  30  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  31  * SUCH DAMAGE.
  32  */
  33
  34 #ifdef HAVE_CONFIG_H
  35 #include <config.h>
  36 RCSID("$Id$");
  37 #endif
  38
  39 #include "ndbm_wrap.h"
  40 #if defined(HAVE_DB4_DB_H)
  41 #include <db4/db.h>
  42 #elif defined(HAVE_DB3_DB_H)
  43 #include <db3/db.h>
  44 #else
  45 #include <db.h>
  46 #endif
  47
  48 #include <stdio.h>
  49 #include <stdlib.h>
  50 #include <string.h>
  51 #include <fcntl.h>
  52
  53 /* XXX undefine open so this works on Solaris with large file support */
  54 #undef open
  55
  56 #define DBT2DATUM(DBT, DATUM) do { (DATUM)->dptr = (DBT)->data; (DATUM)->dsize = (DBT)->size; } while(0)
  57 #define DATUM2DBT(DATUM, DBT) do { (DBT)->data = (DATUM)->dptr; (DBT)->size = (DATUM)->dsize; } while(0)
  58 #define RETURN(X) return ((X) == 0) ? 0 : -1
  59
  60 #ifdef HAVE_DB3
  61 static DBC *cursor;
  62 #endif
  63
  64 #define D(X) ((DB*)(X))
  65
  66 void ROKEN_LIB_FUNCTION
  67 dbm_close (DBM *db)
  68 {
  69 #ifdef HAVE_DB3
  70     D(db)->close(D(db), 0);
  71     cursor = NULL;
  72 #else
  73     D(db)->close(D(db));
  74 #endif
  75 }
  76
  77 int ROKEN_LIB_FUNCTION
  78 dbm_delete (DBM *db, datum dkey)
  79 {
  80     DBT key;
  81     DATUM2DBT(&dkey, &key);
  82 #ifdef HAVE_DB3
  83     RETURN(D(db)->del(D(db), NULL, &key, 0));
  84 #else
  85     RETURN(D(db)->del(D(db), &key, 0));
  86 #endif
  87 }
  88
  89 datum
  90 dbm_fetch (DBM *db, datum dkey)
  91 {
  92     datum dvalue;
  93     DBT key, value;
  94     DATUM2DBT(&dkey, &key);
  95     if(D(db)->get(D(db),
  96 #ifdef HAVE_DB3
  97                NULL,
  98 #endif
  99                &key, &value, 0) != 0) {
 100         dvalue.dptr = NULL;
 101         dvalue.dsize = 0;
 102     }
 103     else
 104         DBT2DATUM(&value, &dvalue);
 105
 106     return dvalue;
 107 }
 108
 109 static datum
 110 dbm_get (DB *db, int flags)
 111 {
 112     DBT key, value;
 113     datum datum;
 114 #ifdef HAVE_DB3
 115     if(cursor == NULL)
 116         db->cursor(db, NULL, &cursor, 0);
 117     if(cursor->c_get(cursor, &key, &value, flags) != 0) {
 118         datum.dptr = NULL;
 119         datum.dsize = 0;
 120     } else
 121         DBT2DATUM(&value, &datum);
 122 #else
 123     db->seq(db, &key, &value, flags);
 124 #endif
 125     return datum;
 126 }
 127
 128 #ifndef DB_FIRST
 129 #define DB_FIRST        R_FIRST
 130 #define DB_NEXT         R_NEXT
 131 #define DB_NOOVERWRITE  R_NOOVERWRITE
 132 #define DB_KEYEXIST     1
 133 #endif
 134
 135 datum ROKEN_LIB_FUNCTION
 136 dbm_firstkey (DBM *db)
 137 {
 138     return dbm_get(D(db), DB_FIRST);
 139 }
 140
 141 datum ROKEN_LIB_FUNCTION
 142 dbm_nextkey (DBM *db)
 143 {
 144     return dbm_get(D(db), DB_NEXT);
 145 }
 146
 147 DBM* ROKEN_LIB_FUNCTION
 148 dbm_open (const char *file, int flags, mode_t mode)
 149 {
 150     DB *db;
 151     int myflags = 0;
 152     char *fn = malloc(strlen(file) + 4);
 153     if(fn == NULL)
 154         return NULL;
 155     strcpy(fn, file);
 156     strcat(fn, ".db");
 157 #ifdef HAVE_DB3
 158     if (flags & O_CREAT)
 159         myflags |= DB_CREATE;
 160
 161     if (flags & O_EXCL)
 162         myflags |= DB_EXCL;
 163
 164     if (flags & O_RDONLY)
 165         myflags |= DB_RDONLY;
 166
 167     if (flags & O_TRUNC)
 168         myflags |= DB_TRUNCATE;
 169     if(db_create(&db, NULL, 0) != 0) {
 170         free(fn);
 171         return NULL;
 172     }
 173
 174 #if (DB_VERSION_MAJOR > 3) && (DB_VERSION_MINOR > 0)
 175     if(db->open(db, NULL, fn, NULL, DB_BTREE, myflags, mode) != 0) {
 176 #else
 177     if(db->open(db, fn, NULL, DB_BTREE, myflags, mode) != 0) {
 178 #endif
 179         free(fn);
 180         db->close(db, 0);
 181         return NULL;
 182     }
 183 #else
 184     db = dbopen(fn, flags, mode, DB_BTREE, NULL);
 185 #endif
 186     free(fn);
 187     return (DBM*)db;
 188 }
 189
 190 int ROKEN_LIB_FUNCTION
 191 dbm_store (DBM *db, datum dkey, datum dvalue, int flags)
 192 {
 193     int ret;
 194     DBT key, value;
 195     int myflags = 0;
 196     if((flags & DBM_REPLACE) == 0)
 197         myflags |= DB_NOOVERWRITE;
 198     DATUM2DBT(&dkey, &key);
 199     DATUM2DBT(&dvalue, &value);
 200     ret = D(db)->put(D(db),
 201 #ifdef HAVE_DB3
 202                      NULL,
 203 #endif
 204 &key, &value, myflags);
 205     if(ret == DB_KEYEXIST)
 206         return 1;
 207     RETURN(ret);
 208 }
 209
 210 int ROKEN_LIB_FUNCTION
 211 dbm_error (DBM *db)
 212 {
 213     return 0;
 214 }
 215
 216 int ROKEN_LIB_FUNCTION
 217 dbm_clearerr (DBM *db)
 218 {
 219     return 0;
 220 }
 221