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 #include <config.h>
  35
  36 #include "ndbm_wrap.h"
  37 #if defined(HAVE_DB4_DB_H)
  38 #include <db4/db.h>
  39 #elif defined(HAVE_DB3_DB_H)
  40 #include <db3/db.h>
  41 #else
  42 #include <db.h>
  43 #endif
  44
  45 #include <stdio.h>
  46 #include <stdlib.h>
  47 #include <string.h>
  48 #include <fcntl.h>
  49
  50 /* XXX undefine open so this works on Solaris with large file support */
  51 #undef open
  52
  53 #define DBT2DATUM(DBT, DATUM) do { (DATUM)->dptr = (DBT)->data; (DATUM)->dsize = (DBT)->size; } while(0)
  54 #define DATUM2DBT(DATUM, DBT) do { (DBT)->data = (DATUM)->dptr; (DBT)->size = (DATUM)->dsize; } while(0)
  55 #define RETURN(X) return ((X) == 0) ? 0 : -1
  56
  57 #ifdef HAVE_DB3
  58 static DBC *cursor;
  59 #endif
  60
  61 #define D(X) ((DB*)(X))
  62
  63 ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
  64 dbm_close (DBM *db)
  65 {
  66 #ifdef HAVE_DB3
  67     D(db)->close(D(db), 0);
  68     cursor = NULL;
  69 #else
  70     D(db)->close(D(db));
  71 #endif
  72 }
  73
  74 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
  75 dbm_delete (DBM *db, datum dkey)
  76 {
  77     DBT key;
  78     DATUM2DBT(&dkey, &key);
  79 #ifdef HAVE_DB3
  80     RETURN(D(db)->del(D(db), NULL, &key, 0));
  81 #else
  82     RETURN(D(db)->del(D(db), &key, 0));
  83 #endif
  84 }
  85
  86 datum
  87 dbm_fetch (DBM *db, datum dkey)
  88 {
  89     datum dvalue;
  90     DBT key, value;
  91     DATUM2DBT(&dkey, &key);
  92     if(D(db)->get(D(db),
  93 #ifdef HAVE_DB3
  94                NULL,
  95 #endif
  96                &key, &value, 0) != 0) {
  97         dvalue.dptr = NULL;
  98         dvalue.dsize = 0;
  99     }
 100     else
 101         DBT2DATUM(&value, &dvalue);
 102
 103     return dvalue;
 104 }
 105
 106 static datum
 107 dbm_get (DB *db, int flags)
 108 {
 109     DBT key, value;
 110     datum datum;
 111 #ifdef HAVE_DB3
 112     if(cursor == NULL)
 113         db->cursor(db, NULL, &cursor, 0);
 114     if(cursor->c_get(cursor, &key, &value, flags) != 0) {
 115         datum.dptr = NULL;
 116         datum.dsize = 0;
 117     } else
 118         DBT2DATUM(&value, &datum);
 119 #else
 120     db->seq(db, &key, &value, flags);
 121 #endif
 122     return datum;
 123 }
 124
 125 #ifndef DB_FIRST
 126 #define DB_FIRST        R_FIRST
 127 #define DB_NEXT         R_NEXT
 128 #define DB_NOOVERWRITE  R_NOOVERWRITE
 129 #define DB_KEYEXIST     1
 130 #endif
 131
 132 ROKEN_LIB_FUNCTION datum ROKEN_LIB_CALL
 133 dbm_firstkey (DBM *db)
 134 {
 135     return dbm_get(D(db), DB_FIRST);
 136 }
 137
 138 ROKEN_LIB_FUNCTION datum ROKEN_LIB_CALL
 139 dbm_nextkey (DBM *db)
 140 {
 141     return dbm_get(D(db), DB_NEXT);
 142 }
 143
 144 ROKEN_LIB_FUNCTION DBM* ROKEN_LIB_CALL
 145 dbm_open (const char *file, int flags, mode_t mode)
 146 {
 147     DB *db;
 148     int myflags = 0;
 149     char *fn = malloc(strlen(file) + 4);
 150     if(fn == NULL)
 151         return NULL;
 152     strcpy(fn, file);
 153     strcat(fn, ".db");
 154 #ifdef HAVE_DB3
 155     if (flags & O_CREAT)
 156         myflags |= DB_CREATE;
 157
 158     if (flags & O_EXCL)
 159         myflags |= DB_EXCL;
 160
 161     if (flags & O_RDONLY)
 162         myflags |= DB_RDONLY;
 163
 164     if (flags & O_TRUNC)
 165         myflags |= DB_TRUNCATE;
 166     if(db_create(&db, NULL, 0) != 0) {
 167         free(fn);
 168         return NULL;
 169     }
 170
 171 #if (DB_VERSION_MAJOR > 3) && (DB_VERSION_MINOR > 0)
 172     if(db->open(db, NULL, fn, NULL, DB_BTREE, myflags, mode) != 0) {
 173 #else
 174     if(db->open(db, fn, NULL, DB_BTREE, myflags, mode) != 0) {
 175 #endif
 176         free(fn);
 177         db->close(db, 0);
 178         return NULL;
 179     }
 180 #else
 181     db = dbopen(fn, flags, mode, DB_BTREE, NULL);
 182 #endif
 183     free(fn);
 184     return (DBM*)db;
 185 }
 186
 187 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
 188 dbm_store (DBM *db, datum dkey, datum dvalue, int flags)
 189 {
 190     int ret;
 191     DBT key, value;
 192     int myflags = 0;
 193     if((flags & DBM_REPLACE) == 0)
 194         myflags |= DB_NOOVERWRITE;
 195     DATUM2DBT(&dkey, &key);
 196     DATUM2DBT(&dvalue, &value);
 197     ret = D(db)->put(D(db),
 198 #ifdef HAVE_DB3
 199                      NULL,
 200 #endif
 201 &key, &value, myflags);
 202     if(ret == DB_KEYEXIST)
 203         return 1;
 204     RETURN(ret);
 205 }
 206
 207 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
 208 dbm_error (DBM *db)
 209 {
 210     return 0;
 211 }
 212
 213 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
 214 dbm_clearerr (DBM *db)
 215 {
 216     return 0;
 217 }
 218