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_DBHEADER)
  38 #include <db.h>
  39 #elif defined(HAVE_DB5_DB_H)
  40 #include <db5/db.h>
  41 #elif defined(HAVE_DB4_DB_H)
  42 #include <db4/db.h>
  43 #elif defined(HAVE_DB3_DB_H)
  44 #include <db3/db.h>
  45 #else
  46 #include <db.h>
  47 #endif
  48
  49 #include <stdio.h>
  50 #include <stdlib.h>
  51 #include <string.h>
  52 #include <fcntl.h>
  53
  54 /* XXX undefine open so this works on Solaris with large file support */
  55 #undef open
  56
  57 #define DBT2DATUM(DBT, DATUM) do { (DATUM)->dptr = (DBT)->data; (DATUM)->dsize = (DBT)->size; } while(0)
  58 #define DATUM2DBT(DATUM, DBT) do { (DBT)->data = (DATUM)->dptr; (DBT)->size = (DATUM)->dsize; } while(0)
  59 #define RETURN(X) return ((X) == 0) ? 0 : -1
  60
  61 #ifdef HAVE_DB3
  62 static DBC *cursor;
  63 #endif
  64
  65 #define D(X) ((DB*)(X))
  66
  67 ROKEN_LIB_FUNCTION void ROKEN_LIB_CALL
  68 dbm_close (DBM *db)
  69 {
  70 #ifdef HAVE_DB3
  71     D(db)->close(D(db), 0);
  72     cursor = NULL;
  73 #else
  74     D(db)->close(D(db));
  75 #endif
  76 }
  77
  78 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
  79 dbm_delete (DBM *db, datum dkey)
  80 {
  81     DBT key;
  82     DATUM2DBT(&dkey, &key);
  83 #ifdef HAVE_DB3
  84     RETURN(D(db)->del(D(db), NULL, &key, 0));
  85 #else
  86     RETURN(D(db)->del(D(db), &key, 0));
  87 #endif
  88 }
  89
  90 datum
  91 dbm_fetch (DBM *db, datum dkey)
  92 {
  93     datum dvalue;
  94     DBT key, value;
  95     DATUM2DBT(&dkey, &key);
  96     if(D(db)->get(D(db),
  97 #ifdef HAVE_DB3
  98                NULL,
  99 #endif
 100                &key, &value, 0) != 0) {
 101         dvalue.dptr = NULL;
 102         dvalue.dsize = 0;
 103     }
 104     else
 105         DBT2DATUM(&value, &dvalue);
 106
 107     return dvalue;
 108 }
 109
 110 static datum
 111 dbm_get (DB *db, int flags)
 112 {
 113     DBT key, value;
 114     datum datum;
 115 #ifdef HAVE_DB3
 116     if(cursor == NULL)
 117         db->cursor(db, NULL, &cursor, 0);
 118     if(cursor->c_get(cursor, &key, &value, flags) != 0) {
 119         datum.dptr = NULL;
 120         datum.dsize = 0;
 121     } else
 122         DBT2DATUM(&value, &datum);
 123 #else
 124     db->seq(db, &key, &value, flags);
 125 #endif
 126     return datum;
 127 }
 128
 129 #ifndef DB_FIRST
 130 #define DB_FIRST        R_FIRST
 131 #define DB_NEXT         R_NEXT
 132 #define DB_NOOVERWRITE  R_NOOVERWRITE
 133 #define DB_KEYEXIST     1
 134 #endif
 135
 136 ROKEN_LIB_FUNCTION datum ROKEN_LIB_CALL
 137 dbm_firstkey (DBM *db)
 138 {
 139     return dbm_get(D(db), DB_FIRST);
 140 }
 141
 142 ROKEN_LIB_FUNCTION datum ROKEN_LIB_CALL
 143 dbm_nextkey (DBM *db)
 144 {
 145     return dbm_get(D(db), DB_NEXT);
 146 }
 147
 148 ROKEN_LIB_FUNCTION DBM* ROKEN_LIB_CALL
 149 dbm_open (const char *file, int flags, mode_t mode)
 150 {
 151     DB *db;
 152     int myflags = 0;
 153     char *fn = malloc(strlen(file) + 4);
 154     if(fn == NULL)
 155         return NULL;
 156     strcpy(fn, file);
 157     strcat(fn, ".db");
 158 #ifdef HAVE_DB3
 159     if (flags & O_CREAT)
 160         myflags |= DB_CREATE;
 161
 162     if (flags & O_EXCL)
 163         myflags |= DB_EXCL;
 164
 165     if (flags & O_RDONLY)
 166         myflags |= DB_RDONLY;
 167
 168     if (flags & O_TRUNC)
 169         myflags |= DB_TRUNCATE;
 170     if(db_create(&db, NULL, 0) != 0) {
 171         free(fn);
 172         return NULL;
 173     }
 174
 175 #if (DB_VERSION_MAJOR > 3) && (DB_VERSION_MINOR > 0)
 176     if(db->open(db, NULL, fn, NULL, DB_BTREE, myflags, mode) != 0) {
 177 #else
 178     if(db->open(db, fn, NULL, DB_BTREE, myflags, mode) != 0) {
 179 #endif
 180         free(fn);
 181         db->close(db, 0);
 182         return NULL;
 183     }
 184 #else
 185     db = dbopen(fn, flags, mode, DB_BTREE, NULL);
 186 #endif
 187     free(fn);
 188     return (DBM*)db;
 189 }
 190
 191 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
 192 dbm_store (DBM *db, datum dkey, datum dvalue, int flags)
 193 {
 194     int ret;
 195     DBT key, value;
 196     int myflags = 0;
 197     if((flags & DBM_REPLACE) == 0)
 198         myflags |= DB_NOOVERWRITE;
 199     DATUM2DBT(&dkey, &key);
 200     DATUM2DBT(&dvalue, &value);
 201     ret = D(db)->put(D(db),
 202 #ifdef HAVE_DB3
 203                      NULL,
 204 #endif
 205 &key, &value, myflags);
 206     if(ret == DB_KEYEXIST)
 207         return 1;
 208     RETURN(ret);
 209 }
 210
 211 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
 212 dbm_error (DBM *db)
 213 {
 214     return 0;
 215 }
 216
 217 ROKEN_LIB_FUNCTION int ROKEN_LIB_CALL
 218 dbm_clearerr (DBM *db)
 219 {
 220     return 0;
 221 }
 222