makedbm.tproj/ypdb.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * This file contains Original Code and/or Modifications of Original Code
   7  * as defined in and that are subject to the Apple Public Source License
   8  * Version 2.0 (the 'License'). You may not use this file except in
   9  * compliance with the License. Please obtain a copy of the License at
  10  * http://www.opensource.apple.com/apsl/ and read it before using this
  11  * file.
  12  *
  13  * The Original Code and all software distributed under the License are
  14  * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  15  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  16  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  17  * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
  18  * Please see the License for the specific language governing rights and
  19  * limitations under the License.
  20  *
  21  * @APPLE_LICENSE_HEADER_END@
  22  */
  23 /*      $OpenBSD: ypdb.c,v 1.5 1997/02/09 09:49:36 maja Exp $ */
  24
  25 /*
  26  * Copyright (c) 1990, 1993
  27  *      The Regents of the University of California.  All rights reserved.
  28  * All rights reserved.
  29  *
  30  * This code is derived from software contributed to Berkeley by
  31  * Margo Seltzer.
  32  *
  33  * This code is derived from ndbm module of BSD4.4 db (hash) by
  34  * Mats O Jansson
  35  *
  36  * Redistribution and use in source and binary forms, with or without
  37  * modification, are permitted provided that the following conditions
  38  * are met:
  39  * 1. Redistributions of source code must retain the above copyright
  40  *    notice, this list of conditions and the following disclaimer.
  41  * 2. Redistributions in binary form must reproduce the above copyright
  42  *    notice, this list of conditions and the following disclaimer in the
  43  *    documentation and/or other materials provided with the distribution.
  44  * 3. All advertising materials mentioning features or use of this software
  45  *    must display the following acknowledgement:
  46  *      This product includes software developed by the University of
  47  *      California, Berkeley and its contributors.
  48  * 4. Neither the name of the University nor the names of its contributors
  49  *    may be used to endorse or promote products derived from this software
  50  *    without specific prior written permission.
  51  *
  52  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
  53  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  54  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  55  * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
  56  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  57  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  58  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  59  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  60  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  61  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  62  * SUCH DAMAGE.
  63  */
  64
  65 #include <sys/param.h>
  66 #include <sys/types.h>
  67 #include <stdio.h>
  68 #include <string.h>
  69
  70 #include "ypdb.h"
  71
  72 #ifdef YPDB_PATCH
  73 extern DBM *__hash_open();
  74 #else
  75 extern DBM *__bt_open();
  76 #endif
  77
  78 /*
  79  * Returns:
  80  *      *DBM on success
  81  *       NULL on failure
  82  */
  83
  84 extern DBM *
  85 ypdb_open(file, flags, mode)
  86         const char *file;
  87         int flags, mode;
  88 {
  89 #ifdef YPDB_PATCH
  90         HASHINFO info;
  91         char path[MAXPATHLEN];
  92
  93         info.bsize = 4096;
  94         info.ffactor = 40;
  95         info.nelem = 1;
  96         info.cachesize = NULL;
  97         info.hash = NULL;
  98         info.lorder = 0;
  99         snprintf(path, sizeof(path), "%s%s", file, YPDB_SUFFIX);
 100         return ((DBM *)__hash_open(path, flags, mode, &info, 0));
 101 #else
 102         BTREEINFO info;
 103         char path[MAXPATHLEN];
 104         DBM *db;
 105
 106         info.flags = 0;
 107         info.cachesize = 0;
 108         info.maxkeypage = 0;
 109         info.minkeypage = 0;
 110         info.psize = 0;
 111         info.compare = NULL;
 112         info.prefix = NULL;
 113         info.lorder = 0;
 114         snprintf(path, sizeof(path), "%s%s", file, YPDB_SUFFIX);
 115         db = (DBM *)__bt_open(path, flags, mode, &info, 0);
 116         return (db);
 117 #endif
 118 }
 119
 120 /*
 121  * Returns:
 122  *      *DBM on success
 123  *       NULL on failure
 124  */
 125
 126 extern DBM *
 127 ypdb_open_suf(file, flags, mode)
 128         const char *file;
 129         int flags, mode;
 130 {
 131 #ifdef YPDB_PATCH
 132         HASHINFO info;
 133
 134         info.bsize = 4096;
 135         info.ffactor = 40;
 136         info.nelem = 1;
 137         info.cachesize = NULL;
 138         info.hash = NULL;
 139         info.lorder = 0;
 140         return ((DBM *)__hash_open(file, flags, mode, &info, 0));
 141 #else
 142         BTREEINFO info;
 143         DBM *db;
 144
 145         info.flags = 0;
 146         info.cachesize = 0;
 147         info.maxkeypage = 0;
 148         info.minkeypage = 0;
 149         info.psize = 0;
 150         info.compare = NULL;
 151         info.prefix = NULL;
 152         info.lorder = 0;
 153         db = (DBM *)__bt_open(file, flags, mode, &info, 0);
 154         return (db);
 155 #endif
 156 }
 157
 158 extern void
 159 ypdb_close(db)
 160         DBM *db;
 161 {
 162         (void)(db->close)(db);
 163 }
 164
 165 /*
 166  * Returns:
 167  *      DATUM on success
 168  *      NULL on failure
 169  */
 170
 171 extern datum
 172 ypdb_fetch(db, key)
 173         DBM *db;
 174         datum key;
 175 {
 176         datum retval;
 177         int status;
 178
 179         status = (db->get)(db, (DBT *)&key, (DBT *)&retval, 0);
 180         if (status) {
 181                 retval.dptr = NULL;
 182                 retval.dsize = 0;
 183         }
 184         return (retval);
 185 }
 186
 187 /*
 188  * Returns:
 189  *      DATUM on success
 190  *      NULL on failure
 191  */
 192
 193 extern datum
 194 ypdb_firstkey(db)
 195         DBM *db;
 196 {
 197         int status;
 198         datum retdata, retkey;
 199
 200         status = (db->seq)(db, (DBT *)&retkey, (DBT *)&retdata, R_FIRST);
 201         if (status)
 202                 retkey.dptr = NULL;
 203         return (retkey);
 204 }
 205
 206 /*
 207  * Returns:
 208  *      DATUM on success
 209  *      NULL on failure
 210  */
 211
 212 extern datum
 213 ypdb_nextkey(db)
 214         DBM *db;
 215 {
 216         int status;
 217         datum retdata, retkey;
 218
 219         status = (db->seq)(db, (DBT *)&retkey, (DBT *)&retdata, R_NEXT);
 220         if (status)
 221                 retkey.dptr = NULL;
 222         return (retkey);
 223 }
 224
 225 /*
 226  * Returns:
 227  *      DATUM on success
 228  *      NULL on failure
 229  */
 230
 231 extern datum
 232 ypdb_setkey(db, key)
 233         DBM *db;
 234         datum key;
 235 {
 236         int status;
 237         datum retdata;
 238 #ifdef YPDB_PATCH
 239         datum retkey;
 240
 241         status = (db->seq)(db, (DBT *)&retkey, (DBT *)&retdata, R_FIRST);
 242         if (status)
 243                 retkey.dptr = NULL;
 244         while ((retkey.dptr != NULL) &&
 245                ((retkey.dsize != key.dsize) ||
 246                 (strncmp(key.dptr,retkey.dptr,retkey.dsize) != 0))) {
 247           status = (db->seq)(db, (DBT *)&retkey, (DBT *)&retdata, R_NEXT);
 248           if (status)
 249                 retkey.dptr = NULL;
 250         };
 251         return (retkey);
 252 #else
 253         status = (db->seq)(db, (DBT *)&key, (DBT *)&retdata, R_CURSOR);
 254         if (status)
 255                 key.dptr = NULL;
 256         return (key);
 257 #endif
 258 }
 259
 260 /*
 261  * Returns:
 262  *       0 on success
 263  *      <0 failure
 264  */
 265
 266 int
 267 ypdb_delete(db, key)
 268         DBM *db;
 269         datum key;
 270 {
 271         int status;
 272
 273         status = (db->del)(db, (DBT *)&key, 0);
 274         if (status)
 275                 return (-1);
 276         else
 277                 return (0);
 278 }
 279
 280 /*
 281  * Returns:
 282  *       0 on success
 283  *      <0 failure
 284  *       1 if YPDB_INSERT and entry exists
 285  */
 286
 287 int
 288 ypdb_store(db, key, content, flags)
 289         DBM *db;
 290         datum key, content;
 291         int flags;
 292 {
 293         return ((db->put)(db, (DBT *)&key, (DBT *)&content,
 294             (flags == YPDB_INSERT) ? R_NOOVERWRITE : 0));
 295 }
 296