newlib/libc/search/ndbm.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-3-Clause
   3  *
   4  * Copyright (c) 1990, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * This code is derived from software contributed to Berkeley by
   8  * Margo Seltzer.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. Redistributions in binary form must reproduce the above copyright
  16  *    notice, this list of conditions and the following disclaimer in the
  17  *    documentation and/or other materials provided with the distribution.
  18  * 3. Neither the name of the University nor the names of its contributors
  19  *    may be used to endorse or promote products derived from this software
  20  *    without specific prior written permission.
  21  *
  22  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  23  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  24  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  25  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  26  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  27  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  28  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  29  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  30  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  31  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  32  * SUCH DAMAGE.
  33  */
  34
  35 #if defined(LIBC_SCCS) && !defined(lint)
  36 static char sccsid[] = "@(#)ndbm.c      8.4 (Berkeley) 7/21/94";
  37 #endif /* LIBC_SCCS and not lint */
  38 #include <sys/cdefs.h>
  39 __FBSDID("$FreeBSD$ : src/lib/libc/db/hash/ndbm.c Nov 20 19:49:47 2017 UTC by pfg - SVN Revision 326025");
  40
  41 /*
  42  * This package provides a dbm compatible interface to the new hashing
  43  * package described in db(3).
  44  */
  45
  46 #include <sys/param.h>
  47
  48 #include <stdio.h>
  49 #include <string.h>
  50 #include <errno.h>
  51
  52 #include <ndbm.h>
  53 #include "hash.h"
  54
  55 #define __DBINTERFACE_PRIVATE        /* activate prototypes from db_local.h */
  56 #include "db_local.h"
  57
  58 /*
  59  * Returns:
  60  *      *DBM on success
  61  *       NULL on failure
  62  */
  63 extern DBM *
  64 dbm_open(const char *file, int flags, mode_t mode)
  65 {
  66         HASHINFO info;
  67         char path[MAXPATHLEN];
  68
  69         info.bsize = 4096;
  70         info.ffactor = 40;
  71         info.nelem = 1;
  72         info.cachesize = 0;
  73         info.hash = NULL;
  74         info.lorder = 0;
  75
  76         if( strlen(file) >= sizeof(path) - strlen(DBM_SUFFIX)) {
  77                 errno = ENAMETOOLONG;
  78                 return(NULL);
  79         }
  80         (void)strcpy(path, file);
  81         (void)strcat(path, DBM_SUFFIX);
  82         return ((DBM *)__hash_open(path, flags, mode, 0, &info));
  83 }
  84
  85 extern void
  86 dbm_close(DBM *db)
  87 {
  88         (void)(db->close)(db);
  89 }
  90
  91 /*
  92  * Returns:
  93  *      DATUM on success
  94  *      NULL on failure
  95  */
  96 extern datum
  97 dbm_fetch(DBM *db, datum key)
  98 {
  99         datum retdata;
 100         int status;
 101         DBT dbtkey, dbtretdata;
 102
 103         dbtkey.data = key.dptr;
 104         dbtkey.size = key.dsize;
 105         status = (db->get)(db, &dbtkey, &dbtretdata, 0);
 106         if (status) {
 107                 dbtretdata.data = NULL;
 108                 dbtretdata.size = 0;
 109         }
 110         retdata.dptr = dbtretdata.data;
 111         retdata.dsize = dbtretdata.size;
 112         return (retdata);
 113 }
 114
 115 /*
 116  * Returns:
 117  *      DATUM on success
 118  *      NULL on failure
 119  */
 120 extern datum
 121 dbm_firstkey(DBM *db)
 122 {
 123         int status;
 124         datum retkey;
 125         DBT dbtretkey, dbtretdata;
 126
 127         status = (db->seq)(db, &dbtretkey, &dbtretdata, R_FIRST);
 128         if (status)
 129                 dbtretkey.data = NULL;
 130         retkey.dptr = dbtretkey.data;
 131         retkey.dsize = dbtretkey.size;
 132         return (retkey);
 133 }
 134
 135 /*
 136  * Returns:
 137  *      DATUM on success
 138  *      NULL on failure
 139  */
 140 extern datum
 141 dbm_nextkey(DBM *db)
 142 {
 143         int status;
 144         datum retkey;
 145         DBT dbtretkey, dbtretdata;
 146
 147         status = (db->seq)(db, &dbtretkey, &dbtretdata, R_NEXT);
 148         if (status)
 149                 dbtretkey.data = NULL;
 150         retkey.dptr = dbtretkey.data;
 151         retkey.dsize = dbtretkey.size;
 152         return (retkey);
 153 }
 154
 155 /*
 156  * Returns:
 157  *       0 on success
 158  *      <0 failure
 159  */
 160 extern int
 161 dbm_delete(DBM *db, datum key)
 162 {
 163         int status;
 164         DBT dbtkey;
 165
 166         dbtkey.data = key.dptr;
 167         dbtkey.size = key.dsize;
 168         status = (db->del)(db, &dbtkey, 0);
 169         if (status)
 170                 return (-1);
 171         else
 172                 return (0);
 173 }
 174
 175 /*
 176  * Returns:
 177  *       0 on success
 178  *      <0 failure
 179  *       1 if DBM_INSERT and entry exists
 180  */
 181 extern int
 182 dbm_store(DBM *db, datum key, datum data, int flags)
 183 {
 184         DBT dbtkey, dbtdata;
 185
 186         dbtkey.data = key.dptr;
 187         dbtkey.size = key.dsize;
 188         dbtdata.data = data.dptr;
 189         dbtdata.size = data.dsize;
 190         return ((db->put)(db, &dbtkey, &dbtdata,
 191             (flags == DBM_INSERT) ? R_NOOVERWRITE : 0));
 192 }
 193
 194 extern int
 195 dbm_error(DBM *db)
 196 {
 197         HTAB *hp;
 198
 199         hp = (HTAB *)db->internal;
 200         return (hp->error);
 201 }
 202
 203 extern int
 204 dbm_clearerr(DBM *db)
 205 {
 206         HTAB *hp;
 207
 208         hp = (HTAB *)db->internal;
 209         hp->error = 0;
 210         return (0);
 211 }
 212
 213 extern int
 214 dbm_dirfno(DBM *db)
 215 {
 216         return(((HTAB *)db->internal)->fp);
 217 }