NetBSD/lib/libc/db/hash/ndbm.c

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/* $NetBSD: ndbm.c,v 1.15 1998/12/09 12:42:50 christos Exp $ */
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/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
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*
* This code is derived from software contributed to Berkeley by
* Margo Seltzer.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
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#include <sys/cdefs.h>
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#if defined(LIBC_SCCS) && !defined(lint)
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#if 0
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static char sccsid[] = "@(#)ndbm.c 8.4 (Berkeley) 7/21/94";
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#else
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__RCSID("$NetBSD: ndbm.c,v 1.15 1998/12/09 12:42:50 christos Exp $");
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#endif
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#endif /* LIBC_SCCS and not lint */
/*
* This package provides a dbm compatible interface to the new hashing
* package described in db(3).
*/
#include "namespace.h"
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#include <sys/param.h>
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#include <stdio.h>
#include <string.h>
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#include <ndbm.h>
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#include "hash.h"
#ifdef __weak_alias
__weak_alias(dbm_clearerr,_dbm_clearerr);
__weak_alias(dbm_close,_dbm_close);
__weak_alias(dbm_delete,_dbm_delete);
__weak_alias(dbm_dirfno,_dbm_dirfno);
__weak_alias(dbm_error,_dbm_error);
__weak_alias(dbm_fetch,_dbm_fetch);
__weak_alias(dbm_firstkey,_dbm_firstkey);
__weak_alias(dbm_nextkey,_dbm_nextkey);
__weak_alias(dbm_open,_dbm_open);
__weak_alias(dbm_store,_dbm_store);
#endif
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/*
* Returns:
* *DBM on success
* NULL on failure
*/
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extern DBM *
dbm_open(file, flags, mode)
const char *file;
int flags;
mode_t mode;
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{
HASHINFO info;
char path[MAXPATHLEN];
info.bsize = 4096;
info.ffactor = 40;
info.nelem = 1;
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info.cachesize = 0;
info.hash = NULL;
info.lorder = 0;
(void)strncpy(path, file, sizeof(path) - 1);
(void)strncat(path, DBM_SUFFIX, sizeof(path) - strlen(path) - 1);
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return ((DBM *)__hash_open(path, flags, mode, &info, 0));
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}
extern void
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dbm_close(db)
DBM *db;
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{
(void)(db->close)(db);
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}
/*
* Returns:
* DATUM on success
* NULL on failure
*/
extern datum
dbm_fetch(db, key)
DBM *db;
datum key;
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{
datum retdata;
int status;
DBT dbtkey, dbtretdata;
dbtkey.data = key.dptr;
dbtkey.size = key.dsize;
status = (db->get)(db, &dbtkey, &dbtretdata, 0);
if (status) {
dbtretdata.data = NULL;
dbtretdata.size = 0;
}
retdata.dptr = dbtretdata.data;
retdata.dsize = dbtretdata.size;
return (retdata);
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}
/*
* Returns:
* DATUM on success
* NULL on failure
*/
extern datum
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dbm_firstkey(db)
DBM *db;
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{
int status;
datum retkey;
DBT dbtretkey, dbtretdata;
status = (db->seq)(db, &dbtretkey, &dbtretdata, R_FIRST);
if (status)
dbtretkey.data = NULL;
retkey.dptr = dbtretkey.data;
retkey.dsize = dbtretkey.size;
return (retkey);
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}
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/*
* Returns:
* DATUM on success
* NULL on failure
*/
extern datum
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dbm_nextkey(db)
DBM *db;
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{
int status;
datum retkey;
DBT dbtretkey, dbtretdata;
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status = (db->seq)(db, &dbtretkey, &dbtretdata, R_NEXT);
if (status)
dbtretkey.data = NULL;
retkey.dptr = dbtretkey.data;
retkey.dsize = dbtretkey.size;
return (retkey);
}
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/*
* Returns:
* 0 on success
* <0 failure
*/
extern int
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dbm_delete(db, key)
DBM *db;
datum key;
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{
int status;
DBT dbtkey;
dbtkey.data = key.dptr;
dbtkey.size = key.dsize;
status = (db->del)(db, &dbtkey, 0);
if (status)
return (-1);
else
return (0);
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}
/*
* Returns:
* 0 on success
* <0 failure
* 1 if DBM_INSERT and entry exists
*/
extern int
dbm_store(db, key, data, flags)
DBM *db;
datum key, data;
int flags;
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{
DBT dbtkey, dbtdata;
dbtkey.data = key.dptr;
dbtkey.size = key.dsize;
dbtdata.data = data.dptr;
dbtdata.size = data.dsize;
return ((db->put)(db, &dbtkey, &dbtdata,
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(u_int)((flags == DBM_INSERT) ? R_NOOVERWRITE : 0)));
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}
extern int
dbm_error(db)
DBM *db;
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{
HTAB *hp;
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hp = (HTAB *)db->internal;
return (hp->err);
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}
extern int
dbm_clearerr(db)
DBM *db;
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{
HTAB *hp;
hp = (HTAB *)db->internal;
hp->err = 0;
return (0);
}
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extern int
dbm_dirfno(db)
DBM *db;
{
return(((HTAB *)db->internal)->fp);
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}