freebsd-skq/lib/libc/db/hash/ndbm.c
Daniel O'Callaghan d53ec6c0d0 Reviewed by: Bruce Evans <bde@freebsd.org>
Guard against possible buffer overrun in filename passed.
Another candidate for 2.2.
1997-02-15 07:10:26 +00:00

230 lines
4.8 KiB
C

/*-
* Copyright (c) 1990, 1993
* The Regents of the University of California. All rights reserved.
*
* 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.
*/
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)ndbm.c 8.4 (Berkeley) 7/21/94";
#endif /* LIBC_SCCS and not lint */
/*
* This package provides a dbm compatible interface to the new hashing
* package described in db(3).
*/
#include <sys/param.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <ndbm.h>
#include "hash.h"
/*
* Returns:
* *DBM on success
* NULL on failure
*/
extern DBM *
dbm_open(file, flags, mode)
const char *file;
int flags, mode;
{
HASHINFO info;
char path[MAXPATHLEN];
info.bsize = 4096;
info.ffactor = 40;
info.nelem = 1;
info.cachesize = 0;
info.hash = NULL;
info.lorder = 0;
if( strlen(file) >= sizeof(path) - strlen(DBM_SUFFIX)) {
errno = ENAMETOOLONG;
return(NULL);
}
(void)strcpy(path, file);
(void)strcat(path, DBM_SUFFIX);
return ((DBM *)__hash_open(path, flags, mode, &info, 0));
}
extern void
dbm_close(db)
DBM *db;
{
(void)(db->close)(db);
}
/*
* Returns:
* DATUM on success
* NULL on failure
*/
extern datum
dbm_fetch(db, key)
DBM *db;
datum key;
{
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);
}
/*
* Returns:
* DATUM on success
* NULL on failure
*/
extern datum
dbm_firstkey(db)
DBM *db;
{
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);
}
/*
* Returns:
* DATUM on success
* NULL on failure
*/
extern datum
dbm_nextkey(db)
DBM *db;
{
int status;
datum retkey;
DBT dbtretkey, dbtretdata;
status = (db->seq)(db, &dbtretkey, &dbtretdata, R_NEXT);
if (status)
dbtretkey.data = NULL;
retkey.dptr = dbtretkey.data;
retkey.dsize = dbtretkey.size;
return (retkey);
}
/*
* Returns:
* 0 on success
* <0 failure
*/
extern int
dbm_delete(db, key)
DBM *db;
datum key;
{
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);
}
/*
* 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;
{
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,
(flags == DBM_INSERT) ? R_NOOVERWRITE : 0));
}
extern int
dbm_error(db)
DBM *db;
{
HTAB *hp;
hp = (HTAB *)db->internal;
return (hp->error);
}
extern int
dbm_clearerr(db)
DBM *db;
{
HTAB *hp;
hp = (HTAB *)db->internal;
hp->error = 0;
return (0);
}
extern int
dbm_dirfno(db)
DBM *db;
{
return(((HTAB *)db->internal)->fp);
}