usr/src/lib/libc/db/hash/ndbm.c

/*-
 * Copyright (c) 1990 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      5.7 (Berkeley) 6/17/91";
#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 <ndbm.h>
#include <db.h>
#include <stdio.h>
#include "hash.h"

/*
    return      *DBM on success
                NULL on failure
*/
extern DBM *
dbm_open( file, flags, mode )
const char      *file;
int     flags;
int     mode;
{
    HASHINFO    info;
    char path[MAXPATHLEN];

    info.bsize = 1024;
    info.ffactor = 5;
    info.nelem = 1;
    info.cachesize = NULL;
    info.hash = NULL;
    info.lorder = 0;
    (void)strcpy(path, file);
    (void)strcat(path, DBM_SUFFIX);
    return( hash_open ( path, flags, mode, &info ) );
}

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;
{
    int status;
    datum       retval;

    status = (db->get) ( db, (DBT *)&key, (DBT *)&retval, 0 );
    if ( status ) {
        retval.dptr = NULL;
        retval.dsize = 0;
    }
    return(retval);
}

/*
    Returns     DATUM on success
                NULL on failure
*/
extern datum
dbm_firstkey(db)
DBM     *db;
{
    int status;
    datum       retkey;
    datum       retdata;

    status = (db->seq) ( db, (DBT *)&retkey, (DBT *)&retdata, R_FIRST );
    if ( status ) {
        retkey.dptr = NULL;
    }
    return(retkey);
}
/*
    Returns     DATUM on success
                NULL on failure
*/
extern datum
dbm_nextkey(db)
DBM     *db;
{
    int status;
    datum       retkey;
    datum       retdata;

    status = (db->seq) ( db, (DBT *)&retkey, (DBT *)&retdata, R_NEXT );
    if ( status ) {
        retkey.dptr = NULL;
    }
    return(retkey);
}

/*
    0 on success
    <0 failure
*/
extern int
dbm_delete(db, key)
DBM     *db;
datum   key;
{
    int status;

    status = (db->del)( db, (DBT *)&key, 0 );
    if ( status ) {
        return(-1);
    } else {
        return(0);
    }
}

/*
    0 on success
    <0 failure
    1 if DBM_INSERT and entry exists
*/
extern int
dbm_store(db, key, content, flags)
DBM     *db;
datum   key;
datum   content;
int     flags;
{
    return ((db->put)( db, (DBT *)&key, (DBT *)&content,
                        (flags == DBM_INSERT) ? R_NOOVERWRITE : 0 ));
}

extern int
dbm_error(db)
DBM     *db;
{
    HTAB        *hp;

    hp = (HTAB *)db->internal;
    return ( hp->errno );
}

extern int
dbm_clearerr(db)
DBM     *db;
{
    HTAB        *hp;

    hp = (HTAB *)db->internal;
    hp->errno = 0;
    return ( 0 );
}