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.
 *
 * %sccs.include.redist.c%
 */

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)ndbm.c      5.3 (Berkeley) %G%";
#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 <stddef.h>
#include "hash.h"

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

    info.bsize = 1024;
    info.ffactor = 5;
    info.nelem = 1;
    info.ncached = NULL;
    info.hash = NULL;
    info.lorder = 0;
    (void)sprintf(path, "%s%s", file, 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 );
    if ( status ) {
        retval.dptr = NULL;
    }
    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->delete)( db, (DBT *)&key );
    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 );
}