xref: /csrg-svn/lib/libc/db/hash/ndbm.c (revision 64481)

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

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)ndbm.c	8.2 (Berkeley) 09/11/93";
#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 <stdio.h>
#include <string.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 = NULL;
	info.hash = NULL;
	info.lorder = 0;
	(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 retval;
	int status;

	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 retdata, retkey;

	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 retdata, retkey;

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

/*
 * Returns:
 *	 0 on success
 *	<0 failure
 *	 1 if DBM_INSERT and entry exists
 */
extern int
dbm_store(db, key, content, flags)
	DBM *db;
	datum key, 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);
}

extern int
dbm_dirfno(db)
	DBM *db;
{
	return(((HTAB *)db->internal)->fp);
}