xref: /titanic_41/usr/src/cmd/sendmail/db/hsearch/hsearch.c (revision 7c478bd95313f5f23a4c958a745db2134aa03244)

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1996, 1997, 1998
 *	Sleepycat Software.  All rights reserved.
 */
/*
 * Copyright (c) 1990, 1993
 *	Margo Seltzer.  All rights reserved.
 */
/*
 * 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.
 */

#include "config.h"

#ifndef lint
static const char sccsid[] = "@(#)hsearch.c	10.9 (Sleepycat) 4/18/98";
#endif /* not lint */

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>

#include <errno.h>
#include <string.h>
#endif

#define	DB_DBM_HSEARCH	1
#include "db_int.h"

static DB	*dbp;
static ENTRY	 retval;

int
__db_hcreate(nel)
	size_t nel;
{
	DB_INFO dbinfo;

	memset(&dbinfo, 0, sizeof(dbinfo));
	dbinfo.db_pagesize = 512;
	dbinfo.h_ffactor = 16;
	dbinfo.h_nelem = (u_int32_t)nel;	/* XXX: Possible overflow. */

	errno = db_open(NULL,
	    DB_HASH, DB_CREATE, __db_omode("rw----"), NULL, &dbinfo, &dbp);
	return (errno == 0 ? 1 : 0);
}

ENTRY *
__db_hsearch(item, action)
	ENTRY item;
	ACTION action;
{
	DBT key, val;

	if (dbp == NULL) {
		errno = EINVAL;
		return (NULL);
	}
	memset(&key, 0, sizeof(key));
	memset(&val, 0, sizeof(val));
	key.data = item.key;
	key.size = strlen(item.key) + 1;

	switch (action) {
	case ENTER:
		val.data = item.data;
		val.size = strlen(item.data) + 1;

		/*
		 * Try and add the key to the database.  If we fail because
		 * the key already exists, return the existing key.
		 */
		if ((errno =
		    dbp->put(dbp, NULL, &key, &val, DB_NOOVERWRITE)) == 0)
			break;
		if (errno != DB_KEYEXIST)
			return (NULL);
		if ((errno = dbp->get(dbp, NULL, &key, &val, 0)) == 0)
			break;

		if (errno == DB_NOTFOUND)	/* XXX: can't happen. */
			errno = EINVAL;
		break;
	case FIND:
		if ((errno = dbp->get(dbp, NULL, &key, &val, 0)) != 0) {
			if (errno == DB_NOTFOUND)
				errno = 0;
			return (NULL);
		}
		item.data = (char *)val.data;
		break;
	default:
		errno = EINVAL;
		return (NULL);
	}
	retval.key = item.key;
	retval.data = item.data;
	return (&retval);
}

void
__db_hdestroy()
{
	if (dbp != NULL) {
		(void)dbp->close(dbp, 0);
		dbp = NULL;
	}
}