Net2/usr/src/lib/libc/db/hash/hsearch.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[] = "@(#)hsearch.c	5.5 (Berkeley) 3/12/91";
#endif /* LIBC_SCCS and not lint */

#include <sys/types.h>
#include <fcntl.h>
#include <string.h>
#include <db.h>
#include "search.h"

static	DB	*dbp = NULL;
static	ENTRY	retval;

extern	int
hcreate ( nel )
unsigned	nel;
{
    int	status;
    HASHINFO	info;

    info.nelem = nel;
    info.bsize = 256;
    info.ffactor = 8;
    info.cachesize = NULL;
    info.hash = NULL;
    info.lorder = 0;
    dbp = hash_open ( NULL, O_CREAT|O_RDWR, 0600, &info );
    return ( (int) dbp );
}


extern ENTRY	*
hsearch ( item, action )
ENTRY	item;
ACTION	action;
{
    int	status;
    DBT	key, val;

    if ( !dbp ) {
	return(NULL);
    }

    key.data = (u_char *)item.key;
    key.size = strlen(item.key) + 1;

    if ( action == ENTER ) {
	val.data = (u_char *)item.data;
	val.size = strlen(item.data) + 1;
	status = (dbp->put) ( dbp, &key, &val, R_NOOVERWRITE );
	if ( status ) {
	    return(NULL);
	} 
    } else {
	/* FIND */
	status = (dbp->get) ( dbp, &key, &val, 0 );
	if ( status ) {
	    return ( NULL );
	} else {
	    item.data = (char *)val.data;
	}
    }
    retval.key = item.key;
    retval.data = item.data;
    return ( &retval );
}


extern void
hdestroy ()
{
    if (dbp) {
	(void)(dbp->close) (dbp);
	dbp = NULL;
    }
    return;
}