hsearch.c

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/*-
 * 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.
 */
 
#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)hsearch.c   8.4 (Berkeley) 7/21/94";
#endif /* LIBC_SCCS and not lint */
 
#include <sys/types.h>
 
#include <fcntl.h>
#include <string.h>
 
#include "../include/db.h"
#include "search.h"
 
static DB *dbp = NULL;
static ENTRY retval;
 
extern int
hcreate(nel)
    u_int nel;
{
    HASHINFO info;
 
    info.nelem = nel;
    info.bsize = 256;
    info.ffactor = 8;
    info.cachesize = 0;
    info.hash = NULL;
    info.lorder = 0;
    dbp = (DB *)__hash_open(NULL, O_CREAT | O_RDWR, 0600, &info, 0);
    return ((int)dbp);
}
 
extern ENTRY *
hsearch(item, action)
    ENTRY item;
    ACTION action;
{
    DBT key, val;
    int status;
 
    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;
    }
}