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

#if defined(LIBC_SCCS) && !defined(lint)
static char sccsid[] = "@(#)hsearch.c   5.5 (Berkeley) %G%";
#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;
}