From owner-freebsd-questions  Tue Oct 29  7:41:51 2002
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 5F94637B401
	for <freebsd-questions@freebsd.org>; Tue, 29 Oct 2002 07:41:49 -0800 (PST)
Received: from fserver.bluehighway.net (pcp01060543pcs.polcht01.tn.comcast.net [68.59.253.233])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 7EC5143E6E
	for <freebsd-questions@freebsd.org>; Tue, 29 Oct 2002 07:41:28 -0800 (PST)
	(envelope-from mwade@bluehighwaylabs.com)
Received: from bluehighway.net (bluehighway.net [192.168.1.10])
	by fserver.bluehighway.net (Postfix) with ESMTP id 83DDB5F501
	for <freebsd-questions@freebsd.org>; Tue, 29 Oct 2002 10:42:15 -0500 (EST)
Date: Tue, 29 Oct 2002 10:42:15 -0500 (EST)
From: Mike Wade <mwade@bluehighwaylabs.com>
X-X-Sender:  <mwade@bluehighway.net>
To: <freebsd-questions@freebsd.org>
Subject: FreeBSD db problems
Message-ID: <20021029103610.B19303-100000@bluehighway.net>
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset=US-ASCII
Sender: owner-freebsd-questions@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-questions.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo@FreeBSD.ORG?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo@FreeBSD.ORG?subject=subscribe%20freebsd-questions>
List-Unsubscribe: <mailto:majordomo@FreeBSD.ORG?subject=unsubscribe%20freebsd-questions>
X-Loop: FreeBSD.ORG

Any ideas why this db code chews the data while doing a DB walk with "seq"
and replacing data with "put"?

#include <stdio.h>
#include <stdlib.h>
#include <fcntl.h>
#include <db.h>

int main()
{
	DB *db_p;
	DBT db_key, db_val;
	char buf[16];
	int i, r, flags;

	db_p = dbopen("test.db", O_RDWR|O_CREAT|O_TRUNC, 0644, DB_HASH, NULL);
	if (!db_p)
	{
		printf("fatal: dbopen() failed\n");
		exit(0);
	}

	for (i=0; i<100; i++)
	{
		snprintf(buf, 16, "%d", i);
		db_key.data = &buf;
		db_key.size = strlen(buf);
		db_val.data = NULL;
		db_val.size = 0;

		r = (db_p->put)(db_p, &db_key, &db_val, 0);

		printf("put(%d) %.*s -> ", r, (int)db_key.size, (char *)db_key.data);
		printf("%.*s\n", (int)db_val.size, (char *)db_val.data);
	}

	for (flags = R_FIRST;; flags = R_NEXT)
	{
		r = (db_p->seq)(db_p, &db_key, &db_val, flags);

		printf("seq(%d) %.*s -> ", r, (int)db_key.size, (char *)db_key.data);
		printf("%.*s\n", (int)db_val.size, (char *)db_val.data);

		if (r == -1)
		{
			printf("fatal: error issuing db seq command\n");
			exit(0);
		}
		if (r == 1)
			break;

		db_val.data = "abc";
		db_val.size = 3;

		printf("1 put( ) %.*s -> ", (int)db_key.size, (char *)db_key.data);
		printf("%.*s\n", (int)db_val.size, (char *)db_val.data);

		r = (db_p->put)(db_p, &db_key, &db_val, 0);

		printf("2 put(%d) %.*s -> ", r, (int)db_key.size, (char *)db_key.data);
		printf("%.*s\n", (int)db_val.size, (char *)db_val.data);
	}

	db_p->close(db_p);

	return(0);
}

---
Mike Wade (mwade@bluehighwaylabs.com)


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-questions" in the body of the message