SRCS=	mv.c obliterate.c

.PATH:	${.CURDIR}/../rm

.It Fl P

When moving regular files across a filesystem boundary, overwrite

the source files before deleting them.

Files are overwritten three times, first with the byte pattern

0xff, then 0x00, and then 0xff again, before they are deleted.

int	obliterate __P((char *, struct stat *));

		case 'P':

			Pflg = 1;

			break;

	if (Pflg && obliterate(from, sbp) == -1)

		return 1;

/*-

 * Copyright (c) 1990, 1993, 1994

 *	The Regents of the University of California.  All rights reserved.

 *

 * 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.

 */

#ifndef lint

static const char copyright[] =

"@(#) Copyright (c) 1990, 1993, 1994\n\

	The Regents of the University of California.  All rights reserved.\n";

#endif /* not lint */

#ifndef lint

#if 0

static char sccsid[] = "@(#)rm.c	8.5 (Berkeley) 4/18/94";

#else

static const char rcsid[] =

  "$FreeBSD: src/bin/rm/rm.c,v 1.30 2000/05/01 18:34:36 asmodai Exp $";

#endif

#endif /* not lint */

#include <sys/param.h>

#include <sys/mount.h>

#include <sys/stat.h>

#include <err.h>

#include <fcntl.h>

#include <stdlib.h>

#include <unistd.h>

/*

 * obliterate --

 *	Overwrite the file 3 times with varying bit patterns.

 *

 * XXX

 * This is a cheap way to *really* delete files.  Note that only regular

 * files are deleted, directories (and therefore names) will remain.

 * Also, this assumes a fixed-block file system (like FFS, or a V7 or a

 * System V file system).  In a logging file system, you'll have to have

 * kernel support.

 */

int

obliterate(file, sbp)

	char *file;

	struct stat *sbp;

{

	struct stat sb;

	struct statfs fsb;

	off_t len;

	int bsize, fd, wlen;

	char *buf = NULL;

	fd = -1;

	if (sbp == NULL) {

		if (lstat(file, &sb))

			goto err;

		sbp = &sb;

	}

	if (!S_ISREG(sbp->st_mode))

		return 0;

	if ((fd = open(file, O_WRONLY, 0)) == -1)

		goto err;

	if (fstatfs(fd, &fsb) == -1)

		goto err;

	bsize = MAX(fsb.f_iosize, 1024);

	if ((buf = malloc(bsize)) == NULL)

		err(1, "malloc");

#define	PASS(byte) {							\

	memset(buf, byte, bsize);					\

	for (len = sbp->st_size; len > 0; len -= wlen) {		\

		wlen = len < bsize ? len : bsize;			\

		if (write(fd, buf, wlen) != wlen)			\

			goto err;					\

	}								\

}

	PASS(0xff);

	if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))

		goto err;

	PASS(0x00);

	if (fsync(fd) || lseek(fd, (off_t)0, SEEK_SET))

		goto err;

	PASS(0xff);

	if (!fsync(fd) && !close(fd)) {

		free(buf);

		return 0;

	}

err:	if (buf)

		free(buf);

	warn("%s", file);

	return -1;

}

int	obliterate __P((char *, struct stat *));