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warnx?/errx? paranoia (use "%s" not a bare string unless it is a
constant).  These are not security holes but it is worth fixing
them anyway both for robustness and so folks looking for examples
in the tree are not misled into doing something potentially dangerous.
Furthermore, it is a bad idea to assume that pathnames will not
include '%' in them and that error routines don't return strings
with '%' in them (especially in light of the possibility of locales).

/*	$OpenBSD: tcopy.c,v 1.5 2000/06/30 16:00:22 millert Exp $	*/
/*	$NetBSD: tcopy.c,v 1.5 1997/04/15 07:23:08 lukem Exp $	*/

/*
 * Copyright (c) 1985, 1987, 1993, 1995
 *	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 char copyright[] =
"@(#) Copyright (c) 1985, 1987, 1993\n\
	The Regents of the University of California.  All rights reserved.\n";
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)tcopy.c	8.3 (Berkeley) 1/23/95";
#endif
static char rcsid[] = "$OpenBSD: tcopy.c,v 1.5 2000/06/30 16:00:22 millert Exp $";
#endif /* not lint */

#include <sys/types.h>
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/mtio.h>

#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <paths.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#define	MAXREC	(64 * 1024)
#define	NOCOUNT	(-2)

int	filen, guesslen, maxblk = MAXREC;
long	lastrec, record;
off_t	size, tsize;
FILE	*msg = stdout;

void	*getspace __P((int));
void	 intr __P((int));
void	 usage __P((void));
void	 verify __P((int, int, char *));
void	 writeop __P((int, int));

int
main(argc, argv)
	int argc;
	char *argv[];
{
	int ch, needeof, nw, inp, outp;
	ssize_t lastnread, nread;
	enum {READ, VERIFY, COPY, COPYVERIFY} op = READ;
	sig_t oldsig;
	char *buff, *inf;

	guesslen = 1;
	while ((ch = getopt(argc, argv, "cs:vx")) != -1)
		switch((char)ch) {
		case 'c':
			op = COPYVERIFY;
			break;
		case 's':
			maxblk = atoi(optarg);
			if (maxblk <= 0) {
				warnx("illegal block size");
				usage();
			}
			guesslen = 0;
			break;
		case 'v':
			op = VERIFY;
			break;
		case 'x':
			msg = stderr;
			break;
		case '?':
		default:
			usage();
		}
	argc -= optind;
	argv += optind;

	switch(argc) {
	case 0:
		if (op != READ)
			usage();
		inf = _PATH_DEFTAPE;
		break;
	case 1:
		if (op != READ)
			usage();
		inf = argv[0];
		break;
	case 2:
		if (op == READ)
			op = COPY;
		inf = argv[0];
		if ((outp = open(argv[1], op == VERIFY ? O_RDONLY :
		    op == COPY ? O_WRONLY : O_RDWR, DEFFILEMODE)) < 0) {
			err(3, "%s", argv[1]);
		}
		break;
	default:
		usage();
	}

	if ((inp = open(inf, O_RDONLY, 0)) < 0)
		err(1, "%s", inf);

	buff = getspace(maxblk);

	if (op == VERIFY) {
		verify(inp, outp, buff);
		exit(0);
	}

	if ((oldsig = signal(SIGINT, SIG_IGN)) != SIG_IGN)
		(void) signal(SIGINT, intr);

	needeof = 0;
	for (lastnread = NOCOUNT;;) {
		if ((nread = read(inp, buff, maxblk)) == -1) {
			while (errno == EINVAL && (maxblk -= 1024)) {
				nread = read(inp, buff, maxblk);
				if (nread >= 0)
					goto r1;
			}
			err(1, "read error, file %d, record %ld",
			    filen, record);
		} else if (nread != lastnread) {
			if (lastnread != 0 && lastnread != NOCOUNT) {
				if (lastrec == 0 && nread == 0)
					fprintf(msg, "%ld records\n", record);
				else if (record - lastrec > 1)
					fprintf(msg, "records %ld to %ld\n",
					    lastrec, record);
				else
					fprintf(msg, "record %ld\n", lastrec);
			}
			if (nread != 0)
				fprintf(msg, "file %d: block size %d: ",
				    filen, nread);
			(void) fflush(stdout);
			lastrec = record;
		}
r1:		guesslen = 0;
		if (nread > 0) {
			if (op == COPY || op == COPYVERIFY) {
				if (needeof) {
					writeop(outp, MTWEOF);
					needeof = 0;
				}
				nw = write(outp, buff, nread);
				if (nw != nread) {
				    int error = errno;
				    fprintf(stderr,
					"write error, file %d, record %ld: ",
					filen, record);
				    if (nw == -1)
					fprintf(stderr,
						": %s", strerror(error));
				    else
					fprintf(stderr,
					    "write (%d) != read (%d)\n",
					    nw, nread);
				    fprintf(stderr, "copy aborted\n");
				    exit(5);
				}
			}
			size += nread;
			record++;
		} else {
			if (lastnread <= 0 && lastnread != NOCOUNT) {
				fprintf(msg, "eot\n");
				break;
			}
			fprintf(msg,
			    "file %d: eof after %ld records: %qd bytes\n",
			    filen, record, size);
			needeof = 1;
			filen++;
			tsize += size;
			size = record = lastrec = 0;
			lastnread = 0;
		}
		lastnread = nread;
	}
	fprintf(msg, "total length: %qd bytes\n", tsize);
	(void)signal(SIGINT, oldsig);
	if (op == COPY || op == COPYVERIFY) {
		writeop(outp, MTWEOF);
		writeop(outp, MTWEOF);
		if (op == COPYVERIFY) {
			writeop(outp, MTREW);
			writeop(inp, MTREW);
			verify(inp, outp, buff);
		}
	}
	exit(0);
}

void
verify(inp, outp, outb)
	int inp, outp;
	char *outb;
{
	int eot, inmaxblk, inn, outmaxblk, outn;
	char *inb;

	inb = getspace(maxblk);
	inmaxblk = outmaxblk = maxblk;
	for (eot = 0;; guesslen = 0) {
		if ((inn = read(inp, inb, inmaxblk)) == -1) {
			if (guesslen)
				while (errno == EINVAL && (inmaxblk -= 1024)) {
					inn = read(inp, inb, inmaxblk);
					if (inn >= 0)
						goto r1;
				}
			warn("read error");
			break;
		}
r1:		if ((outn = read(outp, outb, outmaxblk)) == -1) {
			if (guesslen)
				while (errno == EINVAL && (outmaxblk -= 1024)) {
					outn = read(outp, outb, outmaxblk);
					if (outn >= 0)
						goto r2;
				}
			warn("read error");
			break;
		}
r2:		if (inn != outn) {
			fprintf(msg,
			    "%s: tapes have different block sizes; %d != %d.\n",
			    "tcopy", inn, outn);
			break;
		}
		if (!inn) {
			if (eot++) {
				fprintf(msg, "%s: tapes are identical.\n",
					"tcopy");
				return;
			}
		} else {
			if (bcmp(inb, outb, inn)) {
				fprintf(msg,
				    "%s: tapes have different data.\n",
					"tcopy");
				break;
			}
			eot = 0;
		}
	}
	exit(1);
}

void
intr(signo)
	int signo;
{
	if (record)
		if (record - lastrec > 1)
			fprintf(msg, "records %ld to %ld\n", lastrec, record);
		else
			fprintf(msg, "record %ld\n", lastrec);
	fprintf(msg, "interrupt at file %d: record %ld\n", filen, record);
	fprintf(msg, "total length: %qd bytes\n", tsize + size);
	exit(1);
}

void *
getspace(blk)
	int blk;
{
	void *bp;

	if ((bp = malloc((size_t)blk)) == NULL)
		errx(11, "no memory");

	return (bp);
}

void
writeop(fd, type)
	int fd, type;
{
	struct mtop op;

	op.mt_op = type;
	op.mt_count = (daddr_t)1;
	if (ioctl(fd, MTIOCTOP, (char *)&op) < 0)
		err(6, "tape op");
}

void
usage()
{

	fprintf(stderr, "usage: tcopy [-cvx] [-s maxblk] src [dest]\n");
	exit(1);
}