tcopy.c revision 201612 
1/*
2 * Copyright (c) 1985, 1987, 1993
3 *	The Regents of the University of California.  All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 *    notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 *    notice, this list of conditions and the following disclaimer in the
12 *    documentation and/or other materials provided with the distribution.
13 * 3. All advertising materials mentioning features or use of this software
14 *    must display the following acknowledgement:
15 *	This product includes software developed by the University of
16 *	California, Berkeley and its contributors.
17 * 4. Neither the name of the University nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include <sys/cdefs.h>
35
36__FBSDID("$FreeBSD: head/usr.bin/tcopy/tcopy.c 201612 2010-01-05 21:09:59Z dwmalone $");
37
38#ifndef lint
39static const char copyright[] =
40"@(#) Copyright (c) 1985, 1987, 1993\n\
41	The Regents of the University of California.  All rights reserved.\n";
42#endif
43
44#ifndef lint
45static const char sccsid[] = "@(#)tcopy.c	8.2 (Berkeley) 4/17/94";
46#endif
47
48#include <sys/types.h>
49#include <sys/stat.h>
50#include <sys/ioctl.h>
51#include <sys/mtio.h>
52
53#include <err.h>
54#include <errno.h>
55#include <fcntl.h>
56#include <paths.h>
57#include <signal.h>
58#include <stdint.h>
59#include <stdio.h>
60#include <stdlib.h>
61#include <string.h>
62#include <unistd.h>
63
64#define	MAXREC	(64 * 1024)
65#define	NOCOUNT	(-2)
66
67int	filen, guesslen, maxblk = MAXREC;
68u_int64_t	lastrec, record, size, tsize;
69FILE	*msg;
70
71void	*getspace(int);
72void	 intr(int);
73static void	 usage(void) __dead2;
74void	 verify(int, int, char *);
75void	 writeop(int, int);
76void	rewind_tape(int);
77
78int
79main(int argc, char *argv[])
80{
81	int lastnread, nread, nw, inp, outp;
82	enum {READ, VERIFY, COPY, COPYVERIFY} op = READ;
83	sig_t oldsig;
84	int ch, needeof;
85	char *buff;
86	const char *inf;
87
88	msg = stdout;
89	guesslen = 1;
90	while ((ch = getopt(argc, argv, "cs:vx")) != -1)
91		switch((char)ch) {
92		case 'c':
93			op = COPYVERIFY;
94			break;
95		case 's':
96			maxblk = atoi(optarg);
97			if (maxblk <= 0) {
98				warnx("illegal block size");
99				usage();
100			}
101			guesslen = 0;
102			break;
103		case 'v':
104			op = VERIFY;
105			break;
106		case 'x':
107			msg = stderr;
108			break;
109		case '?':
110		default:
111			usage();
112		}
113	argc -= optind;
114	argv += optind;
115
116	switch(argc) {
117	case 0:
118		if (op != READ)
119			usage();
120		inf = _PATH_DEFTAPE;
121		break;
122	case 1:
123		if (op != READ)
124			usage();
125		inf = argv[0];
126		break;
127	case 2:
128		if (op == READ)
129			op = COPY;
130		inf = argv[0];
131		if ((outp = open(argv[1], op == VERIFY ? O_RDONLY :
132		    op == COPY ? O_WRONLY : O_RDWR, DEFFILEMODE)) < 0)
133			err(3, "%s", argv[1]);
134		break;
135	default:
136		usage();
137	}
138
139	if ((inp = open(inf, O_RDONLY, 0)) < 0)
140		err(1, "%s", inf);
141
142	buff = getspace(maxblk);
143
144	if (op == VERIFY) {
145		verify(inp, outp, buff);
146		exit(0);
147	}
148
149	if ((oldsig = signal(SIGINT, SIG_IGN)) != SIG_IGN)
150		(void) signal(SIGINT, intr);
151
152	needeof = 0;
153	for (lastnread = NOCOUNT;;) {
154		if ((nread = read(inp, buff, maxblk)) == -1) {
155			while (errno == EINVAL && (maxblk -= 1024)) {
156				nread = read(inp, buff, maxblk);
157				if (nread >= 0)
158					goto r1;
159			}
160			err(1, "read error, file %d, record %qu", filen, record);
161		} else if (nread != lastnread) {
162			if (lastnread != 0 && lastnread != NOCOUNT) {
163				if (lastrec == 0 && nread == 0)
164					fprintf(msg, "%qu records\n", record);
165				else if (record - lastrec > 1)
166					fprintf(msg, "records %qu to %qu\n",
167					    lastrec, record);
168				else
169					fprintf(msg, "record %qu\n", lastrec);
170			}
171			if (nread != 0)
172				fprintf(msg, "file %d: block size %d: ",
173				    filen, nread);
174			(void) fflush(stdout);
175			lastrec = record;
176		}
177r1:		guesslen = 0;
178		if (nread > 0) {
179			if (op == COPY || op == COPYVERIFY) {
180				if (needeof) {
181					writeop(outp, MTWEOF);
182					needeof = 0;
183				}
184				nw = write(outp, buff, nread);
185				if (nw != nread) {
186					if (nw == -1) {
187					warn("write error, file %d, record %qu", filen, record);
188					} else {
189					warnx("write error, file %d, record %qu", filen, record);
190					warnx("write (%d) != read (%d)", nw, nread);
191					}
192					errx(5, "copy aborted");
193				}
194			}
195			size += nread;
196			record++;
197		} else {
198			if (lastnread <= 0 && lastnread != NOCOUNT) {
199				fprintf(msg, "eot\n");
200				break;
201			}
202			fprintf(msg,
203			    "file %d: eof after %qu records: %qu bytes\n",
204			    filen, record, size);
205			needeof = 1;
206			filen++;
207			tsize += size;
208			size = record = lastrec = 0;
209			lastnread = 0;
210		}
211		lastnread = nread;
212	}
213	fprintf(msg, "total length: %qu bytes\n", tsize);
214	(void)signal(SIGINT, oldsig);
215	if (op == COPY || op == COPYVERIFY) {
216		writeop(outp, MTWEOF);
217		writeop(outp, MTWEOF);
218		if (op == COPYVERIFY) {
219			rewind_tape(outp);
220			rewind_tape(inp);
221			verify(inp, outp, buff);
222		}
223	}
224	exit(0);
225}
226
227void
228verify(int inp, int outp, char *outb)
229{
230	int eot, inmaxblk, inn, outmaxblk, outn;
231	char *inb;
232
233	inb = getspace(maxblk);
234	inmaxblk = outmaxblk = maxblk;
235	for (eot = 0;; guesslen = 0) {
236		if ((inn = read(inp, inb, inmaxblk)) == -1) {
237			if (guesslen)
238				while (errno == EINVAL && (inmaxblk -= 1024)) {
239					inn = read(inp, inb, inmaxblk);
240					if (inn >= 0)
241						goto r1;
242				}
243			warn("read error");
244			break;
245		}
246r1:		if ((outn = read(outp, outb, outmaxblk)) == -1) {
247			if (guesslen)
248				while (errno == EINVAL && (outmaxblk -= 1024)) {
249					outn = read(outp, outb, outmaxblk);
250					if (outn >= 0)
251						goto r2;
252				}
253			warn("read error");
254			break;
255		}
256r2:		if (inn != outn) {
257			fprintf(msg,
258			    "%s: tapes have different block sizes; %d != %d.\n",
259			    "tcopy", inn, outn);
260			break;
261		}
262		if (!inn) {
263			if (eot++) {
264				fprintf(msg, "tcopy: tapes are identical.\n");
265				return;
266			}
267		} else {
268			if (bcmp(inb, outb, inn)) {
269				fprintf(msg,
270				    "tcopy: tapes have different data.\n");
271				break;
272			}
273			eot = 0;
274		}
275	}
276	exit(1);
277}
278
279void
280intr(int signo __unused)
281{
282	if (record) {
283		if (record - lastrec > 1)
284			fprintf(msg, "records %qu to %qu\n", lastrec, record);
285		else
286			fprintf(msg, "record %qu\n", lastrec);
287	}
288	fprintf(msg, "interrupt at file %d: record %qu\n", filen, record);
289	fprintf(msg, "total length: %ju bytes\n", (uintmax_t)(tsize + size));
290	exit(1);
291}
292
293void *
294getspace(int blk)
295{
296	void *bp;
297
298	if ((bp = malloc((size_t)blk)) == NULL)
299		errx(11, "no memory");
300	return (bp);
301}
302
303void
304writeop(int fd, int type)
305{
306	struct mtop op;
307
308	op.mt_op = type;
309	op.mt_count = (daddr_t)1;
310	if (ioctl(fd, MTIOCTOP, (char *)&op) < 0)
311		err(6, "tape op");
312}
313
314static void
315usage(void)
316{
317	fprintf(stderr, "usage: tcopy [-cvx] [-s maxblk] [src [dest]]\n");
318	exit(1);
319}
320
321void
322rewind_tape(int fd)
323{
324	struct stat sp;
325
326	if(fstat(fd, &sp))
327		errx(12, "fstat in rewind");
328
329	/*
330	 * don't want to do tape ioctl on regular files:
331	 */
332	if( S_ISREG(sp.st_mode) ) {
333		if( lseek(fd, 0, SEEK_SET) == -1 )
334			errx(13, "lseek");
335	} else
336		/*  assume its a tape	*/
337		writeop(fd, MTREW);
338}
339