NetBSD/usr.bin/tcopy/tcopy.c

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/* $NetBSD: tcopy.c,v 1.17 2011/09/06 18:32:26 joerg Exp $ */
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/*
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* Copyright (c) 1985, 1987, 1993, 1995
* The Regents of the University of California. All rights reserved.
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*
* 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. Neither the name of the University nor the names of its contributors
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* 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.
*/
#include <sys/cdefs.h>
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#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1985, 1987, 1993\
The Regents of the University of California. All rights reserved.");
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#endif /* not lint */
#ifndef lint
#if 0
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static char sccsid[] = "@(#)tcopy.c 8.3 (Berkeley) 1/23/95";
#endif
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__RCSID("$NetBSD: tcopy.c,v 1.17 2011/09/06 18:32:26 joerg Exp $");
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#endif /* not lint */
#include <sys/types.h>
#include <sys/stat.h>
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#include <sys/ioctl.h>
#include <sys/mtio.h>
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#include <err.h>
#include <errno.h>
#include <paths.h>
#include <fcntl.h>
#include <signal.h>
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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
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#include <util.h>
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#define MAXREC (64 * 1024)
#define NOCOUNT (-2)
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static int filen, guesslen, maxblk = MAXREC;
static long lastrec, record;
static off_t size, tsize;
static FILE *msg = stdout;
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static void *getspace(int);
__dead static void intr(int);
__dead static void usage(void);
static void verify(int, int, char *);
static void writeop(int, int);
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int
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main(int argc, char *argv[])
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{
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int ch, needeof, nw, inp, outp;
ssize_t lastnread, nread;
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enum {READ, VERIFY, COPY, COPYVERIFY} op = READ;
sig_t oldsig;
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char *buff;
const char *inf;
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outp = 0;
inf = NULL;
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guesslen = 1;
while ((ch = getopt(argc, argv, "cs:vx")) != -1)
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switch((char)ch) {
case 'c':
op = COPYVERIFY;
break;
case 's':
maxblk = atoi(optarg);
if (maxblk <= 0) {
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warnx("illegal block size");
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usage();
}
guesslen = 0;
break;
case 'v':
op = VERIFY;
break;
case 'x':
msg = stderr;
break;
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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]);
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}
break;
default:
usage();
}
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if ((inp = open(inf, O_RDONLY, 0)) < 0)
err(1, "%s", inf);
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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;
}
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err(1, "read error, file %d, record %ld",
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filen, record);
} else if (nread != lastnread) {
if (lastnread != 0 && lastnread != NOCOUNT) {
if (lastrec == 0 && nread == 0)
fprintf(msg, "%ld records\n", record);
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else if (record - lastrec > 1)
fprintf(msg, "records %ld to %ld\n",
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lastrec, record);
else
fprintf(msg, "record %ld\n", lastrec);
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}
if (nread != 0)
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fprintf(msg, "file %d: block size %ld: ",
filen, (long)nread);
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(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) {
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int error = errno;
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fprintf(stderr,
"write error, file %d, record %ld: ",
filen, record);
if (nw == -1)
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fprintf(stderr,
": %s", strerror(error));
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else
fprintf(stderr,
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"write (%d) != read (%ld)\n",
nw, (long)nread);
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fprintf(stderr, "copy aborted\n");
exit(5);
}
}
size += nread;
record++;
} else {
if (lastnread <= 0 && lastnread != NOCOUNT) {
fprintf(msg, "eot\n");
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break;
}
fprintf(msg,
"file %d: eof after %ld records: %lld bytes\n",
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filen, record, (long long)size);
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needeof = 1;
filen++;
tsize += size;
size = record = lastrec = 0;
lastnread = 0;
}
lastnread = nread;
}
fprintf(msg, "total length: %lld bytes\n", (long long)tsize);
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(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);
}
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static void
verify(int inp, int outp, char *outb)
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{
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int eot, inmaxblk, inn, outmaxblk, outn;
char *inb;
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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;
}
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warn("read error");
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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;
}
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warn("read error");
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break;
}
r2: if (inn != outn) {
fprintf(msg,
"%s: tapes have different block sizes; %d != %d.\n",
"tcopy", inn, outn);
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break;
}
if (!inn) {
if (eot++) {
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fprintf(msg, "%s: tapes are identical.\n",
"tcopy");
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free(inb);
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return;
}
} else {
if (memcmp(inb, outb, inn)) {
fprintf(msg,
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"%s: tapes have different data.\n",
"tcopy");
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break;
}
eot = 0;
}
}
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free(inb);
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exit(1);
}
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static void
intr(int signo)
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{
if (record) {
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if (record - lastrec > 1)
fprintf(msg, "records %ld to %ld\n", lastrec, record);
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else
fprintf(msg, "record %ld\n", lastrec);
}
fprintf(msg, "interrupt at file %d: record %ld\n", filen, record);
fprintf(msg, "total length: %lld bytes\n", (long long)(tsize + size));
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(void)raise_default_signal(signo);
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exit(1);
}
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static void *
getspace(int blk)
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{
void *bp;
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if ((bp = malloc((size_t)blk)) == NULL)
errx(11, "no memory");
return (bp);
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}
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static void
writeop(int fd, int type)
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{
struct mtop op;
op.mt_op = type;
op.mt_count = (daddr_t)1;
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if (ioctl(fd, MTIOCTOP, (char *)&op) < 0)
err(6, "tape op");
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}
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static void
usage(void)
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{
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fprintf(stderr, "usage: tcopy [-cvx] [-s maxblk] src [dest]\n");
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exit(1);
}