#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 <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "pathnames.h"
#define MAXREC (64 * 1024)
#define NOCOUNT (-2)
static int filen, guesslen, maxblk = MAXREC;
static u_int64_t lastrec, record, size, tsize;
static FILE *msg;
static void *getspace(int);
static void intr(int) __dead2;
static void usage(void) __dead2;
static void verify(int, int, char *);
static void writeop(int, int);
static void rewind_tape(int);
int
main(int argc, char **argv)
{
int lastnread, nread, nw, inp, outp;
enum {READ, VERIFY, COPY, COPYVERIFY} op = READ;
sig_t oldsig;
int ch, needeof;
char *buff, *inf;
msg = stdout;
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 %ju", filen,
(uintmax_t)record);
} else if (nread != lastnread) {
if (lastnread != 0 && lastnread != NOCOUNT) {
if (lastrec == 0 && nread == 0)
fprintf(msg, "%ju records\n",
(uintmax_t)record);
else if (record - lastrec > 1)
fprintf(msg, "records %ju to %ju\n",
(uintmax_t)lastrec,
(uintmax_t)record);
else
fprintf(msg, "record %ju\n",
(uintmax_t)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) {
if (nw == -1) {
warn("write error, file %d, record %ju",
filen, (uintmax_t)record);
} else {
warnx("write error, file %d, record %ju",
filen, (uintmax_t)record);
warnx("write (%d) != read (%d)", nw, nread);
}
errx(5, "copy aborted");
}
}
size += nread;
record++;
} else {
if (lastnread <= 0 && lastnread != NOCOUNT) {
fprintf(msg, "eot\n");
break;
}
fprintf(msg,
"file %d: eof after %ju records: %ju bytes\n",
filen, (uintmax_t)record, (uintmax_t)size);
needeof = 1;
filen++;
tsize += size;
size = record = lastrec = 0;
lastnread = 0;
}
lastnread = nread;
}
fprintf(msg, "total length: %ju bytes\n", (uintmax_t)tsize);
(void)signal(SIGINT, oldsig);
if (op == COPY || op == COPYVERIFY) {
writeop(outp, MTWEOF);
writeop(outp, MTWEOF);
if (op == COPYVERIFY) {
rewind_tape(outp);
rewind_tape(inp);
verify(inp, outp, buff);
}
}
exit(0);
}
static void
verify(int inp, int 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, "tcopy: tapes are identical.\n");
return;
}
} else {
if (bcmp(inb, outb, inn)) {
fprintf(msg,
"tcopy: tapes have different data.\n");
break;
}
eot = 0;
}
}
exit(1);
}
static void
intr(int signo)
{
if (record) {
if (record - lastrec > 1)
fprintf(msg, "records %ju to %ju\n",
(uintmax_t)lastrec, (uintmax_t)record);
else
fprintf(msg, "record %ju\n", (uintmax_t)lastrec);
}
fprintf(msg, "interrupt at file %d: record %ju\n", filen,
(uintmax_t)record);
fprintf(msg, "total length: %ju bytes\n", (uintmax_t)tsize + size);
exit(1);
}
static void *
getspace(int blk)
{
void *bp;
if ((bp = malloc((size_t)blk)) == NULL)
errx(11, "no memory");
return (bp);
}
static void
writeop(int fd, int 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");
}
static void
usage(void)
{
fprintf(stderr, "usage: tcopy [-cvx] [-s maxblk] [src [dest]]\n");
exit(1);
}
static void
rewind_tape(int fd)
{
struct stat sp;
if(fstat(fd, &sp))
errx(12, "fstat in rewind");
if( S_ISREG(sp.st_mode) ) {
if( lseek(fd, 0, SEEK_SET) == -1 )
errx(13, "lseek");
} else
writeop(fd, MTREW);
}
