/*      $NetBSD: tcopy.c,v 1.17 2011/09/06 18:32:26 joerg 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. 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.
 */

#include <sys/cdefs.h>
#ifndef lint
__COPYRIGHT("@(#) Copyright (c) 1985, 1987, 1993\
 The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)tcopy.c     8.3 (Berkeley) 1/23/95";
#endif
__RCSID("$NetBSD: tcopy.c,v 1.17 2011/09/06 18:32:26 joerg 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 <paths.h>
#include <fcntl.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <util.h>

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

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

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);

int
main(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;
        const char *inf;

        outp = 0;
        inf = NULL;
        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 %ld: ",
                                    filen, (long)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 (%ld)\n",
                                            nw, (long)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: %lld bytes\n",
                            filen, record, (long long)size);
                        needeof = 1;
                        filen++;
                        tsize += size;
                        size = record = lastrec = 0;
                        lastnread = 0;
                }
                lastnread = nread;
        }
        fprintf(msg, "total length: %lld bytes\n", (long long)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);
}

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, "%s: tapes are identical.\n",
                                        "tcopy");
                                free(inb);
                                return;
                        }
                } else {
                        if (memcmp(inb, outb, inn)) {
                                fprintf(msg,
                                    "%s: tapes have different data.\n",
                                        "tcopy");
                                break;
                        }
                        eot = 0;
                }
        }
        free(inb);
        exit(1);
}

static void
intr(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: %lld bytes\n", (long long)(tsize + size));
        (void)raise_default_signal(signo);
        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);
}