/*      $NetBSD: main.c,v 1.79 2024/10/04 11:38:44 rillig Exp $ */

/*-
 * Copyright (c) 1980, 1991, 1993, 1994
 *      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) 1980, 1991, 1993, 1994\
 The Regents of the University of California.  All rights reserved.");
#endif /* not lint */

#ifndef lint
#if 0
static char sccsid[] = "@(#)main.c      8.6 (Berkeley) 5/1/95";
#else
__RCSID("$NetBSD: main.c,v 1.79 2024/10/04 11:38:44 rillig Exp $");
#endif
#endif /* not lint */

#include <sys/param.h>
#include <sys/time.h>
#include <sys/stat.h>
#include <sys/mount.h>
#include <sys/sysctl.h>

#include <ufs/ffs/fs.h>
#include <ufs/ffs/ffs_extern.h>

#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <fcntl.h>
#include <fstab.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <util.h>

#include "dump.h"
#include "pathnames.h"
#include "snapshot.h"

union u_spcl u_spcl;
struct ufsi *ufsib;
int     mapsize;
char    *usedinomap;
char    *dumpdirmap;
char    *dumpinomap;
char    *disk;
char    *disk_dev;
const char *tape;
const char *dumpdates;
const char *temp;
char    lastlevel;
char    level;
int     uflag;
const char *dumpdev;
int     eflag;
int     lflag;
int     diskfd;
int     tapefd;
int     pipeout;
int     trueinc;
ino_t   curino;
int     newtape;
u_int64_t       tapesize;
long    tsize;
long    asize;
int     etapes;
int     nonodump;
int     unlimited;
time_t  tstart_writing;
time_t  tstart_volume;
int     xferrate;
char    sblock_buf[MAXBSIZE];
int     dev_bshift;
int     tp_bshift;
int needswap;

int     timestamp;              /* print message timestamps */
int     notify;                 /* notify operator flag */
u_int64_t       blockswritten;  /* number of blocks written on current tape */
int     tapeno;                 /* current tape number */
int     density;                /* density in bytes/0.1" */
int     ntrec = NTREC;          /* # tape blocks in each tape record */
int     cartridge;              /* Assume non-cartridge tape */
long    dev_bsize = 1;          /* recalculated below */
long    blocksperfile;          /* output blocks per file */
const char *host;               /* remote host (if any) */
int     readcache = -1;         /* read cache size (in readblksize blks) */
int     readblksize = -1;       /* read block size */
char    default_time_string[] = "%T %Z"; /* default timestamp string */
char    *time_string = default_time_string; /* timestamp string */

static long numarg(const char *, long, long);
static void obsolete(int *, char **[]);
static void usage(void);

int
main(int argc, char *argv[])
{
        ino_t ino;
        int dirty;
        union dinode *dp;
        struct fstab *dt;
        struct statvfs *mntinfo, fsbuf;
        char *map, *cp;
        int ch;
        int i, anydirskipped, bflag = 0, Tflag = 0, Fflag = 0, honorlevel = 1;
        int snap_internal = 0;
        ino_t maxino;
        time_t tnow, date;
        int dirc;
        char *mountpoint;
        int just_estimate = 0;
        char labelstr[LBLSIZE];
        char buf[MAXPATHLEN], rbuf[MAXPATHLEN];
        char *new_time_format;
        char *snap_backup = NULL;

        spcl.c_date = 0;
        (void)time(&tnow);
        spcl.c_date = tnow;
        tzset(); /* set up timezone for strftime */
        if ((new_time_format = getenv("TIMEFORMAT")) != NULL)
                time_string = new_time_format;

        tsize = 0;      /* Default later, based on 'c' option for cart tapes */
        if ((tape = getenv("TAPE")) == NULL)
                tape = _PATH_DEFTAPE;
        dumpdates = _PATH_DUMPDATES;
        temp = _PATH_DTMP;
        strcpy(labelstr, "none");       /* XXX safe strcpy. */
        if (TP_BSIZE / DEV_BSIZE == 0 || TP_BSIZE % DEV_BSIZE != 0)
                quit("TP_BSIZE must be a multiple of DEV_BSIZE");
        level = '0';
        timestamp = 0;

        if (argc < 2)
                usage();

        obsolete(&argc, &argv);
        while ((ch = getopt(argc, argv,
            "0123456789aB:b:cd:D:eFf:h:ik:l:L:nr:s:StT:uU:Wwx:X")) != -1)
                switch (ch) {
                /* dump level */
                case '0': case '1': case '2': case '3': case '4':
                case '5': case '6': case '7': case '8': case '9':
                        level = ch;
                        break;

                case 'a':               /* `auto-size', Write to EOM. */
                        unlimited = 1;
                        break;

                case 'B':               /* blocks per output file */
                        blocksperfile = numarg("blocks per file", 1L, 0L);
                        break;

                case 'b':               /* blocks per tape write */
                        ntrec = numarg("blocks per write", 1L, 1000L);
                        bflag = 1;
                        break;

                case 'c':               /* Tape is cart. not 9-track */
                        cartridge = 1;
                        break;

                case 'd':               /* density, in bits per inch */
                        density = numarg("density", 10L, 327670L) / 10;
                        if (density >= 625 && !bflag)
                                ntrec = HIGHDENSITYTREC;
                        break;

                case 'D':               /* specify alt. dumpdates file */
                        dumpdates = optarg;
                        break;

                case 'e':               /* eject full tapes */
                        eflag = 1;
                        break;

                case 'F':               /* files-to-dump is an fs image */
                        Fflag = 1;
                        break;

                case 'f':               /* output file */
                        tape = optarg;
                        break;

                case 'h':
                        honorlevel = numarg("honor level", 0L, 10L);
                        break;

                case 'i':       /* "true incremental" regardless level */
                        level = 'i';
                        trueinc = 1;
                        break;

                case 'k':
                        readblksize = numarg("read block size", 0, 64) * 1024;
                        break;

                case 'l':               /* autoload after eject full tapes */
                        eflag = 1;
                        lflag = numarg("timeout (in seconds)", 1, 0);
                        break;

                case 'L':
                        /*
                         * Note that although there are LBLSIZE characters,
                         * the last must be '\0', so the limit on strlen()
                         * is really LBLSIZE-1.
                         */
                        if (strlcpy(labelstr, optarg, sizeof(labelstr))
                            >= sizeof(labelstr)) {
                                msg(
                "WARNING Label `%s' is larger than limit of %lu characters.\n",
                                    optarg,
                                    (unsigned long)sizeof(labelstr) - 1);
                                msg("WARNING: Using truncated label `%s'.\n",
                                    labelstr);
                        }
                        break;
                case 'n':               /* notify operators */
                        notify = 1;
                        break;

                case 'r':               /* read cache size */
                        readcache = numarg("read cache size", 0, 512);
                        break;

                case 's':               /* tape size, feet */
                        tsize = numarg("tape size", 1L, 0L) * 12 * 10;
                        break;

                case 'S':               /* exit after estimating # of tapes */
                        just_estimate = 1;
                        break;

                case 't':
                        timestamp = 1;
                        break;

                case 'T':               /* time of last dump */
                        spcl.c_ddate = unctime(optarg);
                        if (spcl.c_ddate < 0) {
                                (void)fprintf(stderr, "bad time \"%s\"\n",
                                    optarg);
                                exit(X_STARTUP);
                        }
                        Tflag = 1;
                        lastlevel = '?';
                        break;

                case 'u':               /* update /etc/dumpdates */
                        uflag = 1;
                        break;

                case 'U':               /* dump device in /etc/dumpdates */
                        dumpdev = optarg;
                        break;

                case 'W':               /* what to do */
                case 'w':
                        lastdump(ch);
                        exit(X_FINOK);  /* do nothing else */

                case 'x':
                        snap_backup = optarg;
                        break;

                case 'X':
                        snap_internal = 1;
                        break;

                default:
                        usage();
                }
        argc -= optind;
        argv += optind;

        if (argc < 1) {
                (void)fprintf(stderr,
                    "Must specify disk or image, or file list\n");
                exit(X_STARTUP);
        }


        /*
         *      determine if disk is a subdirectory, and setup appropriately
         */
        getfstab();             /* /etc/fstab snarfed */
        disk = NULL;
        disk_dev = NULL;
        mountpoint = NULL;
        dirc = 0;
        for (i = 0; i < argc; i++) {
                struct stat sb;
                int error;

                error = lstat(argv[i], &sb);
                if (Fflag || (!error && (S_ISCHR(sb.st_mode) || S_ISBLK(sb.st_mode)))) {
                        if (error)
                                quite(errno, "can't stat %s", argv[i]);
                        disk = argv[i];
 multicheck:
                        if (dirc != 0)
                                quit("can't dump a disk or image at the same"
                                " time as a file list");
                        break;
                }
                if ((dt = fstabsearch(argv[i])) != NULL) {
                        disk = argv[i];
                        mountpoint = xstrdup(dt->fs_file);
                        goto multicheck;
                }
                if (statvfs(argv[i], &fsbuf) == -1)
                        quite(errno, "can't statvfs %s", argv[i]);
                disk = fsbuf.f_mntfromname;
                if (strcmp(argv[i], fsbuf.f_mntonname) == 0)
                        goto multicheck;
                if (mountpoint == NULL) {
                        mountpoint = xstrdup(fsbuf.f_mntonname);
                        if (uflag) {
                                msg("Ignoring u flag for subdir dump\n");
                                uflag = 0;
                        }
                        if (level > '0') {
                                msg("Subdir dump is done at level 0\n");
                                level = '0';
                        }
                        msg("Dumping sub files/directories from %s\n",
                            mountpoint);
                } else {
                        if (strcmp(mountpoint, fsbuf.f_mntonname) != 0)
                                quit("%s is not on %s", argv[i], mountpoint);
                }
                msg("Dumping file/directory %s\n", argv[i]);
                dirc++;
        }
        if (mountpoint)
                free(mountpoint);

        if (dirc == 0) {
                argv++;
                if (argc != 1) {
                        (void)fprintf(stderr, "Excess arguments to dump:");
                        while (--argc)
                                (void)fprintf(stderr, " %s", *argv++);
                        (void)fprintf(stderr, "\n");
                        exit(X_STARTUP);
                }
        }
        if (Tflag && uflag) {
                (void)fprintf(stderr,
                    "You cannot use the T and u flags together.\n");
                exit(X_STARTUP);
        }
        if (strcmp(tape, "-") == 0) {
                pipeout++;
                tape = "standard output";
        }

        if (blocksperfile)
                blocksperfile = blocksperfile / ntrec * ntrec; /* round down */
        else if (!unlimited) {
                /*
                 * Determine how to default tape size and density
                 *
                 *              density                         tape size
                 * 9-track      1600 bpi (160 bytes/.1")        2300 ft.
                 * 9-track      6250 bpi (625 bytes/.1")        2300 ft.
                 * cartridge    8000 bpi (100 bytes/.1")        1700 ft.
                 *                                              (450*4 - slop)
                 */
                if (density == 0)
                        density = cartridge ? 100 : 160;
                if (tsize == 0)
                        tsize = cartridge ? 1700L*120L : 2300L*120L;
        }

        /* LINTED 346 "call to 'strchr' effectively discards 'const'" */
        if ((cp = strchr(tape, ':')) != NULL) {
                host = tape;
                /* This is fine, because all the const strings don't have : */
                *cp++ = '\0';
                tape = cp;
#ifdef RDUMP
                if (rmthost(host) == 0)
                        exit(X_STARTUP);
#else
                (void)fprintf(stderr, "remote dump not enabled\n");
                exit(X_STARTUP);
#endif
        }

        if (signal(SIGHUP, SIG_IGN) != SIG_IGN)
                signal(SIGHUP, sig);
        if (signal(SIGTRAP, SIG_IGN) != SIG_IGN)
                signal(SIGTRAP, sig);
        if (signal(SIGFPE, SIG_IGN) != SIG_IGN)
                signal(SIGFPE, sig);
        if (signal(SIGBUS, SIG_IGN) != SIG_IGN)
                signal(SIGBUS, sig);
#if 0
        if (signal(SIGSEGV, SIG_IGN) != SIG_IGN)
                signal(SIGSEGV, sig);
#endif
        if (signal(SIGTERM, SIG_IGN) != SIG_IGN)
                signal(SIGTERM, sig);
        if (signal(SIGINT, interrupt) == SIG_IGN)
                signal(SIGINT, SIG_IGN);

        /*
         *      disk can be either the full special file name, or
         *      the file system name.
         */
        mountpoint = NULL;
        mntinfo = mntinfosearch(disk);
        if ((dt = fstabsearch(disk)) != NULL) {
                if (getfsspecname(buf, sizeof(buf), dt->fs_spec) == NULL)
                        quite(errno, "can't resolve mount %s (%s)", dt->fs_spec,
                            buf);
                if (getdiskrawname(rbuf, sizeof(rbuf), buf) == NULL)
                        quite(errno, "can't get disk raw name for %s", buf);
                disk = rbuf;
                mountpoint = dt->fs_file;
                msg("Found %s on %s in %s\n", disk, mountpoint, _PATH_FSTAB);
        } else if (mntinfo != NULL) {
                if (getdiskrawname(rbuf, sizeof(rbuf), mntinfo->f_mntfromname)
                    == NULL)
                        quite(errno, "can't get disk raw name for %s",
                            mntinfo->f_mntfromname);
                disk = rbuf;
                mountpoint = mntinfo->f_mntonname;
                msg("Found %s on %s in mount table\n", disk, mountpoint);
        }
        if (mountpoint != NULL) {
                if (dirc != 0)
                        (void)snprintf(spcl.c_filesys, sizeof(spcl.c_filesys),
                            "a subset of %s", mountpoint);
                else
                        (void)strlcpy(spcl.c_filesys, mountpoint,
                            sizeof(spcl.c_filesys));
        } else if (Fflag) {
                (void)strlcpy(spcl.c_filesys, "a file system image",
                    sizeof(spcl.c_filesys));
        } else {
                (void)strlcpy(spcl.c_filesys, "an unlisted file system",
                    sizeof(spcl.c_filesys));
        }
        (void)strlcpy(spcl.c_dev, disk, sizeof(spcl.c_dev));
        (void)strlcpy(spcl.c_label, labelstr, sizeof(spcl.c_label));
        (void)gethostname(spcl.c_host, sizeof(spcl.c_host));
        spcl.c_host[sizeof(spcl.c_host) - 1] = '\0';

        if ((snap_backup != NULL || snap_internal) && mntinfo == NULL) {
                msg("WARNING: Cannot use -x or -X on unmounted file system.\n");
                snap_backup = NULL;
                snap_internal = 0;
        }

#ifdef DUMP_LFS
        sync();
        if (snap_backup != NULL || snap_internal) {
                if (lfs_wrap_stop(mountpoint) < 0) {
                        msg("Cannot stop writing on %s\n", mountpoint);
                        exit(X_STARTUP);
                }
        }
        if ((diskfd = open(disk, O_RDONLY)) < 0) {
                msg("Cannot open %s\n", disk);
                exit(X_STARTUP);
        }
        disk_dev = disk;
#else /* ! DUMP_LFS */
        if (snap_backup != NULL || snap_internal) {
                diskfd = snap_open(mntinfo->f_mntonname, snap_backup,
                    &tnow, &disk_dev);
                if (diskfd < 0) {
                        msg("Cannot open snapshot of %s\n",
                                mntinfo->f_mntonname);
                        exit(X_STARTUP);
                }
                spcl.c_date = tnow;
        } else {
                if ((diskfd = open(disk, O_RDONLY)) < 0) {
                        msg("Cannot open %s\n", disk);
                        exit(X_STARTUP);
                }
                disk_dev = disk;
        }
        sync();
#endif /* ! DUMP_LFS */

        needswap = fs_read_sblock(sblock_buf);

        /* true incremental is always a level 10 dump */
        spcl.c_level = trueinc? iswap32(10): iswap32(level - '0');
        spcl.c_type = iswap32(TS_TAPE);
        spcl.c_date = iswap32(spcl.c_date);
        spcl.c_ddate = iswap32(spcl.c_ddate);
        if (!Tflag)
                getdumptime();          /* /etc/dumpdates snarfed */

        date = iswap32(spcl.c_date);
        msg("Date of this level %c dump: %s", level,
                spcl.c_date == 0 ? "the epoch\n" : ctime(&date));
        date = iswap32(spcl.c_ddate);
        msg("Date of last level %c dump: %s", lastlevel,
                spcl.c_ddate == 0 ? "the epoch\n" : ctime(&date));
        msg("Dumping ");
        if (snap_backup != NULL || snap_internal)
                msgtail("a snapshot of ");
        if (dirc != 0)
                msgtail("a subset of ");
        msgtail("%s (%s) ", disk, spcl.c_filesys);
        if (host)
                msgtail("to %s on host %s\n", tape, host);
        else
                msgtail("to %s\n", tape);
        msg("Label: %s\n", labelstr);

        ufsib = fs_parametrize();

        dev_bshift = ffs(dev_bsize) - 1;
        if (dev_bsize != (1 << dev_bshift))
                quit("dev_bsize (%ld) is not a power of 2", dev_bsize);
        tp_bshift = ffs(TP_BSIZE) - 1;
        if (TP_BSIZE != (1 << tp_bshift))
                quit("TP_BSIZE (%d) is not a power of 2", TP_BSIZE);
        maxino = fs_maxino();
        mapsize = roundup(howmany(maxino, NBBY), TP_BSIZE);
        usedinomap = (char *)xcalloc((unsigned) mapsize, sizeof(char));
        dumpdirmap = (char *)xcalloc((unsigned) mapsize, sizeof(char));
        dumpinomap = (char *)xcalloc((unsigned) mapsize, sizeof(char));
        tapesize = 3 * (howmany(mapsize * sizeof(char), TP_BSIZE) + 1);

        nonodump = iswap32(spcl.c_level) < honorlevel;

        initcache(readcache, readblksize);

        (void)signal(SIGINFO, statussig);

        msg("mapping (Pass I) [regular files]\n");
        anydirskipped = mapfiles(maxino, &tapesize, mountpoint,
            (dirc ? argv : NULL));

        msg("mapping (Pass II) [directories]\n");
        while (anydirskipped) {
                anydirskipped = mapdirs(maxino, &tapesize);
        }

        if (pipeout || unlimited) {
                tapesize += 10; /* 10 trailer blocks */
                msg("estimated %llu tape blocks.\n",
                    (unsigned long long)tapesize);
        } else {
                double fetapes;

                if (blocksperfile)
                        fetapes = (double) tapesize / blocksperfile;
                else if (cartridge) {
                        /* Estimate number of tapes, assuming streaming stops at
                           the end of each block written, and not in mid-block.
                           Assume no erroneous blocks; this can be compensated
                           for with an artificially low tape size. */
                        fetapes =
                        (         (double) tapesize     /* blocks */
                                * TP_BSIZE      /* bytes/block */
                                * (1.0/density) /* 0.1" / byte */
                          +
                                  (double) tapesize     /* blocks */
                                * (1.0/ntrec)   /* streaming-stops per block */
                                * 15.48         /* 0.1" / streaming-stop */
                        ) * (1.0 / tsize );     /* tape / 0.1" */
                } else {
                        /* Estimate number of tapes, for old fashioned 9-track
                           tape */
                        int tenthsperirg = (density == 625) ? 3 : 7;
                        fetapes =
                        (         tapesize      /* blocks */
                                * TP_BSIZE      /* bytes / block */
                                * (1.0/density) /* 0.1" / byte */
                          +
                                  tapesize      /* blocks */
                                * (1.0/ntrec)   /* IRG's / block */
                                * tenthsperirg  /* 0.1" / IRG */
                        ) * (1.0 / tsize );     /* tape / 0.1" */
                }
                etapes = fetapes;               /* truncating assignment */
                etapes++;
                /* count the dumped inodes map on each additional tape */
                tapesize += (etapes - 1) *
                        (howmany(mapsize * sizeof(char), TP_BSIZE) + 1);
                tapesize += etapes + 10;        /* headers + 10 trailer blks */
                msg("estimated %llu tape blocks on %3.2f tape(s).\n",
                    (unsigned long long)tapesize, fetapes);
        }
        /*
         * If the user only wants an estimate of the number of
         * tapes, exit now.
         */
        if (just_estimate)
                exit(X_FINOK);

        /*
         * Allocate tape buffer.
         */
        if (!alloctape())
                quit("can't allocate tape buffers - try a smaller"
                    " blocking factor.");

        startnewtape(1);
        (void)time((time_t *)&(tstart_writing));
        xferrate = 0;
        dumpmap(usedinomap, TS_CLRI, maxino - 1);

        msg("dumping (Pass III) [directories]\n");
        dirty = 0;              /* XXX just to get gcc to shut up */
        for (map = dumpdirmap, ino = 1; ino < maxino; ino++) {
                if (((ino - 1) % NBBY) == 0)    /* map is offset by 1 */
                        dirty = *map++;
                else
                        dirty >>= 1;
                if ((dirty & 1) == 0)
                        continue;
                /*
                 * Skip directory inodes deleted and maybe reallocated
                 */
                dp = getino(ino);
                if ((DIP(dp, mode) & IFMT) != IFDIR)
                        continue;
                (void)dumpino(dp, ino);
        }

        msg("dumping (Pass IV) [regular files]\n");
        for (map = dumpinomap, ino = 1; ino < maxino; ino++) {
                int mode;

                if (((ino - 1) % NBBY) == 0)    /* map is offset by 1 */
                        dirty = *map++;
                else
                        dirty >>= 1;
                if ((dirty & 1) == 0)
                        continue;
                /*
                 * Skip inodes deleted and reallocated as directories.
                 */
                dp = getino(ino);
                mode = DIP(dp, mode) & IFMT;
                if (mode == IFDIR)
                        continue;
                (void)dumpino(dp, ino);
        }

        spcl.c_type = iswap32(TS_END);
        for (i = 0; i < ntrec; i++)
                writeheader(maxino - 1);
        if (pipeout)
                msg("%lld tape blocks\n",(long long)iswap64(spcl.c_tapea));
        else
                msg("%lld tape blocks on %d volume%s\n",
                    (long long)iswap64(spcl.c_tapea), iswap32(spcl.c_volume),
                    (iswap32(spcl.c_volume) == 1) ? "" : "s");
        tnow = do_stats();
        date = iswap32(spcl.c_date);
        msg("Date of this level %c dump: %s", level,
                spcl.c_date == 0 ? "the epoch\n" : ctime(&date));
        msg("Date this dump completed:  %s", ctime(&tnow));
        msg("Average transfer rate: %d KB/s\n", xferrate / tapeno);
        putdumptime();
        trewind(0);
        broadcast("DUMP IS DONE!\a\a\n");
#ifdef DUMP_LFS
        lfs_wrap_go();
#endif /* DUMP_LFS */
        msg("DUMP IS DONE\n");
        Exit(X_FINOK);
        /* NOTREACHED */
        exit(X_FINOK);          /* XXX: to satisfy gcc */
}

static void
usage(void)
{
        const char *prog = getprogname();

        (void)fprintf(stderr,
"usage: %s [-0123456789aceFinStuX] [-B records] [-b blocksize]\n"
"            [-d density] [-f file] [-h level] [-k read-blocksize]\n"
"            [-L label] [-l timeout] [-r cachesize] [-s feet]\n"
"            [-T date] [-U dumpdev] [-x snap-backup] files-to-dump\n"
"       %s [-W | -w]\n", prog, prog);
        exit(X_STARTUP);
}

/*
 * Pick up a numeric argument.  It must be nonnegative and in the given
 * range (except that a vmax of 0 means unlimited).
 */
static long
numarg(const char *meaning, long vmin, long vmax)
{
        char *p;
        long val;

        val = strtol(optarg, &p, 10);
        if (*p)
                errx(X_STARTUP, "illegal %s -- %s", meaning, optarg);
        if (val < vmin || (vmax && val > vmax))
                errx(X_STARTUP, "%s must be between %ld and %ld",
                    meaning, vmin, vmax);
        return (val);
}

void
sig(int signo)
{

        switch(signo) {
        case SIGALRM:
        case SIGBUS:
        case SIGFPE:
        case SIGHUP:
        case SIGTERM:
        case SIGTRAP:
                if (pipeout)
                        quit("Signal on pipe: cannot recover");
                msg("Rewriting attempted as response to signal %s.\n", sys_siglist[signo]);
                (void)fflush(stderr);
                (void)fflush(stdout);
                close_rewind();
                exit(X_REWRITE);
                /* NOTREACHED */
        case SIGSEGV:
                msg("SIGSEGV: ABORTING!\n");
                (void)signal(SIGSEGV, SIG_DFL);
                (void)kill(0, SIGSEGV);
                /* NOTREACHED */
        }
}

/*
 * obsolete --
 *      Change set of key letters and ordered arguments into something
 *      getopt(3) will like.
 */
static void
obsolete(int *argcp, char **argvp[])
{
        int argc, flags;
        char *ap, **argv, *flagsp, **nargv, *p;

        /* Setup. */
        argv = *argvp;
        argc = *argcp;

        /* Return if no arguments or first argument has leading dash. */
        ap = argv[1];
        if (argc == 1 || *ap == '-')
                return;

        /* Allocate space for new arguments. */
        *argvp = nargv = xmalloc((argc + 1) * sizeof(char *));
        p = flagsp = xmalloc(strlen(ap) + 2);

        *nargv++ = *argv;
        argv += 2;

        for (flags = 0; *ap; ++ap) {
                switch (*ap) {
                case 'B':
                case 'b':
                case 'd':
                case 'f':
                case 'h':
                case 's':
                case 'T':
                case 'x':
                        if (*argv == NULL) {
                                warnx("option requires an argument -- %c", *ap);
                                usage();
                        }
                        nargv[0] = xmalloc(strlen(*argv) + 2 + 1);
                        nargv[0][0] = '-';
                        nargv[0][1] = *ap;
                        (void)strcpy(&nargv[0][2], *argv); /* XXX safe strcpy */
                        ++argv;
                        ++nargv;
                        break;
                default:
                        if (!flags) {
                                *p++ = '-';
                                flags = 1;
                        }
                        *p++ = *ap;
                        break;
                }
        }

        /* Terminate flags. */
        if (flags) {
                *p = '\0';
                *nargv++ = flagsp;
        } else
                free(flagsp);

        /* Copy remaining arguments. */
        while ((*nargv++ = *argv++) != NULL)
                ;

        /* Update argument count. */
        *argcp = nargv - *argvp - 1;
}


void *
xcalloc(size_t number, size_t size)
{
        void *p;

        p = calloc(number, size);
        if (p == NULL)
                quite(errno, "Can't allocate %zu bytes", size * number);
        return (p);
}

void *
xmalloc(size_t size)
{
        void *p;

        p = malloc(size);
        if (p == NULL)
                quite(errno, "Can't allocate %zu bytes", size);
        return (p);
}

char *
xstrdup(const char *str)
{
        char *p;

        p = strdup(str);
        if (p == NULL)
                quite(errno, "Can't copy %s", str);
        return (p);
}