/*-
 * SPDX-License-Identifier: BSD-3-Clause
 *
 * Copyright (c) 1983, 1993
 *      The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 *
 * 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/param.h>
#include <sys/file.h>
#include <sys/mtio.h>
#include <sys/queue.h>
#include <sys/stat.h>
#include <sys/time.h>
#include <sys/extattr.h>
#include <sys/acl.h>

#include <ufs/ufs/extattr.h>
#include <ufs/ufs/dinode.h>
#include <protocols/dumprestore.h>

#include <errno.h>
#include <limits.h>
#include <paths.h>
#include <setjmp.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <timeconv.h>
#include <unistd.h>

#include "restore.h"
#include "extern.h"

static long     fssize = MAXBSIZE;
static int      mt = -1;
static int      pipein = 0;
static int      pipecmdin = 0;
static FILE     *popenfp = NULL;
static char     *magtape;
static int      blkcnt;
static int      numtrec;
static char     *tapebuf;
static union    u_spcl endoftapemark;
static long     byteslide = 0;
static long     blksread;               /* blocks read since last header */
static int64_t  tapeaddr = 0;           /* current TP_BSIZE tape record */
static long     tapesread;
static jmp_buf  restart;
static int      gettingfile = 0;        /* restart has a valid frame */
static char     *host = NULL;
static int      readmapflag;

static int      ofile;
static char     *map;
static char     lnkbuf[MAXPATHLEN + 1];
static int      pathlen;

struct context  curfile;        /* describes next file available on the tape */
union u_spcl    u_spcl;         /* mapping of variables in a control block */
int             Bcvt;           /* Swap Bytes */
int             oldinofmt;      /* FreeBSD 1 inode format needs cvt */

#define FLUSHTAPEBUF()  blkcnt = ntrec + 1

char *namespace_names[] = EXTATTR_NAMESPACE_NAMES;

static void      accthdr(struct s_spcl *);
static int       checksum(int *);
static void      findinode(struct s_spcl *);
static void      findtapeblksize(void);
static char     *setupextattr(int);
static void      xtrattr(char *, size_t);
static void      skiphole(void (*)(char *, size_t), size_t *);
static int       gethead(struct s_spcl *);
static void      readtape(char *);
static void      setdumpnum(void);
static u_long    swabl(u_long);
static u_char   *swablong(u_char *, int);
static u_char   *swabshort(u_char *, int);
static void      terminateinput(void);
static void      xtrfile(char *, size_t);
static void      xtrlnkfile(char *, size_t);
static void      xtrlnkskip(char *, size_t);
static void      xtrmap(char *, size_t);
static void      xtrmapskip(char *, size_t);
static void      xtrskip(char *, size_t);

/*
 * Set up an input source
 */
void
setinput(char *source, int ispipecommand)
{
        FLUSHTAPEBUF();
        if (bflag)
                newtapebuf(ntrec);
        else
                newtapebuf(MAX(NTREC, HIGHDENSITYTREC));
        terminal = stdin;

        if (ispipecommand)
                pipecmdin++;
        else
#ifdef RRESTORE
        if (strchr(source, ':')) {
                host = source;
                source = strchr(host, ':');
                *source++ = '\0';
                if (rmthost(host) == 0)
                        done(1);
        } else
#endif
        if (strcmp(source, "-") == 0) {
                /*
                 * Since input is coming from a pipe we must establish
                 * our own connection to the terminal.
                 */
                terminal = fopen(_PATH_TTY, "r");
                if (terminal == NULL) {
                        (void)fprintf(stderr, "cannot open %s: %s\n",
                            _PATH_TTY, strerror(errno));
                        terminal = fopen(_PATH_DEVNULL, "r");
                        if (terminal == NULL) {
                                (void)fprintf(stderr, "cannot open %s: %s\n",
                                    _PATH_DEVNULL, strerror(errno));
                                done(1);
                        }
                }
                pipein++;
        }
        /* no longer need or want root privileges */
        if (setuid(getuid()) != 0) {
                fprintf(stderr, "setuid failed\n");
                done(1);
        }
        magtape = strdup(source);
        if (magtape == NULL) {
                fprintf(stderr, "Cannot allocate space for magtape buffer\n");
                done(1);
        }
}

void
newtapebuf(long size)
{
        static int tapebufsize = -1;

        ntrec = size;
        if (size <= tapebufsize)
                return;
        if (tapebuf != NULL)
                free(tapebuf - TP_BSIZE);
        tapebuf = malloc((size+1) * TP_BSIZE);
        if (tapebuf == NULL) {
                fprintf(stderr, "Cannot allocate space for tape buffer\n");
                done(1);
        }
        tapebuf += TP_BSIZE;
        tapebufsize = size;
}

/*
 * Verify that the tape drive can be accessed and
 * that it actually is a dump tape.
 */
void
setup(void)
{
        int i, j, *ip;
        struct stat stbuf;

        vprintf(stdout, "Verify tape and initialize maps\n");
        if (pipecmdin) {
                if (setenv("RESTORE_VOLUME", "1", 1) == -1) {
                        fprintf(stderr, "Cannot set $RESTORE_VOLUME: %s\n",
                            strerror(errno));
                        done(1);
                }
                popenfp = popen(magtape, "r");
                mt = popenfp ? fileno(popenfp) : -1;
        } else
#ifdef RRESTORE
        if (host)
                mt = rmtopen(magtape, 0);
        else
#endif
        if (pipein)
                mt = 0;
        else
                mt = open(magtape, O_RDONLY, 0);
        if (mt < 0) {
                fprintf(stderr, "%s: %s\n", magtape, strerror(errno));
                done(1);
        }
        volno = 1;
        setdumpnum();
        FLUSHTAPEBUF();
        if (!pipein && !pipecmdin && !bflag)
                findtapeblksize();
        if (gethead(&spcl) == FAIL) {
                fprintf(stderr, "Tape is not a dump tape\n");
                done(1);
        }
        if (pipein) {
                endoftapemark.s_spcl.c_magic = FS_UFS2_MAGIC;
                endoftapemark.s_spcl.c_type = TS_END;
                ip = (int *)&endoftapemark;
                j = sizeof(union u_spcl) / sizeof(int);
                i = 0;
                do
                        i += *ip++;
                while (--j);
                endoftapemark.s_spcl.c_checksum = CHECKSUM - i;
        }
        if (vflag || command == 't')
                printdumpinfo();
        dumptime = _time64_to_time(spcl.c_ddate);
        dumpdate = _time64_to_time(spcl.c_date);
        if (stat(".", &stbuf) < 0) {
                fprintf(stderr, "cannot stat .: %s\n", strerror(errno));
                done(1);
        }
        if (stbuf.st_blksize > 0 && stbuf.st_blksize < TP_BSIZE )
                fssize = TP_BSIZE;
        if (stbuf.st_blksize >= TP_BSIZE && stbuf.st_blksize <= MAXBSIZE)
                fssize = stbuf.st_blksize;
        if (((TP_BSIZE - 1) & stbuf.st_blksize) != 0) {
                fprintf(stderr, "Warning: filesystem with non-multiple-of-%d "
                    "blocksize (%d);\n", TP_BSIZE, stbuf.st_blksize);
                fssize = roundup(fssize, TP_BSIZE);
                fprintf(stderr, "\twriting using blocksize %ld\n", fssize);
        }
        if (spcl.c_volume != 1) {
                fprintf(stderr, "Tape is not volume 1 of the dump\n");
                done(1);
        }
        if (gethead(&spcl) == FAIL) {
                dprintf(stdout, "header read failed at %ld blocks\n", blksread);
                panic("no header after volume mark!\n");
        }
        findinode(&spcl);
        if (spcl.c_type != TS_CLRI) {
                fprintf(stderr, "Cannot find file removal list\n");
                done(1);
        }
        maxino = (spcl.c_count * TP_BSIZE * NBBY) + 1;
        dprintf(stdout, "maxino = %ju\n", (uintmax_t)maxino);
        map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY));
        if (map == NULL)
                panic("no memory for active inode map\n");
        usedinomap = map;
        curfile.action = USING;
        getfile(xtrmap, xtrmapskip, xtrmapskip);
        if (spcl.c_type != TS_BITS) {
                fprintf(stderr, "Cannot find file dump list\n");
                done(1);
        }
        map = calloc((unsigned)1, (unsigned)howmany(maxino, NBBY));
        if (map == (char *)NULL)
                panic("no memory for file dump list\n");
        dumpmap = map;
        curfile.action = USING;
        getfile(xtrmap, xtrmapskip, xtrmapskip);
        /*
         * If there may be whiteout entries on the tape, pretend that the
         * whiteout inode exists, so that the whiteout entries can be
         * extracted.
         */
        SETINO(UFS_WINO, dumpmap);
        /* 'r' restores don't call getvol() for tape 1, so mark it as read. */
        if (command == 'r')
                tapesread = 1;
}

/*
 * Prompt user to load a new dump volume.
 * "Nextvol" is the next suggested volume to use.
 * This suggested volume is enforced when doing full
 * or incremental restores, but can be overridden by
 * the user when only extracting a subset of the files.
 */
void
getvol(long nextvol)
{
        int64_t prevtapea;
        long i, newvol, savecnt;
        union u_spcl tmpspcl;
#       define tmpbuf tmpspcl.s_spcl
        char buf[TP_BSIZE];

        if (nextvol == 1) {
                tapesread = 0;
                gettingfile = 0;
        }
        prevtapea = tapeaddr;
        savecnt = blksread;
        if (pipein) {
                if (nextvol != 1) {
                        panic("Changing volumes on pipe input?\n");
                        /* Avoid looping if we couldn't ask the user. */
                        if (yflag || ferror(terminal) || feof(terminal))
                                done(1);
                }
                if (volno == 1)
                        return;
                newvol = 0;
                goto gethdr;
        }
again:
        if (pipein)
                done(1); /* pipes do not get a second chance */
        if (command == 'R' || command == 'r' || curfile.action != SKIP)
                newvol = nextvol;
        else
                newvol = 0;
        while (newvol <= 0) {
                if (tapesread == 0) {
                        fprintf(stderr, "%s%s%s%s%s%s%s",
                            "You have not read any tapes yet.\n",
                            "If you are extracting just a few files,",
                            " start with the last volume\n",
                            "and work towards the first; restore",
                            " can quickly skip tapes that\n",
                            "have no further files to extract.",
                            " Otherwise, begin with volume 1.\n");
                } else {
                        fprintf(stderr, "You have read volumes");
                        strcpy(buf, ": ");
                        for (i = 0; i < 32; i++)
                                if (tapesread & (1 << i)) {
                                        fprintf(stderr, "%s%ld", buf, i + 1);
                                        strcpy(buf, ", ");
                                }
                        fprintf(stderr, "\n");
                }
                do      {
                        fprintf(stderr, "Specify next volume #: ");
                        (void) fflush(stderr);
                        if (fgets(buf, BUFSIZ, terminal) == NULL)
                                done(1);
                } while (buf[0] == '\n');
                newvol = atoi(buf);
                if (newvol <= 0) {
                        fprintf(stderr,
                            "Volume numbers are positive numerics\n");
                }
        }
        if (newvol == volno) {
                tapesread |= 1 << (volno - 1);
                return;
        }
        closemt();
        fprintf(stderr, "Mount tape volume %ld\n", newvol);
        fprintf(stderr, "Enter ``none'' if there are no more tapes\n");
        fprintf(stderr, "otherwise enter tape name (default: %s) ", magtape);
        (void) fflush(stderr);
        if (fgets(buf, BUFSIZ, terminal) == NULL)
                done(1);
        if (!strcmp(buf, "none\n")) {
                terminateinput();
                return;
        }
        if (buf[0] != '\n') {
                (void) strcpy(magtape, buf);
                magtape[strlen(magtape) - 1] = '\0';
        }
        if (pipecmdin) {
                char volno[sizeof("2147483647")];

                (void)sprintf(volno, "%ld", newvol);
                if (setenv("RESTORE_VOLUME", volno, 1) == -1) {
                        fprintf(stderr, "Cannot set $RESTORE_VOLUME: %s\n",
                            strerror(errno));
                        done(1);
                }
                popenfp = popen(magtape, "r");
                mt = popenfp ? fileno(popenfp) : -1;
        } else
#ifdef RRESTORE
        if (host)
                mt = rmtopen(magtape, 0);
        else
#endif
                mt = open(magtape, O_RDONLY, 0);

        if (mt == -1) {
                fprintf(stderr, "Cannot open %s\n", magtape);
                volno = -1;
                goto again;
        }
gethdr:
        volno = newvol;
        setdumpnum();
        FLUSHTAPEBUF();
        if (gethead(&tmpbuf) == FAIL) {
                dprintf(stdout, "header read failed at %ld blocks\n", blksread);
                fprintf(stderr, "tape is not dump tape\n");
                volno = 0;
                goto again;
        }
        if (tmpbuf.c_volume != volno) {
                fprintf(stderr, "Wrong volume (%jd)\n",
                    (intmax_t)tmpbuf.c_volume);
                volno = 0;
                goto again;
        }
        if (_time64_to_time(tmpbuf.c_date) != dumpdate ||
            _time64_to_time(tmpbuf.c_ddate) != dumptime) {
                time_t t = _time64_to_time(tmpbuf.c_date);
                fprintf(stderr, "Wrong dump date\n\tgot: %s", ctime(&t));
                fprintf(stderr, "\twanted: %s", ctime(&dumpdate));
                volno = 0;
                goto again;
        }
        tapesread |= 1 << (volno - 1);
        blksread = savecnt;
        /*
         * If continuing from the previous volume, skip over any
         * blocks read already at the end of the previous volume.
         *
         * If coming to this volume at random, skip to the beginning
         * of the next record.
         */
        dprintf(stdout, "last rec %jd, tape starts with %jd\n",
            (intmax_t)prevtapea, (intmax_t)tmpbuf.c_tapea);
        if (tmpbuf.c_type == TS_TAPE) {
                if (curfile.action != USING) {
                        /*
                         * XXX Dump incorrectly sets c_count to 1 in the
                         * volume header of the first tape, so ignore
                         * c_count when volno == 1.
                         */
                        if (volno != 1)
                                for (i = tmpbuf.c_count; i > 0; i--)
                                        readtape(buf);
                } else if (tmpbuf.c_tapea <= prevtapea) {
                        /*
                         * Normally the value of c_tapea in the volume
                         * header is the record number of the header itself.
                         * However in the volume header following an EOT-
                         * terminated tape, it is the record number of the
                         * first continuation data block (dump bug?).
                         *
                         * The next record we want is `prevtapea + 1'.
                         */
                        i = prevtapea + 1 - tmpbuf.c_tapea;
                        dprintf(stderr, "Skipping %ld duplicate record%s.\n",
                                i, i > 1 ? "s" : "");
                        while (--i >= 0)
                                readtape(buf);
                }
        }
        if (curfile.action == USING) {
                if (volno == 1)
                        panic("active file into volume 1\n");
                return;
        }
        (void) gethead(&spcl);
        findinode(&spcl);
        if (gettingfile) {
                gettingfile = 0;
                longjmp(restart, 1);
        }
}

/*
 * Handle unexpected EOF.
 */
static void
terminateinput(void)
{

        if (gettingfile && curfile.action == USING) {
                printf("Warning: %s %s\n",
                    "End-of-input encountered while extracting", curfile.name);
        }
        curfile.name = "<name unknown>";
        curfile.action = UNKNOWN;
        curfile.mode = 0;
        curfile.ino = maxino;
        if (gettingfile) {
                gettingfile = 0;
                longjmp(restart, 1);
        }
}

/*
 * handle multiple dumps per tape by skipping forward to the
 * appropriate one.
 */
static void
setdumpnum(void)
{
        struct mtop tcom;

        if (dumpnum == 1 || volno != 1)
                return;
        if (pipein) {
                fprintf(stderr, "Cannot have multiple dumps on pipe input\n");
                done(1);
        }
        tcom.mt_op = MTFSF;
        tcom.mt_count = dumpnum - 1;
#ifdef RRESTORE
        if (host)
                rmtioctl(MTFSF, dumpnum - 1);
        else
#endif
                if (!pipecmdin && ioctl(mt, MTIOCTOP, (char *)&tcom) < 0)
                        fprintf(stderr, "ioctl MTFSF: %s\n", strerror(errno));
}

void
printdumpinfo(void)
{
        time_t t;
        t = _time64_to_time(spcl.c_date);
        fprintf(stdout, "Dump   date: %s", ctime(&t));
        t = _time64_to_time(spcl.c_ddate);
        fprintf(stdout, "Dumped from: %s",
            (spcl.c_ddate == 0) ? "the epoch\n" : ctime(&t));
        if (spcl.c_host[0] == '\0')
                return;
        fprintf(stderr, "Level %jd dump of %s on %s:%s\n",
            (intmax_t)spcl.c_level, spcl.c_filesys, spcl.c_host, spcl.c_dev);
        fprintf(stderr, "Label: %s\n", spcl.c_label);
}

int
extractfile(char *name)
{
        u_int flags;
        uid_t uid;
        gid_t gid;
        mode_t mode;
        int extsize;
        struct timespec mtimep[2], ctimep[2];
        struct entry *ep;
        char *buf;

        curfile.name = name;
        curfile.action = USING;
        mtimep[0].tv_sec = curfile.atime_sec;
        mtimep[0].tv_nsec = curfile.atime_nsec;
        mtimep[1].tv_sec = curfile.mtime_sec;
        mtimep[1].tv_nsec = curfile.mtime_nsec;
        ctimep[0].tv_sec = curfile.atime_sec;
        ctimep[0].tv_nsec = curfile.atime_nsec;
        ctimep[1].tv_sec = curfile.birthtime_sec;
        ctimep[1].tv_nsec = curfile.birthtime_nsec;
        extsize = curfile.extsize;
        uid = getuid();
        if (uid == 0)
                uid = curfile.uid;
        gid = curfile.gid;
        mode = curfile.mode;
        flags = curfile.file_flags;
        switch (mode & IFMT) {

        default:
                fprintf(stderr, "%s: unknown file mode 0%o\n", name, mode);
                skipfile();
                return (FAIL);

        case IFSOCK:
                vprintf(stdout, "skipped socket %s\n", name);
                skipfile();
                return (GOOD);

        case IFDIR:
                if (mflag) {
                        ep = lookupname(name);
                        if (ep == NULL || ep->e_flags & EXTRACT)
                                panic("unextracted directory %s\n", name);
                        skipfile();
                        return (GOOD);
                }
                vprintf(stdout, "extract file %s\n", name);
                return (genliteraldir(name, curfile.ino));

        case IFLNK:
                lnkbuf[0] = '\0';
                pathlen = 0;
                buf = setupextattr(extsize);
                getfile(xtrlnkfile, xtrattr, xtrlnkskip);
                if (pathlen == 0) {
                        vprintf(stdout,
                            "%s: zero length symbolic link (ignored)\n", name);
                        return (GOOD);
                }
                if (linkit(lnkbuf, name, SYMLINK) == GOOD) {
                        (void) lchown(name, uid, gid);
                        (void) lchmod(name, mode);
                        if (extsize > 0)
                                set_extattr(-1, name, buf, extsize, SXA_LINK);
                        (void) utimensat(AT_FDCWD, name, ctimep,
                            AT_SYMLINK_NOFOLLOW);
                        (void) utimensat(AT_FDCWD, name, mtimep,
                            AT_SYMLINK_NOFOLLOW);
                        (void) lchflags(name, flags);
                        return (GOOD);
                }
                return (FAIL);

        case IFIFO:
                vprintf(stdout, "extract fifo %s\n", name);
                if (Nflag) {
                        skipfile();
                        return (GOOD);
                }
                if (uflag)
                        (void) unlink(name);
                if (mkfifo(name, 0600) < 0) {
                        fprintf(stderr, "%s: cannot create fifo: %s\n",
                            name, strerror(errno));
                        skipfile();
                        return (FAIL);
                }
                (void) chown(name, uid, gid);
                (void) chmod(name, mode);
                if (extsize == 0) {
                        skipfile();
                } else {
                        buf = setupextattr(extsize);
                        getfile(xtrnull, xtrattr, xtrnull);
                        set_extattr(-1, name, buf, extsize, SXA_FILE);
                }
                (void) utimensat(AT_FDCWD, name, ctimep, 0);
                (void) utimensat(AT_FDCWD, name, mtimep, 0);
                (void) chflags(name, flags);
                return (GOOD);

        case IFCHR:
        case IFBLK:
                vprintf(stdout, "extract special file %s\n", name);
                if (Nflag) {
                        skipfile();
                        return (GOOD);
                }
                if (uflag)
                        (void) unlink(name);
                if (mknod(name, (mode & (IFCHR | IFBLK)) | 0600,
                    (int)curfile.rdev) < 0) {
                        fprintf(stderr, "%s: cannot create special file: %s\n",
                            name, strerror(errno));
                        skipfile();
                        return (FAIL);
                }
                (void) chown(name, uid, gid);
                (void) chmod(name, mode);
                if (extsize == 0) {
                        skipfile();
                } else {
                        buf = setupextattr(extsize);
                        getfile(xtrnull, xtrattr, xtrnull);
                        set_extattr(-1, name, buf, extsize, SXA_FILE);
                }
                (void) utimensat(AT_FDCWD, name, ctimep, 0);
                (void) utimensat(AT_FDCWD, name, mtimep, 0);
                (void) chflags(name, flags);
                return (GOOD);

        case IFREG:
                vprintf(stdout, "extract file %s\n", name);
                if (Nflag) {
                        skipfile();
                        return (GOOD);
                }
                if (uflag)
                        (void) unlink(name);
                if ((ofile = open(name, O_WRONLY | O_CREAT | O_TRUNC,
                    0600)) < 0) {
                        fprintf(stderr, "%s: cannot create file: %s\n",
                            name, strerror(errno));
                        skipfile();
                        return (FAIL);
                }
                (void) fchown(ofile, uid, gid);
                (void) fchmod(ofile, mode);
                buf = setupextattr(extsize);
                getfile(xtrfile, xtrattr, xtrskip);
                if (extsize > 0)
                        set_extattr(ofile, name, buf, extsize, SXA_FD);
                (void) futimens(ofile, ctimep);
                (void) futimens(ofile, mtimep);
                (void) fchflags(ofile, flags);
                (void) close(ofile);
                return (GOOD);
        }
        /* NOTREACHED */
}

/*
 * Set attributes on a file descriptor, link, or file.
 */
void
set_extattr(int fd, char *name, void *buf, int size, enum set_extattr_mode mode)
{
        struct extattr *eap, *eaend;
        const char *method;
        ssize_t res;
        int error;
        char eaname[EXTATTR_MAXNAMELEN + 1];

        vprintf(stdout, "Set attributes for %s:", name);
        eaend = buf + size;
        for (eap = buf; eap < eaend; eap = EXTATTR_NEXT(eap)) {
                /*
                 * Make sure this entry is complete.
                 */
                if (EXTATTR_NEXT(eap) > eaend || eap->ea_length <= 0) {
                        dprintf(stdout, "\n\t%scorrupted",
                                eap == buf ? "" : "remainder ");
                        break;
                }
                if (eap->ea_namespace == EXTATTR_NAMESPACE_EMPTY)
                        continue;
                snprintf(eaname, sizeof(eaname), "%.*s",
                    (int)eap->ea_namelength, eap->ea_name);
                vprintf(stdout, "\n\t%s, (%d bytes), %s",
                        namespace_names[eap->ea_namespace], eap->ea_length,
                        eaname);
                /*
                 * First we try the general attribute setting interface.
                 * However, some attributes can only be set by root or
                 * by using special interfaces (for example, ACLs).
                 */
                if (mode == SXA_FD) {
                        res = extattr_set_fd(fd, eap->ea_namespace,
                            eaname, EXTATTR_CONTENT(eap),
                            EXTATTR_CONTENT_SIZE(eap));
                        method = "extattr_set_fd";
                } else if (mode == SXA_LINK) {
                        res = extattr_set_link(name, eap->ea_namespace,
                            eaname, EXTATTR_CONTENT(eap),
                            EXTATTR_CONTENT_SIZE(eap));
                        method = "extattr_set_link";
                } else if (mode == SXA_FILE) {
                        res = extattr_set_file(name, eap->ea_namespace,
                            eaname, EXTATTR_CONTENT(eap),
                            EXTATTR_CONTENT_SIZE(eap));
                        method = "extattr_set_file";
                }
                if (res != -1) {
                        dprintf(stdout, " (set using %s)", method);
                        continue;
                }
                /*
                 * If the general interface refuses to set the attribute,
                 * then we try all the specialized interfaces that we
                 * know about.
                 */
                if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
                    strcmp(eaname, POSIX1E_ACL_ACCESS_EXTATTR_NAME) == 0) {
                        if (mode == SXA_FD) {
                                error = acl_set_fd(fd, EXTATTR_CONTENT(eap));
                                method = "acl_set_fd";
                        } else if (mode == SXA_LINK) {
                                error = acl_set_link_np(name, ACL_TYPE_ACCESS,
                                    EXTATTR_CONTENT(eap));
                                method = "acl_set_link_np";
                        } else if (mode == SXA_FILE) {
                                error = acl_set_file(name, ACL_TYPE_ACCESS,
                                    EXTATTR_CONTENT(eap));
                                method = "acl_set_file";
                        }
                        if (error != -1) {
                                dprintf(stdout, " (set using %s)", method);
                                continue;
                        }
                }
                if (eap->ea_namespace == EXTATTR_NAMESPACE_SYSTEM &&
                    strcmp(eaname, POSIX1E_ACL_DEFAULT_EXTATTR_NAME) == 0) {
                        if (mode == SXA_LINK) {
                                error = acl_set_link_np(name, ACL_TYPE_DEFAULT,
                                    EXTATTR_CONTENT(eap));
                                method = "acl_set_link_np";
                        } else {
                                error = acl_set_file(name, ACL_TYPE_DEFAULT,
                                    EXTATTR_CONTENT(eap));
                                method = "acl_set_file";
                        }
                        if (error != -1) {
                                dprintf(stdout, " (set using %s)", method);
                                continue;
                        }
                }
                vprintf(stdout, " (unable to set)");
        }
        vprintf(stdout, "\n");
}

/*
 * skip over bit maps on the tape
 */
void
skipmaps(void)
{

        while (spcl.c_type == TS_BITS || spcl.c_type == TS_CLRI)
                skipfile();
}

/*
 * skip over a file on the tape
 */
void
skipfile(void)
{

        curfile.action = SKIP;
        getfile(xtrnull, xtrnull, xtrnull);
}

/*
 * Skip a hole in an output file
 */
static void
skiphole(void (*skip)(char *, size_t), size_t *seekpos)
{
        char buf[MAXBSIZE];

        if (*seekpos > 0) {
                (*skip)(buf, *seekpos);
                *seekpos = 0;
        }
}

/*
 * Extract a file from the tape.
 * When an allocated block is found it is passed to the fill function;
 * when an unallocated block (hole) is found, a zeroed buffer is passed
 * to the skip function.
 */
void
getfile(void (*datafill)(char *, size_t), void (*attrfill)(char *, size_t),
        void (*skip)(char *, size_t))
{
        int i;
        volatile off_t size;
        size_t seekpos;
        int curblk, attrsize;
        void (*fillit)(char *, size_t);
        char buf[MAXBSIZE / TP_BSIZE][TP_BSIZE];
        char junk[TP_BSIZE];

        curblk = 0;
        size = spcl.c_size;
        seekpos = 0;
        attrsize = spcl.c_extsize;
        if (spcl.c_type == TS_END)
                panic("ran off end of tape\n");
        if (spcl.c_magic != FS_UFS2_MAGIC)
                panic("not at beginning of a file\n");
        if (!gettingfile && setjmp(restart) != 0)
                return;
        gettingfile++;
        fillit = datafill;
        if (size == 0 && attrsize > 0) {
                fillit = attrfill;
                size = attrsize;
                attrsize = 0;
        }
loop:
        for (i = 0; i < spcl.c_count; i++) {
                if (!readmapflag && i > TP_NINDIR) {
                        if (Dflag) {
                                fprintf(stderr, "spcl.c_count = %jd\n",
                                    (intmax_t)spcl.c_count);
                                break;
                        } else
                                panic("spcl.c_count = %jd\n",
                                    (intmax_t)spcl.c_count);
                }
                if (readmapflag || spcl.c_addr[i]) {
                        readtape(&buf[curblk++][0]);
                        if (curblk == fssize / TP_BSIZE) {
                                skiphole(skip, &seekpos);
                                (*fillit)((char *)buf, (long)(size > TP_BSIZE ?
                                     fssize : (curblk - 1) * TP_BSIZE + size));
                                curblk = 0;
                        }
                } else {
                        if (curblk > 0) {
                                skiphole(skip, &seekpos);
                                (*fillit)((char *)buf, (long)(size > TP_BSIZE ?
                                     curblk * TP_BSIZE :
                                     (curblk - 1) * TP_BSIZE + size));
                                curblk = 0;
                        }
                        /*
                         * We have a block of a hole. Don't skip it
                         * now, because there may be next adjacent
                         * block of the hole in the file. Postpone the
                         * seek until next file write.
                         */
                        seekpos += (long)MIN(TP_BSIZE, size);
                }
                if ((size -= TP_BSIZE) <= 0) {
                        if (size > -TP_BSIZE && curblk > 0) {
                                skiphole(skip, &seekpos);
                                (*fillit)((char *)buf,
                                        (long)((curblk * TP_BSIZE) + size));
                                curblk = 0;
                        }
                        if (attrsize > 0) {
                                fillit = attrfill;
                                size = attrsize;
                                attrsize = 0;
                                continue;
                        }
                        if (spcl.c_count - i > 1)
                                dprintf(stdout, "skipping %d junk block(s)\n",
                                        spcl.c_count - i - 1);
                        for (i++; i < spcl.c_count; i++) {
                                if (!readmapflag && i > TP_NINDIR) {
                                        if (Dflag) {
                                                fprintf(stderr,
                                                    "spcl.c_count = %jd\n",
                                                    (intmax_t)spcl.c_count);
                                                break;
                                        } else 
                                                panic("spcl.c_count = %jd\n",
                                                    (intmax_t)spcl.c_count);
                                }
                                if (readmapflag || spcl.c_addr[i])
                                        readtape(junk);
                        }
                        break;
                }
        }
        if (gethead(&spcl) == GOOD && size > 0) {
                if (spcl.c_type == TS_ADDR)
                        goto loop;
                dprintf(stdout,
                        "Missing address (header) block for %s at %ld blocks\n",
                        curfile.name, blksread);
        }
        if (curblk > 0)
                panic("getfile: lost data\n");
        findinode(&spcl);
        gettingfile = 0;
}

/*
 * These variables are shared between the next two functions.
 */
static int extbufsize = 0;
static char *extbuf;
static int extloc;

/*
 * Allocate a buffer into which to extract extended attributes.
 */
static char *
setupextattr(int extsize)
{

        extloc = 0;
        if (extsize <= extbufsize)
                return (extbuf);
        if (extbufsize > 0)
                free(extbuf);
        if ((extbuf = malloc(extsize)) != NULL) {
                extbufsize = extsize;
                return (extbuf);
        }
        extbufsize = 0;
        extbuf = NULL;
        fprintf(stderr, "Cannot extract %d bytes %s for inode %ju, name %s\n",
            extsize, "of extended attributes", (uintmax_t)curfile.ino,
            curfile.name);
        return (NULL);
}

/*
 * Extract the next block of extended attributes.
 */
static void
xtrattr(char *buf, size_t size)
{

        if (extloc + size > extbufsize)
                panic("overrun attribute buffer\n");
        memmove(&extbuf[extloc], buf, size);
        extloc += size;
}

/*
 * Write out the next block of a file.
 */
static void
xtrfile(char *buf, size_t size)
{

        if (Nflag)
                return;
        if (write(ofile, buf, (int) size) == -1) {
                fprintf(stderr,
                    "write error extracting inode %ju, name %s\nwrite: %s\n",
                    (uintmax_t)curfile.ino, curfile.name, strerror(errno));
        }
}

/*
 * Skip over a hole in a file.
 */
/* ARGSUSED */
static void
xtrskip(char *buf, size_t size)
{

        if (lseek(ofile, size, SEEK_CUR) == -1) {
                fprintf(stderr,
                    "seek error extracting inode %ju, name %s\nlseek: %s\n",
                    (uintmax_t)curfile.ino, curfile.name, strerror(errno));
                done(1);
        }
}

/*
 * Collect the next block of a symbolic link.
 */
static void
xtrlnkfile(char *buf, size_t size)
{

        pathlen += size;
        if (pathlen > MAXPATHLEN) {
                fprintf(stderr, "symbolic link name: %s->%s%s; too long %d\n",
                    curfile.name, lnkbuf, buf, pathlen);
                done(1);
        }
        (void) strcat(lnkbuf, buf);
}

/*
 * Skip over a hole in a symbolic link (should never happen).
 */
/* ARGSUSED */
static void
xtrlnkskip(char *buf, size_t size)
{

        fprintf(stderr, "unallocated block in symbolic link %s\n",
                curfile.name);
        done(1);
}

/*
 * Collect the next block of a bit map.
 */
static void
xtrmap(char *buf, size_t size)
{

        memmove(map, buf, size);
        map += size;
}

/*
 * Skip over a hole in a bit map (should never happen).
 */
/* ARGSUSED */
static void
xtrmapskip(char *buf, size_t size)
{

        panic("hole in map\n");
        map += size;
}

/*
 * Noop, when an extraction function is not needed.
 */
/* ARGSUSED */
void
xtrnull(char *buf, size_t size)
{

        return;
}

/*
 * Read TP_BSIZE blocks from the input.
 * Handle read errors, and end of media.
 */
static void
readtape(char *buf)
{
        long rd, newvol, i, oldnumtrec;
        int cnt, seek_failed;

        if (blkcnt + (byteslide > 0) < numtrec) {
                memmove(buf, &tapebuf[(blkcnt++ * TP_BSIZE) + byteslide], (long)TP_BSIZE);
                blksread++;
                tapeaddr++;
                return;
        }
        if (numtrec > 0)
                memmove(&tapebuf[-TP_BSIZE],
                    &tapebuf[(numtrec-1) * TP_BSIZE], (long)TP_BSIZE);
        oldnumtrec = numtrec;
        for (i = 0; i < ntrec; i++)
                ((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0;
        if (numtrec == 0)
                numtrec = ntrec;
        cnt = ntrec * TP_BSIZE;
        rd = 0;
getmore:
#ifdef RRESTORE
        if (host)
                i = rmtread(&tapebuf[rd], cnt);
        else
#endif
                i = read(mt, &tapebuf[rd], cnt);
        /*
         * Check for mid-tape short read error.
         * If found, skip rest of buffer and start with the next.
         */
        if (!pipein && !pipecmdin && numtrec < ntrec && i > 0) {
                dprintf(stdout, "mid-media short read error.\n");
                numtrec = ntrec;
        }
        /*
         * Handle partial block read.
         */
        if ((pipein || pipecmdin) && i == 0 && rd > 0)
                i = rd;
        else if (i > 0 && i != ntrec * TP_BSIZE) {
                if (pipein || pipecmdin) {
                        rd += i;
                        cnt -= i;
                        if (cnt > 0)
                                goto getmore;
                        i = rd;
                } else {
                        /*
                         * Short read. Process the blocks read.
                         */
                        if (i % TP_BSIZE != 0)
                                vprintf(stdout,
                                    "partial block read: %ld should be %ld\n",
                                    i, ntrec * TP_BSIZE);
                        numtrec = i / TP_BSIZE;
                }
        }
        /*
         * Handle read error.
         */
        if (i < 0) {
                fprintf(stderr, "Tape read error while ");
                switch (curfile.action) {
                default:
                        fprintf(stderr, "trying to set up tape\n");
                        break;
                case UNKNOWN:
                        fprintf(stderr, "trying to resynchronize\n");
                        break;
                case USING:
                        fprintf(stderr, "restoring %s\n", curfile.name);
                        break;
                case SKIP:
                        fprintf(stderr, "skipping over inode %ju\n",
                            (uintmax_t)curfile.ino);
                        break;
                }
                if (!yflag && !reply("continue"))
                        done(1);
                i = ntrec * TP_BSIZE;
                memset(tapebuf, 0, i);
#ifdef RRESTORE
                if (host)
                        seek_failed = (rmtseek(i, 1) < 0);
                else
#endif
                        seek_failed = (lseek(mt, i, SEEK_CUR) == (off_t)-1);

                if (seek_failed) {
                        fprintf(stderr,
                            "continuation failed: %s\n", strerror(errno));
                        done(1);
                }
        }
        /*
         * Handle end of tape.
         */
        if (i == 0) {
                vprintf(stdout, "End-of-tape encountered\n");
                if (!pipein) {
                        newvol = volno + 1;
                        volno = 0;
                        numtrec = 0;
                        getvol(newvol);
                        readtape(buf);
                        return;
                }
                if (rd % TP_BSIZE != 0)
                        panic("partial block read: %ld should be %ld\n",
                                rd, ntrec * TP_BSIZE);
                terminateinput();
                memmove(&tapebuf[rd], &endoftapemark, (long)TP_BSIZE);
        }
        if (oldnumtrec == 0)
                blkcnt = 0;
        else
                blkcnt -= oldnumtrec;
        memmove(buf,
            &tapebuf[(blkcnt++ * TP_BSIZE) + byteslide], (long)TP_BSIZE);
        blksread++;
        tapeaddr++;
}

static void
findtapeblksize(void)
{
        long i;

        for (i = 0; i < ntrec; i++)
                ((struct s_spcl *)&tapebuf[i * TP_BSIZE])->c_magic = 0;
        blkcnt = 0;
#ifdef RRESTORE
        if (host)
                i = rmtread(tapebuf, ntrec * TP_BSIZE);
        else
#endif
                i = read(mt, tapebuf, ntrec * TP_BSIZE);

        if (i <= 0) {
                fprintf(stderr, "tape read error: %s\n", strerror(errno));
                done(1);
        }
        if (i % TP_BSIZE != 0) {
                fprintf(stderr, "Tape block size (%ld) %s (%d)\n",
                        i, "is not a multiple of dump block size", TP_BSIZE);
                done(1);
        }
        ntrec = i / TP_BSIZE;
        numtrec = ntrec;
        vprintf(stdout, "Tape block size is %ld\n", ntrec);
}

void
closemt(void)
{

        if (mt < 0)
                return;
        if (pipecmdin) {
                pclose(popenfp);
                popenfp = NULL;
        } else
#ifdef RRESTORE
        if (host)
                rmtclose();
        else
#endif
                (void) close(mt);
}

/*
 * Read the next block from the tape.
 * If it is not any valid header, return an error.
 */
static int
gethead(struct s_spcl *buf)
{
        long i;

        readtape((char *)buf);
        if (buf->c_magic != FS_UFS2_MAGIC && buf->c_magic != NFS_MAGIC) {
                if (buf->c_magic == OFS_MAGIC) {
                        fprintf(stderr,
                            "Format of dump tape is too old. Must use\n");
                        fprintf(stderr,
                            "a version of restore from before 2002.\n");
                        return (FAIL);
                }
                if (swabl(buf->c_magic) != FS_UFS2_MAGIC &&
                    swabl(buf->c_magic) != NFS_MAGIC) {
                        if (swabl(buf->c_magic) == OFS_MAGIC) {
                                fprintf(stderr,
                                  "Format of dump tape is too old. Must use\n");
                                fprintf(stderr,
                                  "a version of restore from before 2002.\n");
                        }
                        return (FAIL);
                }
                if (!Bcvt) {
                        vprintf(stdout, "Note: Doing Byte swapping\n");
                        Bcvt = 1;
                }
        }
        if (checksum((int *)buf) == FAIL)
                return (FAIL);
        if (Bcvt) {
                swabst((u_char *)"8l4s1q8l2q17l", (u_char *)buf);
                swabst((u_char *)"l",(u_char *) &buf->c_level);
                swabst((u_char *)"2l4q",(u_char *) &buf->c_flags);
        }
        readmapflag = 0;

        switch (buf->c_type) {

        case TS_CLRI:
        case TS_BITS:
                /*
                 * Have to patch up missing information in bit map headers
                 */
                buf->c_size = buf->c_count * TP_BSIZE;
                if (buf->c_count > TP_NINDIR)
                        readmapflag = 1;
                else 
                        for (i = 0; i < buf->c_count; i++)
                                buf->c_addr[i]++;
                /* FALL THROUGH */

        case TS_TAPE:
                if (buf->c_magic == NFS_MAGIC &&
                    (buf->c_flags & NFS_DR_NEWINODEFMT) == 0)
                        oldinofmt = 1;
                /* FALL THROUGH */

        case TS_END:
                buf->c_inumber = 0;
                /* FALL THROUGH */

        case TS_ADDR:
        case TS_INODE:
                /*
                 * For old dump tapes, have to copy up old fields to
                 * new locations.
                 */
                if (buf->c_magic == NFS_MAGIC) {
                        buf->c_tapea = buf->c_old_tapea;
                        buf->c_firstrec = buf->c_old_firstrec;
                        buf->c_date = _time32_to_time(buf->c_old_date);
                        buf->c_ddate = _time32_to_time(buf->c_old_ddate);
                        buf->c_atime = _time32_to_time(buf->c_old_atime);
                        buf->c_mtime = _time32_to_time(buf->c_old_mtime);
                        buf->c_birthtime = 0;
                        buf->c_birthtimensec = 0;
                        buf->c_extsize = 0;
                }
                break;

        default:
                panic("gethead: unknown inode type %d\n", buf->c_type);
                break;
        }
        if (dumpdate != 0 && _time64_to_time(buf->c_date) != dumpdate)
                fprintf(stderr, "Header with wrong dumpdate.\n");
        /*
         * If we're restoring a filesystem with the old (FreeBSD 1)
         * format inodes, copy the uid/gid to the new location
         */
        if (oldinofmt) {
                buf->c_uid = buf->c_spare1[1];
                buf->c_gid = buf->c_spare1[2];
        }
        buf->c_magic = FS_UFS2_MAGIC;
        tapeaddr = buf->c_tapea;
        if (dflag)
                accthdr(buf);
        return(GOOD);
}

/*
 * Check that a header is where it belongs and predict the next header
 */
static void
accthdr(struct s_spcl *header)
{
        static ino_t previno = 0x7fffffff;
        static int prevtype;
        static long predict;
        long blks, i;

        if (header->c_type == TS_TAPE) {
                fprintf(stderr, "Volume header ");
                if (header->c_firstrec)
                        fprintf(stderr, "begins with record %jd",
                            (intmax_t)header->c_firstrec);
                fprintf(stderr, "\n");
                previno = 0x7fffffff;
                return;
        }
        if (previno == 0x7fffffff)
                goto newcalc;
        switch (prevtype) {
        case TS_BITS:
                fprintf(stderr, "Dumped inodes map header");
                break;
        case TS_CLRI:
                fprintf(stderr, "Used inodes map header");
                break;
        case TS_INODE:
                fprintf(stderr, "File header, ino %ju", (uintmax_t)previno);
                break;
        case TS_ADDR:
                fprintf(stderr, "File continuation header, ino %ju",
                    (uintmax_t)previno);
                break;
        case TS_END:
                fprintf(stderr, "End of tape header");
                break;
        }
        if (predict != blksread - 1)
                fprintf(stderr, "; predicted %ld blocks, got %ld blocks",
                        predict, blksread - 1);
        fprintf(stderr, "\n");
newcalc:
        blks = 0;
        if (header->c_type != TS_END)
                for (i = 0; i < header->c_count; i++)
                        if (readmapflag || header->c_addr[i] != 0)
                                blks++;
        predict = blks;
        blksread = 0;
        prevtype = header->c_type;
        previno = header->c_inumber;
}

/*
 * Find an inode header.
 * Complain if had to skip.
 */
static void
findinode(struct s_spcl *header)
{
        static long skipcnt = 0;
        long i;
        char buf[TP_BSIZE];
        int htype;

        curfile.name = "<name unknown>";
        curfile.action = UNKNOWN;
        curfile.mode = 0;
        curfile.ino = 0;
        do {
                htype = header->c_type;
                switch (htype) {

                case TS_ADDR:
                        /*
                         * Skip up to the beginning of the next record
                         */
                        for (i = 0; i < header->c_count; i++)
                                if (header->c_addr[i])
                                        readtape(buf);
                        while (gethead(header) == FAIL ||
                            _time64_to_time(header->c_date) != dumpdate) {
                                skipcnt++;
                                if (Dflag) {
                                        byteslide++;
                                        if (byteslide < TP_BSIZE) {
                                                blkcnt--;
                                                blksread--;
                                        } else 
                                                byteslide = 0;
                                }
                        }
                        break;

                case TS_INODE:
                        curfile.mode = header->c_mode;
                        curfile.uid = header->c_uid;
                        curfile.gid = header->c_gid;
                        curfile.file_flags = header->c_file_flags;
                        curfile.rdev = header->c_rdev;
                        curfile.atime_sec = header->c_atime;
                        curfile.atime_nsec = header->c_atimensec;
                        curfile.mtime_sec = header->c_mtime;
                        curfile.mtime_nsec = header->c_mtimensec;
                        curfile.birthtime_sec = header->c_birthtime;
                        curfile.birthtime_nsec = header->c_birthtimensec;
                        curfile.extsize = header->c_extsize;
                        curfile.size = header->c_size;
                        curfile.ino = header->c_inumber;
                        break;

                case TS_END:
                        /* If we missed some tapes, get another volume. */
                        if (tapesread & (tapesread + 1)) {
                                getvol(0);
                                continue;
                        }
                        curfile.ino = maxino;
                        break;

                case TS_CLRI:
                        curfile.name = "<file removal list>";
                        break;

                case TS_BITS:
                        curfile.name = "<file dump list>";
                        break;

                case TS_TAPE:
                        if (Dflag)
                                fprintf(stderr, "unexpected tape header\n");
                        else
                                panic("unexpected tape header\n");

                default:
                        if (Dflag)
                                fprintf(stderr, "unknown tape header type %d\n",
                                    spcl.c_type);
                        else
                                panic("unknown tape header type %d\n",
                                    spcl.c_type);
                        while (gethead(header) == FAIL ||
                            _time64_to_time(header->c_date) != dumpdate) {
                                skipcnt++;
                                if (Dflag) {
                                        byteslide++;
                                        if (byteslide < TP_BSIZE) {
                                                blkcnt--;
                                                blksread--;
                                        } else 
                                                byteslide = 0;
                                }
                        }

                }
        } while (htype == TS_ADDR);
        if (skipcnt > 0)
                fprintf(stderr, "resync restore, skipped %ld %s\n",
                    skipcnt, Dflag ? "bytes" : "blocks");
        skipcnt = 0;
}

static int
checksum(int *buf)
{
        int i, j;

        j = sizeof(union u_spcl) / sizeof(int);
        i = 0;
        if (!Bcvt) {
                do
                        i += *buf++;
                while (--j);
        } else {
                /* What happens if we want to read restore tapes
                        for a 16bit int machine??? */
                do
                        i += swabl(*buf++);
                while (--j);
        }

        if (i != CHECKSUM) {
                fprintf(stderr, "Checksum error %o, inode %ju file %s\n", i,
                    (uintmax_t)curfile.ino, curfile.name);
                return(FAIL);
        }
        return(GOOD);
}

#ifdef RRESTORE
#include <stdarg.h>

void
msg(const char *fmt, ...)
{
        va_list ap;
        va_start(ap, fmt);
        (void)vfprintf(stderr, fmt, ap);
        va_end(ap);
}
#endif /* RRESTORE */

static u_char *
swabshort(u_char *sp, int n)
{
        char c;

        while (--n >= 0) {
                c = sp[0]; sp[0] = sp[1]; sp[1] = c;
                sp += 2;
        }
        return (sp);
}

static u_char *
swablong(u_char *sp, int n)
{
        char c;

        while (--n >= 0) {
                c = sp[0]; sp[0] = sp[3]; sp[3] = c;
                c = sp[2]; sp[2] = sp[1]; sp[1] = c;
                sp += 4;
        }
        return (sp);
}

static u_char *
swabquad(u_char *sp, int n)
{
        char c;

        while (--n >= 0) {
                c = sp[0]; sp[0] = sp[7]; sp[7] = c;
                c = sp[1]; sp[1] = sp[6]; sp[6] = c;
                c = sp[2]; sp[2] = sp[5]; sp[5] = c;
                c = sp[3]; sp[3] = sp[4]; sp[4] = c;
                sp += 8;
        }
        return (sp);
}

void
swabst(u_char *cp, u_char *sp)
{
        int n = 0;

        while (*cp) {
                switch (*cp) {
                case '0': case '1': case '2': case '3': case '4':
                case '5': case '6': case '7': case '8': case '9':
                        n = (n * 10) + (*cp++ - '0');
                        continue;

                case 's': case 'w': case 'h':
                        if (n == 0)
                                n = 1;
                        sp = swabshort(sp, n);
                        break;

                case 'l':
                        if (n == 0)
                                n = 1;
                        sp = swablong(sp, n);
                        break;

                case 'q':
                        if (n == 0)
                                n = 1;
                        sp = swabquad(sp, n);
                        break;

                case 'b':
                        if (n == 0)
                                n = 1;
                        sp += n;
                        break;

                default:
                        fprintf(stderr, "Unknown conversion character: %c\n",
                            *cp);
                        done(0);
                        break;
                }
                cp++;
                n = 0;
        }
}

static u_long
swabl(u_long x)
{
        swabst((u_char *)"l", (u_char *)&x);
        return (x);
}