update to version 2 in new fs

[unix-history] / usr / src / sbin / restore / main.c

/* Copyright (c) 1981 Regents of the University of California */

char version[] = "@(#)main.c 2.1 %G%";

/*      Modified to include h option (recursively extract all files within
*      a subtree) and m option (recreate the heirarchical structure of
*      that subtree and move extracted files to their proper homes).
*      8/29/80         by Mike Litzkow
*
*      Includes the s (skip files) option for use with multiple dumps on
*      a single tape.
*/

/* static char *sccsid = "@(#)restor.c  4.3 (Berkeley) 6/3/81"; */

#define MAXINO  3000
#define BITS    8
#define NCACHE  3
#define SIZEINC 10

#ifndef STANDALONE
#include <stdio.h>
#include <signal.h>
#endif
#include <sys/param.h>
#include <sys/inode.h>
#include <sys/fs.h>
#include <sys/buf.h>
#include <sys/ndir.h>
#include <sys/user.h>
#include <dumprestor.h>
#include <sys/mtio.h>

#define ODIRSIZ 14
struct odirect {
       u_short d_ino;
       char    d_name[ODIRSIZ];
};

#define MWORD(m,i) (m[(unsigned)(i-1)/NBBY])
#define MBIT(i) (1<<((unsigned)(i-1)%NBBY))
#define BIS(i,w)        (MWORD(w,i) |=  MBIT(i))
#define BIC(i,w)        (MWORD(w,i) &= ~MBIT(i))
#define BIT(i,w)        (MWORD(w,i) & MBIT(i))

ino_t   ino, maxi;
struct inode *cur_ip;

int     eflag = 0, hflag = 0, mflag = 0, cvtdir = 0;

extern  long mounted;
dev_t   dev = 0;
struct fs *fsptr;
struct inode parentino;
char    tapename[] = "/dev/rmt8";
char    *magtape = tapename;
int     mt;
int     dumpnum = 1;
int     volno = 1;
int     curblk = 0;
int     bct = NTREC+1;
char    tbf[NTREC*TP_BSIZE];

#ifdef STANDALONE
char    mbuf[50];
#endif

daddr_t seekpt;
FILE    *df;
DIR     *dirp;
int     ofile;
char    dirfile[] = "rstXXXXXX";
char    lnkbuf[MAXPATHLEN + 1];
int     pathlen;

#define INOHASH(val) (val % MAXINO)
struct inotab {
       struct inotab *t_next;
       ino_t   t_ino;
       daddr_t t_seekpt;
} *inotab[MAXINO];

#define XISDIR  1
#define XTRACTD 2
#define XINUSE  4
#define XLINKED 8
struct xtrlist {
       struct xtrlist  *x_next;
       struct xtrlist  *x_linkedto;
       time_t          x_timep[2];
       ino_t           x_ino;
       char            x_flags;
       char            x_name[1];
       /* actually longer */
} *xtrlist[MAXINO];
int xtrcnt = 0;

#ifdef STANDALONE
#define msiz 8192
char    dumpmap[msiz];
char    clrimap[msiz];
#else
int     msiz;
char    *dumpmap;
char    *clrimap;
#endif

char    clearedbuf[MAXBSIZE];

extern char *ctime();
ino_t search();
int dirwrite();
char **envp;

main(argc, argv, arge)
       int argc;
       char *argv[];
       char **arge;
{
       register char *cp;
       char command;
       int (*signal())();
       int done();

       if (signal(SIGINT, done) == SIG_IGN)
               signal(SIGINT, SIG_IGN);
       if (signal(SIGTERM, done) == SIG_IGN)
               signal(SIGTERM, SIG_IGN);
#ifndef STANDALONE
       envp = arge;
       mktmp(dirfile);
       if (argc < 2) {
usage:
               fprintf(stderr, "Usage: restor x[s|m|h|v] file file..., restor r|R filesys, or restor t\n");
               done(1);
       }
       argv++;
       argc -= 2;
       for (cp = *argv++; *cp; cp++) {
               switch (*cp) {
               case '-':
                       break;
               case 'f':
                       magtape = *argv++;
                       argc--;
                       break;
               /* s dumpnum (skip to) for multifile dump tapes */
               case 's':
                       dumpnum = atoi(*argv++);
                       if(dumpnum <= 0) {
                               fprintf(stderr, "Dump number must be a positive integer\n");
                               done(1);
                       }
                       argc--;
                       break;
               case 'h':
                       hflag++;
                       break;
               case 'm':
                       mflag++;
                       break;
               case 'r':
               case 'R':
               case 't':
               case 'x':
                       command = *cp;
                       break;
               default:
                       fprintf(stderr, "Bad key character %c\n", *cp);
                       goto usage;
               }
       }
       if (command == 'x') {
               df = fopen(dirfile, "w");
               if (df == 0) {
                       fprintf(stderr, "restor: %s - cannot create directory temporary\n", dirfile);
                       done(1);
               }
               mounted++;
               xmount(envp);
       }
       doit(command, argc, argv);
       done(0);
#else
       magtape = "tape";
       doit('r', 1, 0);
#endif
}

doit(command, argc, argv)
       char    command;
       int     argc;
       char    *argv[]; 
{
       struct mtop tcom;

#ifndef STANDALONE
       if ((mt = open(magtape, 0)) < 0) {
               fprintf(stderr, "%s: cannot open tape\n", magtape);
               done(1);
       }
       if (dumpnum != 1) {
               tcom.mt_op = MTFSF;
               tcom.mt_count = dumpnum -1;
               if (ioctl(mt,MTIOCTOP,&tcom) < 0)
                       perror("ioctl MTFSF");
       }
#else
       do {
               fprintf(stderr, "Tape? ");
               gets(mbuf);
               mt = open(mbuf, 0);
       } while (mt == -1);
       magtape = mbuf;
#endif
       blkclr(clearedbuf, MAXBSIZE);
       switch(command) {
#ifndef STANDALONE
       case 't':
               if (readhdr(&spcl) == 0) {
                       fprintf(stderr, "Tape is not a dump tape\n");
                       done(1);
               }
               fprintf(stdout, "Dump   date: %s", ctime(&spcl.c_date));
               fprintf(stdout, "Dumped from: %s", ctime(&spcl.c_ddate));
               return;
       case 'x':
               extractfiles(argc, argv);
               return;
#endif
       case 'r':
       case 'R':
               restorfiles(command, argv);
               return;
       }
}

#ifndef STANDALONE
extractfiles(argc, argv)
       int argc;
       char **argv;
{
       char    *ststore();
       register struct xtrlist *xp;
       struct xtrlist **xpp;
       ino_t   d;
       int     xtrfile(), xtrskip(), xtrcvtdir(), xtrcvtskip(),
               xtrlnkfile(), xtrlnkskip(), null();
       int     mode, uid, gid;
       char    name[BUFSIZ + 1];

       if (readhdr(&spcl) == 0) {
               fprintf(stderr, "Tape is not a dump tape\n");
               done(1);
       }
       if (checkvol(&spcl, 1) == 0) {
               fprintf(stderr, "Tape is not volume 1 of the dump\n");
       }
       fsptr = getfs(dev);
       msiz = roundup(howmany(fsptr->fs_ipg * fsptr->fs_ncg, NBBY), TP_BSIZE);
       clrimap = (char *)calloc(msiz, sizeof(char));
       dumpmap = (char *)calloc(msiz, sizeof(char));
       pass1(1);  /* This sets the various maps on the way by */
       while (argc--) {
               if ((d = psearch(*argv)) == 0 || BIT(d,dumpmap) == 0) {
                       fprintf(stdout, "%s: not on tape\n", *argv++);
                       continue;
               }
               if (mflag)
                       checkdir(*argv);
               if(hflag)
                       getleaves(d, *argv++);
               else
                       allocxtr(d, *argv++, XINUSE);
       }
       if (dumpnum > 1) {
               /*
                * if this is a multi-dump tape we always start with 
                * volume 1, so as to avoid accidentally restoring
                * from a different dump!
                */
               resetmt();
               dumpnum = 1;
               volno = 1;
               readhdr(&spcl);
               goto rbits;
       }
newvol:
       resetmt();
getvol:
       fprintf(stderr, "Mount desired tape volume; Specify volume #: ");
       if (gets(tbf) == NULL)
               return;
       volno = atoi(tbf);
       if (volno <= 0) {
               fprintf(stderr, "Volume numbers are positive numerics\n");
               goto getvol;
       }
       if (readhdr(&spcl) == 0) {
               fprintf(stderr, "tape is not dump tape\n");
               goto newvol;
       }
       if (checkvol(&spcl, volno) == 0) {
               fprintf(stderr, "Wrong volume (%d)\n", spcl.c_volume);
               goto newvol;
       }
rbits:
       while (gethead(&spcl) == 0)
               ;
       if (checktype(&spcl, TS_INODE) == 1) {
               fprintf(stderr, "Can't find inode mask!\n");
               goto newvol;
       }
       if (checktype(&spcl, TS_BITS) == 0)
               goto rbits;
       readbits(dumpmap);
       while (xtrcnt > 0) {
again:
               if (ishead(&spcl) == 0)
                       while(gethead(&spcl) == 0)
                               ;
               if (checktype(&spcl, TS_END) == 1) {
                       fprintf(stderr, "end of tape\n");
                       break;
               }
               if (checktype(&spcl, TS_INODE) == 0) {
                       gethead(&spcl);
                       goto again;
               }
               d = spcl.c_inumber;
               for (xp = xtrlist[INOHASH(d)]; xp; xp = xp->x_next) {
                       if (d != xp->x_ino)
                               continue;
                       if (xp->x_flags & XLINKED)
                               continue;
                       xp->x_timep[0] = spcl.c_dinode.di_atime;
                       xp->x_timep[1] = spcl.c_dinode.di_mtime;
                       mode = spcl.c_dinode.di_mode;
                       if (mflag)
                               strcpy(name, xp->x_name);
                       else
                               sprintf(name, "%u", xp->x_ino);
                       switch (mode & IFMT) {
                       default:
                               fprintf(stderr, "%s: unknown file type\n", name);
                               xp->x_flags |= XTRACTD;
                               xtrcnt--;
                               goto skipfile;
                       case IFCHR:
                       case IFBLK:
                               fprintf(stdout, "extract special file %s\n", name);
                               if (xmknod(name, mode, spcl.c_dinode.di_rdev)) {
                                       fprintf(stderr, "%s: cannot create special file\n", name);
                                       xp->x_flags |= XTRACTD;
                                       xtrcnt--;
                                       goto skipfile;
                               }
                               getfile(null, null, spcl.c_dinode.di_size);
                               break;
                       case IFDIR:
                               if (mflag) {
                                       fprintf(stdout, "extract directory %s\n", name);
                                       strncat(name, "/.", BUFSIZ);
                                       checkdir(name);
                                       xchown(xp->x_name, spcl.c_dinode.di_uid, spcl.c_dinode.di_gid);
                                       getfile(null, null, spcl.c_dinode.di_size);
                                       break;
                               }
                               fprintf(stdout, "extract file %s\n", name);
                               if ((ofile = xcreat(name, 0666)) < 0) {
                                       fprintf(stderr, "%s: cannot create file\n", name);
                                       xp->x_flags |= XTRACTD;
                                       xtrcnt--;
                                       goto skipfile;
                               }
                               xchown(name, spcl.c_dinode.di_uid, spcl.c_dinode.di_gid);
                               if (cvtdir) {
                                       getfile(xtrcvtdir, xtrcvtskip,
                                           spcl.c_dinode.di_size);
                                       flushent(xtrfile);
                               } else
                                       getfile(xtrfile, xtrskip,
                                           spcl.c_dinode.di_size);
                               xclose(ofile);
                               break;
                       case IFLNK:
                               fprintf(stdout, "extract symbolic link %s\n", name);
                               uid = spcl.c_dinode.di_uid;
                               gid = spcl.c_dinode.di_gid;
                               lnkbuf[0] = '\0';
                               pathlen = 0;
                               getfile(xtrlnkfile, xtrlnkskip, spcl.c_dinode.di_size);
                               if (xsymlink(lnkbuf, name) < 0) {
                                       fprintf(stderr, "%s: cannot create symbolic link\n", name);
                                       xp->x_flags |= XTRACTD;
                                       xtrcnt--;
                                       goto finished;
                               }
                               xchown(name, uid, gid);
                               break;
                       case IFREG:
                               fprintf(stdout, "extract file %s\n", name);
                               if ((ofile = xcreat(name, 0666)) < 0) {
                                       fprintf(stderr, "%s: cannot create file\n", name);
                                       xp->x_flags |= XTRACTD;
                                       xtrcnt--;
                                       goto skipfile;
                               }
                               xchown(name, spcl.c_dinode.di_uid, spcl.c_dinode.di_gid);
                               getfile(xtrfile, xtrskip, spcl.c_dinode.di_size);
                               xclose(ofile);
                               break;
                       }
                       xchmod(name, mode);
                       xutime(name, xp->x_timep);
                       xp->x_flags |= XTRACTD;
                       xtrcnt--;
                       goto finished;
               }
skipfile:
               getfile(null, null, spcl.c_dinode.di_size);
finished:
               ;
       }
       if (xtrcnt == 0 && !mflag)
               return;
       for (xpp = xtrlist; xpp < &xtrlist[MAXINO]; xpp++) {
               for (xp = *xpp; xp; xp = xp->x_next) {
                       if (mflag && (xp->x_flags & XISDIR))
                               xutime(xp->x_name, xp->x_timep);
                       if (xp->x_flags & XTRACTD)
                               continue;
                       if ((xp->x_flags & XLINKED) == 0) {
                               fprintf(stderr, "cannot find file %s\n",
                                       xp->x_name);
                               continue;
                       }
                       if (!mflag)
                               continue;
                       fprintf(stdout, "link %s to %s\n",
                               xp->x_linkedto->x_name, xp->x_name);
                       if (xlink(xp->x_linkedto->x_name, xp->x_name) < 0)
                               fprintf(stderr, "link %s to %s failed\n",
                                       xp->x_linkedto->x_name, xp->x_name);
               }
       }
}
#endif

restorfiles(command, argv)
       char command;
       char **argv;
{
       int null(), rstrfile(), rstrskip(), rstrcvtdir(), rstrcvtskip();
       register struct dinode *dp;
       register struct inode *ip;
       int mode, type;
       char mount[BUFSIZ + 1];
       char *ptr[2];

       mount[0] = '\0';
       strcpy(mount, "MOUNT=");
#ifndef STANDALONE
       strncat(mount, *argv, BUFSIZ);
#else
       fprintf(stderr, "Disk? ");
       gets(&mount[6]);
#endif
       ptr[0] = mount;
       ptr[1] = 0;
       mounted++;
       xmount(ptr);
       iput(u.u_cdir); /* release root inode */
       iput(u.u_rdir); /* release root inode */
       fsptr = getfs(dev);
       parentino.i_fs = fsptr;
       parentino.i_dev = dev;
       maxi = fsptr->fs_ipg * fsptr->fs_ncg;
#ifndef STANDALONE
       msiz = roundup(howmany(maxi, NBBY), TP_BSIZE);
       clrimap = (char *)calloc(msiz, sizeof(char));
       dumpmap = (char *)calloc(msiz, sizeof(char));
       if (command == 'R') {
               fprintf(stderr, "Enter starting volume number: ");
               if (gets(tbf) == EOF) {
                       volno = 1;
                       fprintf(stderr, "\n");
               }
               else
                       volno = atoi(tbf);
       }
       else
#endif
               volno = 1;
       fprintf(stderr, "Last chance before scribbling on %s. ",
#ifdef STANDALONE
                                                       "disk");
#else
                                                       *argv);
#endif
       while (getchar() != '\n');
       if (readhdr(&spcl) == 0) {
               fprintf(stderr, "Missing volume record\n");
               done(1);
       }
       if (checkvol(&spcl, volno) == 0) {
               fprintf(stderr, "Tape is not volume %d\n", volno);
               done(1);
       }
       pass1(0);
       gethead(&spcl); /* volume header already checked above */
       gethead(&spcl);
       for (;;) {
               if (ishead(&spcl) == 0) {
                       fprintf(stderr, "Missing header block\n");
                       while (gethead(&spcl) == 0)
                               ;
                       eflag++;
               }
               if (checktype(&spcl, TS_END) == 1) {
                       fprintf(stderr, "End of tape\n");
                       close(mt);
                       return;
               }
               if (checktype(&spcl, TS_CLRI) == 1) {
                       readbits(clrimap);
                       /*
                        * if throwing away the root inode, must also
                        * discard the predefined lost+found directory.
                        */
                       if (BIT(ROOTINO, clrimap))
                               BIS(LOSTFOUNDINO + 1, clrimap);
                       for (ino = ROOTINO; ino <= maxi; ino++)
                               if (BIT(ino, clrimap) == 0) {
                                       if (!iexist(&parentino, ino))
                                               continue;
                                       ip = iget(dev, fsptr, ino);
                                       if (ip == NULL) {
                                               fprintf(stderr, "can't find inode %u\n", ino);
                                               done(1);
                                       }
                                       ip->i_nlink = 0;
                                       ip->i_flag |= ICHG;
                                       iput(ip);
                               }
                       continue;
               }
               if (checktype(&spcl, TS_BITS) == 1) {
                       readbits(dumpmap);
                       continue;
               }
               if (checktype(&spcl, TS_INODE) == 0) {
                       fprintf(stderr, "Unknown header type\n");
                       eflag++;
                       gethead(&spcl);
                       continue;
               }
               ino = spcl.c_inumber;
               if (eflag)
                       fprintf(stderr, "Resynced at inode %u\n", ino);
               eflag = 0;
               if (ino > maxi) {
                       fprintf(stderr, "%u: ilist too small\n", ino);
                       gethead(&spcl);
                       continue;
               }
               dp = &spcl.c_dinode;
               if (ino < ROOTINO) {
                       getfile(null, null, dp->di_size);
                       continue;
               }
               if (iexist(&parentino, ino)) {
                       ip = iget(dev, fsptr, ino);
                       if (ip == NULL) {
                               fprintf(stderr, "can't find inode %u\n",
                                       ino);
                               done(1);
                       }
                       ip->i_nlink = 0;
                       ip->i_flag |= ICHG;
                       iput(ip);
               }
               ip = ialloc(&parentino, ino, dp->di_mode);
               if (ip == NULL || ip->i_number != ino) {
                       fprintf(stderr, "can't create inode %u\n", ino);
                       done(1);
               }
               ip->i_mode = mode = dp->di_mode;
               ip->i_nlink = dp->di_nlink;
               ip->i_uid = dp->di_uid;
               ip->i_gid = dp->di_gid;
               ip->i_atime = dp->di_atime;
               ip->i_mtime = dp->di_mtime;
               ip->i_ctime = dp->di_ctime;
               type = ip->i_mode & IFMT;
               if (type == IFCHR || type == IFBLK)
                       ip->i_rdev = dp->di_rdev;
               ip->i_size = 0;
               cur_ip = ip;
               u.u_offset = 0;
               u.u_segflg = 1;
               if (cvtdir && type == IFDIR) {
                       getfile(rstrcvtdir, rstrcvtskip, dp->di_size);
                       flushent(rstrfile);
               } else
                       getfile(rstrfile, rstrskip, dp->di_size);
               ip->i_mode = mode;
               ip->i_flag &= ~(IUPD|IACC);
               ip->i_flag |= ICHG;
               iput(ip);
       }
}

/*
* Read the tape, bulding up a directory structure for extraction
* by name
*/
#ifndef STANDALONE
pass1(savedir)
       int savedir;
{
       register int i;
       register struct dinode *ip;
       struct direct nulldir;
       char buf[TP_BSIZE];
       int putdir(), null(), dirwrite();

       nulldir.d_ino = 1;
       nulldir.d_namlen = 1;
       strncpy(nulldir.d_name, "/", nulldir.d_namlen);
       nulldir.d_reclen = DIRSIZ(&nulldir);
       while (gethead(&spcl) == 0) {
               fprintf(stderr, "Can't find directory header!\n");
       }
       for (;;) {
               if (checktype(&spcl, TS_BITS) == 1) {
                       readbits(dumpmap);
                       continue;
               }
               if (checktype(&spcl, TS_CLRI) == 1) {
                       readbits(clrimap);
                       continue;
               }
               if (checktype(&spcl, TS_INODE) == 0) {
finish:
                       if (savedir) {
                               fclose(df);
                               dirp = opendir(dirfile);
                               if (dirp == NULL)
                                       perror("opendir");
                       }
                       resetmt();
                       return;
               }
               ip = &spcl.c_dinode;
               i = ip->di_mode & IFMT;
               if (i != IFDIR) {
                       goto finish;
               }
               if (spcl.c_inumber == ROOTINO) {
                       readtape(buf);
                       bct--; /* push back this block */
                       if (((struct direct *)buf)->d_ino != ROOTINO) {
                               if (((struct odirect *)buf)->d_ino != ROOTINO) {
                                       fprintf(stderr, "bad root directory\n");
                                       done(1);
                               }
                               fprintf(stderr, "converting to new directory format\n");
                               cvtdir = 1;
                       }
                       if (!savedir && !cvtdir) {
                               /* if no conversion, just return */
                               goto finish;
                       }
               }
               allocinotab(spcl.c_inumber, seekpt);
               if (savedir) {
                       getfile(putdir, null, spcl.c_dinode.di_size);
                       putent(&nulldir, dirwrite);
                       flushent(dirwrite);
               } else {
                       getfile(null, null, spcl.c_dinode.di_size);
               }
       }
}
#endif

/*
* Put the directory entries in the directory file
*/
#ifndef STANDALONE
putdir(buf, size)
       char *buf;
       int size;
{
       struct direct cvtbuf;
       register struct odirect *odp;
       struct odirect *eodp;
       register struct direct *dp;
       long loc, i;

       if (cvtdir) {
               eodp = (struct odirect *)&buf[size];
               for (odp = (struct odirect *)buf; odp < eodp; odp++)
                       if (odp->d_ino != 0) {
                               dcvt(odp, &cvtbuf);
                               putent(&cvtbuf, dirwrite);
                       }
       } else {
               for (loc = 0; loc < size; ) {
                       dp = (struct direct *)(buf + loc);
                       i = DIRBLKSIZ - (loc & (DIRBLKSIZ - 1));
                       if (dp->d_reclen <= 0 || dp->d_reclen > i) {
                               loc += i;
                               continue;
                       }
                       loc += dp->d_reclen;
                       if (dp->d_ino != 0)
                               putent(dp, dirwrite);
               }
       }
}

/*
*      Recursively find names and inumbers of all files in subtree 
*      pname and put them in xtrlist[]
*/
getleaves(ino, pname)
       ino_t ino;
       char *pname;
{
       register struct inotab *itp;
       int namelen;
       long bpt;
       register struct direct *dp;
       char locname[BUFSIZ + 1];

       if (BIT(ino, dumpmap) == 0) {
               fprintf(stdout, "%s: not on the tape\n", pname);
               return;
       }
       for (itp = inotab[INOHASH(ino)]; itp; itp = itp->t_next) {
               if (itp->t_ino != ino)
                       continue;
               /*
                * pname is a directory name 
                */
               allocxtr(ino, pname, XISDIR);
               /*
                * begin search through the directory
                * skipping over "." and ".."
                */
               strncpy(locname, pname, BUFSIZ);
               strncat(locname, "/", BUFSIZ);
               namelen = strlen(locname);
               seekdir(dirp, itp->t_seekpt, itp->t_seekpt);
               dp = readdir(dirp);
               dp = readdir(dirp);
               dp = readdir(dirp);
               bpt = telldir(dirp);
               /*
                * "/" signals end of directory
                */
               while (dp->d_namlen != 1 || dp->d_name[0] != '/') {
                       locname[namelen] = '\0';
                       if (namelen + dp->d_namlen >= BUFSIZ) {
                               fprintf(stderr, "%s%s: name exceedes %d char\n",
                                       locname, dp->d_name, BUFSIZ);
                               continue;
                       }
                       strncat(locname, dp->d_name, dp->d_namlen);
                       getleaves(dp->d_ino, locname);
                       seekdir(dirp, bpt, itp->t_seekpt);
                       dp = readdir(dirp);
                       bpt = telldir(dirp);
               }
               return;
       }
       /*
        * locname is name of a simple file 
        */
       allocxtr(ino, pname, XINUSE);
}

/*
* Search the directory tree rooted at inode ROOTINO
* for the path pointed at by n
*/
psearch(n)
       char    *n;
{
       register char *cp, *cp1;
       char c;

       ino = ROOTINO;
       if (*(cp = n) == '/')
               cp++;
next:
       cp1 = cp + 1;
       while (*cp1 != '/' && *cp1)
               cp1++;
       c = *cp1;
       *cp1 = 0;
       ino = search(ino, cp);
       if (ino == 0) {
               *cp1 = c;
               return(0);
       }
       *cp1 = c;
       if (c == '/') {
               cp = cp1+1;
               goto next;
       }
       return(ino);
}

/*
* search the directory inode ino
* looking for entry cp
*/
ino_t
search(inum, cp)
       ino_t   inum;
       char    *cp;
{
       register struct direct *dp;
       register struct inotab *itp;
       int len;

       for (itp = inotab[INOHASH(inum)]; itp; itp = itp->t_next)
               if (itp->t_ino == inum)
                       goto found;
       return(0);
found:
       seekdir(dirp, itp->t_seekpt, itp->t_seekpt);
       len = strlen(cp);
       do {
               dp = readdir(dirp);
               if (dp->d_namlen == 1 && dp->d_name[0] == '/')
                       return(0);
       } while (dp->d_namlen != len || strncmp(dp->d_name, cp, len));
       return(dp->d_ino);
}
#endif

/*
* Do the file extraction, calling the supplied functions
* with the blocks
*/
getfile(f1, f2, size)
       int     (*f2)(), (*f1)();
       long    size;
{
       register int i;
       char buf[MAXBSIZE / TP_BSIZE][TP_BSIZE];
       union u_spcl addrblk;
#       define addrblock addrblk.s_spcl

       addrblock = spcl;
       for (;;) {
               for (i = 0; i < addrblock.c_count; i++) {
                       if (addrblock.c_addr[i]) {
                               readtape(&buf[curblk++][0]);
                               if (curblk == BLKING(fsptr) * fsptr->fs_frag) {
                                       (*f1)(buf, size > TP_BSIZE ?
                                            (long) (BLKING(fsptr) * fsptr->fs_frag * TP_BSIZE) :
                                            (curblk - 1) * TP_BSIZE + size);
                                       curblk = 0;
                               }
                       } else {
                               if (curblk > 0) {
                                       (*f1)(buf, size > TP_BSIZE ?
                                            (long) (curblk * TP_BSIZE) :
                                            (curblk - 1) * TP_BSIZE + size);
                                       curblk = 0;
                               }
                               (*f2)(clearedbuf, size > TP_BSIZE ?
                                       (long) TP_BSIZE : size);
                       }
                       if ((size -= TP_BSIZE) <= 0) {
eloop:
                               while (gethead(&spcl) == 0)
                                       ;
                               if (checktype(&spcl, TS_ADDR) == 1)
                                       goto eloop;
                               goto out;
                       }
               }
               if (gethead(&addrblock) == 0) {
                       fprintf(stderr, "Missing address (header) block, ino%u\n", ino);
                       goto eloop;
               }
               if (checktype(&addrblock, TS_ADDR) == 0) {
                       spcl = addrblock;
                       goto out;
               }
       }
out:
       if (curblk > 0) {
               (*f1)(buf, (curblk * TP_BSIZE) + size);
               curblk = 0;
       }
}

/*
* The next routines are called during file extraction to
* put the data into the right form and place.
*/
#ifndef STANDALONE
xtrfile(buf, size)
       char    *buf;
       long    size;
{
       if (xwrite(ofile, buf, (int) size) == -1) {
               perror("extract write");
               done(1);
       }
}

xtrskip(buf, size)
       char *buf;
       long size;
{
       if (xseek(ofile, size, 1) == -1) {
               perror("extract seek");
               done(1);
       }
}

xtrcvtdir(buf, size)
       struct odirect *buf;
       long size;
{
       struct odirect *odp, *edp;
       struct direct *dp, cvtbuf;

       edp = &buf[size / sizeof(struct odirect)];
       for (odp = buf; odp < edp; odp++) {
               dcvt(odp, &cvtbuf);
               putent(&cvtbuf, xtrfile);
       }
}

xtrcvtskip(buf, size)
       char *buf;
       long size;
{
       fprintf(stderr, "unallocated block in directory\n");
       xtrskip(buf, size);
}

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

xtrlnkskip(buf, size)
       char *buf;
       long size;
{
       fprintf(stderr, "unallocated block in symbolic link\n");
       done(1);
}
#endif

rstrfile(buf, size)
       char *buf;
       long size;
{
       u.u_base = buf;
       u.u_count = size;
       writei(cur_ip);
       if (u.u_error) {
               perror("restor write");
               done(1);
       }
}

rstrskip(buf, size)
       char *buf;
       long size;
{
       u.u_offset += size;
}

rstrcvtdir(buf, size)
       struct odirect *buf;
       long size;
{
       struct odirect *odp, *edp;
       struct direct *dp, cvtbuf;

       edp = &buf[size / sizeof(struct odirect)];
       for (odp = buf; odp < edp; odp++) {
               dcvt(odp, &cvtbuf);
               putent(&cvtbuf, rstrfile);
       }
}

rstrcvtskip(buf, size)
       char *buf;
       long size;
{
       fprintf(stderr, "unallocated block in directory\n");
       rstrskip(buf, size);
}

null() {;}

/*
* Do the tape i/o, dealing with volume changes
* etc..
*/
readtape(b)
       char *b;
{
       register int i;
       struct s_spcl tmpbuf;

       if (bct >= NTREC) {
               for (i = 0; i < NTREC; i++)
                       ((struct s_spcl *)&tbf[i*TP_BSIZE])->c_magic = 0;
               bct = 0;
               if ((i = read(mt, tbf, NTREC*TP_BSIZE)) < 0) {
                       perror("Tape read error");
                       eflag++;
                       done(1);
               }
               if (i == 0) {
                       bct = NTREC + 1;
                       volno++;
loop:
                       flsht();
                       close(mt);
                       fprintf(stderr, "Mount volume %d\n", volno);
                       while (getchar() != '\n')
                               ;
                       if ((mt = open(magtape, 0)) == -1) {
                               fprintf(stderr, "Cannot open tape!\n");
                               goto loop;
                       }
                       if (readhdr(&tmpbuf) == 0) {
                               fprintf(stderr, "Not a dump tape.Try again\n");
                               goto loop;
                       }
                       if (checkvol(&tmpbuf, volno) == 0) {
                               fprintf(stderr, "Wrong tape. Try again\n");
                               goto loop;
                       }
                       readtape(b);
                       return;
               }
       }
       blkcpy(&tbf[(bct++*TP_BSIZE)], b, TP_BSIZE);
}

flsht()
{
       bct = NTREC+1;
}

blkcpy(from, to, size)
       char *from, *to;
       int size;
{
       asm("   movc3   12(ap),*4(ap),*8(ap)");
}

blkclr(buf, size)
       char *buf;
       int size;
{
       asm("movc5      $0,(r0),$0,8(ap),*4(ap)");
}

resetmt()
{
       struct mtop tcom;

       if(dumpnum > 1)
               tcom.mt_op = MTBSF;
       else
               tcom.mt_op = MTREW;
       tcom.mt_count = 1;
       flsht();
       if (ioctl(mt,MTIOCTOP,&tcom) == -1) {
               /* kludge for disk dumps */
               lseek(mt, (long)0, 0);
       }
       if (dumpnum > 1) {
               tcom.mt_op = MTFSF;
               tcom.mt_count = 1;
               ioctl(mt,MTIOCTOP,&tcom);
       }
}

checkvol(b, t)
       struct s_spcl *b;
       int t;
{
       if (b->c_volume == t)
               return(1);
       return(0);
}

readhdr(b)
       struct s_spcl *b;
{
       if (gethead(b) == 0)
               return(0);
       if (checktype(b, TS_TAPE) == 0)
               return(0);
       return(1);
}

/*
* read the tape into buf, then return whether or
* or not it is a header block.
*/
gethead(buf)
       struct s_spcl *buf;
{
       readtape((char *)buf);
       if (buf->c_magic != MAGIC || checksum((int *)buf) == 0)
               return(0);
       return(1);
}

/*
* return whether or not the buffer contains a header block
*/
ishead(buf)
       struct s_spcl *buf;
{
       if (buf->c_magic != MAGIC || checksum((int *)buf) == 0)
               return(0);
       return(1);
}

checktype(b, t)
       struct s_spcl *b;
       int     t;
{
       return(b->c_type == t);
}

/*
* read a bit mask from the tape into m.
*/
readbits(m)
       char    *m;
{
       register int i;

       i = spcl.c_count;

       while (i--) {
               readtape((char *) m);
               m += (TP_BSIZE/(NBBY/BITS));
       }
       while (gethead(&spcl) == 0)
               ;
}

checksum(b)
       int *b;
{
       register int i, j;

       j = sizeof(union u_spcl) / sizeof(int);
       i = 0;
       do
               i += *b++;
       while (--j);
       if (i != CHECKSUM) {
               fprintf(stderr, "Checksum error %o, ino %u\n", i, ino);
               return(0);
       }
       return(1);
}

/*
*      Check for access into each directory in the pathname of an extracted
*      file and create such a directory if needed in preparation for moving 
*      the file to its proper home.
*/
checkdir(name)
       register char *name;
{
       register char *cp;
       int i;

       for (cp = name; *cp; cp++) {
               if (*cp == '/') {
                       *cp = '\0';
                       if (xaccess(name, 01) < 0) {
                               register int pid, rp;

                               xumount();
                               mounted = 0;
                               if ((pid = fork()) == 0) {
                                       execl("/bin/xmkdir", "xmkdir", name, 0);
                                       execl("/usr/bin/xmkdir", "xmkdir", name, 0);
                                       execl("./xmkdir", "xmkdir", name, 0);
                                       fprintf(stderr, "xrestor: cannot find xmkdir!\n");
                                       done(0);
                               }
                               while ((rp = wait(&i)) >= 0 && rp != pid)
                                       ;
                               mounted++;
                               xmount(envp);
                               fsptr = getfs(dev);
                               parentino.i_fs = fsptr;
                       }
                       *cp = '/';
               }
       }
}

/*
* These variables are "local" to the following two functions.
*/
char dirbuf[DIRBLKSIZ];
long dirloc = 0;
long prev = 0;

/*
* add a new directory entry to a file.
*/
putent(dp, wrtfunc)
       struct direct *dp;
       int (*wrtfunc)();
{
       if (dp->d_ino == 0)
               return;
       for (;;) {
               if (dp->d_reclen < DIRBLKSIZ - dirloc) {
                       blkcpy(dp, dirbuf + dirloc, dp->d_reclen);
                       prev = dirloc;
                       dirloc += dp->d_reclen;
                       return;
               }
               ((struct direct *)(dirbuf + prev))->d_reclen = DIRBLKSIZ - prev;
               (*wrtfunc)(dirbuf, DIRBLKSIZ);
               dirloc = 0;
       }
}

/*
* flush out a directory that is finished.
*/
flushent(wrtfunc)
       int (*wrtfunc)();
{
       ((struct direct *)(dirbuf + prev))->d_reclen = DIRBLKSIZ - prev;
       (*wrtfunc)(dirbuf, dirloc);
       dirloc = 0;
}

dirwrite(buf, size)
       char *buf;
       int size;
{
       fwrite(buf, 1, size, df);
       seekpt = ftell(df);
}

dcvt(odp, ndp)
       register struct odirect *odp;
       register struct direct *ndp;
{
       struct inotab *itp;

       blkclr(ndp, sizeof *ndp);
       ndp->d_ino =  odp->d_ino;
       strncpy(ndp->d_name, odp->d_name, ODIRSIZ);
       ndp->d_namlen = strlen(ndp->d_name);
       ndp->d_reclen = DIRSIZ(ndp);
       /*
        * this quickly calculates if this inode is a directory.
        * Currently not maintained.
        *
       for (itp = inotab[INOHASH(odp->d_ino)]; itp; itp = itp->t_next) {
               if (itp->t_ino != odp->d_ino)
                       continue;
               ndp->d_fmt = IFDIR;
               break;
       }
        */
}

/*
* Open a directory.
* Modified to allow any random file to be a legal directory.
*/
DIR *
opendir(name)
       char *name;
{
       register DIR *dirp;

       dirp = (DIR *)malloc(sizeof(DIR));
       dirp->dd_fd = open(name, 0);
       if (dirp->dd_fd == -1) {
               free(dirp);
               return NULL;
       }
       dirp->dd_loc = 0;
       return dirp;
}

/*
* Seek to an entry in a directory.
* Only values returned by ``telldir'' should be passed to seekdir.
* Modified to have many directories based in one file.
*/
void
seekdir(dirp, loc, base)
       register DIR *dirp;
       long loc, base;
{
       if (loc == telldir(dirp))
               return;
       loc -= base;
       if (loc < 0)
               fprintf(stderr, "bad seek pointer to seekdir %d\n", loc);
       lseek(dirp->dd_fd, base + (loc & ~(DIRBLKSIZ - 1)), 0);
       dirp->dd_loc = loc & (DIRBLKSIZ - 1);
       if (dirp->dd_loc != 0)
               dirp->dd_size = read(dirp->dd_fd, dirp->dd_buf, DIRBLKSIZ);
}

/*
* tell whether an inode is allocated
* this is drawn from ialloccg in sys/alloc.c
*/
iexist(ip, ino)
       struct inode *ip;
       ino_t ino;
{
       register struct fs *fs;
       register struct cg *cgp;
       register struct buf *bp;
       int cg;

       fs = ip->i_fs;
       if ((unsigned)ino >= fs->fs_ipg*fs->fs_ncg)
               return (0);
       cg = itog(fs, ino);
       bp = bread(ip->i_dev, fsbtodb(fs, cgtod(fs, cg)), fs->fs_bsize);
       if (bp->b_flags & B_ERROR) {
               brelse(bp);
               return(0);
       }
       cgp = bp->b_un.b_cg;
       ino %= fs->fs_ipg;
       if (isclr(cgp->cg_iused, ino)) {
               brelse(bp);
               return(0);
       }
       brelse(bp);
       return (1);
}

allocinotab(ino, seekpt)
       ino_t ino;
       daddr_t seekpt;
{
       register struct inotab  *itp;

       itp = (struct inotab *)calloc(1, sizeof(struct inotab));
       itp->t_next = inotab[INOHASH(ino)];
       inotab[INOHASH(ino)] = itp;
       itp->t_ino = ino;
       itp->t_seekpt = seekpt;
}

allocxtr(ino, name, flags)
       ino_t ino;
       char *name;
       char flags;
{
       register struct xtrlist *xp, *pxp;

       xp = (struct xtrlist *)calloc(1, sizeof(struct xtrlist) + strlen(name));
       xp->x_next = xtrlist[INOHASH(ino)];
       xtrlist[INOHASH(ino)] = xp;
       xp->x_ino = ino;
       strcpy(xp->x_name, name);
       xtrcnt++;
       xp->x_flags = flags;
       for (pxp = xp->x_next; pxp; pxp = pxp->x_next)
               if (pxp->x_ino == ino && (pxp->x_flags & XLINKED) == 0) {
                       xp->x_flags |= XLINKED;
                       xp->x_linkedto = pxp;
                       xtrcnt--;
                       break;
               }
       if (xp->x_flags & XLINKED)
               fprintf(stdout, "%s: linked to %s\n", xp->x_name, pxp->x_name);
       else if (xp->x_flags & XISDIR)
               fprintf(stdout, "%s: directory inode %u\n", xp->x_name, ino);
       else
               fprintf(stdout, "%s: inode %u\n", xp->x_name, ino);
}

done(exitcode)
       int exitcode;
{
#ifndef STANDALONE
       unlink(dirfile);
#endif
       if (mounted) {
               xumount();
               mounted = 0;
       }
       exit(exitcode);
}