sbin/fsck_msdosfs/dir.c

   1 /*
   2  * Copyright (C) 1995, 1996, 1997 Wolfgang Solfrank
   3  * Copyright (c) 1995 Martin Husemann
   4  * Some structure declaration borrowed from Paul Popelka
   5  * (paulp@uts.amdahl.com), see /sys/msdosfs/ for reference.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. All advertising materials mentioning features or use of this software
  16  *    must display the following acknowledgement:
  17  *      This product includes software developed by Martin Husemann
  18  *      and Wolfgang Solfrank.
  19  * 4. Neither the name of the University nor the names of its contributors
  20  *    may be used to endorse or promote products derived from this software
  21  *    without specific prior written permission.
  22  *
  23  * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
  24  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  25  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  26  * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
  27  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  28  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  29  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  30  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  31  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  32  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  33  *
  34  * $NetBSD: dir.c,v 1.14 1998/08/25 19:18:15 ross Exp $
  35  * $FreeBSD: src/sbin/fsck_msdosfs/dir.c,v 1.1.2.1 2001/08/01 05:47:55 obrien Exp $
  36  */
  37
  38
  39 #include <sys/cdefs.h>
  40
  41 #include <stdio.h>
  42 #include <stdlib.h>
  43 #include <string.h>
  44 #include <ctype.h>
  45 #include <unistd.h>
  46 #include <time.h>
  47
  48 #include <sys/param.h>
  49
  50 #include "ext.h"
  51 #include "fsutil.h"
  52
  53 #define SLOT_EMPTY      0x00            /* slot has never been used */
  54 #define SLOT_E5         0x05            /* the real value is 0xe5 */
  55 #define SLOT_DELETED    0xe5            /* file in this slot deleted */
  56
  57 #define ATTR_NORMAL     0x00            /* normal file */
  58 #define ATTR_READONLY   0x01            /* file is readonly */
  59 #define ATTR_HIDDEN     0x02            /* file is hidden */
  60 #define ATTR_SYSTEM     0x04            /* file is a system file */
  61 #define ATTR_VOLUME     0x08            /* entry is a volume label */
  62 #define ATTR_DIRECTORY  0x10            /* entry is a directory name */
  63 #define ATTR_ARCHIVE    0x20            /* file is new or modified */
  64
  65 #define ATTR_WIN95      0x0f            /* long name record */
  66
  67 /*
  68  * This is the format of the contents of the deTime field in the direntry
  69  * structure.
  70  * We don't use bitfields because we don't know how compilers for
  71  * arbitrary machines will lay them out.
  72  */
  73 #define DT_2SECONDS_MASK        0x1F    /* seconds divided by 2 */
  74 #define DT_2SECONDS_SHIFT       0
  75 #define DT_MINUTES_MASK         0x7E0   /* minutes */
  76 #define DT_MINUTES_SHIFT        5
  77 #define DT_HOURS_MASK           0xF800  /* hours */
  78 #define DT_HOURS_SHIFT          11
  79
  80 /*
  81  * This is the format of the contents of the deDate field in the direntry
  82  * structure.
  83  */
  84 #define DD_DAY_MASK             0x1F    /* day of month */
  85 #define DD_DAY_SHIFT            0
  86 #define DD_MONTH_MASK           0x1E0   /* month */
  87 #define DD_MONTH_SHIFT          5
  88 #define DD_YEAR_MASK            0xFE00  /* year - 1980 */
  89 #define DD_YEAR_SHIFT           9
  90
  91
  92 /* dir.c */
  93 static struct dosDirEntry *newDosDirEntry(void);
  94 static void freeDosDirEntry(struct dosDirEntry *);
  95 static struct dirTodoNode *newDirTodo(void);
  96 static void freeDirTodo(struct dirTodoNode *);
  97 static char *fullpath(struct dosDirEntry *);
  98 static u_char calcShortSum(u_char *);
  99 static int delete(int, struct bootblock *, struct fatEntry *, cl_t, int,
 100     cl_t, int, int);
 101 static int removede(int, struct bootblock *, struct fatEntry *, u_char *,
 102     u_char *, cl_t, cl_t, cl_t, char *, int);
 103 static int checksize(struct bootblock *, struct fatEntry *, u_char *,
 104     struct dosDirEntry *);
 105 static int readDosDirSection(int, struct bootblock *, struct fatEntry *,
 106     struct dosDirEntry *);
 107
 108 /*
 109  * Manage free dosDirEntry structures.
 110  */
 111 static struct dosDirEntry *freede;
 112
 113 static struct dosDirEntry *
 114 newDosDirEntry(void)
 115 {
 116         struct dosDirEntry *de;
 117
 118         if (!(de = freede)) {
 119                 if (!(de = (struct dosDirEntry *)malloc(sizeof *de)))
 120                         return 0;
 121         } else
 122                 freede = de->next;
 123         return de;
 124 }
 125
 126 static void
 127 freeDosDirEntry(struct dosDirEntry *de)
 128 {
 129         de->next = freede;
 130         freede = de;
 131 }
 132
 133 /*
 134  * The same for dirTodoNode structures.
 135  */
 136 static struct dirTodoNode *freedt;
 137
 138 static struct dirTodoNode *
 139 newDirTodo(void)
 140 {
 141         struct dirTodoNode *dt;
 142
 143         if (!(dt = freedt)) {
 144                 if (!(dt = (struct dirTodoNode *)malloc(sizeof *dt)))
 145                         return 0;
 146         } else
 147                 freedt = dt->next;
 148         return dt;
 149 }
 150
 151 static void
 152 freeDirTodo(struct dirTodoNode *dt)
 153 {
 154         dt->next = freedt;
 155         freedt = dt;
 156 }
 157
 158 /*
 159  * The stack of unread directories
 160  */
 161 struct dirTodoNode *pendingDirectories = NULL;
 162
 163 /*
 164  * Return the full pathname for a directory entry.
 165  */
 166 static char *
 167 fullpath(struct dosDirEntry *dir)
 168 {
 169         static char namebuf[MAXPATHLEN + 1];
 170         char *cp, *np;
 171         int nl;
 172
 173         cp = namebuf + sizeof namebuf - 1;
 174         *cp = '\0';
 175         do {
 176                 np = dir->lname[0] ? dir->lname : dir->name;
 177                 nl = strlen(np);
 178                 if ((cp -= nl) <= namebuf + 1)
 179                         break;
 180                 memcpy(cp, np, nl);
 181                 *--cp = '/';
 182         } while ((dir = dir->parent) != NULL);
 183         if (dir)
 184                 *--cp = '?';
 185         else
 186                 cp++;
 187         return cp;
 188 }
 189
 190 /*
 191  * Calculate a checksum over an 8.3 alias name
 192  */
 193 static u_char
 194 calcShortSum(u_char *p)
 195 {
 196         u_char sum = 0;
 197         int i;
 198
 199         for (i = 0; i < 11; i++) {
 200                 sum = (sum << 7)|(sum >> 1);    /* rotate right */
 201                 sum += p[i];
 202         }
 203
 204         return sum;
 205 }
 206
 207 /*
 208  * Global variables temporarily used during a directory scan
 209  */
 210 static char longName[DOSLONGNAMELEN] = "";
 211 static u_char *buffer = NULL;
 212 static u_char *delbuf = NULL;
 213
 214 struct dosDirEntry *rootDir;
 215 static struct dosDirEntry *lostDir;
 216
 217 /*
 218  * Init internal state for a new directory scan.
 219  */
 220 int
 221 resetDosDirSection(struct bootblock *boot, struct fatEntry *fat)
 222 {
 223         int b1, b2;
 224         cl_t cl;
 225         int ret = FSOK;
 226
 227         b1 = boot->RootDirEnts * 32;
 228         b2 = boot->SecPerClust * boot->BytesPerSec;
 229
 230         if (!(buffer = malloc(b1 > b2 ? b1 : b2))
 231             || !(delbuf = malloc(b2))
 232             || !(rootDir = newDosDirEntry())) {
 233                 perror("No space for directory");
 234                 return FSFATAL;
 235         }
 236         memset(rootDir, 0, sizeof *rootDir);
 237         if (boot->flags & FAT32) {
 238                 if (boot->RootCl < CLUST_FIRST || boot->RootCl >= boot->NumClusters) {
 239                         pfatal("Root directory starts with cluster out of range(%u)",
 240                                boot->RootCl);
 241                         return FSFATAL;
 242                 }
 243                 cl = fat[boot->RootCl].next;
 244                 if (cl < CLUST_FIRST
 245                     || (cl >= CLUST_RSRVD && cl< CLUST_EOFS)
 246                     || fat[boot->RootCl].head != boot->RootCl) {
 247                         if (cl == CLUST_FREE)
 248                                 pwarn("Root directory starts with free cluster\n");
 249                         else if (cl >= CLUST_RSRVD)
 250                                 pwarn("Root directory starts with cluster marked %s\n",
 251                                       rsrvdcltype(cl));
 252                         else {
 253                                 pfatal("Root directory doesn't start a cluster chain");
 254                                 return FSFATAL;
 255                         }
 256                         if (ask(1, "Fix")) {
 257                                 fat[boot->RootCl].next = CLUST_FREE;
 258                                 ret = FSFATMOD;
 259                         } else
 260                                 ret = FSFATAL;
 261                 }
 262
 263                 fat[boot->RootCl].flags |= FAT_USED;
 264                 rootDir->head = boot->RootCl;
 265         }
 266
 267         return ret;
 268 }
 269
 270 /*
 271  * Cleanup after a directory scan
 272  */
 273 void
 274 finishDosDirSection(void)
 275 {
 276         struct dirTodoNode *p, *np;
 277         struct dosDirEntry *d, *nd;
 278
 279         for (p = pendingDirectories; p; p = np) {
 280                 np = p->next;
 281                 freeDirTodo(p);
 282         }
 283         pendingDirectories = NULL;
 284         for (d = rootDir; d; d = nd) {
 285                 if ((nd = d->child) != NULL) {
 286                         d->child = 0;
 287                         continue;
 288                 }
 289                 if (!(nd = d->next))
 290                         nd = d->parent;
 291                 freeDosDirEntry(d);
 292         }
 293         rootDir = lostDir = NULL;
 294         free(buffer);
 295         free(delbuf);
 296         buffer = NULL;
 297         delbuf = NULL;
 298 }
 299
 300 /*
 301  * Delete directory entries between startcl, startoff and endcl, endoff.
 302  */
 303 static int
 304 delete(int f, struct bootblock *boot, struct fatEntry *fat, cl_t startcl,
 305        int startoff, cl_t endcl, int endoff, int notlast)
 306 {
 307         u_char *s, *e;
 308         off_t off;
 309         int clsz = boot->SecPerClust * boot->BytesPerSec;
 310
 311         s = delbuf + startoff;
 312         e = delbuf + clsz;
 313         while (startcl >= CLUST_FIRST && startcl < boot->NumClusters) {
 314                 if (startcl == endcl) {
 315                         if (notlast)
 316                                 break;
 317                         e = delbuf + endoff;
 318                 }
 319                 off = startcl * boot->SecPerClust + boot->ClusterOffset;
 320                 off *= boot->BytesPerSec;
 321                 if (lseek(f, off, SEEK_SET) != off
 322                     || read(f, delbuf, clsz) != clsz) {
 323                         perror("Unable to read directory");
 324                         return FSFATAL;
 325                 }
 326                 while (s < e) {
 327                         *s = SLOT_DELETED;
 328                         s += 32;
 329                 }
 330                 if (lseek(f, off, SEEK_SET) != off
 331                     || write(f, delbuf, clsz) != clsz) {
 332                         perror("Unable to write directory");
 333                         return FSFATAL;
 334                 }
 335                 if (startcl == endcl)
 336                         break;
 337                 startcl = fat[startcl].next;
 338                 s = delbuf;
 339         }
 340         return FSOK;
 341 }
 342
 343 static int
 344 removede(int f, struct bootblock *boot, struct fatEntry *fat, u_char *start,
 345          u_char *end, cl_t startcl, cl_t endcl, cl_t curcl, char *path,
 346          int type)
 347 {
 348         switch (type) {
 349         case 0:
 350                 pwarn("Invalid long filename entry for %s\n", path);
 351                 break;
 352         case 1:
 353                 pwarn("Invalid long filename entry at end of directory %s\n", path);
 354                 break;
 355         case 2:
 356                 pwarn("Invalid long filename entry for volume label\n");
 357                 break;
 358         }
 359         if (ask(0, "Remove")) {
 360                 if (startcl != curcl) {
 361                         if (delete(f, boot, fat,
 362                                    startcl, start - buffer,
 363                                    endcl, end - buffer,
 364                                    endcl == curcl) == FSFATAL)
 365                                 return FSFATAL;
 366                         start = buffer;
 367                 }
 368                 if (endcl == curcl)
 369                         for (; start < end; start += 32)
 370                                 *start = SLOT_DELETED;
 371                 return FSDIRMOD;
 372         }
 373         return FSERROR;
 374 }
 375
 376 /*
 377  * Check an in-memory file entry
 378  */
 379 static int
 380 checksize(struct bootblock *boot, struct fatEntry *fat, u_char *p,
 381           struct dosDirEntry *dir)
 382 {
 383         /*
 384          * Check size on ordinary files
 385          */
 386         int32_t physicalSize;
 387
 388         if (dir->head == CLUST_FREE)
 389                 physicalSize = 0;
 390         else {
 391                 if (dir->head < CLUST_FIRST || dir->head >= boot->NumClusters)
 392                         return FSERROR;
 393                 physicalSize = fat[dir->head].length * boot->ClusterSize;
 394         }
 395         if (physicalSize < dir->size) {
 396                 pwarn("size of %s is %u, should at most be %u\n",
 397                       fullpath(dir), dir->size, physicalSize);
 398                 if (ask(1, "Truncate")) {
 399                         dir->size = physicalSize;
 400                         p[28] = (u_char)physicalSize;
 401                         p[29] = (u_char)(physicalSize >> 8);
 402                         p[30] = (u_char)(physicalSize >> 16);
 403                         p[31] = (u_char)(physicalSize >> 24);
 404                         return FSDIRMOD;
 405                 } else
 406                         return FSERROR;
 407         } else if (physicalSize - dir->size >= boot->ClusterSize) {
 408                 pwarn("%s has too many clusters allocated\n",
 409                       fullpath(dir));
 410                 if (ask(1, "Drop superfluous clusters")) {
 411                         cl_t cl;
 412                         u_int32_t sz = 0;
 413
 414                         for (cl = dir->head; (sz += boot->ClusterSize) < dir->size;)
 415                                 cl = fat[cl].next;
 416                         clearchain(boot, fat, fat[cl].next);
 417                         fat[cl].next = CLUST_EOF;
 418                         return FSFATMOD;
 419                 } else
 420                         return FSERROR;
 421         }
 422         return FSOK;
 423 }
 424
 425 /*
 426  * Read a directory and
 427  *   - resolve long name records
 428  *   - enter file and directory records into the parent's list
 429  *   - push directories onto the todo-stack
 430  */
 431 static int
 432 readDosDirSection(int f, struct bootblock *boot, struct fatEntry *fat,
 433                   struct dosDirEntry *dir)
 434 {
 435         struct dosDirEntry dirent, *d;
 436         u_char *p, *vallfn, *invlfn, *empty;
 437         off_t off;
 438         int i, j, k, last;
 439         cl_t cl, valcl = ~0, invcl = ~0, empcl = ~0;
 440         char *t;
 441         u_int lidx = 0;
 442         int shortSum;
 443         int mod = FSOK;
 444 #define THISMOD 0x8000                  /* Only used within this routine */
 445
 446         cl = dir->head;
 447         if (dir->parent && (cl < CLUST_FIRST || cl >= boot->NumClusters)) {
 448                 /*
 449                  * Already handled somewhere else.
 450                  */
 451                 return FSOK;
 452         }
 453         shortSum = -1;
 454         vallfn = invlfn = empty = NULL;
 455         do {
 456                 if (!(boot->flags & FAT32) && !dir->parent) {
 457                         last = boot->RootDirEnts * 32;
 458                         off = boot->ResSectors + boot->FATs * boot->FATsecs;
 459                 } else {
 460                         last = boot->SecPerClust * boot->BytesPerSec;
 461                         off = cl * boot->SecPerClust + boot->ClusterOffset;
 462                 }
 463
 464                 off *= boot->BytesPerSec;
 465                 if (lseek(f, off, SEEK_SET) != off
 466                     || read(f, buffer, last) != last) {
 467                         perror("Unable to read directory");
 468                         return FSFATAL;
 469                 }
 470                 last /= 32;
 471                 /*
 472                  * Check `.' and `..' entries here?                     XXX
 473                  */
 474                 for (p = buffer, i = 0; i < last; i++, p += 32) {
 475                         if (dir->fsckflags & DIREMPWARN) {
 476                                 *p = SLOT_EMPTY;
 477                                 continue;
 478                         }
 479
 480                         if (*p == SLOT_EMPTY || *p == SLOT_DELETED) {
 481                                 if (*p == SLOT_EMPTY) {
 482                                         dir->fsckflags |= DIREMPTY;
 483                                         empty = p;
 484                                         empcl = cl;
 485                                 }
 486                                 continue;
 487                         }
 488
 489                         if (dir->fsckflags & DIREMPTY) {
 490                                 if (!(dir->fsckflags & DIREMPWARN)) {
 491                                         pwarn("%s has entries after end of directory\n",
 492                                               fullpath(dir));
 493                                         if (ask(1, "Extend")) {
 494                                                 u_char *q;
 495
 496                                                 dir->fsckflags &= ~DIREMPTY;
 497                                                 if (delete(f, boot, fat,
 498                                                            empcl, empty - buffer,
 499                                                            cl, p - buffer, 1) == FSFATAL)
 500                                                         return FSFATAL;
 501                                                 q = empcl == cl ? empty : buffer;
 502                                                 for (; q < p; q += 32)
 503                                                         *q = SLOT_DELETED;
 504                                                 mod |= THISMOD|FSDIRMOD;
 505                                         } else if (ask(0, "Truncate"))
 506                                                 dir->fsckflags |= DIREMPWARN;
 507                                 }
 508                                 if (dir->fsckflags & DIREMPWARN) {
 509                                         *p = SLOT_DELETED;
 510                                         mod |= THISMOD|FSDIRMOD;
 511                                         continue;
 512                                 } else if (dir->fsckflags & DIREMPTY)
 513                                         mod |= FSERROR;
 514                                 empty = NULL;
 515                         }
 516
 517                         if (p[11] == ATTR_WIN95) {
 518                                 if (*p & LRFIRST) {
 519                                         if (shortSum != -1) {
 520                                                 if (!invlfn) {
 521                                                         invlfn = vallfn;
 522                                                         invcl = valcl;
 523                                                 }
 524                                         }
 525                                         memset(longName, 0, sizeof longName);
 526                                         shortSum = p[13];
 527                                         vallfn = p;
 528                                         valcl = cl;
 529                                 } else if (shortSum != p[13]
 530                                            || lidx != (*p & LRNOMASK)) {
 531                                         if (!invlfn) {
 532                                                 invlfn = vallfn;
 533                                                 invcl = valcl;
 534                                         }
 535                                         if (!invlfn) {
 536                                                 invlfn = p;
 537                                                 invcl = cl;
 538                                         }
 539                                         vallfn = NULL;
 540                                 }
 541                                 lidx = *p & LRNOMASK;
 542                                 t = longName + --lidx * 13;
 543                                 for (k = 1; k < 11 && t < longName + sizeof(longName); k += 2) {
 544                                         if (!p[k] && !p[k + 1])
 545                                                 break;
 546                                         *t++ = p[k];
 547                                         /*
 548                                          * Warn about those unusable chars in msdosfs here?     XXX
 549                                          */
 550                                         if (p[k + 1])
 551                                                 t[-1] = '?';
 552                                 }
 553                                 if (k >= 11)
 554                                         for (k = 14; k < 26 && t < longName + sizeof(longName); k += 2) {
 555                                                 if (!p[k] && !p[k + 1])
 556                                                         break;
 557                                                 *t++ = p[k];
 558                                                 if (p[k + 1])
 559                                                         t[-1] = '?';
 560                                         }
 561                                 if (k >= 26)
 562                                         for (k = 28; k < 32 && t < longName + sizeof(longName); k += 2) {
 563                                                 if (!p[k] && !p[k + 1])
 564                                                         break;
 565                                                 *t++ = p[k];
 566                                                 if (p[k + 1])
 567                                                         t[-1] = '?';
 568                                         }
 569                                 if (t >= longName + sizeof(longName)) {
 570                                         pwarn("long filename too long\n");
 571                                         if (!invlfn) {
 572                                                 invlfn = vallfn;
 573                                                 invcl = valcl;
 574                                         }
 575                                         vallfn = NULL;
 576                                 }
 577                                 if (p[26] | (p[27] << 8)) {
 578                                         pwarn("long filename record cluster start != 0\n");
 579                                         if (!invlfn) {
 580                                                 invlfn = vallfn;
 581                                                 invcl = cl;
 582                                         }
 583                                         vallfn = NULL;
 584                                 }
 585                                 continue;       /* long records don't carry further
 586                                                  * information */
 587                         }
 588
 589                         /*
 590                          * This is a standard msdosfs directory entry.
 591                          */
 592                         memset(&dirent, 0, sizeof dirent);
 593
 594                         /*
 595                          * it's a short name record, but we need to know
 596                          * more, so get the flags first.
 597                          */
 598                         dirent.flags = p[11];
 599
 600                         /*
 601                          * Translate from 850 to ISO here               XXX
 602                          */
 603                         for (j = 0; j < 8; j++)
 604                                 dirent.name[j] = p[j];
 605                         dirent.name[8] = '\0';
 606                         for (k = 7; k >= 0 && dirent.name[k] == ' '; k--)
 607                                 dirent.name[k] = '\0';
 608                         if (dirent.name[k] != '\0')
 609                                 k++;
 610                         if (dirent.name[0] == SLOT_E5)
 611                                 dirent.name[0] = 0xe5;
 612
 613                         if (dirent.flags & ATTR_VOLUME) {
 614                                 if (vallfn || invlfn) {
 615                                         mod |= removede(f, boot, fat,
 616                                                         invlfn ? invlfn : vallfn, p,
 617                                                         invlfn ? invcl : valcl, -1, 0,
 618                                                         fullpath(dir), 2);
 619                                         vallfn = NULL;
 620                                         invlfn = NULL;
 621                                 }
 622                                 continue;
 623                         }
 624
 625                         if (p[8] != ' ')
 626                                 dirent.name[k++] = '.';
 627                         for (j = 0; j < 3; j++)
 628                                 dirent.name[k++] = p[j+8];
 629                         dirent.name[k] = '\0';
 630                         for (k--; k >= 0 && dirent.name[k] == ' '; k--)
 631                                 dirent.name[k] = '\0';
 632
 633                         if (vallfn && shortSum != calcShortSum(p)) {
 634                                 if (!invlfn) {
 635                                         invlfn = vallfn;
 636                                         invcl = valcl;
 637                                 }
 638                                 vallfn = NULL;
 639                         }
 640                         dirent.head = p[26] | (p[27] << 8);
 641                         if (boot->ClustMask == CLUST32_MASK)
 642                                 dirent.head |= (p[20] << 16) | (p[21] << 24);
 643                         dirent.size = p[28] | (p[29] << 8) | (p[30] << 16) | (p[31] << 24);
 644                         if (vallfn) {
 645                                 strcpy(dirent.lname, longName);
 646                                 longName[0] = '\0';
 647                                 shortSum = -1;
 648                         }
 649
 650                         dirent.parent = dir;
 651                         dirent.next = dir->child;
 652
 653                         if (invlfn) {
 654                                 mod |= k = removede(f, boot, fat,
 655                                                     invlfn, vallfn ? vallfn : p,
 656                                                     invcl, vallfn ? valcl : cl, cl,
 657                                                     fullpath(&dirent), 0);
 658                                 if (mod & FSFATAL)
 659                                         return FSFATAL;
 660                                 if (vallfn
 661                                     ? (valcl == cl && vallfn != buffer)
 662                                     : p != buffer)
 663                                         if (k & FSDIRMOD)
 664                                                 mod |= THISMOD;
 665                         }
 666
 667                         vallfn = NULL; /* not used any longer */
 668                         invlfn = NULL;
 669
 670                         if (dirent.size == 0 && !(dirent.flags & ATTR_DIRECTORY)) {
 671                                 if (dirent.head != 0) {
 672                                         pwarn("%s has clusters, but size 0\n",
 673                                               fullpath(&dirent));
 674                                         if (ask(1, "Drop allocated clusters")) {
 675                                                 p[26] = p[27] = 0;
 676                                                 if (boot->ClustMask == CLUST32_MASK)
 677                                                         p[20] = p[21] = 0;
 678                                                 clearchain(boot, fat, dirent.head);
 679                                                 dirent.head = 0;
 680                                                 mod |= THISMOD|FSDIRMOD|FSFATMOD;
 681                                         } else
 682                                                 mod |= FSERROR;
 683                                 }
 684                         } else if (dirent.head == 0
 685                                    && !strcmp(dirent.name, "..")
 686                                    && dir->parent                       /* XXX */
 687                                    && !dir->parent->parent) {
 688                                 /*
 689                                  *  Do nothing, the parent is the root
 690                                  */
 691                         } else if (dirent.head < CLUST_FIRST
 692                                    || dirent.head >= boot->NumClusters
 693                                    || fat[dirent.head].next == CLUST_FREE
 694                                    || (fat[dirent.head].next >= CLUST_RSRVD
 695                                        && fat[dirent.head].next < CLUST_EOFS)
 696                                    || fat[dirent.head].head != dirent.head) {
 697                                 if (dirent.head == 0)
 698                                         pwarn("%s has no clusters\n",
 699                                               fullpath(&dirent));
 700                                 else if (dirent.head < CLUST_FIRST
 701                                          || dirent.head >= boot->NumClusters)
 702                                         pwarn("%s starts with cluster out of range(%u)\n",
 703                                               fullpath(&dirent),
 704                                               dirent.head);
 705                                 else if (fat[dirent.head].next == CLUST_FREE)
 706                                         pwarn("%s starts with free cluster\n",
 707                                               fullpath(&dirent));
 708                                 else if (fat[dirent.head].next >= CLUST_RSRVD)
 709                                         pwarn("%s starts with cluster marked %s\n",
 710                                               fullpath(&dirent),
 711                                               rsrvdcltype(fat[dirent.head].next));
 712                                 else
 713                                         pwarn("%s doesn't start a cluster chain\n",
 714                                               fullpath(&dirent));
 715                                 if (dirent.flags & ATTR_DIRECTORY) {
 716                                         if (ask(0, "Remove")) {
 717                                                 *p = SLOT_DELETED;
 718                                                 mod |= THISMOD|FSDIRMOD;
 719                                         } else
 720                                                 mod |= FSERROR;
 721                                         continue;
 722                                 } else {
 723                                         if (ask(1, "Truncate")) {
 724                                                 p[28] = p[29] = p[30] = p[31] = 0;
 725                                                 p[26] = p[27] = 0;
 726                                                 if (boot->ClustMask == CLUST32_MASK)
 727                                                         p[20] = p[21] = 0;
 728                                                 dirent.size = 0;
 729                                                 mod |= THISMOD|FSDIRMOD;
 730                                         } else
 731                                                 mod |= FSERROR;
 732                                 }
 733                         }
 734
 735                         if (dirent.head >= CLUST_FIRST && dirent.head < boot->NumClusters)
 736                                 fat[dirent.head].flags |= FAT_USED;
 737
 738                         if (dirent.flags & ATTR_DIRECTORY) {
 739                                 /*
 740                                  * gather more info for directories
 741                                  */
 742                                 struct dirTodoNode *n;
 743
 744                                 if (dirent.size) {
 745                                         pwarn("Directory %s has size != 0\n",
 746                                               fullpath(&dirent));
 747                                         if (ask(1, "Correct")) {
 748                                                 p[28] = p[29] = p[30] = p[31] = 0;
 749                                                 dirent.size = 0;
 750                                                 mod |= THISMOD|FSDIRMOD;
 751                                         } else
 752                                                 mod |= FSERROR;
 753                                 }
 754                                 /*
 755                                  * handle `.' and `..' specially
 756                                  */
 757                                 if (strcmp(dirent.name, ".") == 0) {
 758                                         if (dirent.head != dir->head) {
 759                                                 pwarn("`.' entry in %s has incorrect start cluster\n",
 760                                                       fullpath(dir));
 761                                                 if (ask(1, "Correct")) {
 762                                                         dirent.head = dir->head;
 763                                                         p[26] = (u_char)dirent.head;
 764                                                         p[27] = (u_char)(dirent.head >> 8);
 765                                                         if (boot->ClustMask == CLUST32_MASK) {
 766                                                                 p[20] = (u_char)(dirent.head >> 16);
 767                                                                 p[21] = (u_char)(dirent.head >> 24);
 768                                                         }
 769                                                         mod |= THISMOD|FSDIRMOD;
 770                                                 } else
 771                                                         mod |= FSERROR;
 772                                         }
 773                                         continue;
 774                                 }
 775                                 if (strcmp(dirent.name, "..") == 0) {
 776                                         if (dir->parent) {              /* XXX */
 777                                                 if (!dir->parent->parent) {
 778                                                         if (dirent.head) {
 779                                                                 pwarn("`..' entry in %s has non-zero start cluster\n",
 780                                                                       fullpath(dir));
 781                                                                 if (ask(1, "Correct")) {
 782                                                                         dirent.head = 0;
 783                                                                         p[26] = p[27] = 0;
 784                                                                         if (boot->ClustMask == CLUST32_MASK)
 785                                                                                 p[20] = p[21] = 0;
 786                                                                         mod |= THISMOD|FSDIRMOD;
 787                                                                 } else
 788                                                                         mod |= FSERROR;
 789                                                         }
 790                                                 } else if (dirent.head != dir->parent->head) {
 791                                                         pwarn("`..' entry in %s has incorrect start cluster\n",
 792                                                               fullpath(dir));
 793                                                         if (ask(1, "Correct")) {
 794                                                                 dirent.head = dir->parent->head;
 795                                                                 p[26] = (u_char)dirent.head;
 796                                                                 p[27] = (u_char)(dirent.head >> 8);
 797                                                                 if (boot->ClustMask == CLUST32_MASK) {
 798                                                                         p[20] = (u_char)(dirent.head >> 16);
 799                                                                         p[21] = (u_char)(dirent.head >> 24);
 800                                                                 }
 801                                                                 mod |= THISMOD|FSDIRMOD;
 802                                                         } else
 803                                                                 mod |= FSERROR;
 804                                                 }
 805                                         }
 806                                         continue;
 807                                 }
 808
 809                                 /* create directory tree node */
 810                                 if (!(d = newDosDirEntry())) {
 811                                         perror("No space for directory");
 812                                         return FSFATAL;
 813                                 }
 814                                 memcpy(d, &dirent, sizeof(struct dosDirEntry));
 815                                 /* link it into the tree */
 816                                 dir->child = d;
 817
 818                                 /* Enter this directory into the todo list */
 819                                 if (!(n = newDirTodo())) {
 820                                         perror("No space for todo list");
 821                                         return FSFATAL;
 822                                 }
 823                                 n->next = pendingDirectories;
 824                                 n->dir = d;
 825                                 pendingDirectories = n;
 826                         } else {
 827                                 mod |= k = checksize(boot, fat, p, &dirent);
 828                                 if (k & FSDIRMOD)
 829                                         mod |= THISMOD;
 830                         }
 831                         boot->NumFiles++;
 832                 }
 833                 if (mod & THISMOD) {
 834                         last *= 32;
 835                         if (lseek(f, off, SEEK_SET) != off
 836                             || write(f, buffer, last) != last) {
 837                                 perror("Unable to write directory");
 838                                 return FSFATAL;
 839                         }
 840                         mod &= ~THISMOD;
 841                 }
 842         } while ((cl = fat[cl].next) >= CLUST_FIRST && cl < boot->NumClusters);
 843         if (invlfn || vallfn)
 844                 mod |= removede(f, boot, fat,
 845                                 invlfn ? invlfn : vallfn, p,
 846                                 invlfn ? invcl : valcl, -1, 0,
 847                                 fullpath(dir), 1);
 848         return mod & ~THISMOD;
 849 }
 850
 851 int
 852 handleDirTree(int dosfs, struct bootblock *boot, struct fatEntry *fat)
 853 {
 854         int mod;
 855
 856         mod = readDosDirSection(dosfs, boot, fat, rootDir);
 857         if (mod & FSFATAL)
 858                 return FSFATAL;
 859
 860         /*
 861          * process the directory todo list
 862          */
 863         while (pendingDirectories) {
 864                 struct dosDirEntry *dir = pendingDirectories->dir;
 865                 struct dirTodoNode *n = pendingDirectories->next;
 866
 867                 /*
 868                  * remove TODO entry now, the list might change during
 869                  * directory reads
 870                  */
 871                 freeDirTodo(pendingDirectories);
 872                 pendingDirectories = n;
 873
 874                 /*
 875                  * handle subdirectory
 876                  */
 877                 mod |= readDosDirSection(dosfs, boot, fat, dir);
 878                 if (mod & FSFATAL)
 879                         return FSFATAL;
 880         }
 881
 882         return mod;
 883 }
 884
 885 /*
 886  * Try to reconnect a FAT chain into dir
 887  */
 888 static u_char *lfbuf;
 889 static cl_t lfcl;
 890 static off_t lfoff;
 891
 892 int
 893 reconnect(int dosfs, struct bootblock *boot, struct fatEntry *fat, cl_t head)
 894 {
 895         struct dosDirEntry d;
 896         u_char *p;
 897
 898         if (!ask(1, "Reconnect"))
 899                 return FSERROR;
 900
 901         if (!lostDir) {
 902                 for (lostDir = rootDir->child; lostDir; lostDir = lostDir->next) {
 903                         if (!strcmp(lostDir->name, LOSTDIR))
 904                                 break;
 905                 }
 906                 if (!lostDir) {         /* Create LOSTDIR?              XXX */
 907                         pwarn("No %s directory\n", LOSTDIR);
 908                         return FSERROR;
 909                 }
 910         }
 911         if (!lfbuf) {
 912                 lfbuf = malloc(boot->ClusterSize);
 913                 if (!lfbuf) {
 914                         perror("No space for buffer");
 915                         return FSFATAL;
 916                 }
 917                 p = NULL;
 918         } else
 919                 p = lfbuf;
 920         while (1) {
 921                 if (p)
 922                         for (; p < lfbuf + boot->ClusterSize; p += 32)
 923                                 if (*p == SLOT_EMPTY
 924                                     || *p == SLOT_DELETED)
 925                                         break;
 926                 if (p && p < lfbuf + boot->ClusterSize)
 927                         break;
 928                 lfcl = p ? fat[lfcl].next : lostDir->head;
 929                 if (lfcl < CLUST_FIRST || lfcl >= boot->NumClusters) {
 930                         /* Extend LOSTDIR?                              XXX */
 931                         pwarn("No space in %s\n", LOSTDIR);
 932                         return FSERROR;
 933                 }
 934                 lfoff = lfcl * boot->ClusterSize
 935                     + boot->ClusterOffset * boot->BytesPerSec;
 936                 if (lseek(dosfs, lfoff, SEEK_SET) != lfoff
 937                     || read(dosfs, lfbuf, boot->ClusterSize) != boot->ClusterSize) {
 938                         perror("could not read LOST.DIR");
 939                         return FSFATAL;
 940                 }
 941                 p = lfbuf;
 942         }
 943
 944         boot->NumFiles++;
 945         /* Ensure uniqueness of entry here!                             XXX */
 946         memset(&d, 0, sizeof d);
 947         snprintf(d.name, sizeof(d.name), "%u", head);
 948         d.flags = 0;
 949         d.head = head;
 950         d.size = fat[head].length * boot->ClusterSize;
 951
 952         memset(p, 0, 32);
 953         memset(p, ' ', 11);
 954         memcpy(p, d.name, strlen(d.name));
 955         p[26] = (u_char)d.head;
 956         p[27] = (u_char)(d.head >> 8);
 957         if (boot->ClustMask == CLUST32_MASK) {
 958                 p[20] = (u_char)(d.head >> 16);
 959                 p[21] = (u_char)(d.head >> 24);
 960         }
 961         p[28] = (u_char)d.size;
 962         p[29] = (u_char)(d.size >> 8);
 963         p[30] = (u_char)(d.size >> 16);
 964         p[31] = (u_char)(d.size >> 24);
 965         fat[head].flags |= FAT_USED;
 966         if (lseek(dosfs, lfoff, SEEK_SET) != lfoff
 967             || write(dosfs, lfbuf, boot->ClusterSize) != boot->ClusterSize) {
 968                 perror("could not write LOST.DIR");
 969                 return FSFATAL;
 970         }
 971         return FSDIRMOD;
 972 }
 973
 974 void
 975 finishlf(void)
 976 {
 977         if (lfbuf)
 978                 free(lfbuf);
 979         lfbuf = NULL;
 980 }