2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (C) 1995, 1996, 1997 Wolfgang Solfrank
5 * Copyright (c) 1995 Martin Husemann
6 * Some structure declaration borrowed from Paul Popelka
7 * (paulp@uts.amdahl.com), see /sys/msdosfs/ for reference.
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
12 * 1. Redistributions of source code must retain the above copyright
13 * notice, this list of conditions and the following disclaimer.
14 * 2. Redistributions in binary form must reproduce the above copyright
15 * notice, this list of conditions and the following disclaimer in the
16 * documentation and/or other materials provided with the distribution.
18 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS OR
19 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
20 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
21 * IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY DIRECT, INDIRECT,
22 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
23 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
24 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
25 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
26 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
27 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
31 #include <sys/cdefs.h>
33 __RCSID("$NetBSD: dir.c,v 1.20 2006/06/05 16:51:18 christos Exp $");
34 static const char rcsid[] =
47 #include <sys/param.h>
52 #define SLOT_EMPTY 0x00 /* slot has never been used */
53 #define SLOT_E5 0x05 /* the real value is 0xe5 */
54 #define SLOT_DELETED 0xe5 /* file in this slot deleted */
56 #define ATTR_NORMAL 0x00 /* normal file */
57 #define ATTR_READONLY 0x01 /* file is readonly */
58 #define ATTR_HIDDEN 0x02 /* file is hidden */
59 #define ATTR_SYSTEM 0x04 /* file is a system file */
60 #define ATTR_VOLUME 0x08 /* entry is a volume label */
61 #define ATTR_DIRECTORY 0x10 /* entry is a directory name */
62 #define ATTR_ARCHIVE 0x20 /* file is new or modified */
64 #define ATTR_WIN95 0x0f /* long name record */
67 * This is the format of the contents of the deTime field in the direntry
69 * We don't use bitfields because we don't know how compilers for
70 * arbitrary machines will lay them out.
72 #define DT_2SECONDS_MASK 0x1F /* seconds divided by 2 */
73 #define DT_2SECONDS_SHIFT 0
74 #define DT_MINUTES_MASK 0x7E0 /* minutes */
75 #define DT_MINUTES_SHIFT 5
76 #define DT_HOURS_MASK 0xF800 /* hours */
77 #define DT_HOURS_SHIFT 11
80 * This is the format of the contents of the deDate field in the direntry
83 #define DD_DAY_MASK 0x1F /* day of month */
84 #define DD_DAY_SHIFT 0
85 #define DD_MONTH_MASK 0x1E0 /* month */
86 #define DD_MONTH_SHIFT 5
87 #define DD_YEAR_MASK 0xFE00 /* year - 1980 */
88 #define DD_YEAR_SHIFT 9
92 static struct dosDirEntry *newDosDirEntry(void);
93 static void freeDosDirEntry(struct dosDirEntry *);
94 static struct dirTodoNode *newDirTodo(void);
95 static void freeDirTodo(struct dirTodoNode *);
96 static char *fullpath(struct dosDirEntry *);
97 static u_char calcShortSum(u_char *);
98 static int delete(int, struct bootblock *, struct fatEntry *, cl_t, int,
100 static int removede(int, struct bootblock *, struct fatEntry *, u_char *,
101 u_char *, cl_t, cl_t, cl_t, char *, int);
102 static int checksize(struct bootblock *, struct fatEntry *, u_char *,
103 struct dosDirEntry *);
104 static int readDosDirSection(int, struct bootblock *, struct fatEntry *,
105 struct dosDirEntry *);
108 * Manage free dosDirEntry structures.
110 static struct dosDirEntry *freede;
112 static struct dosDirEntry *
115 struct dosDirEntry *de;
117 if (!(de = freede)) {
118 if (!(de = malloc(sizeof *de)))
126 freeDosDirEntry(struct dosDirEntry *de)
133 * The same for dirTodoNode structures.
135 static struct dirTodoNode *freedt;
137 static struct dirTodoNode *
140 struct dirTodoNode *dt;
142 if (!(dt = freedt)) {
143 if (!(dt = malloc(sizeof *dt)))
151 freeDirTodo(struct dirTodoNode *dt)
158 * The stack of unread directories
160 static struct dirTodoNode *pendingDirectories = NULL;
163 * Return the full pathname for a directory entry.
166 fullpath(struct dosDirEntry *dir)
168 static char namebuf[MAXPATHLEN + 1];
172 cp = namebuf + sizeof namebuf - 1;
175 np = dir->lname[0] ? dir->lname : dir->name;
177 if ((cp -= nl) <= namebuf + 1)
181 } while ((dir = dir->parent) != NULL);
190 * Calculate a checksum over an 8.3 alias name
193 calcShortSum(u_char *p)
198 for (i = 0; i < 11; i++) {
199 sum = (sum << 7)|(sum >> 1); /* rotate right */
207 * Global variables temporarily used during a directory scan
209 static char longName[DOSLONGNAMELEN] = "";
210 static u_char *buffer = NULL;
211 static u_char *delbuf = NULL;
213 static struct dosDirEntry *rootDir;
214 static struct dosDirEntry *lostDir;
217 * Init internal state for a new directory scan.
220 resetDosDirSection(struct bootblock *boot, struct fatEntry *fat)
227 b1 = boot->bpbRootDirEnts * 32;
228 b2 = boot->bpbSecPerClust * boot->bpbBytesPerSec;
230 if ((buffer = malloc(len = MAX(b1, b2))) == NULL) {
231 perr("No space for directory buffer (%zu)", len);
235 if ((delbuf = malloc(len = b2)) == NULL) {
237 perr("No space for directory delbuf (%zu)", len);
241 if ((rootDir = newDosDirEntry()) == NULL) {
244 perr("No space for directory entry");
248 memset(rootDir, 0, sizeof *rootDir);
249 if (boot->flags & FAT32) {
250 if (boot->bpbRootClust < CLUST_FIRST ||
251 boot->bpbRootClust >= boot->NumClusters) {
252 pfatal("Root directory starts with cluster out of range(%u)",
256 cl = fat[boot->bpbRootClust].next;
258 || (cl >= CLUST_RSRVD && cl< CLUST_EOFS)
259 || fat[boot->bpbRootClust].head != boot->bpbRootClust) {
260 if (cl == CLUST_FREE)
261 pwarn("Root directory starts with free cluster\n");
262 else if (cl >= CLUST_RSRVD)
263 pwarn("Root directory starts with cluster marked %s\n",
266 pfatal("Root directory doesn't start a cluster chain");
270 fat[boot->bpbRootClust].next = CLUST_FREE;
276 fat[boot->bpbRootClust].flags |= FAT_USED;
277 rootDir->head = boot->bpbRootClust;
284 * Cleanup after a directory scan
287 finishDosDirSection(void)
289 struct dirTodoNode *p, *np;
290 struct dosDirEntry *d, *nd;
292 for (p = pendingDirectories; p; p = np) {
296 pendingDirectories = NULL;
297 for (d = rootDir; d; d = nd) {
298 if ((nd = d->child) != NULL) {
306 rootDir = lostDir = NULL;
314 * Delete directory entries between startcl, startoff and endcl, endoff.
317 delete(int f, struct bootblock *boot, struct fatEntry *fat, cl_t startcl,
318 int startoff, cl_t endcl, int endoff, int notlast)
322 int clsz = boot->bpbSecPerClust * boot->bpbBytesPerSec;
324 s = delbuf + startoff;
326 while (startcl >= CLUST_FIRST && startcl < boot->NumClusters) {
327 if (startcl == endcl) {
332 off = startcl * boot->bpbSecPerClust + boot->ClusterOffset;
333 off *= boot->bpbBytesPerSec;
334 if (lseek(f, off, SEEK_SET) != off) {
335 perr("Unable to lseek to %" PRId64, off);
338 if (read(f, delbuf, clsz) != clsz) {
339 perr("Unable to read directory");
346 if (lseek(f, off, SEEK_SET) != off) {
347 perr("Unable to lseek to %" PRId64, off);
350 if (write(f, delbuf, clsz) != clsz) {
351 perr("Unable to write directory");
354 if (startcl == endcl)
356 startcl = fat[startcl].next;
363 removede(int f, struct bootblock *boot, struct fatEntry *fat, u_char *start,
364 u_char *end, cl_t startcl, cl_t endcl, cl_t curcl, char *path, int type)
368 pwarn("Invalid long filename entry for %s\n", path);
371 pwarn("Invalid long filename entry at end of directory %s\n",
375 pwarn("Invalid long filename entry for volume label\n");
378 if (ask(0, "Remove")) {
379 if (startcl != curcl) {
380 if (delete(f, boot, fat,
381 startcl, start - buffer,
383 endcl == curcl) == FSFATAL)
387 /* startcl is < CLUST_FIRST for !fat32 root */
388 if ((endcl == curcl) || (startcl < CLUST_FIRST))
389 for (; start < end; start += 32)
390 *start = SLOT_DELETED;
397 * Check an in-memory file entry
400 checksize(struct bootblock *boot, struct fatEntry *fat, u_char *p,
401 struct dosDirEntry *dir)
404 * Check size on ordinary files
406 u_int32_t physicalSize;
408 if (dir->head == CLUST_FREE)
411 if (dir->head < CLUST_FIRST || dir->head >= boot->NumClusters)
413 physicalSize = fat[dir->head].length * boot->ClusterSize;
415 if (physicalSize < dir->size) {
416 pwarn("size of %s is %u, should at most be %u\n",
417 fullpath(dir), dir->size, physicalSize);
418 if (ask(1, "Truncate")) {
419 dir->size = physicalSize;
420 p[28] = (u_char)physicalSize;
421 p[29] = (u_char)(physicalSize >> 8);
422 p[30] = (u_char)(physicalSize >> 16);
423 p[31] = (u_char)(physicalSize >> 24);
427 } else if (physicalSize - dir->size >= boot->ClusterSize) {
428 pwarn("%s has too many clusters allocated\n",
430 if (ask(1, "Drop superfluous clusters")) {
434 for (cl = dir->head, len = sz = 0;
435 (sz += boot->ClusterSize) < dir->size; len++)
437 clearchain(boot, fat, fat[cl].next);
438 fat[cl].next = CLUST_EOF;
439 fat[dir->head].length = len;
447 static const u_char dot_name[11] = ". ";
448 static const u_char dotdot_name[11] = ".. ";
451 * Basic sanity check if the subdirectory have good '.' and '..' entries,
452 * and they are directory entries. Further sanity checks are performed
453 * when we traverse into it.
456 check_subdirectory(int f, struct bootblock *boot, struct dosDirEntry *dir)
464 if (dir->parent && (cl < CLUST_FIRST || cl >= boot->NumClusters)) {
468 if (!(boot->flags & FAT32) && !dir->parent) {
469 off = boot->bpbResSectors + boot->bpbFATs *
472 off = cl * boot->bpbSecPerClust + boot->ClusterOffset;
476 * We only need to check the first two entries of the directory,
477 * which is found in the first sector of the directory entry,
478 * so read in only the first sector.
480 buf = malloc(boot->bpbBytesPerSec);
482 perr("No space for directory buffer (%u)",
483 boot->bpbBytesPerSec);
487 off *= boot->bpbBytesPerSec;
488 if (lseek(f, off, SEEK_SET) != off ||
489 read(f, buf, boot->bpbBytesPerSec) != (ssize_t)boot->bpbBytesPerSec) {
490 perr("Unable to read directory");
496 * Both `.' and `..' must be present and be the first two entries
497 * and be ATTR_DIRECTORY of a valid subdirectory.
500 if (memcmp(cp, dot_name, sizeof(dot_name)) != 0 ||
501 (cp[11] & ATTR_DIRECTORY) != ATTR_DIRECTORY) {
502 pwarn("%s: Incorrect `.' for %s.\n", __func__, dir->name);
506 if (memcmp(cp, dotdot_name, sizeof(dotdot_name)) != 0 ||
507 (cp[11] & ATTR_DIRECTORY) != ATTR_DIRECTORY) {
508 pwarn("%s: Incorrect `..' for %s. \n", __func__, dir->name);
517 * Read a directory and
518 * - resolve long name records
519 * - enter file and directory records into the parent's list
520 * - push directories onto the todo-stack
523 readDosDirSection(int f, struct bootblock *boot, struct fatEntry *fat,
524 struct dosDirEntry *dir)
526 struct dosDirEntry dirent, *d;
527 u_char *p, *vallfn, *invlfn, *empty;
530 cl_t cl, valcl = ~0, invcl = ~0, empcl = ~0;
535 #define THISMOD 0x8000 /* Only used within this routine */
538 if (dir->parent && (cl < CLUST_FIRST || cl >= boot->NumClusters)) {
540 * Already handled somewhere else.
545 vallfn = invlfn = empty = NULL;
547 if (!(boot->flags & FAT32) && !dir->parent) {
548 last = boot->bpbRootDirEnts * 32;
549 off = boot->bpbResSectors + boot->bpbFATs *
552 last = boot->bpbSecPerClust * boot->bpbBytesPerSec;
553 off = cl * boot->bpbSecPerClust + boot->ClusterOffset;
556 off *= boot->bpbBytesPerSec;
557 if (lseek(f, off, SEEK_SET) != off
558 || read(f, buffer, last) != last) {
559 perr("Unable to read directory");
563 for (p = buffer, i = 0; i < last; i++, p += 32) {
564 if (dir->fsckflags & DIREMPWARN) {
569 if (*p == SLOT_EMPTY || *p == SLOT_DELETED) {
570 if (*p == SLOT_EMPTY) {
571 dir->fsckflags |= DIREMPTY;
578 if (dir->fsckflags & DIREMPTY) {
579 if (!(dir->fsckflags & DIREMPWARN)) {
580 pwarn("%s has entries after end of directory\n",
582 if (ask(1, "Extend")) {
585 dir->fsckflags &= ~DIREMPTY;
586 if (delete(f, boot, fat,
587 empcl, empty - buffer,
588 cl, p - buffer, 1) == FSFATAL)
590 q = ((empcl == cl) ? empty : buffer);
592 for (; q < p; q += 32)
594 mod |= THISMOD|FSDIRMOD;
595 } else if (ask(0, "Truncate"))
596 dir->fsckflags |= DIREMPWARN;
598 if (dir->fsckflags & DIREMPWARN) {
600 mod |= THISMOD|FSDIRMOD;
602 } else if (dir->fsckflags & DIREMPTY)
607 if (p[11] == ATTR_WIN95) {
609 if (shortSum != -1) {
615 memset(longName, 0, sizeof longName);
619 } else if (shortSum != p[13]
620 || lidx != (*p & LRNOMASK)) {
631 lidx = *p & LRNOMASK;
633 pwarn("invalid long name\n");
641 t = longName + --lidx * 13;
642 for (k = 1; k < 11 && t < longName +
643 sizeof(longName); k += 2) {
644 if (!p[k] && !p[k + 1])
648 * Warn about those unusable chars in msdosfs here? XXX
654 for (k = 14; k < 26 && t < longName + sizeof(longName); k += 2) {
655 if (!p[k] && !p[k + 1])
662 for (k = 28; k < 32 && t < longName + sizeof(longName); k += 2) {
663 if (!p[k] && !p[k + 1])
669 if (t >= longName + sizeof(longName)) {
670 pwarn("long filename too long\n");
677 if (p[26] | (p[27] << 8)) {
678 pwarn("long filename record cluster start != 0\n");
685 continue; /* long records don't carry further
690 * This is a standard msdosfs directory entry.
692 memset(&dirent, 0, sizeof dirent);
695 * it's a short name record, but we need to know
696 * more, so get the flags first.
698 dirent.flags = p[11];
701 * Translate from 850 to ISO here XXX
703 for (j = 0; j < 8; j++)
704 dirent.name[j] = p[j];
705 dirent.name[8] = '\0';
706 for (k = 7; k >= 0 && dirent.name[k] == ' '; k--)
707 dirent.name[k] = '\0';
708 if (k < 0 || dirent.name[k] != '\0')
710 if (dirent.name[0] == SLOT_E5)
711 dirent.name[0] = 0xe5;
713 if (dirent.flags & ATTR_VOLUME) {
714 if (vallfn || invlfn) {
715 mod |= removede(f, boot, fat,
716 invlfn ? invlfn : vallfn, p,
717 invlfn ? invcl : valcl, -1, 0,
726 dirent.name[k++] = '.';
727 for (j = 0; j < 3; j++)
728 dirent.name[k++] = p[j+8];
729 dirent.name[k] = '\0';
730 for (k--; k >= 0 && dirent.name[k] == ' '; k--)
731 dirent.name[k] = '\0';
733 if (vallfn && shortSum != calcShortSum(p)) {
740 dirent.head = p[26] | (p[27] << 8);
741 if (boot->ClustMask == CLUST32_MASK)
742 dirent.head |= (p[20] << 16) | (p[21] << 24);
743 dirent.size = p[28] | (p[29] << 8) | (p[30] << 16) | (p[31] << 24);
745 strlcpy(dirent.lname, longName,
746 sizeof(dirent.lname));
752 dirent.next = dir->child;
755 mod |= k = removede(f, boot, fat,
756 invlfn, vallfn ? vallfn : p,
757 invcl, vallfn ? valcl : cl, cl,
758 fullpath(&dirent), 0);
762 ? (valcl == cl && vallfn != buffer)
768 vallfn = NULL; /* not used any longer */
771 if (dirent.size == 0 && !(dirent.flags & ATTR_DIRECTORY)) {
772 if (dirent.head != 0) {
773 pwarn("%s has clusters, but size 0\n",
775 if (ask(1, "Drop allocated clusters")) {
777 if (boot->ClustMask == CLUST32_MASK)
779 clearchain(boot, fat, dirent.head);
781 mod |= THISMOD|FSDIRMOD|FSFATMOD;
785 } else if (dirent.head == 0
786 && !strcmp(dirent.name, "..")
787 && dir->parent /* XXX */
788 && !dir->parent->parent) {
790 * Do nothing, the parent is the root
792 } else if (dirent.head < CLUST_FIRST
793 || dirent.head >= boot->NumClusters
794 || fat[dirent.head].next == CLUST_FREE
795 || (fat[dirent.head].next >= CLUST_RSRVD
796 && fat[dirent.head].next < CLUST_EOFS)
797 || fat[dirent.head].head != dirent.head) {
798 if (dirent.head == 0)
799 pwarn("%s has no clusters\n",
801 else if (dirent.head < CLUST_FIRST
802 || dirent.head >= boot->NumClusters)
803 pwarn("%s starts with cluster out of range(%u)\n",
806 else if (fat[dirent.head].next == CLUST_FREE)
807 pwarn("%s starts with free cluster\n",
809 else if (fat[dirent.head].next >= CLUST_RSRVD)
810 pwarn("%s starts with cluster marked %s\n",
812 rsrvdcltype(fat[dirent.head].next));
814 pwarn("%s doesn't start a cluster chain\n",
816 if (dirent.flags & ATTR_DIRECTORY) {
817 if (ask(0, "Remove")) {
819 mod |= THISMOD|FSDIRMOD;
824 if (ask(1, "Truncate")) {
825 p[28] = p[29] = p[30] = p[31] = 0;
827 if (boot->ClustMask == CLUST32_MASK)
830 mod |= THISMOD|FSDIRMOD;
836 if (dirent.head >= CLUST_FIRST && dirent.head < boot->NumClusters)
837 fat[dirent.head].flags |= FAT_USED;
839 if (dirent.flags & ATTR_DIRECTORY) {
841 * gather more info for directories
843 struct dirTodoNode *n;
846 pwarn("Directory %s has size != 0\n",
848 if (ask(1, "Correct")) {
849 p[28] = p[29] = p[30] = p[31] = 0;
851 mod |= THISMOD|FSDIRMOD;
856 * handle `.' and `..' specially
858 if (strcmp(dirent.name, ".") == 0) {
859 if (dirent.head != dir->head) {
860 pwarn("`.' entry in %s has incorrect start cluster\n",
862 if (ask(1, "Correct")) {
863 dirent.head = dir->head;
864 p[26] = (u_char)dirent.head;
865 p[27] = (u_char)(dirent.head >> 8);
866 if (boot->ClustMask == CLUST32_MASK) {
867 p[20] = (u_char)(dirent.head >> 16);
868 p[21] = (u_char)(dirent.head >> 24);
870 mod |= THISMOD|FSDIRMOD;
876 if (strcmp(dirent.name, "..") == 0) {
877 if (dir->parent) { /* XXX */
878 if (!dir->parent->parent) {
880 pwarn("`..' entry in %s has non-zero start cluster\n",
882 if (ask(1, "Correct")) {
885 if (boot->ClustMask == CLUST32_MASK)
887 mod |= THISMOD|FSDIRMOD;
891 } else if (dirent.head != dir->parent->head) {
892 pwarn("`..' entry in %s has incorrect start cluster\n",
894 if (ask(1, "Correct")) {
895 dirent.head = dir->parent->head;
896 p[26] = (u_char)dirent.head;
897 p[27] = (u_char)(dirent.head >> 8);
898 if (boot->ClustMask == CLUST32_MASK) {
899 p[20] = (u_char)(dirent.head >> 16);
900 p[21] = (u_char)(dirent.head >> 24);
902 mod |= THISMOD|FSDIRMOD;
910 * Only one directory entry can point
911 * to dir->head, it's '.'.
913 if (dirent.head == dir->head) {
914 pwarn("%s entry in %s has incorrect start cluster\n",
915 dirent.name, fullpath(dir));
916 if (ask(1, "Remove")) {
918 mod |= THISMOD|FSDIRMOD;
922 } else if ((check_subdirectory(f, boot,
923 &dirent) & FSERROR) == FSERROR) {
925 * A subdirectory should have
926 * a dot (.) entry and a dot-dot
927 * (..) entry of ATTR_DIRECTORY,
928 * we will inspect further when
929 * traversing into it.
931 if (ask(1, "Remove")) {
933 mod |= THISMOD|FSDIRMOD;
940 /* create directory tree node */
941 if (!(d = newDosDirEntry())) {
942 perr("No space for directory");
945 memcpy(d, &dirent, sizeof(struct dosDirEntry));
946 /* link it into the tree */
949 /* Enter this directory into the todo list */
950 if (!(n = newDirTodo())) {
951 perr("No space for todo list");
954 n->next = pendingDirectories;
956 pendingDirectories = n;
958 mod |= k = checksize(boot, fat, p, &dirent);
965 if (!(boot->flags & FAT32) && !dir->parent)
970 if (lseek(f, off, SEEK_SET) != off
971 || write(f, buffer, last) != last) {
972 perr("Unable to write directory");
977 } while ((cl = fat[cl].next) >= CLUST_FIRST && cl < boot->NumClusters);
978 if (invlfn || vallfn)
979 mod |= removede(f, boot, fat,
980 invlfn ? invlfn : vallfn, p,
981 invlfn ? invcl : valcl, -1, 0,
984 /* The root directory of non fat32 filesystems is in a special
985 * area and may have been modified above without being written out.
987 if ((mod & FSDIRMOD) && !(boot->flags & FAT32) && !dir->parent) {
989 if (lseek(f, off, SEEK_SET) != off
990 || write(f, buffer, last) != last) {
991 perr("Unable to write directory");
996 return mod & ~THISMOD;
1000 handleDirTree(int dosfs, struct bootblock *boot, struct fatEntry *fat)
1004 mod = readDosDirSection(dosfs, boot, fat, rootDir);
1009 * process the directory todo list
1011 while (pendingDirectories) {
1012 struct dosDirEntry *dir = pendingDirectories->dir;
1013 struct dirTodoNode *n = pendingDirectories->next;
1016 * remove TODO entry now, the list might change during
1019 freeDirTodo(pendingDirectories);
1020 pendingDirectories = n;
1023 * handle subdirectory
1025 mod |= readDosDirSection(dosfs, boot, fat, dir);
1034 * Try to reconnect a FAT chain into dir
1036 static u_char *lfbuf;
1041 reconnect(int dosfs, struct bootblock *boot, struct fatEntry *fat, cl_t head)
1043 struct dosDirEntry d;
1047 if (!ask(1, "Reconnect"))
1051 for (lostDir = rootDir->child; lostDir; lostDir = lostDir->next) {
1052 if (!strcmp(lostDir->name, LOSTDIR))
1055 if (!lostDir) { /* Create LOSTDIR? XXX */
1056 pwarn("No %s directory\n", LOSTDIR);
1061 lfbuf = malloc(boot->ClusterSize);
1063 perr("No space for buffer");
1071 for (; p < lfbuf + boot->ClusterSize; p += 32)
1072 if (*p == SLOT_EMPTY
1073 || *p == SLOT_DELETED)
1075 if (p && p < lfbuf + boot->ClusterSize)
1077 lfcl = p ? fat[lfcl].next : lostDir->head;
1078 if (lfcl < CLUST_FIRST || lfcl >= boot->NumClusters) {
1079 /* Extend LOSTDIR? XXX */
1080 pwarn("No space in %s\n", LOSTDIR);
1081 lfcl = (lostDir->head < boot->NumClusters) ? lostDir->head : 0;
1084 lfoff = lfcl * boot->ClusterSize
1085 + boot->ClusterOffset * boot->bpbBytesPerSec;
1086 if (lseek(dosfs, lfoff, SEEK_SET) != lfoff
1087 || (size_t)read(dosfs, lfbuf, boot->ClusterSize) != boot->ClusterSize) {
1088 perr("could not read LOST.DIR");
1095 /* Ensure uniqueness of entry here! XXX */
1096 memset(&d, 0, sizeof d);
1097 /* worst case -1 = 4294967295, 10 digits */
1098 len = snprintf(d.name, sizeof(d.name), "%u", head);
1101 d.size = fat[head].length * boot->ClusterSize;
1103 memcpy(p, d.name, len);
1104 memset(p + len, ' ', 11 - len);
1105 memset(p + 11, 0, 32 - 11);
1106 p[26] = (u_char)d.head;
1107 p[27] = (u_char)(d.head >> 8);
1108 if (boot->ClustMask == CLUST32_MASK) {
1109 p[20] = (u_char)(d.head >> 16);
1110 p[21] = (u_char)(d.head >> 24);
1112 p[28] = (u_char)d.size;
1113 p[29] = (u_char)(d.size >> 8);
1114 p[30] = (u_char)(d.size >> 16);
1115 p[31] = (u_char)(d.size >> 24);
1116 fat[head].flags |= FAT_USED;
1117 if (lseek(dosfs, lfoff, SEEK_SET) != lfoff
1118 || (size_t)write(dosfs, lfbuf, boot->ClusterSize) != boot->ClusterSize) {
1119 perr("could not write LOST.DIR");