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 = (struct dosDirEntry *)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 = (struct dirTodoNode *)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;
632 t = longName + --lidx * 13;
633 for (k = 1; k < 11 && t < longName +
634 sizeof(longName); k += 2) {
635 if (!p[k] && !p[k + 1])
639 * Warn about those unusable chars in msdosfs here? XXX
645 for (k = 14; k < 26 && t < longName + sizeof(longName); k += 2) {
646 if (!p[k] && !p[k + 1])
653 for (k = 28; k < 32 && t < longName + sizeof(longName); k += 2) {
654 if (!p[k] && !p[k + 1])
660 if (t >= longName + sizeof(longName)) {
661 pwarn("long filename too long\n");
668 if (p[26] | (p[27] << 8)) {
669 pwarn("long filename record cluster start != 0\n");
676 continue; /* long records don't carry further
681 * This is a standard msdosfs directory entry.
683 memset(&dirent, 0, sizeof dirent);
686 * it's a short name record, but we need to know
687 * more, so get the flags first.
689 dirent.flags = p[11];
692 * Translate from 850 to ISO here XXX
694 for (j = 0; j < 8; j++)
695 dirent.name[j] = p[j];
696 dirent.name[8] = '\0';
697 for (k = 7; k >= 0 && dirent.name[k] == ' '; k--)
698 dirent.name[k] = '\0';
699 if (k < 0 || dirent.name[k] != '\0')
701 if (dirent.name[0] == SLOT_E5)
702 dirent.name[0] = 0xe5;
704 if (dirent.flags & ATTR_VOLUME) {
705 if (vallfn || invlfn) {
706 mod |= removede(f, boot, fat,
707 invlfn ? invlfn : vallfn, p,
708 invlfn ? invcl : valcl, -1, 0,
717 dirent.name[k++] = '.';
718 for (j = 0; j < 3; j++)
719 dirent.name[k++] = p[j+8];
720 dirent.name[k] = '\0';
721 for (k--; k >= 0 && dirent.name[k] == ' '; k--)
722 dirent.name[k] = '\0';
724 if (vallfn && shortSum != calcShortSum(p)) {
731 dirent.head = p[26] | (p[27] << 8);
732 if (boot->ClustMask == CLUST32_MASK)
733 dirent.head |= (p[20] << 16) | (p[21] << 24);
734 dirent.size = p[28] | (p[29] << 8) | (p[30] << 16) | (p[31] << 24);
736 strlcpy(dirent.lname, longName,
737 sizeof(dirent.lname));
743 dirent.next = dir->child;
746 mod |= k = removede(f, boot, fat,
747 invlfn, vallfn ? vallfn : p,
748 invcl, vallfn ? valcl : cl, cl,
749 fullpath(&dirent), 0);
753 ? (valcl == cl && vallfn != buffer)
759 vallfn = NULL; /* not used any longer */
762 if (dirent.size == 0 && !(dirent.flags & ATTR_DIRECTORY)) {
763 if (dirent.head != 0) {
764 pwarn("%s has clusters, but size 0\n",
766 if (ask(1, "Drop allocated clusters")) {
768 if (boot->ClustMask == CLUST32_MASK)
770 clearchain(boot, fat, dirent.head);
772 mod |= THISMOD|FSDIRMOD|FSFATMOD;
776 } else if (dirent.head == 0
777 && !strcmp(dirent.name, "..")
778 && dir->parent /* XXX */
779 && !dir->parent->parent) {
781 * Do nothing, the parent is the root
783 } else if (dirent.head < CLUST_FIRST
784 || dirent.head >= boot->NumClusters
785 || fat[dirent.head].next == CLUST_FREE
786 || (fat[dirent.head].next >= CLUST_RSRVD
787 && fat[dirent.head].next < CLUST_EOFS)
788 || fat[dirent.head].head != dirent.head) {
789 if (dirent.head == 0)
790 pwarn("%s has no clusters\n",
792 else if (dirent.head < CLUST_FIRST
793 || dirent.head >= boot->NumClusters)
794 pwarn("%s starts with cluster out of range(%u)\n",
797 else if (fat[dirent.head].next == CLUST_FREE)
798 pwarn("%s starts with free cluster\n",
800 else if (fat[dirent.head].next >= CLUST_RSRVD)
801 pwarn("%s starts with cluster marked %s\n",
803 rsrvdcltype(fat[dirent.head].next));
805 pwarn("%s doesn't start a cluster chain\n",
807 if (dirent.flags & ATTR_DIRECTORY) {
808 if (ask(0, "Remove")) {
810 mod |= THISMOD|FSDIRMOD;
815 if (ask(1, "Truncate")) {
816 p[28] = p[29] = p[30] = p[31] = 0;
818 if (boot->ClustMask == CLUST32_MASK)
821 mod |= THISMOD|FSDIRMOD;
827 if (dirent.head >= CLUST_FIRST && dirent.head < boot->NumClusters)
828 fat[dirent.head].flags |= FAT_USED;
830 if (dirent.flags & ATTR_DIRECTORY) {
832 * gather more info for directories
834 struct dirTodoNode *n;
837 pwarn("Directory %s has size != 0\n",
839 if (ask(1, "Correct")) {
840 p[28] = p[29] = p[30] = p[31] = 0;
842 mod |= THISMOD|FSDIRMOD;
847 * handle `.' and `..' specially
849 if (strcmp(dirent.name, ".") == 0) {
850 if (dirent.head != dir->head) {
851 pwarn("`.' entry in %s has incorrect start cluster\n",
853 if (ask(1, "Correct")) {
854 dirent.head = dir->head;
855 p[26] = (u_char)dirent.head;
856 p[27] = (u_char)(dirent.head >> 8);
857 if (boot->ClustMask == CLUST32_MASK) {
858 p[20] = (u_char)(dirent.head >> 16);
859 p[21] = (u_char)(dirent.head >> 24);
861 mod |= THISMOD|FSDIRMOD;
867 if (strcmp(dirent.name, "..") == 0) {
868 if (dir->parent) { /* XXX */
869 if (!dir->parent->parent) {
871 pwarn("`..' entry in %s has non-zero start cluster\n",
873 if (ask(1, "Correct")) {
876 if (boot->ClustMask == CLUST32_MASK)
878 mod |= THISMOD|FSDIRMOD;
882 } else if (dirent.head != dir->parent->head) {
883 pwarn("`..' entry in %s has incorrect start cluster\n",
885 if (ask(1, "Correct")) {
886 dirent.head = dir->parent->head;
887 p[26] = (u_char)dirent.head;
888 p[27] = (u_char)(dirent.head >> 8);
889 if (boot->ClustMask == CLUST32_MASK) {
890 p[20] = (u_char)(dirent.head >> 16);
891 p[21] = (u_char)(dirent.head >> 24);
893 mod |= THISMOD|FSDIRMOD;
901 * Only one directory entry can point
902 * to dir->head, it's '.'.
904 if (dirent.head == dir->head) {
905 pwarn("%s entry in %s has incorrect start cluster\n",
906 dirent.name, fullpath(dir));
907 if (ask(1, "Remove")) {
909 mod |= THISMOD|FSDIRMOD;
913 } else if ((check_subdirectory(f, boot,
914 &dirent) & FSERROR) == FSERROR) {
916 * A subdirectory should have
917 * a dot (.) entry and a dot-dot
918 * (..) entry of ATTR_DIRECTORY,
919 * we will inspect further when
920 * traversing into it.
922 if (ask(1, "Remove")) {
924 mod |= THISMOD|FSDIRMOD;
931 /* create directory tree node */
932 if (!(d = newDosDirEntry())) {
933 perr("No space for directory");
936 memcpy(d, &dirent, sizeof(struct dosDirEntry));
937 /* link it into the tree */
940 /* Enter this directory into the todo list */
941 if (!(n = newDirTodo())) {
942 perr("No space for todo list");
945 n->next = pendingDirectories;
947 pendingDirectories = n;
949 mod |= k = checksize(boot, fat, p, &dirent);
956 if (!(boot->flags & FAT32) && !dir->parent)
961 if (lseek(f, off, SEEK_SET) != off
962 || write(f, buffer, last) != last) {
963 perr("Unable to write directory");
968 } while ((cl = fat[cl].next) >= CLUST_FIRST && cl < boot->NumClusters);
969 if (invlfn || vallfn)
970 mod |= removede(f, boot, fat,
971 invlfn ? invlfn : vallfn, p,
972 invlfn ? invcl : valcl, -1, 0,
975 /* The root directory of non fat32 filesystems is in a special
976 * area and may have been modified above without being written out.
978 if ((mod & FSDIRMOD) && !(boot->flags & FAT32) && !dir->parent) {
980 if (lseek(f, off, SEEK_SET) != off
981 || write(f, buffer, last) != last) {
982 perr("Unable to write directory");
987 return mod & ~THISMOD;
991 handleDirTree(int dosfs, struct bootblock *boot, struct fatEntry *fat)
995 mod = readDosDirSection(dosfs, boot, fat, rootDir);
1000 * process the directory todo list
1002 while (pendingDirectories) {
1003 struct dosDirEntry *dir = pendingDirectories->dir;
1004 struct dirTodoNode *n = pendingDirectories->next;
1007 * remove TODO entry now, the list might change during
1010 freeDirTodo(pendingDirectories);
1011 pendingDirectories = n;
1014 * handle subdirectory
1016 mod |= readDosDirSection(dosfs, boot, fat, dir);
1025 * Try to reconnect a FAT chain into dir
1027 static u_char *lfbuf;
1032 reconnect(int dosfs, struct bootblock *boot, struct fatEntry *fat, cl_t head)
1034 struct dosDirEntry d;
1038 if (!ask(1, "Reconnect"))
1042 for (lostDir = rootDir->child; lostDir; lostDir = lostDir->next) {
1043 if (!strcmp(lostDir->name, LOSTDIR))
1046 if (!lostDir) { /* Create LOSTDIR? XXX */
1047 pwarn("No %s directory\n", LOSTDIR);
1052 lfbuf = malloc(boot->ClusterSize);
1054 perr("No space for buffer");
1062 for (; p < lfbuf + boot->ClusterSize; p += 32)
1063 if (*p == SLOT_EMPTY
1064 || *p == SLOT_DELETED)
1066 if (p && p < lfbuf + boot->ClusterSize)
1068 lfcl = p ? fat[lfcl].next : lostDir->head;
1069 if (lfcl < CLUST_FIRST || lfcl >= boot->NumClusters) {
1070 /* Extend LOSTDIR? XXX */
1071 pwarn("No space in %s\n", LOSTDIR);
1072 lfcl = (lostDir->head < boot->NumClusters) ? lostDir->head : 0;
1075 lfoff = lfcl * boot->ClusterSize
1076 + boot->ClusterOffset * boot->bpbBytesPerSec;
1077 if (lseek(dosfs, lfoff, SEEK_SET) != lfoff
1078 || (size_t)read(dosfs, lfbuf, boot->ClusterSize) != boot->ClusterSize) {
1079 perr("could not read LOST.DIR");
1086 /* Ensure uniqueness of entry here! XXX */
1087 memset(&d, 0, sizeof d);
1088 /* worst case -1 = 4294967295, 10 digits */
1089 len = snprintf(d.name, sizeof(d.name), "%u", head);
1092 d.size = fat[head].length * boot->ClusterSize;
1094 memcpy(p, d.name, len);
1095 memset(p + len, ' ', 11 - len);
1096 memset(p + 11, 0, 32 - 11);
1097 p[26] = (u_char)d.head;
1098 p[27] = (u_char)(d.head >> 8);
1099 if (boot->ClustMask == CLUST32_MASK) {
1100 p[20] = (u_char)(d.head >> 16);
1101 p[21] = (u_char)(d.head >> 24);
1103 p[28] = (u_char)d.size;
1104 p[29] = (u_char)(d.size >> 8);
1105 p[30] = (u_char)(d.size >> 16);
1106 p[31] = (u_char)(d.size >> 24);
1107 fat[head].flags |= FAT_USED;
1108 if (lseek(dosfs, lfoff, SEEK_SET) != lfoff
1109 || (size_t)write(dosfs, lfbuf, boot->ClusterSize) != boot->ClusterSize) {
1110 perr("could not write LOST.DIR");