1 /* Copyright 1986-1992 Emmet P. Gray.
2 * Copyright 1996-1998,2001,2002,2009 Alain Knaff.
3 * This file is part of mtools.
4 *
5 * Mtools is free software: you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation, either version 3 of the License, or
8 * (at your option) any later version.
9 *
10 * Mtools is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with Mtools. If not, see <http://www.gnu.org/licenses/>.
17 */
18
19 #include "sysincludes.h"
20 #include "msdos.h"
21 #include "fsP.h"
22 #include "mtoolsDirentry.h"
23
24 /*
25 * Remove a string of FAT entries (delete the file). The argument is
26 * the beginning of the string. Does not consider the file length, so
27 * if FAT is corrupted, watch out!
28 */
29
fat_free(Stream_t * Dir,unsigned int fat)30 int fat_free(Stream_t *Dir, unsigned int fat)
31 {
32 Stream_t *Stream = GetFs(Dir);
33 DeclareThis(Fs_t);
34 unsigned int next_no_step;
35 /* a zero length file? */
36 if (fat == 0)
37 return(0);
38 /* CONSTCOND */
39 while (!This->fat_error) {
40 /* get next cluster number */
41 next_no_step = fatDecode(This,fat);
42 /* mark current cluster as empty */
43 fatDeallocate(This,fat);
44 if (next_no_step >= This->last_fat)
45 break;
46 fat = next_no_step;
47 }
48 return(0);
49 }
50
fatFreeWithDir(Stream_t * Dir,struct directory * dir)51 int fatFreeWithDir(Stream_t *Dir, struct directory *dir)
52 {
53 unsigned int first;
54
55 if((!strncmp(dir->name,". ",8) ||
56 !strncmp(dir->name,".. ",8)) &&
57 !strncmp(dir->ext," ",3)) {
58 fprintf(stderr,"Trying to remove . or .. entry\n");
59 return -1;
60 }
61
62 first = START(dir);
63 if(fat32RootCluster(Dir))
64 first |= STARTHI(dir) << 16;
65 return fat_free(Dir, first);
66 }
67
fatFreeWithDirentry(direntry_t * entry)68 int fatFreeWithDirentry(direntry_t *entry)
69 {
70 return fatFreeWithDir(entry->Dir, &entry->dir);
71 }
72
73