blob: f7c1d5bd5380bf48b122888627889e3bfb47d25b [file] [log] [blame]
Alistair Delvabeaee832021-02-24 11:27:23 -08001/* 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
30int 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
51int fatFreeWithDir(Stream_t *Dir, struct directory *dir)
52{
Yi Kong39bbd962022-01-09 19:41:38 +080053 uint32_t first;
Alistair Delvabeaee832021-02-24 11:27:23 -080054
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))
Yi Kong39bbd962022-01-09 19:41:38 +080064 first |= (uint32_t) STARTHI(dir) << 16;
Alistair Delvabeaee832021-02-24 11:27:23 -080065 return fat_free(Dir, first);
66}
67
68int fatFreeWithDirentry(direntry_t *entry)
69{
70 return fatFreeWithDir(entry->Dir, &entry->dir);
71}