Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 1 | /* Copyright 1996,1997,2001,2002,2007,2009 Alain Knaff. |
| 2 | * This file is part of mtools. |
| 3 | * |
| 4 | * Mtools is free software: you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License as published by |
| 6 | * the Free Software Foundation, either version 3 of the License, or |
| 7 | * (at your option) any later version. |
| 8 | * |
| 9 | * Mtools is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with Mtools. If not, see <http://www.gnu.org/licenses/>. |
| 16 | * |
| 17 | * streamcache.c |
| 18 | * Managing a cache of open disks |
| 19 | */ |
| 20 | |
| 21 | #include "sysincludes.h" |
| 22 | #include "msdos.h" |
| 23 | #include "mtools.h" |
| 24 | #include "vfat.h" |
| 25 | #include "fs.h" |
| 26 | #include "mainloop.h" |
| 27 | #include "plain_io.h" |
| 28 | #include "file.h" |
| 29 | |
| 30 | static int is_initialized = 0; |
| 31 | static Stream_t *fss[256]; /* open drives */ |
| 32 | |
| 33 | static void finish_sc(void) |
| 34 | { |
| 35 | int i; |
| 36 | |
| 37 | for(i=0; i<256; i++){ |
| 38 | if(fss[i] && fss[i]->refs != 1 ) |
| 39 | fprintf(stderr,"Streamcache allocation problem:%c %d\n", |
| 40 | i, fss[i]->refs); |
| 41 | FREE(&(fss[i])); |
| 42 | } |
| 43 | } |
| 44 | |
| 45 | static void init_streamcache(void) |
| 46 | { |
| 47 | int i; |
| 48 | |
| 49 | if(is_initialized) |
| 50 | return; |
| 51 | is_initialized = 1; |
| 52 | for(i=0; i<256; i++) |
| 53 | fss[i]=0; |
| 54 | atexit(finish_sc); |
| 55 | } |
| 56 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 57 | Stream_t *open_root_dir(char drive, int flags, int *isRop) |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 58 | { |
| 59 | Stream_t *Fs; |
| 60 | |
| 61 | init_streamcache(); |
| 62 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 63 | drive = (char)toupper(drive); |
| 64 | |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 65 | /* open the drive */ |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 66 | if(fss[(unsigned char)drive]) |
| 67 | Fs = fss[(unsigned char)drive]; |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 68 | else { |
| 69 | Fs = fs_init(drive, flags, isRop); |
| 70 | if (!Fs){ |
| 71 | fprintf(stderr, "Cannot initialize '%c:'\n", drive); |
| 72 | return NULL; |
| 73 | } |
| 74 | |
Yi Kong | 39bbd96 | 2022-01-09 19:41:38 +0800 | [diff] [blame] | 75 | fss[(unsigned char)drive] = Fs; |
Alistair Delva | beaee83 | 2021-02-24 11:27:23 -0800 | [diff] [blame] | 76 | } |
| 77 | |
| 78 | return OpenRoot(Fs); |
| 79 | } |