Rev Author Line No. Line
1234 kaklik 1 /*----------------------------------------------------------------------------/
2 / FatFs - FAT file system module R0.06 (C)ChaN, 2008
3 /-----------------------------------------------------------------------------/
4 / The FatFs module is an experimenal project to implement FAT file system to
5 / cheap microcontrollers. This is a free software and is opened for education,
6 / research and development under license policy of following trems.
7 /
8 / Copyright (C) 2008, ChaN, all right reserved.
9 /
10 / * The FatFs module is a free software and there is no warranty.
11 / * You can use, modify and/or redistribute it for personal, non-profit or
12 / commercial use without restriction under your responsibility.
13 / * Redistributions of source code must retain the above copyright notice.
14 /
15 /-----------------------------------------------------------------------------/
16 / Feb 26,'06 R0.00 Prototype.
17 /
18 / Apr 29,'06 R0.01 First stable version.
19 /
20 / Jun 01,'06 R0.02 Added FAT12 support.
21 / Removed unbuffered mode.
22 / Fixed a problem on small (<32M) patition.
23 / Jun 10,'06 R0.02a Added a configuration option (_FS_MINIMUM).
24 /
25 / Sep 22,'06 R0.03 Added f_rename().
26 / Changed option _FS_MINIMUM to _FS_MINIMIZE.
27 / Dec 11,'06 R0.03a Improved cluster scan algolithm to write files fast.
28 / Fixed f_mkdir() creates incorrect directory on FAT32.
29 /
30 / Feb 04,'07 R0.04 Supported multiple drive system.
31 / Changed some interfaces for multiple drive system.
32 / Changed f_mountdrv() to f_mount().
33 / Added f_mkfs().
34 / Apr 01,'07 R0.04a Supported multiple partitions on a plysical drive.
35 / Added a capability of extending file size to f_lseek().
36 / Added minimization level 3.
37 / Fixed an endian sensitive code in f_mkfs().
38 / May 05,'07 R0.04b Added a configuration option _USE_NTFLAG.
39 / Added FSInfo support.
40 / Fixed DBCS name can result FR_INVALID_NAME.
41 / Fixed short seek (<= csize) collapses the file object.
42 /
43 / Aug 25,'07 R0.05 Changed arguments of f_read(), f_write() and f_mkfs().
44 / Fixed f_mkfs() on FAT32 creates incorrect FSInfo.
45 / Fixed f_mkdir() on FAT32 creates incorrect directory.
46 / Feb 03,'08 R0.05a Added f_truncate() and f_utime().
47 / Fixed off by one error at FAT sub-type determination.
48 / Fixed btr in f_read() can be mistruncated.
49 / Fixed cached sector is not flushed when create and close
50 / without write.
51 /
52 / Apr 01,'08 R0.06 Added fputc(), fputs(), fprintf() and fgets().
53 / Improved performance of f_lseek() on moving to the same
54 / or following cluster.
55 /---------------------------------------------------------------------------*/
56  
57 #include <string.h>
58 #include "ff.h" /* FatFs declarations */
59 #include "diskio.h" /* Include file for user provided disk functions */
60  
61  
62 /*--------------------------------------------------------------------------
63  
64 Module Private Functions
65  
66 ---------------------------------------------------------------------------*/
67  
68 static
69 FATFS *FatFs[_DRIVES]; /* Pointer to the file system objects (logical drives) */
70 static
71 WORD fsid; /* File system mount ID */
72  
73  
74  
75 /*-----------------------------------------------------------------------*/
76 /* Change window offset */
77 /*-----------------------------------------------------------------------*/
78  
79 static
80 BOOL move_window ( /* TRUE: successful, FALSE: failed */
81 FATFS *fs, /* File system object */
82 DWORD sector /* Sector number to make apperance in the fs->win[] */
83 ) /* Move to zero only writes back dirty window */
84 {
85 DWORD wsect;
86  
87  
88 wsect = fs->winsect;
89 if (wsect != sector) { /* Changed current window */
90 #if !_FS_READONLY
91 BYTE n;
92 if (fs->winflag) { /* Write back dirty window if needed */
93 if (disk_write(fs->drive, fs->win, wsect, 1) != RES_OK)
94 return FALSE;
95 fs->winflag = 0;
96 if (wsect < (fs->fatbase + fs->sects_fat)) { /* In FAT area */
97 for (n = fs->n_fats; n >= 2; n--) { /* Refrect the change to FAT copy */
98 wsect += fs->sects_fat;
99 disk_write(fs->drive, fs->win, wsect, 1);
100 }
101 }
102 }
103 #endif
104 if (sector) {
105 if (disk_read(fs->drive, fs->win, sector, 1) != RES_OK)
106 return FALSE;
107 fs->winsect = sector;
108 }
109 }
110 return TRUE;
111 }
112  
113  
114  
115  
116 /*-----------------------------------------------------------------------*/
117 /* Clean-up cached data */
118 /*-----------------------------------------------------------------------*/
119  
120 #if !_FS_READONLY
121 static
122 FRESULT sync ( /* FR_OK: successful, FR_RW_ERROR: failed */
123 FATFS *fs /* File system object */
124 )
125 {
126 fs->winflag = 1;
127 if (!move_window(fs, 0)) return FR_RW_ERROR;
128 #if _USE_FSINFO
129 /* Update FSInfo sector if needed */
130 if (fs->fs_type == FS_FAT32 && fs->fsi_flag) {
131 fs->winsect = 0;
132 memset(fs->win, 0, 512);
133 ST_WORD(&fs->win[BS_55AA], 0xAA55);
134 ST_DWORD(&fs->win[FSI_LeadSig], 0x41615252);
135 ST_DWORD(&fs->win[FSI_StrucSig], 0x61417272);
136 ST_DWORD(&fs->win[FSI_Free_Count], fs->free_clust);
137 ST_DWORD(&fs->win[FSI_Nxt_Free], fs->last_clust);
138 disk_write(fs->drive, fs->win, fs->fsi_sector, 1);
139 fs->fsi_flag = 0;
140 }
141 #endif
142 /* Make sure that no pending write process in the physical drive */
143 if (disk_ioctl(fs->drive, CTRL_SYNC, NULL) != RES_OK)
144 return FR_RW_ERROR;
145 return FR_OK;
146 }
147 #endif
148  
149  
150  
151  
152 /*-----------------------------------------------------------------------*/
153 /* Get a cluster status */
154 /*-----------------------------------------------------------------------*/
155  
156 static
157 DWORD get_cluster ( /* 0,>=2: successful, 1: failed */
158 FATFS *fs, /* File system object */
159 DWORD clust /* Cluster# to get the link information */
160 )
161 {
162 WORD wc, bc;
163 DWORD fatsect;
164  
165  
166 if (clust >= 2 && clust < fs->max_clust) { /* Is it a valid cluster#? */
167 fatsect = fs->fatbase;
168 switch (fs->fs_type) {
169 case FS_FAT12 :
170 bc = (WORD)clust * 3 / 2;
171 if (!move_window(fs, fatsect + (bc / SS(fs)))) break;
172 wc = fs->win[bc & (SS(fs) - 1)]; bc++;
173 if (!move_window(fs, fatsect + (bc / SS(fs)))) break;
174 wc |= (WORD)fs->win[bc & (SS(fs) - 1)] << 8;
175 return (clust & 1) ? (wc >> 4) : (wc & 0xFFF);
176  
177 case FS_FAT16 :
178 if (!move_window(fs, fatsect + (clust / (SS(fs) / 2)))) break;
179 return LD_WORD(&fs->win[((WORD)clust * 2) & (SS(fs) - 1)]);
180  
181 case FS_FAT32 :
182 if (!move_window(fs, fatsect + (clust / (SS(fs) / 4)))) break;
183 return LD_DWORD(&fs->win[((WORD)clust * 4) & (SS(fs) - 1)]) & 0x0FFFFFFF;
184 }
185 }
186  
187 return 1; /* Out of cluster range, or an error occured */
188 }
189  
190  
191  
192  
193 /*-----------------------------------------------------------------------*/
194 /* Change a cluster status */
195 /*-----------------------------------------------------------------------*/
196  
197 #if !_FS_READONLY
198 static
199 BOOL put_cluster ( /* TRUE: successful, FALSE: failed */
200 FATFS *fs, /* File system object */
201 DWORD clust, /* Cluster# to change (must be 2 to fs->max_clust-1) */
202 DWORD val /* New value to mark the cluster */
203 )
204 {
205 WORD bc;
206 BYTE *p;
207 DWORD fatsect;
208  
209  
210 fatsect = fs->fatbase;
211 switch (fs->fs_type) {
212 case FS_FAT12 :
213 bc = (WORD)clust * 3 / 2;
214 if (!move_window(fs, fatsect + (bc / SS(fs)))) return FALSE;
215 p = &fs->win[bc & (SS(fs) - 1)];
216 *p = (clust & 1) ? ((*p & 0x0F) | ((BYTE)val << 4)) : (BYTE)val;
217 bc++;
218 fs->winflag = 1;
219 if (!move_window(fs, fatsect + (bc / SS(fs)))) return FALSE;
220 p = &fs->win[bc & (SS(fs) - 1)];
221 *p = (clust & 1) ? (BYTE)(val >> 4) : ((*p & 0xF0) | ((BYTE)(val >> 8) & 0x0F));
222 break;
223  
224 case FS_FAT16 :
225 if (!move_window(fs, fatsect + (clust / (SS(fs) / 2)))) return FALSE;
226 ST_WORD(&fs->win[((WORD)clust * 2) & (SS(fs) - 1)], (WORD)val);
227 break;
228  
229 case FS_FAT32 :
230 if (!move_window(fs, fatsect + (clust / (SS(fs) / 4)))) return FALSE;
231 ST_DWORD(&fs->win[((WORD)clust * 4) & (SS(fs) - 1)], val);
232 break;
233  
234 default :
235 return FALSE;
236 }
237 fs->winflag = 1;
238 return TRUE;
239 }
240 #endif /* !_FS_READONLY */
241  
242  
243  
244  
245 /*-----------------------------------------------------------------------*/
246 /* Remove a cluster chain */
247 /*-----------------------------------------------------------------------*/
248  
249 #if !_FS_READONLY
250 static
251 BOOL remove_chain ( /* TRUE: successful, FALSE: failed */
252 FATFS *fs, /* File system object */
253 DWORD clust /* Cluster# to remove chain from */
254 )
255 {
256 DWORD nxt;
257  
258  
259 while (clust >= 2 && clust < fs->max_clust) {
260 nxt = get_cluster(fs, clust);
261 if (nxt == 1) return FALSE;
262 if (!put_cluster(fs, clust, 0)) return FALSE;
263 if (fs->free_clust != 0xFFFFFFFF) {
264 fs->free_clust++;
265 #if _USE_FSINFO
266 fs->fsi_flag = 1;
267 #endif
268 }
269 clust = nxt;
270 }
271 return TRUE;
272 }
273 #endif
274  
275  
276  
277  
278 /*-----------------------------------------------------------------------*/
279 /* Stretch or create a cluster chain */
280 /*-----------------------------------------------------------------------*/
281  
282 #if !_FS_READONLY
283 static
284 DWORD create_chain ( /* 0: No free cluster, 1: Error, >=2: New cluster number */
285 FATFS *fs, /* File system object */
286 DWORD clust /* Cluster# to stretch, 0 means create new */
287 )
288 {
289 DWORD cstat, ncl, scl, mcl = fs->max_clust;
290  
291  
292 if (clust == 0) { /* Create new chain */
293 scl = fs->last_clust; /* Get suggested start point */
294 if (scl == 0 || scl >= mcl) scl = 1;
295 }
296 else { /* Stretch existing chain */
297 cstat = get_cluster(fs, clust); /* Check the cluster status */
298 if (cstat < 2) return 1; /* It is an invalid cluster */
299 if (cstat < mcl) return cstat; /* It is already followed by next cluster */
300 scl = clust;
301 }
302  
303 ncl = scl; /* Start cluster */
304 for (;;) {
305 ncl++; /* Next cluster */
306 if (ncl >= mcl) { /* Wrap around */
307 ncl = 2;
308 if (ncl > scl) return 0; /* No free custer */
309 }
310 cstat = get_cluster(fs, ncl); /* Get the cluster status */
311 if (cstat == 0) break; /* Found a free cluster */
312 if (cstat == 1) return 1; /* Any error occured */
313 if (ncl == scl) return 0; /* No free custer */
314 }
315  
316 if (!put_cluster(fs, ncl, 0x0FFFFFFF)) return 1; /* Mark the new cluster "in use" */
317 if (clust != 0 && !put_cluster(fs, clust, ncl)) return 1; /* Link it to previous one if needed */
318  
319 fs->last_clust = ncl; /* Update fsinfo */
320 if (fs->free_clust != 0xFFFFFFFF) {
321 fs->free_clust--;
322 #if _USE_FSINFO
323 fs->fsi_flag = 1;
324 #endif
325 }
326  
327 return ncl; /* Return new cluster number */
328 }
329 #endif /* !_FS_READONLY */
330  
331  
332  
333  
334 /*-----------------------------------------------------------------------*/
335 /* Get sector# from cluster# */
336 /*-----------------------------------------------------------------------*/
337  
338 static
339 DWORD clust2sect ( /* !=0: sector number, 0: failed - invalid cluster# */
340 FATFS *fs, /* File system object */
341 DWORD clust /* Cluster# to be converted */
342 )
343 {
344 clust -= 2;
345 if (clust >= (fs->max_clust - 2)) return 0; /* Invalid cluster# */
346 return clust * fs->csize + fs->database;
347 }
348  
349  
350  
351  
352 /*-----------------------------------------------------------------------*/
353 /* Move directory pointer to next */
354 /*-----------------------------------------------------------------------*/
355  
356 static
357 BOOL next_dir_entry ( /* TRUE: successful, FALSE: could not move next */
358 DIR *dj /* Pointer to directory object */
359 )
360 {
361 DWORD clust;
362 WORD idx;
363  
364  
365 idx = dj->index + 1;
366 if ((idx & ((SS(dj->fs) - 1) / 32)) == 0) { /* Table sector changed? */
367 dj->sect++; /* Next sector */
368 if (dj->clust == 0) { /* In static table */
369 if (idx >= dj->fs->n_rootdir) return FALSE; /* Reached to end of table */
370 } else { /* In dynamic table */
371 if (((idx / (SS(dj->fs) / 32)) & (dj->fs->csize - 1)) == 0) { /* Cluster changed? */
372 clust = get_cluster(dj->fs, dj->clust); /* Get next cluster */
373 if (clust < 2 || clust >= dj->fs->max_clust) /* Reached to end of table */
374 return FALSE;
375 dj->clust = clust; /* Initialize for new cluster */
376 dj->sect = clust2sect(dj->fs, clust);
377 }
378 }
379 }
380 dj->index = idx; /* Lower several bits of dj->index indicates offset in dj->sect */
381 return TRUE;
382 }
383  
384  
385  
386  
387 /*-----------------------------------------------------------------------*/
388 /* Get file status from directory entry */
389 /*-----------------------------------------------------------------------*/
390  
391 #if _FS_MINIMIZE <= 1
392 static
393 void get_fileinfo ( /* No return code */
394 FILINFO *finfo, /* Ptr to store the file information */
395 const BYTE *dir /* Ptr to the directory entry */
396 )
397 {
398 BYTE n, c, a;
399 char *p;
400  
401  
402 p = &finfo->fname[0];
403 a = _USE_NTFLAG ? dir[DIR_NTres] : 0; /* NT flag */
404 for (n = 0; n < 8; n++) { /* Convert file name (body) */
405 c = dir[n];
406 if (c == ' ') break;
407 if (c == 0x05) c = 0xE5;
408 if (a & 0x08 && c >= 'A' && c <= 'Z') c += 0x20;
409 *p++ = c;
410 }
411 if (dir[8] != ' ') { /* Convert file name (extension) */
412 *p++ = '.';
413 for (n = 8; n < 11; n++) {
414 c = dir[n];
415 if (c == ' ') break;
416 if (a & 0x10 && c >= 'A' && c <= 'Z') c += 0x20;
417 *p++ = c;
418 }
419 }
420 *p = '\0';
421  
422 finfo->fattrib = dir[DIR_Attr]; /* Attribute */
423 finfo->fsize = LD_DWORD(&dir[DIR_FileSize]); /* Size */
424 finfo->fdate = LD_WORD(&dir[DIR_WrtDate]); /* Date */
425 finfo->ftime = LD_WORD(&dir[DIR_WrtTime]); /* Time */
426 }
427 #endif /* _FS_MINIMIZE <= 1 */
428  
429  
430  
431  
432 /*-----------------------------------------------------------------------*/
433 /* Pick a paragraph and create the name in format of directory entry */
434 /*-----------------------------------------------------------------------*/
435  
436 static
437 char make_dirfile ( /* 1: error - detected an invalid format, '\0'or'/': next character */
438 const char **path, /* Pointer to the file path pointer */
439 char *dirname /* Pointer to directory name buffer {Name(8), Ext(3), NT flag(1)} */
440 )
441 {
442 BYTE n, t, c, a, b;
443  
444  
445 memset(dirname, ' ', 8+3); /* Fill buffer with spaces */
446 a = 0; b = 0x18; /* NT flag */
447 n = 0; t = 8;
448 for (;;) {
449 c = *(*path)++;
450 if (c == '\0' || c == '/') { /* Reached to end of str or directory separator */
451 if (n == 0) break;
452 dirname[11] = _USE_NTFLAG ? (a & b) : 0;
453 return c;
454 }
455 if (c <= ' ' || c == 0x7F) break; /* Reject invisible chars */
456 if (c == '.') {
457 if (!(a & 1) && n >= 1 && n <= 8) { /* Enter extension part */
458 n = 8; t = 11; continue;
459 }
460 break;
461 }
462 if (_USE_SJIS &&
463 ((c >= 0x81 && c <= 0x9F) || /* Accept S-JIS code */
464 (c >= 0xE0 && c <= 0xFC))) {
465 if (n == 0 && c == 0xE5) /* Change heading \xE5 to \x05 */
466 c = 0x05;
467 a ^= 0x01; goto md_l2;
468 }
469 if (c == '"') break; /* Reject " */
470 if (c <= ')') goto md_l1; /* Accept ! # $ % & ' ( ) */
471 if (c <= ',') break; /* Reject * + , */
472 if (c <= '9') goto md_l1; /* Accept - 0-9 */
473 if (c <= '?') break; /* Reject : ; < = > ? */
474 if (!(a & 1)) { /* These checks are not applied to S-JIS 2nd byte */
475 if (c == '|') break; /* Reject | */
476 if (c >= '[' && c <= ']') break;/* Reject [ \ ] */
477 if (_USE_NTFLAG && c >= 'A' && c <= 'Z')
478 (t == 8) ? (b &= 0xF7) : (b &= 0xEF);
479 if (c >= 'a' && c <= 'z') { /* Convert to upper case */
480 c -= 0x20;
481 if (_USE_NTFLAG) (t == 8) ? (a |= 0x08) : (a |= 0x10);
482 }
483 }
484 md_l1:
485 a &= 0xFE;
486 md_l2:
487 if (n >= t) break;
488 dirname[n++] = c;
489 }
490 return 1;
491 }
492  
493  
494  
495  
496 /*-----------------------------------------------------------------------*/
497 /* Trace a file path */
498 /*-----------------------------------------------------------------------*/
499  
500 static
501 FRESULT trace_path ( /* FR_OK(0): successful, !=0: error code */
502 DIR *dj, /* Pointer to directory object to return last directory */
503 char *fn, /* Pointer to last segment name to return {file(8),ext(3),attr(1)} */
504 const char *path, /* Full-path string to trace a file or directory */
505 BYTE **dir /* Pointer to pointer to found entry to retutn */
506 )
507 {
508 DWORD clust;
509 char ds;
510 BYTE *dptr = NULL;
511 FATFS *fs = dj->fs;
512  
513  
514 /* Initialize directory object */
515 clust = fs->dirbase;
516 if (fs->fs_type == FS_FAT32) {
517 dj->clust = dj->sclust = clust;
518 dj->sect = clust2sect(fs, clust);
519 } else {
520 dj->clust = dj->sclust = 0;
521 dj->sect = clust;
522 }
523 dj->index = 0;
524  
525 if (*path == '\0') { /* Null path means the root directory */
526 *dir = NULL; return FR_OK;
527 }
528  
529 for (;;) {
530 ds = make_dirfile(&path, fn); /* Get a paragraph into fn[] */
531 if (ds == 1) return FR_INVALID_NAME;
532 for (;;) {
533 if (!move_window(fs, dj->sect)) return FR_RW_ERROR;
534 dptr = &fs->win[(dj->index & ((SS(fs) - 1) / 32)) * 32]; /* Pointer to the directory entry */
535 if (dptr[DIR_Name] == 0) /* Has it reached to end of dir? */
536 return !ds ? FR_NO_FILE : FR_NO_PATH;
537 if (dptr[DIR_Name] != 0xE5 /* Matched? */
538 && !(dptr[DIR_Attr] & AM_VOL)
539 && !memcmp(&dptr[DIR_Name], fn, 8+3) ) break;
540 if (!next_dir_entry(dj)) /* Next directory pointer */
541 return !ds ? FR_NO_FILE : FR_NO_PATH;
542 }
543 if (!ds) { *dir = dptr; return FR_OK; } /* Matched with end of path */
544 if (!(dptr[DIR_Attr] & AM_DIR)) return FR_NO_PATH; /* Cannot trace because it is a file */
545 clust = ((DWORD)LD_WORD(&dptr[DIR_FstClusHI]) << 16) | LD_WORD(&dptr[DIR_FstClusLO]); /* Get cluster# of the directory */
546 dj->clust = dj->sclust = clust; /* Restart scanning at the new directory */
547 dj->sect = clust2sect(fs, clust);
548 dj->index = 2;
549 }
550 }
551  
552  
553  
554  
555 /*-----------------------------------------------------------------------*/
556 /* Reserve a directory entry */
557 /*-----------------------------------------------------------------------*/
558  
559 #if !_FS_READONLY
560 static
561 FRESULT reserve_direntry ( /* FR_OK: successful, FR_DENIED: no free entry, FR_RW_ERROR: a disk error occured */
562 DIR *dj, /* Target directory to create new entry */
563 BYTE **dir /* Pointer to pointer to created entry to retutn */
564 )
565 {
566 DWORD clust, sector;
567 BYTE c, n, *dptr;
568 FATFS *fs = dj->fs;
569  
570  
571 /* Re-initialize directory object */
572 clust = dj->sclust;
573 if (clust != 0) { /* Dyanmic directory table */
574 dj->clust = clust;
575 dj->sect = clust2sect(fs, clust);
576 } else { /* Static directory table */
577 dj->sect = fs->dirbase;
578 }
579 dj->index = 0;
580  
581 do {
582 if (!move_window(fs, dj->sect)) return FR_RW_ERROR;
583 dptr = &fs->win[(dj->index & ((SS(dj->fs) - 1) / 32)) * 32]; /* Pointer to the directory entry */
584 c = dptr[DIR_Name];
585 if (c == 0 || c == 0xE5) { /* Found an empty entry */
586 *dir = dptr; return FR_OK;
587 }
588 } while (next_dir_entry(dj)); /* Next directory pointer */
589 /* Reached to end of the directory table */
590  
591 /* Abort when it is a static table or could not stretch dynamic table */
592 if (clust == 0 || !(clust = create_chain(fs, dj->clust))) return FR_DENIED;
593 if (clust == 1 || !move_window(fs, 0)) return FR_RW_ERROR;
594  
595 /* Cleanup the expanded table */
596 fs->winsect = sector = clust2sect(fs, clust);
597 memset(fs->win, 0, SS(fs));
598 for (n = fs->csize; n; n--) {
599 if (disk_write(fs->drive, fs->win, sector, 1) != RES_OK)
600 return FR_RW_ERROR;
601 sector++;
602 }
603 fs->winflag = 1;
604 *dir = fs->win;
605  
606 return FR_OK;
607 }
608 #endif /* !_FS_READONLY */
609  
610  
611  
612  
613 /*-----------------------------------------------------------------------*/
614 /* Load boot record and check if it is an FAT boot record */
615 /*-----------------------------------------------------------------------*/
616  
617 static
618 BYTE check_fs ( /* 0:The FAT boot record, 1:Valid boot record but not an FAT, 2:Not a boot record or error */
619 FATFS *fs, /* File system object */
620 DWORD sect /* Sector# (lba) to check if it is an FAT boot record or not */
621 )
622 {
623 if (disk_read(fs->drive, fs->win, sect, 1) != RES_OK) /* Load boot record */
624 return 2;
625 if (LD_WORD(&fs->win[BS_55AA]) != 0xAA55) /* Check record signature (always placed at offset 510 even if the sector size is >512) */
626 return 2;
627  
628 if (!memcmp(&fs->win[BS_FilSysType], "FAT", 3)) /* Check FAT signature */
629 return 0;
630 if (!memcmp(&fs->win[BS_FilSysType32], "FAT32", 5) && !(fs->win[BPB_ExtFlags] & 0x80))
631 return 0;
632  
633 return 1;
634 }
635  
636  
637  
638  
639 /*-----------------------------------------------------------------------*/
640 /* Make sure that the file system is valid */
641 /*-----------------------------------------------------------------------*/
642  
643 static
644 FRESULT auto_mount ( /* FR_OK(0): successful, !=0: any error occured */
645 const char **path, /* Pointer to pointer to the path name (drive number) */
646 FATFS **rfs, /* Pointer to pointer to the found file system object */
647 BYTE chk_wp /* !=0: Check media write protection for write access */
648 )
649 {
650 BYTE drv, fmt, *tbl;
651 DSTATUS stat;
652 DWORD bootsect, fatsize, totalsect, maxclust;
653 const char *p = *path;
654 FATFS *fs;
655  
656  
657 /* Get drive number from the path name */
658 while (*p == ' ') p++; /* Strip leading spaces */
659 drv = p[0] - '0'; /* Is there a drive number? */
660 if (drv <= 9 && p[1] == ':')
661 p += 2; /* Found a drive number, get and strip it */
662 else
663 drv = 0; /* No drive number is given, use drive number 0 as default */
664 if (*p == '/') p++; /* Strip heading slash */
665 *path = p; /* Return pointer to the path name */
666  
667 /* Check if the drive number is valid or not */
668 if (drv >= _DRIVES) return FR_INVALID_DRIVE; /* Is the drive number valid? */
669 *rfs = fs = FatFs[drv]; /* Returen pointer to the corresponding file system object */
670 if (!fs) return FR_NOT_ENABLED; /* Is the file system object registered? */
671  
672 if (fs->fs_type) { /* If the logical drive has been mounted */
673 stat = disk_status(fs->drive);
674 if (!(stat & STA_NOINIT)) { /* and physical drive is kept initialized (has not been changed), */
675 #if !_FS_READONLY
676 if (chk_wp && (stat & STA_PROTECT)) /* Check write protection if needed */
677 return FR_WRITE_PROTECTED;
678 #endif
679 return FR_OK; /* The file system object is valid */
680 }
681 }
682  
683 /* The logical drive must be re-mounted. Following code attempts to mount the logical drive */
684  
685 memset(fs, 0, sizeof(FATFS)); /* Clean-up the file system object */
686 fs->drive = LD2PD(drv); /* Bind the logical drive and a physical drive */
687 stat = disk_initialize(fs->drive); /* Initialize low level disk I/O layer */
688 if (stat & STA_NOINIT) /* Check if the drive is ready */
689 return FR_NOT_READY;
690 #if S_MAX_SIZ > 512 /* Get disk sector size if needed */
691 if (disk_ioctl(drv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK || SS(fs) > S_MAX_SIZ)
692 return FR_NO_FILESYSTEM;
693 #endif
694 #if !_FS_READONLY
695 if (chk_wp && (stat & STA_PROTECT)) /* Check write protection if needed */
696 return FR_WRITE_PROTECTED;
697 #endif
698 /* Search FAT partition on the drive */
699 fmt = check_fs(fs, bootsect = 0); /* Check sector 0 as an SFD format */
700 if (fmt == 1) { /* Not an FAT boot record, it may be patitioned */
701 /* Check a partition listed in top of the partition table */
702 tbl = &fs->win[MBR_Table + LD2PT(drv) * 16]; /* Partition table */
703 if (tbl[4]) { /* Is the partition existing? */
704 bootsect = LD_DWORD(&tbl[8]); /* Partition offset in LBA */
705 fmt = check_fs(fs, bootsect); /* Check the partition */
706 }
707 }
708 if (fmt || LD_WORD(&fs->win[BPB_BytsPerSec]) != SS(fs)) /* No valid FAT patition is found */
709 return FR_NO_FILESYSTEM;
710  
711 /* Initialize the file system object */
712 fatsize = LD_WORD(&fs->win[BPB_FATSz16]); /* Number of sectors per FAT */
713 if (!fatsize) fatsize = LD_DWORD(&fs->win[BPB_FATSz32]);
714 fs->sects_fat = fatsize;
715 fs->n_fats = fs->win[BPB_NumFATs]; /* Number of FAT copies */
716 fatsize *= fs->n_fats; /* (Number of sectors in FAT area) */
717 fs->fatbase = bootsect + LD_WORD(&fs->win[BPB_RsvdSecCnt]); /* FAT start sector (lba) */
718 fs->csize = fs->win[BPB_SecPerClus]; /* Number of sectors per cluster */
719 fs->n_rootdir = LD_WORD(&fs->win[BPB_RootEntCnt]); /* Nmuber of root directory entries */
720 totalsect = LD_WORD(&fs->win[BPB_TotSec16]); /* Number of sectors on the file system */
721 if (!totalsect) totalsect = LD_DWORD(&fs->win[BPB_TotSec32]);
722 fs->max_clust = maxclust = (totalsect /* max_clust = Last cluster# + 1 */
723 - LD_WORD(&fs->win[BPB_RsvdSecCnt]) - fatsize - fs->n_rootdir / (SS(fs)/32)
724 ) / fs->csize + 2;
725  
726 fmt = FS_FAT12; /* Determine the FAT sub type */
727 if (maxclust >= 0xFF7) fmt = FS_FAT16;
728 if (maxclust >= 0xFFF7) fmt = FS_FAT32;
729  
730 if (fmt == FS_FAT32)
731 fs->dirbase = LD_DWORD(&fs->win[BPB_RootClus]); /* Root directory start cluster */
732 else
733 fs->dirbase = fs->fatbase + fatsize; /* Root directory start sector (lba) */
734 fs->database = fs->fatbase + fatsize + fs->n_rootdir / (SS(fs)/32); /* Data start sector (lba) */
735  
736 #if !_FS_READONLY
737 /* Initialize allocation information */
738 fs->free_clust = 0xFFFFFFFF;
739 #if _USE_FSINFO
740 /* Get fsinfo if needed */
741 if (fmt == FS_FAT32) {
742 fs->fsi_sector = bootsect + LD_WORD(&fs->win[BPB_FSInfo]);
743 if (disk_read(fs->drive, fs->win, fs->fsi_sector, 1) == RES_OK &&
744 LD_WORD(&fs->win[BS_55AA]) == 0xAA55 &&
745 LD_DWORD(&fs->win[FSI_LeadSig]) == 0x41615252 &&
746 LD_DWORD(&fs->win[FSI_StrucSig]) == 0x61417272) {
747 fs->last_clust = LD_DWORD(&fs->win[FSI_Nxt_Free]);
748 fs->free_clust = LD_DWORD(&fs->win[FSI_Free_Count]);
749 }
750 }
751 #endif
752 #endif
753  
754 fs->fs_type = fmt; /* FAT syb-type */
755 fs->id = ++fsid; /* File system mount ID */
756 return FR_OK;
757 }
758  
759  
760  
761  
762 /*-----------------------------------------------------------------------*/
763 /* Check if the file/dir object is valid or not */
764 /*-----------------------------------------------------------------------*/
765  
766 static
767 FRESULT validate ( /* FR_OK(0): The object is valid, !=0: Invalid */
768 const FATFS *fs, /* Pointer to the file system object */
769 WORD id /* Member id of the target object to be checked */
770 )
771 {
772 if (!fs || !fs->fs_type || fs->id != id)
773 return FR_INVALID_OBJECT;
774 if (disk_status(fs->drive) & STA_NOINIT)
775 return FR_NOT_READY;
776  
777 return FR_OK;
778 }
779  
780  
781  
782  
783 /*--------------------------------------------------------------------------
784  
785 Public Functions
786  
787 --------------------------------------------------------------------------*/
788  
789  
790  
791 /*-----------------------------------------------------------------------*/
792 /* Mount/Unmount a Locical Drive */
793 /*-----------------------------------------------------------------------*/
794  
795 FRESULT f_mount (
796 BYTE drv, /* Logical drive number to be mounted/unmounted */
797 FATFS *fs /* Pointer to new file system object (NULL for unmount)*/
798 )
799 {
800 if (drv >= _DRIVES) return FR_INVALID_DRIVE;
801  
802 if (FatFs[drv]) FatFs[drv]->fs_type = 0; /* Clear old object */
803  
804 FatFs[drv] = fs; /* Register and clear new object */
805 if (fs) fs->fs_type = 0;
806  
807 return FR_OK;
808 }
809  
810  
811  
812  
813 /*-----------------------------------------------------------------------*/
814 /* Open or Create a File */
815 /*-----------------------------------------------------------------------*/
816  
817 FRESULT f_open (
818 FIL *fp, /* Pointer to the blank file object */
819 const char *path, /* Pointer to the file name */
820 BYTE mode /* Access mode and file open mode flags */
821 )
822 {
823 FRESULT res;
824 DIR dj;
825 BYTE *dir;
826 char fn[8+3+1];
827  
828  
829 fp->fs = NULL; /* Clear file object */
830 #if !_FS_READONLY
831 mode &= (FA_READ|FA_WRITE|FA_CREATE_ALWAYS|FA_OPEN_ALWAYS|FA_CREATE_NEW);
832 res = auto_mount(&path, &dj.fs, (BYTE)(mode & (FA_WRITE|FA_CREATE_ALWAYS|FA_OPEN_ALWAYS|FA_CREATE_NEW)));
833 #else
834 mode &= FA_READ;
835 res = auto_mount(&path, &dj.fs, 0);
836 #endif
837 if (res != FR_OK) return res;
838 res = trace_path(&dj, fn, path, &dir); /* Trace the file path */
839  
840 #if !_FS_READONLY
841 /* Create or Open a file */
842 if (mode & (FA_CREATE_ALWAYS|FA_OPEN_ALWAYS|FA_CREATE_NEW)) {
843 DWORD ps, rs;
844 if (res != FR_OK) { /* No file, create new */
845 if (res != FR_NO_FILE) return res;
846 res = reserve_direntry(&dj, &dir);
847 if (res != FR_OK) return res;
848 memset(dir, 0, 32); /* Initialize the new entry with open name */
849 memcpy(&dir[DIR_Name], fn, 8+3);
850 dir[DIR_NTres] = fn[11];
851 mode |= FA_CREATE_ALWAYS;
852 }
853 else { /* Any object is already existing */
854 if (mode & FA_CREATE_NEW) /* Cannot create new */
855 return FR_EXIST;
856 if (!dir || (dir[DIR_Attr] & (AM_RDO|AM_DIR))) /* Cannot overwrite it (R/O or DIR) */
857 return FR_DENIED;
858 if (mode & FA_CREATE_ALWAYS) { /* Resize it to zero if needed */
859 rs = ((DWORD)LD_WORD(&dir[DIR_FstClusHI]) << 16) | LD_WORD(&dir[DIR_FstClusLO]); /* Get start cluster */
860 ST_WORD(&dir[DIR_FstClusHI], 0); /* cluster = 0 */
861 ST_WORD(&dir[DIR_FstClusLO], 0);
862 ST_DWORD(&dir[DIR_FileSize], 0); /* size = 0 */
863 dj.fs->winflag = 1;
864 ps = dj.fs->winsect; /* Remove the cluster chain */
865 if (!remove_chain(dj.fs, rs) || !move_window(dj.fs, ps))
866 return FR_RW_ERROR;
867 dj.fs->last_clust = rs - 1; /* Reuse the cluster hole */
868 }
869 }
870 if (mode & FA_CREATE_ALWAYS) {
871 dir[DIR_Attr] = 0; /* Reset attribute */
872 ps = get_fattime();
873 ST_DWORD(&dir[DIR_CrtTime], ps); /* Created time */
874 dj.fs->winflag = 1;
875 mode |= FA__WRITTEN; /* Set file changed flag */
876 }
877 }
878 /* Open an existing file */
879 else {
880 #endif /* !_FS_READONLY */
881 if (res != FR_OK) return res; /* Trace failed */
882 if (!dir || (dir[DIR_Attr] & AM_DIR)) /* It is a directory */
883 return FR_NO_FILE;
884 #if !_FS_READONLY
885 if ((mode & FA_WRITE) && (dir[DIR_Attr] & AM_RDO)) /* R/O violation */
886 return FR_DENIED;
887 }
888 fp->dir_sect = dj.fs->winsect; /* Pointer to the directory entry */
889 fp->dir_ptr = dir;
890 #endif
891 fp->flag = mode; /* File access mode */
892 fp->org_clust = /* File start cluster */
893 ((DWORD)LD_WORD(&dir[DIR_FstClusHI]) << 16) | LD_WORD(&dir[DIR_FstClusLO]);
894 fp->fsize = LD_DWORD(&dir[DIR_FileSize]); /* File size */
895 fp->fptr = 0; fp->csect = 255; /* File pointer */
896 fp->curr_sect = 0;
897 fp->fs = dj.fs; fp->id = dj.fs->id; /* Owner file system object of the file */
898  
899 return FR_OK;
900 }
901  
902  
903  
904  
905 /*-----------------------------------------------------------------------*/
906 /* Read File */
907 /*-----------------------------------------------------------------------*/
908  
909 FRESULT f_read (
910 FIL *fp, /* Pointer to the file object */
911 void *buff, /* Pointer to data buffer */
912 UINT btr, /* Number of bytes to read */
913 UINT *br /* Pointer to number of bytes read */
914 )
915 {
916 FRESULT res;
917 DWORD clust, sect, remain;
918 UINT rcnt, cc;
919 BYTE *rbuff = buff;
920  
921  
922 *br = 0;
923 res = validate(fp->fs, fp->id); /* Check validity of the object */
924 if (res != FR_OK) return res;
925 if (fp->flag & FA__ERROR) return FR_RW_ERROR; /* Check error flag */
926 if (!(fp->flag & FA_READ)) return FR_DENIED; /* Check access mode */
927 remain = fp->fsize - fp->fptr;
928 if (btr > remain) btr = (UINT)remain; /* Truncate btr by remaining bytes */
929  
930 for ( ; btr; /* Repeat until all data transferred */
931 rbuff += rcnt, fp->fptr += rcnt, *br += rcnt, btr -= rcnt) {
932 if ((fp->fptr % SS(fp->fs)) == 0) { /* On the sector boundary? */
933 if (fp->csect >= fp->fs->csize) { /* On the cluster boundary? */
934 clust = (fp->fptr == 0) ? /* On the top of the file? */
935 fp->org_clust : get_cluster(fp->fs, fp->curr_clust);
936 if (clust < 2 || clust >= fp->fs->max_clust) goto fr_error;
937 fp->curr_clust = clust; /* Update current cluster */
938 fp->csect = 0; /* Reset sector address in the cluster */
939 }
940 sect = clust2sect(fp->fs, fp->curr_clust) + fp->csect; /* Get current sector */
941 cc = btr / SS(fp->fs); /* When remaining bytes >= sector size, */
942 if (cc) { /* Read maximum contiguous sectors directly */
943 if (fp->csect + cc > fp->fs->csize) /* Clip at cluster boundary */
944 cc = fp->fs->csize - fp->csect;
945 if (disk_read(fp->fs->drive, rbuff, sect, (BYTE)cc) != RES_OK)
946 goto fr_error;
947 fp->csect += (BYTE)cc; /* Next sector address in the cluster */
948 rcnt = SS(fp->fs) * cc; /* Number of bytes transferred */
949 continue;
950 }
951 if (sect != fp->curr_sect) { /* Is window offset changed? */
952 #if !_FS_READONLY
953 if (fp->flag & FA__DIRTY) { /* Write back file I/O buffer if needed */
954 if (disk_write(fp->fs->drive, fp->buffer, fp->curr_sect, 1) != RES_OK)
955 goto fr_error;
956 fp->flag &= (BYTE)~FA__DIRTY;
957 }
958 #endif
959 if (disk_read(fp->fs->drive, fp->buffer, sect, 1) != RES_OK) /* Fill file I/O buffer with file data */
960 goto fr_error;
961 fp->curr_sect = sect;
962 }
963 fp->csect++; /* Next sector address in the cluster */
964 }
965 rcnt = SS(fp->fs) - (fp->fptr % SS(fp->fs)); /* Get partial sector from file I/O buffer */
966 if (rcnt > btr) rcnt = btr;
967 memcpy(rbuff, &fp->buffer[fp->fptr % SS(fp->fs)], rcnt);
968 }
969  
970 return FR_OK;
971  
972 fr_error: /* Abort this file due to an unrecoverable error */
973 fp->flag |= FA__ERROR;
974 return FR_RW_ERROR;
975 }
976  
977  
978  
979  
980 #if !_FS_READONLY
981 /*-----------------------------------------------------------------------*/
982 /* Write File */
983 /*-----------------------------------------------------------------------*/
984  
985 FRESULT f_write (
986 FIL *fp, /* Pointer to the file object */
987 const void *buff, /* Pointer to the data to be written */
988 UINT btw, /* Number of bytes to write */
989 UINT *bw /* Pointer to number of bytes written */
990 )
991 {
992 FRESULT res;
993 DWORD clust, sect;
994 UINT wcnt, cc;
995 const BYTE *wbuff = buff;
996  
997  
998 *bw = 0;
999 res = validate(fp->fs, fp->id); /* Check validity of the object */
1000 if (res != FR_OK) return res;
1001 if (fp->flag & FA__ERROR) return FR_RW_ERROR; /* Check error flag */
1002 if (!(fp->flag & FA_WRITE)) return FR_DENIED; /* Check access mode */
1003 if (fp->fsize + btw < fp->fsize) return FR_OK; /* File size cannot reach 4GB */
1004  
1005 for ( ; btw; /* Repeat until all data transferred */
1006 wbuff += wcnt, fp->fptr += wcnt, *bw += wcnt, btw -= wcnt) {
1007 if ((fp->fptr % SS(fp->fs)) == 0) { /* On the sector boundary? */
1008 if (fp->csect >= fp->fs->csize) { /* On the cluster boundary? */
1009 if (fp->fptr == 0) { /* On the top of the file? */
1010 clust = fp->org_clust; /* Follow from the origin */
1011 if (clust == 0) /* When there is no cluster chain, */
1012 fp->org_clust = clust = create_chain(fp->fs, 0); /* Create a new cluster chain */
1013 } else { /* Middle or end of the file */
1014 clust = create_chain(fp->fs, fp->curr_clust); /* Trace or streach cluster chain */
1015 }
1016 if (clust == 0) break; /* Could not allocate a new cluster (disk full) */
1017 if (clust == 1 || clust >= fp->fs->max_clust) goto fw_error;
1018 fp->curr_clust = clust; /* Update current cluster */
1019 fp->csect = 0; /* Reset sector address in the cluster */
1020 }
1021 sect = clust2sect(fp->fs, fp->curr_clust) + fp->csect; /* Get current sector */
1022 cc = btw / SS(fp->fs); /* When remaining bytes >= sector size, */
1023 if (cc) { /* Write maximum contiguous sectors directly */
1024 if (fp->csect + cc > fp->fs->csize) /* Clip at cluster boundary */
1025 cc = fp->fs->csize - fp->csect;
1026 if (disk_write(fp->fs->drive, wbuff, sect, (BYTE)cc) != RES_OK)
1027 goto fw_error;
1028 fp->csect += (BYTE)cc; /* Next sector address in the cluster */
1029 wcnt = SS(fp->fs) * cc; /* Number of bytes transferred */
1030 continue;
1031 }
1032 if (sect != fp->curr_sect) { /* Is window offset changed? */
1033 if (fp->flag & FA__DIRTY) { /* Write back file I/O buffer if needed */
1034 if (disk_write(fp->fs->drive, fp->buffer, fp->curr_sect, 1) != RES_OK)
1035 goto fw_error;
1036 fp->flag &= (BYTE)~FA__DIRTY;
1037 }
1038 if (fp->fptr < fp->fsize && /* Fill file I/O buffer with file data */
1039 disk_read(fp->fs->drive, fp->buffer, sect, 1) != RES_OK)
1040 goto fw_error;
1041 fp->curr_sect = sect;
1042 }
1043 fp->csect++; /* Next sector address in the cluster */
1044 }
1045 wcnt = SS(fp->fs) - (fp->fptr % SS(fp->fs)); /* Put partial sector into file I/O buffer */
1046 if (wcnt > btw) wcnt = btw;
1047 memcpy(&fp->buffer[fp->fptr % SS(fp->fs)], wbuff, wcnt);
1048 fp->flag |= FA__DIRTY;
1049 }
1050  
1051 if (fp->fptr > fp->fsize) fp->fsize = fp->fptr; /* Update file size if needed */
1052 fp->flag |= FA__WRITTEN; /* Set file changed flag */
1053 return FR_OK;
1054  
1055 fw_error: /* Abort this file due to an unrecoverable error */
1056 fp->flag |= FA__ERROR;
1057 return FR_RW_ERROR;
1058 }
1059  
1060  
1061  
1062  
1063 /*-----------------------------------------------------------------------*/
1064 /* Synchronize the file object */
1065 /*-----------------------------------------------------------------------*/
1066  
1067 FRESULT f_sync (
1068 FIL *fp /* Pointer to the file object */
1069 )
1070 {
1071 FRESULT res;
1072 DWORD tim;
1073 BYTE *dir;
1074  
1075  
1076 res = validate(fp->fs, fp->id); /* Check validity of the object */
1077 if (res == FR_OK) {
1078 if (fp->flag & FA__WRITTEN) { /* Has the file been written? */
1079 /* Write back data buffer if needed */
1080 if (fp->flag & FA__DIRTY) {
1081 if (disk_write(fp->fs->drive, fp->buffer, fp->curr_sect, 1) != RES_OK)
1082 return FR_RW_ERROR;
1083 fp->flag &= (BYTE)~FA__DIRTY;
1084 }
1085 /* Update the directory entry */
1086 if (!move_window(fp->fs, fp->dir_sect))
1087 return FR_RW_ERROR;
1088 dir = fp->dir_ptr;
1089 dir[DIR_Attr] |= AM_ARC; /* Set archive bit */
1090 ST_DWORD(&dir[DIR_FileSize], fp->fsize); /* Update file size */
1091 ST_WORD(&dir[DIR_FstClusLO], fp->org_clust); /* Update start cluster */
1092 ST_WORD(&dir[DIR_FstClusHI], fp->org_clust >> 16);
1093 tim = get_fattime(); /* Updated time */
1094 ST_DWORD(&dir[DIR_WrtTime], tim);
1095 fp->flag &= (BYTE)~FA__WRITTEN;
1096 res = sync(fp->fs);
1097 }
1098 }
1099 return res;
1100 }
1101  
1102 #endif /* !_FS_READONLY */
1103  
1104  
1105  
1106  
1107 /*-----------------------------------------------------------------------*/
1108 /* Close File */
1109 /*-----------------------------------------------------------------------*/
1110  
1111 FRESULT f_close (
1112 FIL *fp /* Pointer to the file object to be closed */
1113 )
1114 {
1115 FRESULT res;
1116  
1117  
1118 #if !_FS_READONLY
1119 res = f_sync(fp);
1120 #else
1121 res = validate(fp->fs, fp->id);
1122 #endif
1123 if (res == FR_OK) fp->fs = NULL;
1124 return res;
1125 }
1126  
1127  
1128  
1129  
1130 #if _FS_MINIMIZE <= 2
1131 /*-----------------------------------------------------------------------*/
1132 /* Seek File R/W Pointer */
1133 /*-----------------------------------------------------------------------*/
1134  
1135 FRESULT f_lseek (
1136 FIL *fp, /* Pointer to the file object */
1137 DWORD ofs /* File pointer from top of file */
1138 )
1139 {
1140 FRESULT res;
1141 DWORD clust, csize, nsect, ifptr;
1142  
1143  
1144 res = validate(fp->fs, fp->id); /* Check validity of the object */
1145 if (res != FR_OK) return res;
1146 if (fp->flag & FA__ERROR) return FR_RW_ERROR;
1147 if (ofs > fp->fsize /* In read-only mode, clip offset with the file size */
1148 #if !_FS_READONLY
1149 && !(fp->flag & FA_WRITE)
1150 #endif
1151 ) ofs = fp->fsize;
1152  
1153 ifptr = fp->fptr;
1154 fp->fptr = 0; fp->csect = 255;
1155 nsect = 0;
1156 if (ofs > 0) {
1157 csize = (DWORD)fp->fs->csize * SS(fp->fs); /* Cluster size (byte) */
1158 if (ifptr > 0 &&
1159 (ofs - 1) / csize >= (ifptr - 1) / csize) {/* When seek to same or following cluster, */
1160 fp->fptr = (ifptr - 1) & ~(csize - 1); /* start from the current cluster */
1161 ofs -= fp->fptr;
1162 clust = fp->curr_clust;
1163 } else { /* When seek to back cluster, */
1164 clust = fp->org_clust; /* start from the first cluster */
1165 #if !_FS_READONLY
1166 if (clust == 0) { /* If no cluster chain, create a new chain */
1167 clust = create_chain(fp->fs, 0);
1168 if (clust == 1) goto fk_error;
1169 fp->org_clust = clust;
1170 }
1171 #endif
1172 fp->curr_clust = clust;
1173 }
1174 if (clust != 0) {
1175 while (ofs > csize) { /* Cluster following loop */
1176 #if !_FS_READONLY
1177 if (fp->flag & FA_WRITE) { /* Check if in write mode or not */
1178 clust = create_chain(fp->fs, clust); /* Force streached if in write mode */
1179 if (clust == 0) { /* When disk gets full, clip file size */
1180 ofs = csize; break;
1181 }
1182 } else
1183 #endif
1184 clust = get_cluster(fp->fs, clust); /* Follow cluster chain if not in write mode */
1185 if (clust < 2 || clust >= fp->fs->max_clust) goto fk_error;
1186 fp->curr_clust = clust;
1187 fp->fptr += csize;
1188 ofs -= csize;
1189 }
1190 fp->fptr += ofs;
1191 fp->csect = (BYTE)(ofs / SS(fp->fs)); /* Sector offset in the cluster */
1192 if (ofs & (SS(fp->fs) - 1)) {
1193 nsect = clust2sect(fp->fs, clust) + fp->csect; /* Current sector */
1194 fp->csect++;
1195 }
1196 }
1197 }
1198 if (nsect && nsect != fp->curr_sect) {
1199 #if !_FS_READONLY
1200 if (fp->flag & FA__DIRTY) { /* Write-back dirty buffer if needed */
1201 if (disk_write(fp->fs->drive, fp->buffer, fp->curr_sect, 1) != RES_OK)
1202 goto fk_error;
1203 fp->flag &= (BYTE)~FA__DIRTY;
1204 }
1205 #endif
1206 if (disk_read(fp->fs->drive, fp->buffer, nsect, 1) != RES_OK)
1207 goto fk_error;
1208 fp->curr_sect = nsect;
1209 }
1210  
1211 #if !_FS_READONLY
1212 if (fp->fptr > fp->fsize) { /* Set changed flag if the file was extended */
1213 fp->fsize = fp->fptr;
1214 fp->flag |= FA__WRITTEN;
1215 }
1216 #endif
1217  
1218 return FR_OK;
1219  
1220 fk_error: /* Abort this file due to an unrecoverable error */
1221 fp->flag |= FA__ERROR;
1222 return FR_RW_ERROR;
1223 }
1224  
1225  
1226  
1227  
1228 #if _FS_MINIMIZE <= 1
1229 /*-----------------------------------------------------------------------*/
1230 /* Create a directroy object */
1231 /*-----------------------------------------------------------------------*/
1232  
1233 FRESULT f_opendir (
1234 DIR *dj, /* Pointer to directory object to create */
1235 const char *path /* Pointer to the directory path */
1236 )
1237 {
1238 FRESULT res;
1239 BYTE *dir;
1240 char fn[8+3+1];
1241  
1242  
1243 res = auto_mount(&path, &dj->fs, 0);
1244 if (res == FR_OK) {
1245 res = trace_path(dj, fn, path, &dir); /* Trace the directory path */
1246 if (res == FR_OK) { /* Trace completed */
1247 if (dir) { /* It is not the root dir */
1248 if (dir[DIR_Attr] & AM_DIR) { /* The entry is a directory */
1249 dj->clust = ((DWORD)LD_WORD(&dir[DIR_FstClusHI]) << 16) | LD_WORD(&dir[DIR_FstClusLO]);
1250 dj->sect = clust2sect(dj->fs, dj->clust);
1251 dj->index = 2;
1252 } else { /* The entry is not a directory */
1253 res = FR_NO_FILE;
1254 }
1255 }
1256 dj->id = dj->fs->id;
1257 }
1258 }
1259  
1260 return res;
1261 }
1262  
1263  
1264  
1265  
1266 /*-----------------------------------------------------------------------*/
1267 /* Read Directory Entry in Sequense */
1268 /*-----------------------------------------------------------------------*/
1269  
1270 FRESULT f_readdir (
1271 DIR *dj, /* Pointer to the directory object */
1272 FILINFO *finfo /* Pointer to file information to return */
1273 )
1274 {
1275 BYTE *dir, c, res;
1276  
1277  
1278 res = validate(dj->fs, dj->id); /* Check validity of the object */
1279 if (res != FR_OK) return res;
1280  
1281 finfo->fname[0] = 0;
1282 while (dj->sect) {
1283 if (!move_window(dj->fs, dj->sect))
1284 return FR_RW_ERROR;
1285 dir = &dj->fs->win[(dj->index & ((SS(dj->fs) - 1) >> 5)) * 32]; /* pointer to the directory entry */
1286 c = dir[DIR_Name];
1287 if (c == 0) break; /* Has it reached to end of dir? */
1288 if (c != 0xE5 && !(dir[DIR_Attr] & AM_VOL)) /* Is it a valid entry? */
1289 get_fileinfo(finfo, dir);
1290 if (!next_dir_entry(dj)) dj->sect = 0; /* Next entry */
1291 if (finfo->fname[0]) break; /* Found valid entry */
1292 }
1293  
1294 return FR_OK;
1295 }
1296  
1297  
1298  
1299  
1300 #if _FS_MINIMIZE == 0
1301 /*-----------------------------------------------------------------------*/
1302 /* Get File Status */
1303 /*-----------------------------------------------------------------------*/
1304  
1305 FRESULT f_stat (
1306 const char *path, /* Pointer to the file path */
1307 FILINFO *finfo /* Pointer to file information to return */
1308 )
1309 {
1310 FRESULT res;
1311 DIR dj;
1312 BYTE *dir;
1313 char fn[8+3+1];
1314  
1315  
1316 res = auto_mount(&path, &dj.fs, 0);
1317 if (res == FR_OK) {
1318 res = trace_path(&dj, fn, path, &dir); /* Trace the file path */
1319 if (res == FR_OK) { /* Trace completed */
1320 if (dir) /* Found an object */
1321 get_fileinfo(finfo, dir);
1322 else /* It is root dir */
1323 res = FR_INVALID_NAME;
1324 }
1325 }
1326  
1327 return res;
1328 }
1329  
1330  
1331  
1332 #if !_FS_READONLY
1333 /*-----------------------------------------------------------------------*/
1334 /* Truncate File */
1335 /*-----------------------------------------------------------------------*/
1336  
1337 FRESULT f_truncate (
1338 FIL *fp /* Pointer to the file object */
1339 )
1340 {
1341 FRESULT res;
1342 DWORD ncl;
1343  
1344  
1345 res = validate(fp->fs, fp->id); /* Check validity of the object */
1346 if (res != FR_OK) return res;
1347 if (fp->flag & FA__ERROR) return FR_RW_ERROR; /* Check error flag */
1348 if (!(fp->flag & FA_WRITE)) return FR_DENIED; /* Check access mode */
1349  
1350 if (fp->fsize > fp->fptr) {
1351 fp->fsize = fp->fptr; /* Set file size to current R/W point */
1352 fp->flag |= FA__WRITTEN;
1353 if (fp->fptr == 0) { /* When set file size to zero, remove entire cluster chain */
1354 if (!remove_chain(fp->fs, fp->org_clust)) goto ft_error;
1355 fp->org_clust = 0;
1356 } else { /* When truncate a part of the file, remove remaining clusters */
1357 ncl = get_cluster(fp->fs, fp->curr_clust);
1358 if (ncl < 2) goto ft_error;
1359 if (ncl < fp->fs->max_clust) {
1360 if (!put_cluster(fp->fs, fp->curr_clust, 0x0FFFFFFF)) goto ft_error;
1361 if (!remove_chain(fp->fs, ncl)) goto ft_error;
1362 }
1363 }
1364 }
1365  
1366 return FR_OK;
1367  
1368 ft_error: /* Abort this file due to an unrecoverable error */
1369 fp->flag |= FA__ERROR;
1370 return FR_RW_ERROR;
1371 }
1372  
1373  
1374  
1375  
1376 /*-----------------------------------------------------------------------*/
1377 /* Get Number of Free Clusters */
1378 /*-----------------------------------------------------------------------*/
1379  
1380 FRESULT f_getfree (
1381 const char *drv, /* Pointer to the logical drive number (root dir) */
1382 DWORD *nclust, /* Pointer to the variable to return number of free clusters */
1383 FATFS **fatfs /* Pointer to pointer to corresponding file system object to return */
1384 )
1385 {
1386 FRESULT res;
1387 DWORD n, clust, sect;
1388 BYTE fat, f, *p;
1389  
1390  
1391 /* Get drive number */
1392 res = auto_mount(&drv, fatfs, 0);
1393 if (res != FR_OK) return res;
1394  
1395 /* If number of free cluster is valid, return it without cluster scan. */
1396 if ((*fatfs)->free_clust <= (*fatfs)->max_clust - 2) {
1397 *nclust = (*fatfs)->free_clust;
1398 return FR_OK;
1399 }
1400  
1401 /* Get number of free clusters */
1402 fat = (*fatfs)->fs_type;
1403 n = 0;
1404 if (fat == FS_FAT12) {
1405 clust = 2;
1406 do {
1407 if ((WORD)get_cluster(*fatfs, clust) == 0) n++;
1408 } while (++clust < (*fatfs)->max_clust);
1409 } else {
1410 clust = (*fatfs)->max_clust;
1411 sect = (*fatfs)->fatbase;
1412 f = 0; p = 0;
1413 do {
1414 if (!f) {
1415 if (!move_window(*fatfs, sect++)) return FR_RW_ERROR;
1416 p = (*fatfs)->win;
1417 }
1418 if (fat == FS_FAT16) {
1419 if (LD_WORD(p) == 0) n++;
1420 p += 2; f += 1;
1421 } else {
1422 if (LD_DWORD(p) == 0) n++;
1423 p += 4; f += 2;
1424 }
1425 } while (--clust);
1426 }
1427 (*fatfs)->free_clust = n;
1428 #if _USE_FSINFO
1429 if (fat == FS_FAT32) (*fatfs)->fsi_flag = 1;
1430 #endif
1431  
1432 *nclust = n;
1433 return FR_OK;
1434 }
1435  
1436  
1437  
1438  
1439 /*-----------------------------------------------------------------------*/
1440 /* Delete a File or Directory */
1441 /*-----------------------------------------------------------------------*/
1442  
1443 FRESULT f_unlink (
1444 const char *path /* Pointer to the file or directory path */
1445 )
1446 {
1447 FRESULT res;
1448 DIR dj;
1449 BYTE *dir, *sdir;
1450 DWORD dclust, dsect;
1451 char fn[8+3+1];
1452  
1453  
1454 res = auto_mount(&path, &dj.fs, 1);
1455 if (res != FR_OK) return res;
1456 res = trace_path(&dj, fn, path, &dir); /* Trace the file path */
1457 if (res != FR_OK) return res; /* Trace failed */
1458 if (!dir) return FR_INVALID_NAME; /* It is the root directory */
1459 if (dir[DIR_Attr] & AM_RDO) return FR_DENIED; /* It is a R/O object */
1460 dsect = dj.fs->winsect;
1461 dclust = ((DWORD)LD_WORD(&dir[DIR_FstClusHI]) << 16) | LD_WORD(&dir[DIR_FstClusLO]);
1462  
1463 if (dir[DIR_Attr] & AM_DIR) { /* It is a sub-directory */
1464 dj.clust = dclust; /* Check if the sub-dir is empty or not */
1465 dj.sect = clust2sect(dj.fs, dclust);
1466 dj.index = 2;
1467 do {
1468 if (!move_window(dj.fs, dj.sect)) return FR_RW_ERROR;
1469 sdir = &dj.fs->win[(dj.index & ((SS(dj.fs) - 1) >> 5)) * 32];
1470 if (sdir[DIR_Name] == 0) break;
1471 if (sdir[DIR_Name] != 0xE5 && !(sdir[DIR_Attr] & AM_VOL))
1472 return FR_DENIED; /* The directory is not empty */
1473 } while (next_dir_entry(&dj));
1474 }
1475  
1476 if (!move_window(dj.fs, dsect)) return FR_RW_ERROR; /* Mark the directory entry 'deleted' */
1477 dir[DIR_Name] = 0xE5;
1478 dj.fs->winflag = 1;
1479 if (!remove_chain(dj.fs, dclust)) return FR_RW_ERROR; /* Remove the cluster chain */
1480  
1481 return sync(dj.fs);
1482 }
1483  
1484  
1485  
1486  
1487 /*-----------------------------------------------------------------------*/
1488 /* Create a Directory */
1489 /*-----------------------------------------------------------------------*/
1490  
1491 FRESULT f_mkdir (
1492 const char *path /* Pointer to the directory path */
1493 )
1494 {
1495 FRESULT res;
1496 DIR dj;
1497 BYTE *dir, *fw, n;
1498 char fn[8+3+1];
1499 DWORD sect, dsect, dclust, pclust, tim;
1500  
1501  
1502 res = auto_mount(&path, &dj.fs, 1);
1503 if (res != FR_OK) return res;
1504 res = trace_path(&dj, fn, path, &dir); /* Trace the file path */
1505 if (res == FR_OK) return FR_EXIST; /* Any file or directory is already existing */
1506 if (res != FR_NO_FILE) return res;
1507  
1508 res = reserve_direntry(&dj, &dir); /* Reserve a directory entry */
1509 if (res != FR_OK) return res;
1510 sect = dj.fs->winsect;
1511 dclust = create_chain(dj.fs, 0); /* Allocate a cluster for new directory table */
1512 if (dclust == 1) return FR_RW_ERROR;
1513 dsect = clust2sect(dj.fs, dclust);
1514 if (!dsect) return FR_DENIED;
1515 if (!move_window(dj.fs, dsect)) return FR_RW_ERROR;
1516  
1517 fw = dj.fs->win;
1518 memset(fw, 0, SS(dj.fs)); /* Clear the new directory table */
1519 for (n = 1; n < dj.fs->csize; n++) {
1520 if (disk_write(dj.fs->drive, fw, ++dsect, 1) != RES_OK)
1521 return FR_RW_ERROR;
1522 }
1523 memset(&fw[DIR_Name], ' ', 8+3); /* Create "." entry */
1524 fw[DIR_Name] = '.';
1525 fw[DIR_Attr] = AM_DIR;
1526 tim = get_fattime();
1527 ST_DWORD(&fw[DIR_WrtTime], tim);
1528 memcpy(&fw[32], &fw[0], 32); fw[33] = '.'; /* Create ".." entry */
1529 ST_WORD(&fw[ DIR_FstClusLO], dclust);
1530 ST_WORD(&fw[ DIR_FstClusHI], dclust >> 16);
1531 pclust = dj.sclust;
1532 if (dj.fs->fs_type == FS_FAT32 && pclust == dj.fs->dirbase) pclust = 0;
1533 ST_WORD(&fw[32+DIR_FstClusLO], pclust);
1534 ST_WORD(&fw[32+DIR_FstClusHI], pclust >> 16);
1535 dj.fs->winflag = 1;
1536  
1537 if (!move_window(dj.fs, sect)) return FR_RW_ERROR;
1538 memset(&dir[0], 0, 32); /* Initialize the new entry */
1539 memcpy(&dir[DIR_Name], fn, 8+3); /* Name */
1540 dir[DIR_NTres] = fn[11];
1541 dir[DIR_Attr] = AM_DIR; /* Attribute */
1542 ST_DWORD(&dir[DIR_WrtTime], tim); /* Crated time */
1543 ST_WORD(&dir[DIR_FstClusLO], dclust); /* Table start cluster */
1544 ST_WORD(&dir[DIR_FstClusHI], dclust >> 16);
1545  
1546 return sync(dj.fs);
1547 }
1548  
1549  
1550  
1551  
1552 /*-----------------------------------------------------------------------*/
1553 /* Change File Attribute */
1554 /*-----------------------------------------------------------------------*/
1555  
1556 FRESULT f_chmod (
1557 const char *path, /* Pointer to the file path */
1558 BYTE value, /* Attribute bits */
1559 BYTE mask /* Attribute mask to change */
1560 )
1561 {
1562 FRESULT res;
1563 DIR dj;
1564 BYTE *dir;
1565 char fn[8+3+1];
1566  
1567  
1568 res = auto_mount(&path, &dj.fs, 1);
1569 if (res == FR_OK) {
1570 res = trace_path(&dj, fn, path, &dir); /* Trace the file path */
1571 if (res == FR_OK) { /* Trace completed */
1572 if (!dir) {
1573 res = FR_INVALID_NAME; /* Root directory */
1574 } else {
1575 mask &= AM_RDO|AM_HID|AM_SYS|AM_ARC; /* Valid attribute mask */
1576 dir[DIR_Attr] = (value & mask) | (dir[DIR_Attr] & (BYTE)~mask); /* Apply attribute change */
1577 res = sync(dj.fs);
1578 }
1579 }
1580 }
1581 return res;
1582 }
1583  
1584  
1585  
1586  
1587 /*-----------------------------------------------------------------------*/
1588 /* Change Timestamp */
1589 /*-----------------------------------------------------------------------*/
1590  
1591 FRESULT f_utime (
1592 const char *path, /* Pointer to the file/directory name */
1593 const FILINFO *finfo /* Pointer to the timestamp to be set */
1594 )
1595 {
1596 FRESULT res;
1597 DIR dj;
1598 BYTE *dir;
1599 char fn[8+3+1];
1600  
1601  
1602 res = auto_mount(&path, &dj.fs, 1);
1603 if (res == FR_OK) {
1604 res = trace_path(&dj, fn, path, &dir); /* Trace the file path */
1605 if (res == FR_OK) { /* Trace completed */
1606 if (!dir) {
1607 res = FR_INVALID_NAME; /* Root directory */
1608 } else {
1609 ST_WORD(&dir[DIR_WrtTime], finfo->ftime);
1610 ST_WORD(&dir[DIR_WrtDate], finfo->fdate);
1611 res = sync(dj.fs);
1612 }
1613 }
1614 }
1615 return res;
1616 }
1617  
1618  
1619  
1620  
1621 /*-----------------------------------------------------------------------*/
1622 /* Rename File/Directory */
1623 /*-----------------------------------------------------------------------*/
1624  
1625 FRESULT f_rename (
1626 const char *path_old, /* Pointer to the old name */
1627 const char *path_new /* Pointer to the new name */
1628 )
1629 {
1630 FRESULT res;
1631 DIR dj;
1632 DWORD sect_old;
1633 BYTE *dir_old, *dir_new, direntry[32-11];
1634 char fn[8+3+1];
1635  
1636  
1637 res = auto_mount(&path_old, &dj.fs, 1);
1638 if (res != FR_OK) return res;
1639  
1640 res = trace_path(&dj, fn, path_old, &dir_old); /* Check old object */
1641 if (res != FR_OK) return res; /* The old object is not found */
1642 if (!dir_old) return FR_NO_FILE;
1643 sect_old = dj.fs->winsect; /* Save the object information */
1644 memcpy(direntry, &dir_old[DIR_Attr], 32-11);
1645  
1646 res = trace_path(&dj, fn, path_new, &dir_new); /* Check new object */
1647 if (res == FR_OK) return FR_EXIST; /* The new object name is already existing */
1648 if (res != FR_NO_FILE) return res; /* Is there no old name? */
1649 res = reserve_direntry(&dj, &dir_new); /* Reserve a directory entry */
1650 if (res != FR_OK) return res;
1651  
1652 memcpy(&dir_new[DIR_Attr], direntry, 32-11); /* Create new entry */
1653 memcpy(&dir_new[DIR_Name], fn, 8+3);
1654 dir_new[DIR_NTres] = fn[11];
1655 dj.fs->winflag = 1;
1656  
1657 if (!move_window(dj.fs, sect_old)) return FR_RW_ERROR; /* Delete old entry */
1658 dir_old[DIR_Name] = 0xE5;
1659  
1660 return sync(dj.fs);
1661 }
1662  
1663 #endif /* !_FS_READONLY */
1664 #endif /* _FS_MINIMIZE == 0 */
1665 #endif /* _FS_MINIMIZE <= 1 */
1666 #endif /* _FS_MINIMIZE <= 2 */
1667  
1668  
1669  
1670 #if _USE_MKFS && !_FS_READONLY
1671 /*-----------------------------------------------------------------------*/
1672 /* Create File System on the Drive */
1673 /*-----------------------------------------------------------------------*/
1674 #define N_ROOTDIR 512 /* Multiple of 32 and <= 2048 */
1675 #define N_FATS 1 /* 1 or 2 */
1676 #define MAX_SECTOR 64000000UL /* Maximum partition size */
1677 #define MIN_SECTOR 2000UL /* Minimum partition size */
1678  
1679  
1680  
1681 FRESULT f_mkfs (
1682 BYTE drv, /* Logical drive number */
1683 BYTE partition, /* Partitioning rule 0:FDISK, 1:SFD */
1684 WORD allocsize /* Allocation unit size [bytes] */
1685 )
1686 {
1687 BYTE fmt, m, *tbl;
1688 DWORD b_part, b_fat, b_dir, b_data; /* Area offset (LBA) */
1689 DWORD n_part, n_rsv, n_fat, n_dir; /* Area size */
1690 DWORD n_clust, n;
1691 FATFS *fs;
1692 DSTATUS stat;
1693  
1694  
1695 /* Check validity of the parameters */
1696 if (drv >= _DRIVES) return FR_INVALID_DRIVE;
1697 if (partition >= 2) return FR_MKFS_ABORTED;
1698 for (n = 512; n <= 32768U && n != allocsize; n <<= 1);
1699 if (n != allocsize) return FR_MKFS_ABORTED;
1700  
1701 /* Check mounted drive and clear work area */
1702 fs = FatFs[drv];
1703 if (!fs) return FR_NOT_ENABLED;
1704 fs->fs_type = 0;
1705 drv = LD2PD(drv);
1706  
1707 /* Get disk statics */
1708 stat = disk_initialize(drv);
1709 if (stat & STA_NOINIT) return FR_NOT_READY;
1710 if (stat & STA_PROTECT) return FR_WRITE_PROTECTED;
1711 if (disk_ioctl(drv, GET_SECTOR_COUNT, &n_part) != RES_OK || n_part < MIN_SECTOR)
1712 return FR_MKFS_ABORTED;
1713 if (n_part > MAX_SECTOR) n_part = MAX_SECTOR;
1714 b_part = (!partition) ? 63 : 0; /* Boot sector */
1715 n_part -= b_part;
1716 #if S_MAX_SIZ > 512 /* Check disk sector size */
1717 if (disk_ioctl(drv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK
1718 || SS(fs) > S_MAX_SIZ
1719 || SS(fs) > allocsize)
1720 return FR_MKFS_ABORTED;
1721 #endif
1722 allocsize /= SS(fs); /* Number of sectors per cluster */
1723  
1724 /* Pre-compute number of clusters and FAT type */
1725 n_clust = n_part / allocsize;
1726 fmt = FS_FAT12;
1727 if (n_clust >= 0xFF5) fmt = FS_FAT16;
1728 if (n_clust >= 0xFFF5) fmt = FS_FAT32;
1729  
1730 /* Determine offset and size of FAT structure */
1731 switch (fmt) {
1732 case FS_FAT12:
1733 n_fat = ((n_clust * 3 + 1) / 2 + 3 + SS(fs) - 1) / SS(fs);
1734 n_rsv = 1 + partition;
1735 n_dir = N_ROOTDIR * 32 / SS(fs);
1736 break;
1737 case FS_FAT16:
1738 n_fat = ((n_clust * 2) + 4 + SS(fs) - 1) / SS(fs);
1739 n_rsv = 1 + partition;
1740 n_dir = N_ROOTDIR * 32 / SS(fs);
1741 break;
1742 default:
1743 n_fat = ((n_clust * 4) + 8 + SS(fs) - 1) / SS(fs);
1744 n_rsv = 33 - partition;
1745 n_dir = 0;
1746 }
1747 b_fat = b_part + n_rsv; /* FATs start sector */
1748 b_dir = b_fat + n_fat * N_FATS; /* Directory start sector */
1749 b_data = b_dir + n_dir; /* Data start sector */
1750  
1751 /* Align data start sector to erase block boundary (for flash memory media) */
1752 if (disk_ioctl(drv, GET_BLOCK_SIZE, &n) != RES_OK) return FR_MKFS_ABORTED;
1753 n = (b_data + n - 1) & ~(n - 1);
1754 n_fat += (n - b_data) / N_FATS;
1755 /* b_dir and b_data are no longer used below */
1756  
1757 /* Determine number of cluster and final check of validity of the FAT type */
1758 n_clust = (n_part - n_rsv - n_fat * N_FATS - n_dir) / allocsize;
1759 if ( (fmt == FS_FAT16 && n_clust < 0xFF5)
1760 || (fmt == FS_FAT32 && n_clust < 0xFFF5))
1761 return FR_MKFS_ABORTED;
1762  
1763 /* Create partition table if needed */
1764 if (!partition) {
1765 DWORD n_disk = b_part + n_part;
1766  
1767 tbl = &fs->win[MBR_Table];
1768 ST_DWORD(&tbl[0], 0x00010180); /* Partition start in CHS */
1769 if (n_disk < 63UL * 255 * 1024) { /* Partition end in CHS */
1770 n_disk = n_disk / 63 / 255;
1771 tbl[7] = (BYTE)n_disk;
1772 tbl[6] = (BYTE)((n_disk >> 2) | 63);
1773 } else {
1774 ST_WORD(&tbl[6], 0xFFFF);
1775 }
1776 tbl[5] = 254;
1777 if (fmt != FS_FAT32) /* System ID */
1778 tbl[4] = (n_part < 0x10000) ? 0x04 : 0x06;
1779 else
1780 tbl[4] = 0x0c;
1781 ST_DWORD(&tbl[8], 63); /* Partition start in LBA */
1782 ST_DWORD(&tbl[12], n_part); /* Partition size in LBA */
1783 ST_WORD(&tbl[64], 0xAA55); /* Signature */
1784 if (disk_write(drv, fs->win, 0, 1) != RES_OK)
1785 return FR_RW_ERROR;
1786 }
1787  
1788 /* Create boot record */
1789 tbl = fs->win; /* Clear buffer */
1790 memset(tbl, 0, SS(fs));
1791 ST_DWORD(&tbl[BS_jmpBoot], 0x90FEEB); /* Boot code (jmp $, nop) */
1792 ST_WORD(&tbl[BPB_BytsPerSec], SS(fs)); /* Sector size */
1793 tbl[BPB_SecPerClus] = (BYTE)allocsize; /* Sectors per cluster */
1794 ST_WORD(&tbl[BPB_RsvdSecCnt], n_rsv); /* Reserved sectors */
1795 tbl[BPB_NumFATs] = N_FATS; /* Number of FATs */
1796 ST_WORD(&tbl[BPB_RootEntCnt], SS(fs) / 32 * n_dir); /* Number of rootdir entries */
1797 if (n_part < 0x10000) { /* Number of total sectors */
1798 ST_WORD(&tbl[BPB_TotSec16], n_part);
1799 } else {
1800 ST_DWORD(&tbl[BPB_TotSec32], n_part);
1801 }
1802 tbl[BPB_Media] = 0xF8; /* Media descripter */
1803 ST_WORD(&tbl[BPB_SecPerTrk], 63); /* Number of sectors per track */
1804 ST_WORD(&tbl[BPB_NumHeads], 255); /* Number of heads */
1805 ST_DWORD(&tbl[BPB_HiddSec], b_part); /* Hidden sectors */
1806 n = get_fattime(); /* Use current time as a VSN */
1807 if (fmt != FS_FAT32) {
1808 ST_DWORD(&tbl[BS_VolID], n); /* Volume serial number */
1809 ST_WORD(&tbl[BPB_FATSz16], n_fat); /* Number of secters per FAT */
1810 tbl[BS_DrvNum] = 0x80; /* Drive number */
1811 tbl[BS_BootSig] = 0x29; /* Extended boot signature */
1812 memcpy(&tbl[BS_VolLab], "NO NAME FAT ", 19); /* Volume lavel, FAT signature */
1813 } else {
1814 ST_DWORD(&tbl[BS_VolID32], n); /* Volume serial number */
1815 ST_DWORD(&tbl[BPB_FATSz32], n_fat); /* Number of secters per FAT */
1816 ST_DWORD(&tbl[BPB_RootClus], 2); /* Root directory cluster (2) */
1817 ST_WORD(&tbl[BPB_FSInfo], 1); /* FSInfo record (bs+1) */
1818 ST_WORD(&tbl[BPB_BkBootSec], 6); /* Backup boot record (bs+6) */
1819 tbl[BS_DrvNum32] = 0x80; /* Drive number */
1820 tbl[BS_BootSig32] = 0x29; /* Extended boot signature */
1821 memcpy(&tbl[BS_VolLab32], "NO NAME FAT32 ", 19); /* Volume lavel, FAT signature */
1822 }
1823 ST_WORD(&tbl[BS_55AA], 0xAA55); /* Signature */
1824 if (disk_write(drv, tbl, b_part+0, 1) != RES_OK)
1825 return FR_RW_ERROR;
1826 if (fmt == FS_FAT32)
1827 disk_write(drv, tbl, b_part+6, 1);
1828  
1829 /* Initialize FAT area */
1830 for (m = 0; m < N_FATS; m++) {
1831 memset(tbl, 0, SS(fs)); /* 1st sector of the FAT */
1832 if (fmt != FS_FAT32) {
1833 n = (fmt == FS_FAT12) ? 0x00FFFFF8 : 0xFFFFFFF8;
1834 ST_DWORD(&tbl[0], n); /* Reserve cluster #0-1 (FAT12/16) */
1835 } else {
1836 ST_DWORD(&tbl[0], 0xFFFFFFF8); /* Reserve cluster #0-1 (FAT32) */
1837 ST_DWORD(&tbl[4], 0xFFFFFFFF);
1838 ST_DWORD(&tbl[8], 0x0FFFFFFF); /* Reserve cluster #2 for root dir */
1839 }
1840 if (disk_write(drv, tbl, b_fat++, 1) != RES_OK)
1841 return FR_RW_ERROR;
1842 memset(tbl, 0, SS(fs)); /* Following FAT entries are filled by zero */
1843 for (n = 1; n < n_fat; n++) {
1844 if (disk_write(drv, tbl, b_fat++, 1) != RES_OK)
1845 return FR_RW_ERROR;
1846 }
1847 }
1848  
1849 /* Initialize Root directory */
1850 m = (BYTE)((fmt == FS_FAT32) ? allocsize : n_dir);
1851 do {
1852 if (disk_write(drv, tbl, b_fat++, 1) != RES_OK)
1853 return FR_RW_ERROR;
1854 } while (--m);
1855  
1856 /* Create FSInfo record if needed */
1857 if (fmt == FS_FAT32) {
1858 ST_WORD(&tbl[BS_55AA], 0xAA55);
1859 ST_DWORD(&tbl[FSI_LeadSig], 0x41615252);
1860 ST_DWORD(&tbl[FSI_StrucSig], 0x61417272);
1861 ST_DWORD(&tbl[FSI_Free_Count], n_clust - 1);
1862 ST_DWORD(&tbl[FSI_Nxt_Free], 0xFFFFFFFF);
1863 disk_write(drv, tbl, b_part+1, 1);
1864 disk_write(drv, tbl, b_part+7, 1);
1865 }
1866  
1867 return (disk_ioctl(drv, CTRL_SYNC, NULL) == RES_OK) ? FR_OK : FR_RW_ERROR;
1868 }
1869  
1870 #endif /* _USE_MKFS && !_FS_READONLY */
1871  
1872  
1873  
1874  
1875 #if _USE_STRFUNC >= 1
1876 /*-----------------------------------------------------------------------*/
1877 /* Get a string from the file */
1878 /*-----------------------------------------------------------------------*/
1879 char* fgets (
1880 char* buff, /* Pointer to the string buffer to read */
1881 int len, /* Size of string buffer */
1882 FIL* fil /* Pointer to the file object */
1883 )
1884 {
1885 int i = 0;
1886 char *p = buff;
1887 UINT rc;
1888  
1889  
1890 while (i < len - 1) { /* Read bytes until buffer gets filled */
1891 f_read(fil, p, 1, &rc);
1892 if (rc != 1) break; /* Break when no data to read */
1893 #if _USE_STRFUNC >= 2
1894 if (*p == '\r') continue; /* Strip '\r' */
1895 #endif
1896 i++;
1897 if (*p++ == '\n') break; /* Break when reached end of line */
1898 }
1899 *p = 0;
1900 return i ? buff : 0; /* When no data read (eof or error), return with error. */
1901 }
1902  
1903  
1904  
1905 #if !_FS_READONLY
1906 #include <stdarg.h>
1907 /*-----------------------------------------------------------------------*/
1908 /* Put a character to the file */
1909 /*-----------------------------------------------------------------------*/
1910 int fputc (
1911 int chr, /* A character to be output */
1912 FIL* fil /* Ponter to the file object */
1913 )
1914 {
1915 UINT bw;
1916 char c;
1917  
1918  
1919 #if _USE_STRFUNC >= 2
1920 if (chr == '\n') fputc ('\r', fil); /* LF -> CRLF conversion */
1921 #endif
1922 if (!fil) { /* Special value may be used to switch the destination to any other device */
1923 /* put_console(chr); */
1924 return chr;
1925 }
1926 c = (char)chr;
1927 f_write(fil, &c, 1, &bw); /* Write a byte to the file */
1928 return bw ? chr : EOF; /* Return the resulut */
1929 }
1930  
1931  
1932  
1933  
1934 /*-----------------------------------------------------------------------*/
1935 /* Put a string to the file */
1936 /*-----------------------------------------------------------------------*/
1937 int fputs (
1938 const char* str, /* Pointer to the string to be output */
1939 FIL* fil /* Pointer to the file object */
1940 )
1941 {
1942 int n;
1943  
1944  
1945 for (n = 0; *str; str++, n++) {
1946 if (fputc(*str, fil) == EOF) return EOF;
1947 }
1948 return n;
1949 }
1950  
1951  
1952  
1953  
1954 /*-----------------------------------------------------------------------*/
1955 /* Put a formatted string to the file */
1956 /*-----------------------------------------------------------------------*/
1957 int fprintf (
1958 FIL* fil, /* Pointer to the file object */
1959 const char* str, /* Pointer to the format string */
1960 ... /* Optional arguments... */
1961 )
1962 {
1963 va_list arp;
1964 UCHAR c, f, r;
1965 ULONG val;
1966 char s[16];
1967 int i, w, res, cc;
1968  
1969  
1970 va_start(arp, str);
1971  
1972 for (cc = res = 0; cc != EOF; res += cc) {
1973 c = *str++;
1974 if (c == 0) break; /* End of string */
1975 if (c != '%') { /* Non escape cahracter */
1976 cc = fputc(c, fil);
1977 if (cc != EOF) cc = 1;
1978 continue;
1979 }
1980 w = f = 0;
1981 c = *str++;
1982 if (c == '0') { /* Flag: '0' padding */
1983 f = 1; c = *str++;
1984 }
1985 while (c >= '0' && c <= '9') { /* Precision */
1986 w = w * 10 + (c - '0');
1987 c = *str++;
1988 }
1989 if (c == 'l') { /* Prefix: Size is long int */
1990 f |= 2; c = *str++;
1991 }
1992 if (c == 's') { /* Type is string */
1993 cc = fputs(va_arg(arp, char*), fil);
1994 continue;
1995 }
1996 if (c == 'c') { /* Type is character */
1997 cc = fputc(va_arg(arp, char), fil);
1998 if (cc != EOF) cc = 1;
1999 continue;
2000 }
2001 r = 0;
2002 if (c == 'd') r = 10; /* Type is signed decimal */
2003 if (c == 'u') r = 10; /* Type is unsigned decimal */
2004 if (c == 'X') r = 16; /* Type is unsigned hexdecimal */
2005 if (r == 0) break; /* Unknown type */
2006 if (f & 2) { /* Get the value */
2007 val = (ULONG)va_arg(arp, long);
2008 } else {
2009 val = (c == 'd') ? (ULONG)(long)va_arg(arp, int) : (ULONG)va_arg(arp, unsigned int);
2010 }
2011 /* Put numeral string */
2012 if (c == 'd') {
2013 if (val >= 0x80000000) {
2014 val = 0 - val;
2015 f |= 4;
2016 }
2017 }
2018 i = sizeof(s) - 1; s[i] = 0;
2019 do {
2020 c = (UCHAR)(val % r + '0');
2021 if (c > '9') c += 7;
2022 s[--i] = c;
2023 val /= r;
2024 } while (i && val);
2025 if (i && (f & 4)) s[--i] = '-';
2026 w = sizeof(s) - 1 - w;
2027 while (i && i > w) s[--i] = (f & 1) ? '0' : ' ';
2028 cc = fputs(&s[i], fil);
2029 }
2030  
2031 va_end(arp);
2032 return (cc == EOF) ? cc : res;
2033 }
2034  
2035 #endif /* !_FS_READONLY */
2036 #endif /* _USE_STRFUNC >= 1*/