main__.c

this program for sd mmc card in fat file system

	return res;
}

#endif /* !_FS_READONLY */




/*-----------------------------------------------------------------------*/
/* Close File                                                            */
/*-----------------------------------------------------------------------*/

FRESULT f_close (
	FIL *fp		/* Pointer to the file object to be closed */
)
{
	FRESULT res;


#if !_FS_READONLY
	res = f_sync(fp);
#else
	res = validate(fp->fs, fp->id);
#endif
	if (res == FR_OK)
		fp->fs = NULL;

	return res;
}




#if _FS_MINIMIZE <= 2
/*-----------------------------------------------------------------------*/
/* Seek File Pointer                                                     */
/*-----------------------------------------------------------------------*/

FRESULT f_lseek (
	FIL *fp,		/* Pointer to the file object */
	DWORD ofs		/* File pointer from top of file */
)
{
	CLUST clust;
	DWORD csize;
	BYTE csect;
	FRESULT res;
	FATFS *fs = fp->fs;


	res = validate(fs, fp->id);			/* Check validity of the object */
	if (res != FR_OK) return res;

	if (fp->flag & FA__ERROR) return FR_RW_ERROR;
#if !_FS_READONLY
	if (ofs > fp->fsize && !(fp->flag & FA_WRITE))
#else
	if (ofs > fp->fsize)
#endif
		ofs = fp->fsize;
	fp->fptr = 0; fp->sect_clust = 1;		/* Set file R/W pointer to top of the file */

	/* Move file R/W pointer if needed */
	if (ofs) {
		clust = fp->org_clust;	/* Get start cluster */
#if !_FS_READONLY
		if (!clust) {			/* If the file does not have a cluster chain, create new cluster chain */
			clust = create_chain(0);
			if (clust == 1) goto fk_error;
			fp->org_clust = clust;
		}
#endif
		if (clust) {			/* If the file has a cluster chain, it can be followed */
			csize = (DWORD)fs->sects_clust * 512;		/* Cluster size in unit of byte */
			for (;;) {									/* Loop to skip leading clusters */
				fp->curr_clust = clust;					/* Update current cluster */
				if (ofs <= csize) break;
#if !_FS_READONLY
				if (fp->flag & FA_WRITE)				/* Check if in write mode or not */
					clust = create_chain(clust);		/* Force streached if in write mode */
				else
#endif
					clust = get_cluster(clust);			/* Only follow cluster chain if not in write mode */
				if (clust == 0) {						/* Stop if could not follow the cluster chain */
					ofs = csize; break;
				}
				if (clust == 1 || clust >= fs->max_clust) goto fk_error;
				fp->fptr += csize;						/* Update R/W pointer */
				ofs -= csize;
			}
			csect = (BYTE)((ofs - 1) / 512);			/* Sector offset in the cluster */
			fp->curr_sect = clust2sect(clust) + csect;	/* Current sector */
			fp->sect_clust = fs->sects_clust - csect;	/* Left sector counter in the cluster */
			fp->fptr += ofs;							/* Update file R/W pointer */
		}
	}
#if !_FS_READONLY
	if ((fp->flag & FA_WRITE) && fp->fptr > fp->fsize) {	/* Set updated flag if in write mode */
		fp->fsize = fp->fptr;
		fp->flag |= FA__WRITTEN;
	}
#endif

	return FR_OK;

fk_error:	/* Abort this function due to an unrecoverable error */
	fp->flag |= FA__ERROR;
	return FR_RW_ERROR;
}




#if _FS_MINIMIZE <= 1
/*-----------------------------------------------------------------------*/
/* Open a directroy                                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_opendir (
	DIR *dirobj,		/* Pointer to directory object to create */
	const char *path	/* Pointer to the directory path */
)
{
	BYTE *dir;
	char fn[8+3+1];
	FRESULT res;
	FATFS *fs = FatFs;


	res = auto_mount(&path, 0);
	if (res != FR_OK) return res;

	res = trace_path(dirobj, fn, path, &dir);	/* Trace the directory path */
	if (res == FR_OK) {							/* Trace completed */
		if (dir != NULL) {						/* It is not the root dir */
			if (dir[DIR_Attr] & AM_DIR) {		/* The entry is a directory */
	 			dirobj->clust =
#if _FAT32
					((DWORD)LD_WORD(&dir[DIR_FstClusHI]) << 16) |
#endif
					LD_WORD(&dir[DIR_FstClusLO]);
				dirobj->sect = clust2sect(dirobj->clust);
				dirobj->index = 2;
			} else {						/* The entry is not a directory */
				res = FR_NO_FILE;
			}
		}
		dirobj->id = fs->id;
	}
	return res;
}




/*-----------------------------------------------------------------------*/
/* Read Directory Entry in Sequense                                      */
/*-----------------------------------------------------------------------*/

FRESULT f_readdir (
	DIR *dirobj,		/* Pointer to the directory object */
	FILINFO *finfo		/* Pointer to file information to return */
)
{
	BYTE *dir, c;
	FRESULT res;
	FATFS *fs = dirobj->fs;


	res = validate(fs, dirobj->id);			/* Check validity of the object */
	if (res != FR_OK) return res;

	finfo->fname[0] = 0;
	while (dirobj->sect) {
		if (!move_window(dirobj->sect))
			return FR_RW_ERROR;
		dir = &fs->win[(dirobj->index & 15) * 32];		/* pointer to the directory entry */
		c = dir[DIR_Name];
		if (c == 0) break;								/* Has it reached to end of dir? */
		if (c != 0xE5 && !(dir[DIR_Attr] & AM_VOL))		/* Is it a valid entry? */
			get_fileinfo(finfo, dir);
		if (!next_dir_entry(dirobj)) dirobj->sect = 0;	/* Next entry */
		if (finfo->fname[0]) break;						/* Found valid entry */
	}

	return FR_OK;
}




#if _FS_MINIMIZE == 0
/*-----------------------------------------------------------------------*/
/* Get File Status                                                       */
/*-----------------------------------------------------------------------*/

FRESULT f_stat (
	const char *path,	/* Pointer to the file path */
	FILINFO *finfo		/* Pointer to file information to return */
)
{
	BYTE *dir;
	char fn[8+3+1];
	FRESULT res;
	DIR dirobj;


	res = auto_mount(&path, 0);
	if (res != FR_OK) return res;

	res = trace_path(&dirobj, fn, path, &dir);	/* Trace the file path */
	if (res == FR_OK) {							/* Trace completed */
		if (dir)	/* Found an object */
			get_fileinfo(finfo, dir);
		else		/* It is root dir */
			res = FR_INVALID_NAME;
	}

	return res;
}




#if !_FS_READONLY
/*-----------------------------------------------------------------------*/
/* Get Number of Free Clusters                                           */
/*-----------------------------------------------------------------------*/

FRESULT f_getfree (
	const char *drv,	/* Logical drive number */
	DWORD *nclust,		/* Pointer to the double word to return number of free clusters */
	FATFS **fatfs		/* Pointer to pointer to the file system object to return */
)
{
	DWORD n, sect;
	CLUST clust;
	BYTE fat, f, *p;
	FRESULT res;
	FATFS *fs;


	/* Get drive number */
	res = auto_mount(&drv, 0);
	if (res != FR_OK) return res;
	*fatfs = fs = FatFs;

	/* If number of free cluster is valid, return it without cluster scan. */
	if (fs->free_clust <= fs->max_clust - 2) {
		*nclust = fs->free_clust;
		return FR_OK;
	}

	/* Count number of free clusters */
	fat = fs->fs_type;
	n = 0;
	if (fat == FS_FAT12) {
		clust = 2;
		do {
			if ((WORD)get_cluster(clust) == 0) n++;
		} while (++clust < fs->max_clust);
	} else {
		clust = fs->max_clust;
		sect = fs->fatbase;
		f = 0; p = 0;
		do {
			if (!f) {
				if (!move_window(sect++)) return FR_RW_ERROR;
				p = fs->win;
			}
			if (!_FAT32 || fat == FS_FAT16) {
				if (LD_WORD(p) == 0) n++;
				p += 2; f += 1;
			} else {
				if (LD_DWORD(p) == 0) n++;
				p += 4; f += 2;
			}
		} while (--clust);
	}
	fs->free_clust = n;
#if _USE_FSINFO
	if (fat == FS_FAT32) fs->fsi_flag = 1;
#endif

	*nclust = n;
	return FR_OK;
}




/*-----------------------------------------------------------------------*/
/* Delete a File or a Directory                                          */
/*-----------------------------------------------------------------------*/

FRESULT f_unlink (
	const char *path			/* Pointer to the file or directory path */
)
{
	BYTE *dir, *sdir;
	DWORD dsect;
	char fn[8+3+1];
	CLUST dclust;
	FRESULT res;
	DIR dirobj;
	FATFS *fs = FatFs;


	res = auto_mount(&path, 1);
	if (res != FR_OK) return res;

	res = trace_path(&dirobj, fn, path, &dir);	/* Trace the file path */
	if (res != FR_OK) return res;				/* Trace failed */
	if (dir == NULL) return FR_INVALID_NAME;	/* It is the root directory */
	if (dir[DIR_Attr] & AM_RDO) return FR_DENIED;	/* It is a R/O object */
	dsect = fs->winsect;
	dclust =
#if _FAT32
		((DWORD)LD_WORD(&dir[DIR_FstClusHI]) << 16) |
#endif
		LD_WORD(&dir[DIR_FstClusLO]);
	if (dir[DIR_Attr] & AM_DIR) {				/* It is a sub-directory */
		dirobj.clust = dclust;					/* Check if the sub-dir is empty or not */
		dirobj.sect = clust2sect(dclust);
		dirobj.index = 2;
		do {
			if (!move_window(dirobj.sect)) return FR_RW_ERROR;
			sdir = &fs->win[(dirobj.index & 15) * 32];
			if (sdir[DIR_Name] == 0) break;
			if (sdir[DIR_Name] != 0xE5 && !(sdir[DIR_Attr] & AM_VOL))
				return FR_DENIED;	/* The directory is not empty */
		} while (next_dir_entry(&dirobj));
	}

	if (!move_window(dsect)) return FR_RW_ERROR;	/* Mark the directory entry 'deleted' */
	dir[DIR_Name] = 0xE5;
	fs->winflag = 1;
	if (!remove_chain(dclust)) return FR_RW_ERROR;	/* Remove the cluster chain */

	return sync();
}




/*-----------------------------------------------------------------------*/
/* Create a Directory                                                    */
/*-----------------------------------------------------------------------*/

FRESULT f_mkdir (
	const char *path		/* Pointer to the directory path */
)
{
	BYTE *dir, *fw, n;
	char fn[8+3+1];
	DWORD sect, dsect, tim;
	CLUST dclust, pclust;
	FRESULT res;
	DIR dirobj;
	FATFS *fs = FatFs;


	res = auto_mount(&path, 1);
	if (res != FR_OK) return res;

	res = trace_path(&dirobj, fn, path, &dir);	/* Trace the file path */
	if (res == FR_OK) return FR_EXIST;			/* Any file or directory is already existing */
	if (res != FR_NO_FILE) return res;

	res = reserve_direntry(&dirobj, &dir); 		/* Reserve a directory entry */
	if (res != FR_OK) return res;
	sect = fs->winsect;
	dclust = create_chain(0);					/* Allocate a cluster for new directory table */
	if (dclust == 1) return FR_RW_ERROR;
	dsect = clust2sect(dclust);
	if (!dsect) return FR_DENIED;
	if (!move_window(dsect)) return FR_RW_ERROR;

	fw = fs->win;
	memset(fw, 0, 512);							/* Clear the directory table */
	for (n = 1; n < fs->sects_clust; n++) {
		if (disk_write(0, fw, ++dsect, 1) != RES_OK)
			return FR_RW_ERROR;
	}

	memset(&fw[DIR_Name], ' ', 8+3);			/* Create "." entry */
	fw[DIR_Name] = '.';
	fw[DIR_Attr] = AM_DIR;
	tim = get_fattime();
	ST_DWORD(&fw[DIR_WrtTime], tim);
	memcpy(&fw[32], &fw[0], 32); fw[33] = '.';	/* Create ".." entry */
	pclust = dirobj.sclust;
#if _FAT32
	ST_WORD(&fw[   DIR_FstClusHI], dclust >> 16);
	if (fs->fs_type == FS_FAT32 && pclust == fs->dirbase) pclust = 0;
	ST_WORD(&fw[32+DIR_FstClusHI], pclust >> 16);
#endif
	ST_WORD(&fw[   DIR_FstClusLO], dclust);
	ST_WORD(&fw[32+DIR_FstClusLO], pclust);
	fs->winflag = 1;

	if (!move_window(sect)) return FR_RW_ERROR;
	memset(&dir[0], 0, 32);						/* Clean-up the new entry */
	memcpy(&dir[DIR_Name], fn, 8+3);			/* Name */
	dir[DIR_NTres] = fn[11];
	dir[DIR_Attr] = AM_DIR;						/* Attribute */
	ST_DWORD(&dir[DIR_WrtTime], tim);			/* Crated time */
	ST_WORD(&dir[DIR_FstClusLO], dclust);		/* Table start cluster */
#if _FAT32
	ST_WORD(&dir[DIR_FstClusHI], dclust >> 16);
#endif

	return sync();
}




/*-----------------------------------------------------------------------*/
/* Change File Attribute                                                 *