Patches for FatFs and Tiny-FatFs R0.06

April 16, 2008 - FatFs and Tiny-FatFs
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The va_arg(arp,char) used in fprintf() will cause an incorrect behavior on
the big-endian processor due to type promotion rules. Thus the corresponding
code should be changed to va_arg(arp,int).



October 11, 2008 - FatFs and Tiny-FatFs
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Warnings due to wrong cast may occure in the get_fileinfo function. To
eliminate it, remove const attribute of the argument, "const BYTE *dir".



October 22, 2008 - FatFs and Tiny-FatFs
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Improving write performance. On sector misaligned long writes, FatFs issues
sector write requests out of the sector order. It will decrease the write
performance of flash memory storages. This is not the case on short writes
without direct transfer. To solve this problem, apply following patches. 

--- ff.c	Tue Apr  1 21:49:26 2008
+++ ff_new.c	Tue Oct 21 23:27:44 2008
@@ -1018,6 +1018,11 @@
 				fp->curr_clust = clust;				/* Update current cluster */
 				fp->csect = 0;						/* Reset sector address in the cluster */
 			}
+			if (fp->flag & FA__DIRTY) {				/* Write back file I/O buffer prior to following direct transfer */
+				if (disk_write(fp->fs->drive, fp->buffer, fp->curr_sect, 1) != RES_OK)
+					goto fw_error;
+				fp->flag &= (BYTE)~FA__DIRTY;
+			}
 			sect = clust2sect(fp->fs, fp->curr_clust) + fp->csect;	/* Get current sector */
 			cc = btw / SS(fp->fs);					/* When remaining bytes >= sector size, */
 			if (cc) {								/* Write maximum contiguous sectors directly */
@@ -1030,11 +1035,6 @@
 				continue;
 			}
 			if (sect != fp->curr_sect) {			/* Is window offset changed? */
-				if (fp->flag & FA__DIRTY) {			/* Write back file I/O buffer if needed */
-					if (disk_write(fp->fs->drive, fp->buffer, fp->curr_sect, 1) != RES_OK)
-						goto fw_error;
-					fp->flag &= (BYTE)~FA__DIRTY;
-				}
 				if (fp->fptr < fp->fsize &&  		/* Fill file I/O buffer with file data */
 					disk_read(fp->fs->drive, fp->buffer, sect, 1) != RES_OK)
 						goto fw_error;


--- tff.c	Tue Apr  1 21:49:28 2008
+++ tff_new.c	Wed Oct 22 02:13:05 2008
@@ -1037,6 +1037,8 @@
 		if (wcnt > btw) wcnt = btw;
 		memcpy(&fp->fs->win[fp->fptr % 512U], wbuff, wcnt);
 		fp->fs->winflag = 1;
+		if (((UINT)fp->fptr + wcnt) % 512U == 0		/* Flush sector window when last byte is written */
+			&& !move_window(0)) goto fw_error;
 	}
 
 	if (fp->fptr > fp->fsize) fp->fsize = fp->fptr;	/* Update file size if needed */