ff.c

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#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */

#include "ff.h"         
#include "diskio.h"     
#if _FATFS != 80960     
#error Wrong include file (ff.h).
#endif

/* Definitions on sector size */
#if _MAX_SS != 512 && _MAX_SS != 1024 && _MAX_SS != 2048 && _MAX_SS != 4096
#error Wrong sector size.
#endif
#if _MAX_SS != 512
#define SS(fs)  ((fs)->ssize)   
#else
#define SS(fs)  512U            
#endif

/* Reentrancy related */
#if _FS_REENTRANT
#if _USE_LFN == 1
#error Static LFN work area cannot be used at thread-safe configuration.
#endif

#define ENTER_FF(fs)        { if (!lock_fs(fs)) return FR_TIMEOUT; }

#define LEAVE_FF(fs, res)   { unlock_fs(fs, res); return res; }
#else

#define ENTER_FF(fs)

#define LEAVE_FF(fs, res)   return res
#endif

#define ABORT(fs, res)      { fp->err = (BYTE)(res); LEAVE_FF(fs, res); }

/* File access control feature */
#if _FS_LOCK
#if _FS_READONLY
#error _FS_LOCK must be 0 at read-only cfg.
#endif

typedef struct {
    FATFS *fs;              
    DWORD clu;              
    WORD idx;               
    WORD ctr;               
} FILESEM;
#endif

/* DBCS code ranges and SBCS extend character conversion table */

#if _CODE_PAGE == 932   
#define _DF1S   0x81    
#define _DF1E   0x9F    
#define _DF2S   0xE0    
#define _DF2E   0xFC    
#define _DS1S   0x40    
#define _DS1E   0x7E    
#define _DS2S   0x80    
#define _DS2E   0xFC    
#elif _CODE_PAGE == 936 
#define _DF1S   0x81
#define _DF1E   0xFE
#define _DS1S   0x40
#define _DS1E   0x7E
#define _DS2S   0x80
#define _DS2E   0xFE

#elif _CODE_PAGE == 949 
#define _DF1S   0x81
#define _DF1E   0xFE
#define _DS1S   0x41
#define _DS1E   0x5A
#define _DS2S   0x61
#define _DS2E   0x7A
#define _DS3S   0x81
#define _DS3E   0xFE

#elif _CODE_PAGE == 950 
#define _DF1S   0x81
#define _DF1E   0xFE
#define _DS1S   0x40
#define _DS1E   0x7E
#define _DS2S   0xA1
#define _DS2E   0xFE

#elif _CODE_PAGE == 437 
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0x41,0x8E,0x41,0x8F,0x80,0x45,0x45,0x45,0x49,0x49,0x49,0x8E,0x8F,0x90,0x92,0x92,0x4F,0x99,0x4F,0x55,0x55,0x59,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0x21,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 720 
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x45,0x41,0x84,0x41,0x86,0x43,0x45,0x45,0x45,0x49,0x49,0x8D,0x8E,0x8F,0x90,0x92,0x92,0x93,0x94,0x95,0x49,0x49,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 737 
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x92,0x92,0x93,0x94,0x95,0x96,0x97,0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87, \
                0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0xAA,0x92,0x93,0x94,0x95,0x96,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                0x97,0xEA,0xEB,0xEC,0xE4,0xED,0xEE,0xE7,0xE8,0xF1,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 775 
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x91,0xA0,0x8E,0x95,0x8F,0x80,0xAD,0xED,0x8A,0x8A,0xA1,0x8D,0x8E,0x8F,0x90,0x92,0x92,0xE2,0x99,0x95,0x96,0x97,0x97,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
                0xA0,0xA1,0xE0,0xA3,0xA3,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xB5,0xB6,0xB7,0xB8,0xBD,0xBE,0xC6,0xC7,0xA5,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE3,0xE8,0xE8,0xEA,0xEA,0xEE,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 850 
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0xB6,0x8E,0xB7,0x8F,0x80,0xD2,0xD3,0xD4,0xD8,0xD7,0xDE,0x8E,0x8F,0x90,0x92,0x92,0xE2,0x99,0xE3,0xEA,0xEB,0x59,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
                0xB5,0xD6,0xE0,0xE9,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0x21,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE7,0xE7,0xE9,0xEA,0xEB,0xED,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 852 
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0xB6,0x8E,0xDE,0x8F,0x80,0x9D,0xD3,0x8A,0x8A,0xD7,0x8D,0x8E,0x8F,0x90,0x91,0x91,0xE2,0x99,0x95,0x95,0x97,0x97,0x99,0x9A,0x9B,0x9B,0x9D,0x9E,0x9F, \
                0xB5,0xD6,0xE0,0xE9,0xA4,0xA4,0xA6,0xA6,0xA8,0xA8,0xAA,0x8D,0xAC,0xB8,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBD,0xBF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC6,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD1,0xD1,0xD2,0xD3,0xD2,0xD5,0xD6,0xD7,0xB7,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                0xE0,0xE1,0xE2,0xE3,0xE3,0xD5,0xE6,0xE6,0xE8,0xE9,0xE8,0xEB,0xED,0xED,0xDD,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xEB,0xFC,0xFC,0xFE,0xFF}

#elif _CODE_PAGE == 855 
#define _DF1S   0
#define _EXCVT {0x81,0x81,0x83,0x83,0x85,0x85,0x87,0x87,0x89,0x89,0x8B,0x8B,0x8D,0x8D,0x8F,0x8F,0x91,0x91,0x93,0x93,0x95,0x95,0x97,0x97,0x99,0x99,0x9B,0x9B,0x9D,0x9D,0x9F,0x9F, \
                0xA1,0xA1,0xA3,0xA3,0xA5,0xA5,0xA7,0xA7,0xA9,0xA9,0xAB,0xAB,0xAD,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB6,0xB6,0xB8,0xB8,0xB9,0xBA,0xBB,0xBC,0xBE,0xBE,0xBF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD1,0xD1,0xD3,0xD3,0xD5,0xD5,0xD7,0xD7,0xDD,0xD9,0xDA,0xDB,0xDC,0xDD,0xE0,0xDF, \
                0xE0,0xE2,0xE2,0xE4,0xE4,0xE6,0xE6,0xE8,0xE8,0xEA,0xEA,0xEC,0xEC,0xEE,0xEE,0xEF,0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF8,0xFA,0xFA,0xFC,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 857 
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0xB6,0x8E,0xB7,0x8F,0x80,0xD2,0xD3,0xD4,0xD8,0xD7,0x98,0x8E,0x8F,0x90,0x92,0x92,0xE2,0x99,0xE3,0xEA,0xEB,0x98,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9E, \
                0xB5,0xD6,0xE0,0xE9,0xA5,0xA5,0xA6,0xA6,0xA8,0xA9,0xAA,0xAB,0xAC,0x21,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xDE,0x59,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 858 
#define _DF1S   0
#define _EXCVT {0x80,0x9A,0x90,0xB6,0x8E,0xB7,0x8F,0x80,0xD2,0xD3,0xD4,0xD8,0xD7,0xDE,0x8E,0x8F,0x90,0x92,0x92,0xE2,0x99,0xE3,0xEA,0xEB,0x59,0x99,0x9A,0x9D,0x9C,0x9D,0x9E,0x9F, \
                0xB5,0xD6,0xE0,0xE9,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0x21,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC7,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD1,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                0xE0,0xE1,0xE2,0xE3,0xE5,0xE5,0xE6,0xE7,0xE7,0xE9,0xEA,0xEB,0xED,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 862 
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                0x41,0x49,0x4F,0x55,0xA5,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0x21,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 866 
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                0x90,0x91,0x92,0x93,0x9d,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F,0xF0,0xF0,0xF2,0xF2,0xF4,0xF4,0xF6,0xF6,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 874 
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 1250 
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x8A,0x9B,0x8C,0x8D,0x8E,0x8F, \
                0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xA3,0xB4,0xB5,0xB6,0xB7,0xB8,0xA5,0xAA,0xBB,0xBC,0xBD,0xBC,0xAF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xF7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xFF}

#elif _CODE_PAGE == 1251 
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x82,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x80,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x8A,0x9B,0x8C,0x8D,0x8E,0x8F, \
                0xA0,0xA2,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB2,0xA5,0xB5,0xB6,0xB7,0xA8,0xB9,0xAA,0xBB,0xA3,0xBD,0xBD,0xAF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF}

#elif _CODE_PAGE == 1252 
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0xAd,0x9B,0x8C,0x9D,0xAE,0x9F, \
                0xA0,0x21,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xF7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0x9F}

#elif _CODE_PAGE == 1253 
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xA2,0xB8,0xB9,0xBA, \
                0xE0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xF2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xFB,0xBC,0xFD,0xBF,0xFF}

#elif _CODE_PAGE == 1254 
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x8A,0x9B,0x8C,0x9D,0x9E,0x9F, \
                0xA0,0x21,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xF7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0x9F}

#elif _CODE_PAGE == 1255 
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                0xA0,0x21,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                0xE0,0xE1,0xE2,0xE3,0xE4,0xE5,0xE6,0xE7,0xE8,0xE9,0xEA,0xEB,0xEC,0xED,0xEE,0xEF,0xF0,0xF1,0xF2,0xF3,0xF4,0xF5,0xF6,0xF7,0xF8,0xF9,0xFA,0xFB,0xFC,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 1256 
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x8C,0x9D,0x9E,0x9F, \
                0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                0x41,0xE1,0x41,0xE3,0xE4,0xE5,0xE6,0x43,0x45,0x45,0x45,0x45,0xEC,0xED,0x49,0x49,0xF0,0xF1,0xF2,0xF3,0x4F,0xF5,0xF6,0xF7,0xF8,0x55,0xFA,0x55,0x55,0xFD,0xFE,0xFF}

#elif _CODE_PAGE == 1257 
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0x9C,0x9D,0x9E,0x9F, \
                0xA0,0xA1,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xA8,0xB9,0xAA,0xBB,0xBC,0xBD,0xBE,0xAF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xF7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xFF}

#elif _CODE_PAGE == 1258 
#define _DF1S   0
#define _EXCVT {0x80,0x81,0x82,0x83,0x84,0x85,0x86,0x87,0x88,0x89,0x8A,0x8B,0x8C,0x8D,0x8E,0x8F,0x90,0x91,0x92,0x93,0x94,0x95,0x96,0x97,0x98,0x99,0x9A,0x9B,0xAC,0x9D,0x9E,0x9F, \
                0xA0,0x21,0xA2,0xA3,0xA4,0xA5,0xA6,0xA7,0xA8,0xA9,0xAA,0xAB,0xAC,0xAD,0xAE,0xAF,0xB0,0xB1,0xB2,0xB3,0xB4,0xB5,0xB6,0xB7,0xB8,0xB9,0xBA,0xBB,0xBC,0xBD,0xBE,0xBF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xCC,0xCD,0xCE,0xCF,0xD0,0xD1,0xD2,0xD3,0xD4,0xD5,0xD6,0xD7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xDE,0xDF, \
                0xC0,0xC1,0xC2,0xC3,0xC4,0xC5,0xC6,0xC7,0xC8,0xC9,0xCA,0xCB,0xEC,0xCD,0xCE,0xCF,0xD0,0xD1,0xF2,0xD3,0xD4,0xD5,0xD6,0xF7,0xD8,0xD9,0xDA,0xDB,0xDC,0xDD,0xFE,0x9F}

#elif _CODE_PAGE == 1   
#if _USE_LFN
#error Cannot use LFN feature without valid code page.
#endif
#define _DF1S   0

#else
#error Unknown code page

#endif

/* Character code support macros */
#define IsUpper(c)  (((c)>='A')&&((c)<='Z'))    
#define IsLower(c)  (((c)>='a')&&((c)<='z'))    
#define IsDigit(c)  (((c)>='0')&&((c)<='9'))    
#if _DF1S       /* Code page is DBCS */

#ifdef _DF2S    /* Two 1st byte areas */

#define IsDBCS1(c)  (((BYTE)(c) >= _DF1S && (BYTE)(c) <= _DF1E) || ((BYTE)(c) >= _DF2S && (BYTE)(c) <= _DF2E))
#else           /* One 1st byte area */

#define IsDBCS1(c)  ((BYTE)(c) >= _DF1S && (BYTE)(c) <= _DF1E)
#endif

#ifdef _DS3S    /* Three 2nd byte areas */

#define IsDBCS2(c)  (((BYTE)(c) >= _DS1S && (BYTE)(c) <= _DS1E) || ((BYTE)(c) >= _DS2S && (BYTE)(c) <= _DS2E) || ((BYTE)(c) >= _DS3S && (BYTE)(c) <= _DS3E))
#else           /* Two 2nd byte areas */

#define IsDBCS2(c)  (((BYTE)(c) >= _DS1S && (BYTE)(c) <= _DS1E) || ((BYTE)(c) >= _DS2S && (BYTE)(c) <= _DS2E))
#endif

#else           /* Code page is SBCS */

#define IsDBCS1(c)  0       
#define IsDBCS2(c)  0       
#endif /* _DF1S */

/* Name status flags */
#define NS          11      
#define NS_LOSS     0x01    
#define NS_LFN      0x02    
#define NS_LAST     0x04    
#define NS_BODY     0x08    
#define NS_EXT      0x10    
#define NS_DOT      0x20    
/* FAT sub-type boundaries */
#define MIN_FAT16   4086U   
#define MIN_FAT32   65526U  
/* FatFs refers the members in the FAT structures as byte array instead of
 * structure member because the structure is not binary compatible between
 * different platforms                                                      */

#define BS_jmpBoot          0       
#define BS_OEMName          3       
#define BPB_BytsPerSec      11      
#define BPB_SecPerClus      13      
#define BPB_RsvdSecCnt      14      
#define BPB_NumFATs         16      
#define BPB_RootEntCnt      17      
#define BPB_TotSec16        19      
#define BPB_Media           21      
#define BPB_FATSz16         22      
#define BPB_SecPerTrk       24      
#define BPB_NumHeads        26      
#define BPB_HiddSec         28      
#define BPB_TotSec32        32      
#define BS_DrvNum           36      
#define BS_BootSig          38      
#define BS_VolID            39      
#define BS_VolLab           43      
#define BS_FilSysType       54      
#define BPB_FATSz32         36      
#define BPB_ExtFlags        40      
#define BPB_FSVer           42      
#define BPB_RootClus        44      
#define BPB_FSInfo          48      
#define BPB_BkBootSec       50      
#define BS_DrvNum32         64      
#define BS_BootSig32        66      
#define BS_VolID32          67      
#define BS_VolLab32         71      
#define BS_FilSysType32     82      
#define FSI_LeadSig         0       
#define FSI_StrucSig        484     
#define FSI_Free_Count      488     
#define FSI_Nxt_Free        492     
#define MBR_Table           446     
#define SZ_PTE              16      
#define BS_55AA             510     
#define DIR_Name            0       
#define DIR_Attr            11      
#define DIR_NTres           12      
#define DIR_CrtTimeTenth    13      
#define DIR_CrtTime         14      
#define DIR_CrtDate         16      
#define DIR_LstAccDate      18      
#define DIR_FstClusHI       20      
#define DIR_WrtTime         22      
#define DIR_WrtDate         24      
#define DIR_FstClusLO       26      
#define DIR_FileSize        28      
#define LDIR_Ord            0       
#define LDIR_Attr           11      
#define LDIR_Type           12      
#define LDIR_Chksum         13      
#define LDIR_FstClusLO      26      
#define SZ_DIR              32      
#define LLE                 0x40    
#define DDE                 0xE5    
#define NDDE                0x05    
#if _VOLUMES
static FATFS *FatFs[_VOLUMES];  
#else
#error Number of volumes must not be 0.
#endif

static WORD Fsid;           
#if _FS_RPATH && _VOLUMES >= 2
static
BYTE CurrVol;               
#endif

#if _FS_LOCK
static FILESEM Files[_FS_LOCK]; 
#endif

#if _USE_LFN == 0           
#define DEF_NAMEBUF         BYTE sfn[12]
#define INIT_BUF(dobj)      (dobj).fn = sfn
#define FREE_BUF()

#elif _USE_LFN == 1         
static
WCHAR LfnBuf[_MAX_LFN+1];
#define DEF_NAMEBUF         BYTE sfn[12]
#define INIT_BUF(dobj)      { (dobj).fn = sfn; (dobj).lfn = LfnBuf; }
#define FREE_BUF()

#elif _USE_LFN == 2         
#define DEF_NAMEBUF         BYTE sfn[12]; WCHAR lbuf[_MAX_LFN+1]
#define INIT_BUF(dobj)      { (dobj).fn = sfn; (dobj).lfn = lbuf; }
#define FREE_BUF()

#elif _USE_LFN == 3         
#define DEF_NAMEBUF         BYTE sfn[12]; WCHAR *lfn
#define INIT_BUF(dobj)      {                                               \
                            lfn = ff_memalloc((_MAX_LFN + 1) * 2);          \
                            if (!lfn)                                       \
                                LEAVE_FF((dobj).fs, FR_NOT_ENOUGH_CORE);    \
                                (dobj).lfn = lfn;                           \
                                (dobj).fn = sfn;                            \
                            }
#define FREE_BUF()          ff_memfree(lfn)

#else
#error Wrong LFN configuration.
#endif

#ifdef _EXCVT
static const BYTE ExCvt[] = _EXCVT; 
#endif

static void mem_cpy(void* dst, const void* src, UINT cnt) {
    BYTE *d = (BYTE*) dst;
    const BYTE *s = (const BYTE*) src;

#if _WORD_ACCESS == 1
    while (cnt >= sizeof (int)) {
        *(int*)d = *(int*)s;
        d += sizeof (int); s += sizeof (int);
        cnt -= sizeof (int);
    }
#endif
    while (cnt--)
        *d++ = *s++;
}

static void mem_set(void* dst, int val, UINT cnt) {
    BYTE *d = (BYTE*) dst;

    while (cnt--)
        *d++ = (BYTE) val;
}

static int mem_cmp(const void* dst, const void* src, UINT cnt) {
    const BYTE *d = (const BYTE *) dst, *s = (const BYTE *) src;
    int r = 0;

    while (cnt-- && (r = *d++ - *s++) == 0)
        ;
    return r;
}

static int chk_chr(const char* str, int chr) {
    while (*str && *str != chr)
        str++;
    return *str;
}

#if _FS_REENTRANT

static int lock_fs(FATFS* fs) {
    return ff_req_grant(fs->sobj);
}
#endif /* _FS_REENTRANT */

#if _FS_REENTRANT

static void unlock_fs(FATFS* fs, FRESULT res) {
    if (fs && res != FR_NOT_ENABLED && res != FR_INVALID_DRIVE
            && res != FR_INVALID_OBJECT && res != FR_TIMEOUT) {
        ff_rel_grant(fs->sobj);
    }
}
#endif /* _FS_REENTRANT */

#if _FS_LOCK

static FRESULT chk_lock(DIR* dp, int acc) {
    UINT i, be;

    /* Search file semaphore table */
    for (i = be = 0; i < _FS_LOCK; i++) {
        if (Files[i].fs) {  /* Existing entry */
            if (Files[i].fs == dp->fs &&        /* Check if the object matched with an open object */
                Files[i].clu == dp->sclust &&
                Files[i].idx == dp->index) break;
        } else {            /* Blank entry */
            be = 1;
        }
    }
    if (i == _FS_LOCK)  /* The object is not opened */
        return (be || acc == 2) ? FR_OK : FR_TOO_MANY_OPEN_FILES;   /* Is there a blank entry for new object? */

    /* The object has been opened. Reject any open against writing file and all write mode open */
    return (acc || Files[i].ctr == 0x100) ? FR_LOCKED : FR_OK;
}
#endif /* _FS_LOCK */

#if _FS_LOCK

static int enq_lock(void) {
    UINT i;

    for (i = 0; i < _FS_LOCK && Files[i].fs; i++) ;
    return (i == _FS_LOCK) ? 0 : 1;
}
#endif /* _FS_LOCK */

#if _FS_LOCK

static UINT inc_lock(DIR* dp, int acc) {
    UINT i;


    for (i = 0; i < _FS_LOCK; i++) {    /* Find the object */
        if (Files[i].fs == dp->fs &&
            Files[i].clu == dp->sclust &&
            Files[i].idx == dp->index) break;
    }

    if (i == _FS_LOCK) {                /* Not opened. Register it as new. */
        for (i = 0; i < _FS_LOCK && Files[i].fs; i++) ;
        if (i == _FS_LOCK) return 0;    /* No free entry to register (int err) */
        Files[i].fs = dp->fs;
        Files[i].clu = dp->sclust;
        Files[i].idx = dp->index;
        Files[i].ctr = 0;
    }

    if (acc && Files[i].ctr) return 0;  /* Access violation (int err) */

    Files[i].ctr = acc ? 0x100 : Files[i].ctr + 1;  /* Set semaphore value */

    return i + 1;
}
#endif /* _FS_LOCK */

#if _FS_LOCK

static FRESULT dec_lock(UINT i) {
    WORD n;
    FRESULT res;

    if (--i < _FS_LOCK) {   /* Shift index number origin from 0 */
        n = Files[i].ctr;
        if (n == 0x100) n = 0;      /* If write mode open, delete the entry */
        if (n) n--;                 /* Decrement read mode open count */
        Files[i].ctr = n;
        if (!n) Files[i].fs = 0;    /* Delete the entry if open count gets zero */
        res = FR_OK;
    } else {
        res = FR_INT_ERR;           /* Invalid index nunber */
    }
    return res;
}
#endif /* _FS_LOCK */

#if _FS_LOCK

static void clear_lock(FATFS *fs) {
    UINT i;

    for (i = 0; i < _FS_LOCK; i++) {
        if (Files[i].fs == fs) Files[i].fs = 0;
    }
}
#endif /* _FS_LOCK */

#if !_FS_READONLY

static FRESULT sync_window(FATFS* fs) {
    DWORD wsect;
    UINT nf;


    if (fs->wflag) {    /* Write back the sector if it is dirty */
        wsect = fs->winsect;    /* Current sector number */
        if (disk_write(fs->drv, fs->win, wsect, 1))
            return FR_DISK_ERR;
        fs->wflag = 0;
        if (wsect - fs->fatbase < fs->fsize) {      /* Is it in the FAT area? */
            for (nf = fs->n_fats; nf >= 2; nf--) {  /* Reflect the change to all FAT copies */
                wsect += fs->fsize;
                disk_write(fs->drv, fs->win, wsect, 1);
            }
        }
    }
    return FR_OK;
}
#endif /* !_FS_READONLY */

static FRESULT move_window(FATFS* fs, DWORD sector) {
    if (sector != fs->winsect) { /* Changed current window */
#if !_FS_READONLY
        if (sync_window(fs) != FR_OK)
            return FR_DISK_ERR;
#endif
        if (disk_read(fs->drv, fs->win, sector, 1))
            return FR_DISK_ERR;
        fs->winsect = sector;
    }

    return FR_OK;
}

#if !_FS_READONLY

static FRESULT sync_fs(FATFS* fs) {
    FRESULT res;

    res = sync_window(fs);
    if (res == FR_OK) {
        /* Update FSINFO sector if needed */
        if (fs->fs_type == FS_FAT32 && fs->fsi_flag == 1) {
            /* Create FSINFO structure */
            mem_set(fs->win, 0, SS(fs));
            ST_WORD(fs->win+BS_55AA, 0xAA55);
            ST_DWORD(fs->win+FSI_LeadSig, 0x41615252);
            ST_DWORD(fs->win+FSI_StrucSig, 0x61417272);
            ST_DWORD(fs->win+FSI_Free_Count, fs->free_clust);
            ST_DWORD(fs->win+FSI_Nxt_Free, fs->last_clust);
            /* Write it into the FSINFO sector */
            fs->winsect = fs->volbase + 1;
            disk_write(fs->drv, fs->win, fs->winsect, 1);
            fs->fsi_flag = 0;
        }
        /* Make sure that no pending write process in the physical drive */
        if (disk_ioctl(fs->drv, CTRL_SYNC, 0) != RES_OK)
            res = FR_DISK_ERR;
    }

    return res;
}
#endif /* !_FS_READONLY */

DWORD clust2sect(FATFS* fs, DWORD clst) {
    clst -= 2;
    if (clst >= (fs->n_fatent - 2)) return 0;       /* Invalid cluster# */
    return clst * fs->csize + fs->database;
}

DWORD get_fat(FATFS* fs, DWORD clst) {
    UINT wc, bc;
    BYTE *p;


    if (clst < 2 || clst >= fs->n_fatent)   /* Check range */
        return 1;

    switch (fs->fs_type) {
    case FS_FAT12 :
        bc = (UINT)clst; bc += bc / 2;
        if (move_window(fs, fs->fatbase + (bc / SS(fs)))) break;
        wc = fs->win[bc % SS(fs)]; bc++;
        if (move_window(fs, fs->fatbase + (bc / SS(fs)))) break;
        wc |= fs->win[bc % SS(fs)] << 8;
        return clst & 1 ? wc >> 4 : (wc & 0xFFF);

    case FS_FAT16 :
        if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 2)))) break;
        p = &fs->win[clst * 2 % SS(fs)];
        return LD_WORD(p);

    case FS_FAT32 :
        if (move_window(fs, fs->fatbase + (clst / (SS(fs) / 4)))) break;
        p = &fs->win[clst * 4 % SS(fs)];
        return LD_DWORD(p) & 0x0FFFFFFF;
    }

    return 0xFFFFFFFF;  /* An error occurred at the disk I/O layer */
}

#if !_FS_READONLY

FRESULT put_fat(FATFS* fs, DWORD clst, DWORD val) {
    UINT bc;
    BYTE *p;
    FRESULT res;


    if (clst < 2 || clst >= fs->n_fatent) { /* Check range */
        res = FR_INT_ERR;

    } else {
        switch (fs->fs_type) {
        case FS_FAT12 :
            bc = (UINT)clst; bc += bc / 2;
            res = move_window(fs, fs->fatbase + (bc / SS(fs)));
            if (res != FR_OK) break;
            p = &fs->win[bc % SS(fs)];
            *p = (clst & 1) ? ((*p & 0x0F) | ((BYTE)val << 4)) : (BYTE)val;
            bc++;
            fs->wflag = 1;
            res = move_window(fs, fs->fatbase + (bc / SS(fs)));
            if (res != FR_OK) break;
            p = &fs->win[bc % SS(fs)];
            *p = (clst & 1) ? (BYTE)(val >> 4) : ((*p & 0xF0) | ((BYTE)(val >> 8) & 0x0F));
            break;

        case FS_FAT16 :
            res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 2)));
            if (res != FR_OK) break;
            p = &fs->win[clst * 2 % SS(fs)];
            ST_WORD(p, (WORD)val);
            break;

        case FS_FAT32 :
            res = move_window(fs, fs->fatbase + (clst / (SS(fs) / 4)));
            if (res != FR_OK) break;
            p = &fs->win[clst * 4 % SS(fs)];
            val |= LD_DWORD(p) & 0xF0000000;
            ST_DWORD(p, val);
            break;

        default :
            res = FR_INT_ERR;
        }
        fs->wflag = 1;
    }

    return res;
}
#endif /* !_FS_READONLY */

#if !_FS_READONLY

static FRESULT remove_chain(FATFS* fs, DWORD clst) {
    FRESULT res;
    DWORD nxt;
#if _USE_ERASE
    DWORD scl = clst, ecl = clst, rt[2];
#endif

    if (clst < 2 || clst >= fs->n_fatent) { /* Check range */
        res = FR_INT_ERR;

    } else {
        res = FR_OK;
        while (clst < fs->n_fatent) {           /* Not a last link? */
            nxt = get_fat(fs, clst);            /* Get cluster status */
            if (nxt == 0) break;                /* Empty cluster? */
            if (nxt == 1) { res = FR_INT_ERR; break; }  /* Internal error? */
            if (nxt == 0xFFFFFFFF) { res = FR_DISK_ERR; break; }    /* Disk error? */
            res = put_fat(fs, clst, 0);         /* Mark the cluster "empty" */
            if (res != FR_OK) break;
            if (fs->free_clust != 0xFFFFFFFF) { /* Update FSINFO */
                fs->free_clust++;
                fs->fsi_flag |= 1;
            }
#if _USE_ERASE
            if (ecl + 1 == nxt) {   /* Is next cluster contiguous? */
                ecl = nxt;
            } else {                /* End of contiguous clusters */ 
                rt[0] = clust2sect(fs, scl);                    /* Start sector */
                rt[1] = clust2sect(fs, ecl) + fs->csize - 1;    /* End sector */
                disk_ioctl(fs->drv, CTRL_ERASE_SECTOR, rt);     /* Erase the block */
                scl = ecl = nxt;
            }
#endif
            clst = nxt; /* Next cluster */
        }
    }

    return res;
}
#endif /* !_FS_READONLY */

#if !_FS_READONLY

static DWORD create_chain(FATFS* fs, DWORD clst) {
    DWORD cs, ncl, scl;
    FRESULT res;


    if (clst == 0) {        /* Create a new chain */
        scl = fs->last_clust;           /* Get suggested start point */
        if (!scl || scl >= fs->n_fatent) scl = 1;
    }
    else {                  /* Stretch the current chain */
        cs = get_fat(fs, clst);         /* Check the cluster status */
        if (cs < 2) return 1;           /* It is an invalid cluster */
        if (cs < fs->n_fatent) return cs;   /* It is already followed by next cluster */
        scl = clst;
    }

    ncl = scl;              /* Start cluster */
    for (;;) {
        ncl++;                          /* Next cluster */
        if (ncl >= fs->n_fatent) {      /* Wrap around */
            ncl = 2;
            if (ncl > scl) return 0;    /* No free cluster */
        }
        cs = get_fat(fs, ncl);          /* Get the cluster status */
        if (cs == 0) break;             /* Found a free cluster */
        if (cs == 0xFFFFFFFF || cs == 1)/* An error occurred */
            return cs;
        if (ncl == scl) return 0;       /* No free cluster */
    }

    res = put_fat(fs, ncl, 0x0FFFFFFF); /* Mark the new cluster "last link" */
    if (res == FR_OK && clst != 0) {
        res = put_fat(fs, clst, ncl);   /* Link it to the previous one if needed */
    }
    if (res == FR_OK) {
        fs->last_clust = ncl;           /* Update FSINFO */
        if (fs->free_clust != 0xFFFFFFFF) {
            fs->free_clust--;
            fs->fsi_flag |= 1;
        }
    } else {
        ncl = (res == FR_DISK_ERR) ? 0xFFFFFFFF : 1;
    }

    return ncl;     /* Return new cluster number or error code */
}
#endif /* !_FS_READONLY */

#if _USE_FASTSEEK

static DWORD clmt_clust (
        FIL* fp,
        DWORD ofs
)
{
    DWORD cl, ncl, *tbl;


    tbl = fp->cltbl + 1;    /* Top of CLMT */
    cl = ofs / SS(fp->fs) / fp->fs->csize;  /* Cluster order from top of the file */
    for (;;) {
        ncl = *tbl++;           /* Number of cluters in the fragment */
        if (!ncl) return 0;     /* End of table? (error) */
        if (cl < ncl) break;    /* In this fragment? */
        cl -= ncl; tbl++;       /* Next fragment */
    }
    return cl + *tbl;   /* Return the cluster number */
}
#endif  /* _USE_FASTSEEK */

static FRESULT dir_sdi(DIR* dp, WORD idx) {
    DWORD clst;
    WORD ic;


    dp->index = idx;
    clst = dp->sclust;
    if (clst == 1 || clst >= dp->fs->n_fatent)  /* Check start cluster range */
        return FR_INT_ERR;
    if (!clst && dp->fs->fs_type == FS_FAT32)   /* Replace cluster# 0 with root cluster# if in FAT32 */
        clst = dp->fs->dirbase;

    if (clst == 0) {    /* Static table (root-directory in FAT12/16) */
        dp->clust = clst;
        if (idx >= dp->fs->n_rootdir)       /* Index is out of range */
            return FR_INT_ERR;
        dp->sect = dp->fs->dirbase + idx / (SS(dp->fs) / SZ_DIR);   /* Sector# */
    }
    else {              /* Dynamic table (sub-dirs or root-directory in FAT32) */
        ic = SS(dp->fs) / SZ_DIR * dp->fs->csize;   /* Entries per cluster */
        while (idx >= ic) { /* Follow cluster chain */
            clst = get_fat(dp->fs, clst);               /* Get next cluster */
            if (clst == 0xFFFFFFFF) return FR_DISK_ERR; /* Disk error */
            if (clst < 2 || clst >= dp->fs->n_fatent)   /* Reached to end of table or int error */
                return FR_INT_ERR;
            idx -= ic;
        }
        dp->clust = clst;
        dp->sect = clust2sect(dp->fs, clst) + idx / (SS(dp->fs) / SZ_DIR);  /* Sector# */
    }

    dp->dir = dp->fs->win + (idx % (SS(dp->fs) / SZ_DIR)) * SZ_DIR; /* Ptr to the entry in the sector */

    return FR_OK;   /* Seek succeeded */
}

static FRESULT dir_next(DIR* dp, int stretch) {
    DWORD clst;
    WORD i;


    i = dp->index + 1;
    if (!i || !dp->sect)    /* Report EOT when index has reached 65535 */
        return FR_NO_FILE;

    if (!(i % (SS(dp->fs) / SZ_DIR))) { /* Sector changed? */
        dp->sect++;                 /* Next sector */

        if (!dp->clust) {       /* Static table */
            if (i >= dp->fs->n_rootdir) /* Report EOT if it reached end of static table */
                return FR_NO_FILE;
        }
        else {                  /* Dynamic table */
            if (((i / (SS(dp->fs) / SZ_DIR)) & (dp->fs->csize - 1)) == 0) { /* Cluster changed? */
                clst = get_fat(dp->fs, dp->clust);              /* Get next cluster */
                if (clst <= 1) return FR_INT_ERR;
                if (clst == 0xFFFFFFFF) return FR_DISK_ERR;
                if (clst >= dp->fs->n_fatent) {                 /* If it reached end of dynamic table, */
#if !_FS_READONLY
                    BYTE c;
                    if (!stretch) return FR_NO_FILE;            /* If do not stretch, report EOT */
                    clst = create_chain(dp->fs, dp->clust);     /* Stretch cluster chain */
                    if (clst == 0) return FR_DENIED;            /* No free cluster */
                    if (clst == 1) return FR_INT_ERR;
                    if (clst == 0xFFFFFFFF) return FR_DISK_ERR;
                    /* Clean-up stretched table */
                    if (sync_window(dp->fs)) return FR_DISK_ERR;/* Flush disk access window */
                    mem_set(dp->fs->win, 0, SS(dp->fs));        /* Clear window buffer */
                    dp->fs->winsect = clust2sect(dp->fs, clst); /* Cluster start sector */
                    for (c = 0; c < dp->fs->csize; c++) {       /* Fill the new cluster with 0 */
                        dp->fs->wflag = 1;
                        if (sync_window(dp->fs)) return FR_DISK_ERR;
                        dp->fs->winsect++;
                    }
                    dp->fs->winsect -= c;                       /* Rewind window offset */
#else
                    if (!stretch) return FR_NO_FILE;            /* If do not stretch, report EOT */
                    return FR_NO_FILE;                          /* Report EOT */
#endif
                }
                dp->clust = clst;               /* Initialize data for new cluster */
                dp->sect = clust2sect(dp->fs, clst);
            }
        }
    }

    dp->index = i;  /* Current index */
    dp->dir = dp->fs->win + (i % (SS(dp->fs) / SZ_DIR)) * SZ_DIR;   /* Current entry in the window */

    return FR_OK;
}

#if !_FS_READONLY

static FRESULT dir_alloc(DIR* dp, UINT nent) {
    FRESULT res;
    UINT n;


    res = dir_sdi(dp, 0);
    if (res == FR_OK) {
        n = 0;
        do {
            res = move_window(dp->fs, dp->sect);
            if (res != FR_OK) break;
            if (dp->dir[0] == DDE || dp->dir[0] == 0) { /* Is it a blank entry? */
                if (++n == nent) break; /* A block of contiguous entries is found */
            } else {
                n = 0;                  /* Not a blank entry. Restart to search */
            }
            res = dir_next(dp, 1);      /* Next entry with table stretch enabled */
        } while (res == FR_OK);
    }
    if (res == FR_NO_FILE) res = FR_DENIED; /* No directory entry to allocate */
    return res;
}
#endif /* !_FS_READONLY */

static DWORD ld_clust(FATFS* fs, BYTE* dir) {
    DWORD cl;

    cl = LD_WORD(dir+DIR_FstClusLO);
    if (fs->fs_type == FS_FAT32)
        cl |= (DWORD)LD_WORD(dir+DIR_FstClusHI) << 16;

    return cl;
}


#if !_FS_READONLY

static void st_clust(BYTE* dir, DWORD cl) {
    ST_WORD(dir+DIR_FstClusLO, cl);
    ST_WORD(dir+DIR_FstClusHI, cl >> 16);
}
#endif /* !_FS_READONLY */

#if _USE_LFN

static const BYTE LfnOfs[] = {1,3,5,7,9,14,16,18,20,22,24,28,30};
#endif /* _USE_LFN */

#if _USE_LFN

static int cmp_lfn (
        WCHAR* lfnbuf,
        BYTE* dir
)
{
    UINT i, s;
    WCHAR wc, uc;


    i = ((dir[LDIR_Ord] & ~LLE) - 1) * 13;  /* Get offset in the LFN buffer */
    s = 0; wc = 1;
    do {
        uc = LD_WORD(dir+LfnOfs[s]);    /* Pick an LFN character from the entry */
        if (wc) {   /* Last character has not been processed */
            wc = ff_wtoupper(uc);       /* Convert it to upper case */
            if (i >= _MAX_LFN || wc != ff_wtoupper(lfnbuf[i++]))    /* Compare it */
                return 0;               /* Not matched */
        } else {
            if (uc != 0xFFFF) return 0; /* Check filler */
        }
    } while (++s < 13);             /* Repeat until all characters in the entry are checked */

    if ((dir[LDIR_Ord] & LLE) && wc && lfnbuf[i])   /* Last segment matched but different length */
        return 0;

    return 1;                       /* The part of LFN matched */
}
#endif /* _USE_LFN */

#if _USE_LFN

static int pick_lfn (
        WCHAR* lfnbuf,
        BYTE* dir
)
{
    UINT i, s;
    WCHAR wc, uc;


    i = ((dir[LDIR_Ord] & 0x3F) - 1) * 13;  /* Offset in the LFN buffer */

    s = 0; wc = 1;
    do {
        uc = LD_WORD(dir+LfnOfs[s]);        /* Pick an LFN character from the entry */
        if (wc) {   /* Last character has not been processed */
            if (i >= _MAX_LFN) return 0;    /* Buffer overflow? */
            lfnbuf[i++] = wc = uc;          /* Store it */
        } else {
            if (uc != 0xFFFF) return 0;     /* Check filler */
        }
    } while (++s < 13);                     /* Read all character in the entry */

    if (dir[LDIR_Ord] & LLE) {              /* Put terminator if it is the last LFN part */
        if (i >= _MAX_LFN) return 0;        /* Buffer overflow? */
        lfnbuf[i] = 0;
    }

    return 1;
}
#endif /* _USE_LFN */

#if _USE_LFN && !_FS_READONLY

static void fit_lfn (
        const WCHAR* lfnbuf,
        BYTE* dir,
        BYTE ord,
        BYTE sum
)
{
    UINT i, s;
    WCHAR wc;


    dir[LDIR_Chksum] = sum;         /* Set check sum */
    dir[LDIR_Attr] = AM_LFN;        /* Set attribute. LFN entry */
    dir[LDIR_Type] = 0;
    ST_WORD(dir+LDIR_FstClusLO, 0);

    i = (ord - 1) * 13;             /* Get offset in the LFN buffer */
    s = wc = 0;
    do {
        if (wc != 0xFFFF) wc = lfnbuf[i++]; /* Get an effective character */
        ST_WORD(dir+LfnOfs[s], wc); /* Put it */
        if (!wc) wc = 0xFFFF;       /* Padding characters following last character */
    } while (++s < 13);
    if (wc == 0xFFFF || !lfnbuf[i]) ord |= LLE; /* Bottom LFN part is the start of LFN sequence */
    dir[LDIR_Ord] = ord;            /* Set the LFN order */
}
#endif /* _USE_LFN && !_FS_READONLY */

#if _USE_LFN

void gen_numname (
        BYTE* dst,
        const BYTE* src,
        const WCHAR* lfn,
        WORD seq
)
{
    BYTE ns[8], c;
    UINT i, j;


    mem_cpy(dst, src, 11);

    if (seq > 5) {  /* On many collisions, generate a hash number instead of sequential number */
        do seq = (seq >> 1) + (seq << 15) + (WORD)*lfn++; while (*lfn);
    }

    /* itoa (hexdecimal) */
    i = 7;
    do {
        c = (seq % 16) + '0';
        if (c > '9') c += 7;
        ns[i--] = c;
        seq /= 16;
    } while (seq);
    ns[i] = '~';

    /* Append the number */
    for (j = 0; j < i && dst[j] != ' '; j++) {
        if (IsDBCS1(dst[j])) {
            if (j == i - 1) break;
            j++;
        }
    }
    do {
        dst[j++] = (i < 8) ? ns[i++] : ' ';
    } while (j < 8);
}
#endif /* _USE_LFN */

#if _USE_LFN

static BYTE sum_sfn (
        const BYTE* dir
)
{
    BYTE sum = 0;
    UINT n = 11;

    do sum = (sum >> 1) + (sum << 7) + *dir++; while (--n);
    return sum;
}
#endif /* _USE_LFN */

static FRESULT dir_find(DIR* dp) {
    FRESULT res;
    BYTE c, *dir;
#if _USE_LFN
    BYTE a, ord, sum;
#endif

    res = dir_sdi(dp, 0);           /* Rewind directory object */
    if (res != FR_OK) return res;

#if _USE_LFN
    ord = sum = 0xFF;
#endif
    do {
        res = move_window(dp->fs, dp->sect);
        if (res != FR_OK) break;
        dir = dp->dir;                  /* Ptr to the directory entry of current index */
        c = dir[DIR_Name];
        if (c == 0) { res = FR_NO_FILE; break; }    /* Reached to end of table */
#if _USE_LFN    /* LFN configuration */
        a = dir[DIR_Attr] & AM_MASK;
        if (c == DDE || ((a & AM_VOL) && a != AM_LFN)) {    /* An entry without valid data */
            ord = 0xFF;
        } else {
            if (a == AM_LFN) {          /* An LFN entry is found */
                if (dp->lfn) {
                    if (c & LLE) {      /* Is it start of LFN sequence? */
                        sum = dir[LDIR_Chksum];
                        c &= ~LLE; ord = c; /* LFN start order */
                        dp->lfn_idx = dp->index;
                    }
                    /* Check validity of the LFN entry and compare it with given name */
                    ord = (c == ord && sum == dir[LDIR_Chksum] && cmp_lfn(dp->lfn, dir)) ? ord - 1 : 0xFF;
                }
            } else {                    /* An SFN entry is found */
                if (!ord && sum == sum_sfn(dir)) break; /* LFN matched? */
                ord = 0xFF; dp->lfn_idx = 0xFFFF;   /* Reset LFN sequence */
                if (!(dp->fn[NS] & NS_LOSS) && !mem_cmp(dir, dp->fn, 11)) break;    /* SFN matched? */
            }
        }
#else       /* Non LFN configuration */
        if (!(dir[DIR_Attr] & AM_VOL) && !mem_cmp(dir, dp->fn, 11)) /* Is it a valid entry? */
            break;
#endif
        res = dir_next(dp, 0);      /* Next entry */
    } while (res == FR_OK);

    return res;
}

#if _FS_MINIMIZE <= 1 || _USE_LABEL || _FS_RPATH >= 2

static FRESULT dir_read(DIR* dp, int vol) {
    FRESULT res;
    BYTE a, c, *dir;
#if _USE_LFN
    BYTE ord = 0xFF, sum = 0xFF;
#endif

    res = FR_NO_FILE;
    while (dp->sect) {
        res = move_window(dp->fs, dp->sect);
        if (res != FR_OK) break;
        dir = dp->dir;                  /* Ptr to the directory entry of current index */
        c = dir[DIR_Name];
        if (c == 0) { res = FR_NO_FILE; break; }    /* Reached to end of table */
        a = dir[DIR_Attr] & AM_MASK;
#if _USE_LFN    /* LFN configuration */
        if (c == DDE || (!_FS_RPATH && c == '.') || (int)(a == AM_VOL) != vol) {    /* An entry without valid data */
            ord = 0xFF;
        } else {
            if (a == AM_LFN) {          /* An LFN entry is found */
                if (c & LLE) {          /* Is it start of LFN sequence? */
                    sum = dir[LDIR_Chksum];
                    c &= ~LLE; ord = c;
                    dp->lfn_idx = dp->index;
                }
                /* Check LFN validity and capture it */
                ord = (c == ord && sum == dir[LDIR_Chksum] && pick_lfn(dp->lfn, dir)) ? ord - 1 : 0xFF;
            } else {                    /* An SFN entry is found */
                if (ord || sum != sum_sfn(dir)) /* Is there a valid LFN? */
                    dp->lfn_idx = 0xFFFF;       /* It has no LFN. */
                break;
            }
        }
#else       /* Non LFN configuration */
        if (c != DDE && (_FS_RPATH || c != '.') && a != AM_LFN && (int)(a == AM_VOL) == vol)    /* Is it a valid entry? */
            break;
#endif
        res = dir_next(dp, 0);              /* Next entry */
        if (res != FR_OK) break;
    }

    if (res != FR_OK) dp->sect = 0;

    return res;
}
#endif  /* _FS_MINIMIZE <= 1 || _USE_LABEL || _FS_RPATH >= 2 */

#if !_FS_READONLY

static FRESULT dir_register(DIR* dp) {
    FRESULT res;
#if _USE_LFN    /* LFN configuration */
    WORD n, ne;
    BYTE sn[12], *fn, sum;
    WCHAR *lfn;


    fn = dp->fn; lfn = dp->lfn;
    mem_cpy(sn, fn, 12);

    if (_FS_RPATH && (sn[NS] & NS_DOT))     /* Cannot create dot entry */
        return FR_INVALID_NAME;

    if (sn[NS] & NS_LOSS) {         /* When LFN is out of 8.3 format, generate a numbered name */
        fn[NS] = 0; dp->lfn = 0;            /* Find only SFN */
        for (n = 1; n < 100; n++) {
            gen_numname(fn, sn, lfn, n);    /* Generate a numbered name */
            res = dir_find(dp);             /* Check if the name collides with existing SFN */
            if (res != FR_OK) break;
        }
        if (n == 100) return FR_DENIED;     /* Abort if too many collisions */
        if (res != FR_NO_FILE) return res;  /* Abort if the result is other than 'not collided' */
        fn[NS] = sn[NS]; dp->lfn = lfn;
    }

    if (sn[NS] & NS_LFN) {          /* When LFN is to be created, allocate entries for an SFN + LFNs. */
        for (n = 0; lfn[n]; n++) ;
        ne = (n + 25) / 13;
    } else {                        /* Otherwise allocate an entry for an SFN  */
        ne = 1;
    }
    res = dir_alloc(dp, ne);        /* Allocate entries */

    if (res == FR_OK && --ne) {     /* Set LFN entry if needed */
        res = dir_sdi(dp, (WORD)(dp->index - ne));
        if (res == FR_OK) {
            sum = sum_sfn(dp->fn);  /* Sum value of the SFN tied to the LFN */
            do {                    /* Store LFN entries in bottom first */
                res = move_window(dp->fs, dp->sect);
                if (res != FR_OK) break;
                fit_lfn(dp->lfn, dp->dir, (BYTE)ne, sum);
                dp->fs->wflag = 1;
                res = dir_next(dp, 0);  /* Next entry */
            } while (res == FR_OK && --ne);
        }
    }
#else   /* Non LFN configuration */
    res = dir_alloc(dp, 1);     /* Allocate an entry for SFN */
#endif

    if (res == FR_OK) {             /* Set SFN entry */
        res = move_window(dp->fs, dp->sect);
        if (res == FR_OK) {
            mem_set(dp->dir, 0, SZ_DIR);    /* Clean the entry */
            mem_cpy(dp->dir, dp->fn, 11);   /* Put SFN */
#if _USE_LFN
            dp->dir[DIR_NTres] = dp->fn[NS] & (NS_BODY | NS_EXT);   /* Put NT flag */
#endif
            dp->fs->wflag = 1;
        }
    }

    return res;
}
#endif /* !_FS_READONLY */

#if !_FS_READONLY && !_FS_MINIMIZE

static FRESULT dir_remove(DIR* dp) {
    FRESULT res;
#if _USE_LFN    /* LFN configuration */
    WORD i;

    i = dp->index;  /* SFN index */
    res = dir_sdi(dp, (WORD)((dp->lfn_idx == 0xFFFF) ? i : dp->lfn_idx));   /* Goto the SFN or top of the LFN entries */
    if (res == FR_OK) {
        do {
            res = move_window(dp->fs, dp->sect);
            if (res != FR_OK) break;
            *dp->dir = DDE;         /* Mark the entry "deleted" */
            dp->fs->wflag = 1;
            if (dp->index >= i) break;  /* When reached SFN, all entries of the object has been deleted. */
            res = dir_next(dp, 0);      /* Next entry */
        } while (res == FR_OK);
        if (res == FR_NO_FILE) res = FR_INT_ERR;
    }

#else           /* Non LFN configuration */
    res = dir_sdi(dp, dp->index);
    if (res == FR_OK) {
        res = move_window(dp->fs, dp->sect);
        if (res == FR_OK) {
            *dp->dir = DDE;         /* Mark the entry "deleted" */
            dp->fs->wflag = 1;
        }
    }
#endif

    return res;
}
#endif /* !_FS_READONLY && !_FS_MINIMIZE */

static FRESULT create_name(DIR* dp, const TCHAR** path) {
#if _USE_LFN    /* LFN configuration */
    BYTE b, cf;
    WCHAR w, *lfn;
    UINT i, ni, si, di;
    const TCHAR *p;

    /* Create LFN in Unicode */
    for (p = *path; *p == '/' || *p == '\\'; p++) ; /* Strip duplicated separator */
    lfn = dp->lfn;
    si = di = 0;
    for (;;) {
        w = p[si++];                    /* Get a character */
        if (w < ' ' || w == '/' || w == '\\') break;    /* Break on end of segment */
        if (di >= _MAX_LFN)             /* Reject too long name */
            return FR_INVALID_NAME;
#if !_LFN_UNICODE
        w &= 0xFF;
        if (IsDBCS1(w)) {               /* Check if it is a DBC 1st byte (always false on SBCS cfg) */
            b = (BYTE)p[si++];          /* Get 2nd byte */
            if (!IsDBCS2(b))
                return FR_INVALID_NAME; /* Reject invalid sequence */
            w = (w << 8) + b;           /* Create a DBC */
        }
        w = ff_convert(w, 1);           /* Convert ANSI/OEM to Unicode */
        if (!w) return FR_INVALID_NAME; /* Reject invalid code */
#endif
        if (w < 0x80 && chk_chr("\"*:<>\?|\x7F", w)) /* Reject illegal characters for LFN */
            return FR_INVALID_NAME;
        lfn[di++] = w;                  /* Store the Unicode character */
    }
    *path = &p[si];                     /* Return pointer to the next segment */
    cf = (w < ' ') ? NS_LAST : 0;       /* Set last segment flag if end of path */
#if _FS_RPATH
    if ((di == 1 && lfn[di-1] == '.') || /* Is this a dot entry? */
        (di == 2 && lfn[di-1] == '.' && lfn[di-2] == '.')) {
        lfn[di] = 0;
        for (i = 0; i < 11; i++)
            dp->fn[i] = (i < di) ? '.' : ' ';
        dp->fn[i] = cf | NS_DOT;        /* This is a dot entry */
        return FR_OK;
    }
#endif
    while (di) {                        /* Strip trailing spaces and dots */
        w = lfn[di-1];
        if (w != ' ' && w != '.') break;
        di--;
    }
    if (!di) return FR_INVALID_NAME;    /* Reject nul string */

    lfn[di] = 0;                        /* LFN is created */

    /* Create SFN in directory form */
    mem_set(dp->fn, ' ', 11);
    for (si = 0; lfn[si] == ' ' || lfn[si] == '.'; si++) ;  /* Strip leading spaces and dots */
    if (si) cf |= NS_LOSS | NS_LFN;
    while (di && lfn[di - 1] != '.') di--;  /* Find extension (di<=si: no extension) */

    b = i = 0; ni = 8;
    for (;;) {
        w = lfn[si++];                  /* Get an LFN character */
        if (!w) break;                  /* Break on end of the LFN */
        if (w == ' ' || (w == '.' && si != di)) {   /* Remove spaces and dots */
            cf |= NS_LOSS | NS_LFN; continue;
        }

        if (i >= ni || si == di) {      /* Extension or end of SFN */
            if (ni == 11) {             /* Long extension */
                cf |= NS_LOSS | NS_LFN; break;
            }
            if (si != di) cf |= NS_LOSS | NS_LFN;   /* Out of 8.3 format */
            if (si > di) break;         /* No extension */
            si = di; i = 8; ni = 11;    /* Enter extension section */
            b <<= 2; continue;
        }

        if (w >= 0x80) {                /* Non ASCII character */
#ifdef _EXCVT
            w = ff_convert(w, 0);       /* Unicode -> OEM code */
            if (w) w = ExCvt[w - 0x80]; /* Convert extended character to upper (SBCS) */
#else
            w = ff_convert(ff_wtoupper(w), 0);  /* Upper converted Unicode -> OEM code */
#endif
            cf |= NS_LFN;               /* Force create LFN entry */
        }

        if (_DF1S && w >= 0x100) {      /* Double byte character (always false on SBCS cfg) */
            if (i >= ni - 1) {
                cf |= NS_LOSS | NS_LFN; i = ni; continue;
            }
            dp->fn[i++] = (BYTE)(w >> 8);
        } else {                        /* Single byte character */
            if (!w || chk_chr("+,;=[]", w)) {   /* Replace illegal characters for SFN */
                w = '_'; cf |= NS_LOSS | NS_LFN;/* Lossy conversion */
            } else {
                if (IsUpper(w)) {       /* ASCII large capital */
                    b |= 2;
                } else {
                    if (IsLower(w)) {   /* ASCII small capital */
                        b |= 1; w -= 0x20;
                    }
                }
            }
        }
        dp->fn[i++] = (BYTE)w;
    }

    if (dp->fn[0] == DDE) dp->fn[0] = NDDE; /* If the first character collides with deleted mark, replace it with 0x05 */

    if (ni == 8) b <<= 2;
    if ((b & 0x0C) == 0x0C || (b & 0x03) == 0x03)   /* Create LFN entry when there are composite capitals */
        cf |= NS_LFN;
    if (!(cf & NS_LFN)) {                       /* When LFN is in 8.3 format without extended character, NT flags are created */
        if ((b & 0x03) == 0x01) cf |= NS_EXT;   /* NT flag (Extension has only small capital) */
        if ((b & 0x0C) == 0x04) cf |= NS_BODY;  /* NT flag (Filename has only small capital) */
    }

    dp->fn[NS] = cf;    /* SFN is created */

    return FR_OK;


#else   /* Non-LFN configuration */
    BYTE b, c, d, *sfn;
    UINT ni, si, i;
    const char *p;

    /* Create file name in directory form */
    for (p = *path; *p == '/' || *p == '\\'; p++) ; /* Strip duplicated separator */
    sfn = dp->fn;
    mem_set(sfn, ' ', 11);
    si = i = b = 0; ni = 8;
#if _FS_RPATH
    if (p[si] == '.') { /* Is this a dot entry? */
        for (;;) {
            c = (BYTE)p[si++];
            if (c != '.' || si >= 3) break;
            sfn[i++] = c;
        }
        if (c != '/' && c != '\\' && c > ' ') return FR_INVALID_NAME;
        *path = &p[si];                                 /* Return pointer to the next segment */
        sfn[NS] = (c <= ' ') ? NS_LAST | NS_DOT : NS_DOT;   /* Set last segment flag if end of path */
        return FR_OK;
    }
#endif
    for (;;) {
        c = (BYTE)p[si++];
        if (c <= ' ' || c == '/' || c == '\\') break;   /* Break on end of segment */
        if (c == '.' || i >= ni) {
            if (ni != 8 || c != '.') return FR_INVALID_NAME;
            i = 8; ni = 11;
            b <<= 2; continue;
        }
        if (c >= 0x80) {                /* Extended character? */
            b |= 3;                     /* Eliminate NT flag */
#ifdef _EXCVT
            c = ExCvt[c - 0x80];        /* To upper extended characters (SBCS cfg) */
#else
#if !_DF1S
            return FR_INVALID_NAME;     /* Reject extended characters (ASCII cfg) */
#endif
#endif
        }
        if (IsDBCS1(c)) {               /* Check if it is a DBC 1st byte (always false on SBCS cfg) */
            d = (BYTE)p[si++];          /* Get 2nd byte */
            if (!IsDBCS2(d) || i >= ni - 1) /* Reject invalid DBC */
                return FR_INVALID_NAME;
            sfn[i++] = c;
            sfn[i++] = d;
        } else {                        /* Single byte code */
            if (chk_chr("\"*+,:;<=>\?[]|\x7F", c))  /* Reject illegal chrs for SFN */
                return FR_INVALID_NAME;
            if (IsUpper(c)) {           /* ASCII large capital? */
                b |= 2;
            } else {
                if (IsLower(c)) {       /* ASCII small capital? */
                    b |= 1; c -= 0x20;
                }
            }
            sfn[i++] = c;
        }
    }
    *path = &p[si];                     /* Return pointer to the next segment */
    c = (c <= ' ') ? NS_LAST : 0;       /* Set last segment flag if end of path */

    if (!i) return FR_INVALID_NAME;     /* Reject nul string */
    if (sfn[0] == DDE) sfn[0] = NDDE;   /* When first character collides with DDE, replace it with 0x05 */

    if (ni == 8) b <<= 2;
    if ((b & 0x03) == 0x01) c |= NS_EXT;    /* NT flag (Name extension has only small capital) */
    if ((b & 0x0C) == 0x04) c |= NS_BODY;   /* NT flag (Name body has only small capital) */

    sfn[NS] = c;        /* Store NT flag, File name is created */

    return FR_OK;
#endif
}

#if _FS_MINIMIZE <= 1 || _FS_RPATH >= 2

static void get_fileinfo(DIR* dp, FILINFO* fno) {
    UINT i;
    TCHAR *p, c;


    p = fno->fname;
    if (dp->sect) {     /* Get SFN */
        BYTE *dir = dp->dir;

        i = 0;
        while (i < 11) {        /* Copy name body and extension */
            c = (TCHAR)dir[i++];
            if (c == ' ') continue;         /* Skip padding spaces */
            if (c == NDDE) c = (TCHAR)DDE;  /* Restore replaced DDE character */
            if (i == 9) *p++ = '.';         /* Insert a . if extension is exist */
#if _USE_LFN
            if (IsUpper(c) && (dir[DIR_NTres] & (i >= 9 ? NS_EXT : NS_BODY)))
                c += 0x20;          /* To lower */
#if _LFN_UNICODE
            if (IsDBCS1(c) && i != 8 && i != 11 && IsDBCS2(dir[i]))
                c = c << 8 | dir[i++];
            c = ff_convert(c, 1);   /* OEM -> Unicode */
            if (!c) c = '?';
#endif
#endif
            *p++ = c;
        }
        fno->fattrib = dir[DIR_Attr];               /* Attribute */
        fno->fsize = LD_DWORD(dir+DIR_FileSize);    /* Size */
        fno->fdate = LD_WORD(dir+DIR_WrtDate);      /* Date */
        fno->ftime = LD_WORD(dir+DIR_WrtTime);      /* Time */
    }
    *p = 0;     /* Terminate SFN string by a \0 */

#if _USE_LFN
    if (fno->lfname) {
        WCHAR w, *lfn;

        i = 0; p = fno->lfname;
        if (dp->sect && fno->lfsize && dp->lfn_idx != 0xFFFF) { /* Get LFN if available */
            lfn = dp->lfn;
            while ((w = *lfn++) != 0) {     /* Get an LFN character */
#if !_LFN_UNICODE
                w = ff_convert(w, 0);       /* Unicode -> OEM */
                if (!w) { i = 0; break; }   /* No LFN if it could not be converted */
                if (_DF1S && w >= 0x100)    /* Put 1st byte if it is a DBC (always false on SBCS cfg) */
                    p[i++] = (TCHAR)(w >> 8);
#endif
                if (i >= fno->lfsize - 1) { i = 0; break; } /* No LFN if buffer overflow */
                p[i++] = (TCHAR)w;
            }
        }
        p[i] = 0;   /* Terminate LFN string by a \0 */
    }
#endif
}
#endif /* _FS_MINIMIZE <= 1 || _FS_RPATH >= 2*/

static int get_ldnumber(const TCHAR** path) {
    int vol = -1;


    if (*path) {
        vol = (*path)[0] - '0';
        if ((UINT)vol < 9 && (*path)[1] == ':') {   /* There is a drive number */
            *path += 2;     /* Get value and strip it */
            if (vol >= _VOLUMES) vol = -1;  /* Check if the drive number is valid */
        } else {            /* No drive number use default drive */
#if _FS_RPATH && _VOLUMES >= 2
            vol = CurrVol;  /* Current drive */
#else
            vol = 0;        /* Drive 0 */
#endif
        }
    }

    return vol;
}

static FRESULT follow_path(DIR* dp, const TCHAR* path) {
    FRESULT res;
    BYTE *dir, ns;


#if _FS_RPATH
    if (*path == '/' || *path == '\\') {    /* There is a heading separator */
        path++; dp->sclust = 0;             /* Strip it and start from the root directory */
    } else {                                /* No heading separator */
        dp->sclust = dp->fs->cdir;          /* Start from the current directory */
    }
#else
    if (*path == '/' || *path == '\\')      /* Strip heading separator if exist */
        path++;
    dp->sclust = 0;                         /* Always start from the root directory */
#endif

    if ((UINT)*path < ' ') {                /* Null path name is the origin directory itself */
        res = dir_sdi(dp, 0);
        dp->dir = 0;
    } else {                                /* Follow path */
        for (;;) {
            res = create_name(dp, &path);   /* Get a segment name of the path */
            if (res != FR_OK) break;
            res = dir_find(dp);             /* Find an object with the sagment name */
            ns = dp->fn[NS];
            if (res != FR_OK) {             /* Failed to find the object */
                if (res == FR_NO_FILE) {    /* Object is not found */
                    if (_FS_RPATH && (ns & NS_DOT)) {   /* If dot entry is not exist, */
                        dp->sclust = 0; dp->dir = 0;    /* it is the root directory and stay there */
                        if (!(ns & NS_LAST)) continue;  /* Continue to follow if not last segment */
                        res = FR_OK;                    /* Ended at the root directroy. Function completed. */
                    } else {                            /* Could not find the object */
                        if (!(ns & NS_LAST)) res = FR_NO_PATH;  /* Adjust error code if not last segment */
                    }
                }
                break;
            }
            if (ns & NS_LAST) break;            /* Last segment matched. Function completed. */
            dir = dp->dir;                      /* Follow the sub-directory */
            if (!(dir[DIR_Attr] & AM_DIR)) {    /* It is not a sub-directory and cannot follow */
                res = FR_NO_PATH; break;
            }
            dp->sclust = ld_clust(dp->fs, dir);
        }
    }

    return res;
}

static BYTE check_fs(FATFS* fs, DWORD sect) {
    fs->wflag = 0;
    fs->winsect = 0xFFFFFFFF; /* Invaidate window */
    if (move_window(fs, sect) != FR_OK) /* Load boot record */
        return 3;

    if (LD_WORD(&fs->win[BS_55AA]) != 0xAA55)   /* Check boot record signature (always placed at offset 510 even if the sector size is >512) */
        return 2;

    if ((LD_DWORD(&fs->win[BS_FilSysType]) & 0xFFFFFF) == 0x544146)     /* Check "FAT" string */
        return 0;
    if ((LD_DWORD(&fs->win[BS_FilSysType32]) & 0xFFFFFF) == 0x544146)   /* Check "FAT" string */
        return 0;

    return 1;
}

static FRESULT find_volume(FATFS** rfs, const TCHAR** path, BYTE wmode) {
    BYTE fmt;
    int vol;
    DSTATUS stat;
    DWORD bsect, fasize, tsect, sysect, nclst, szbfat;
    WORD nrsv;
    FATFS *fs;


    /* Get logical drive number from the path name */
    *rfs = 0;
    vol = get_ldnumber(path);
    if (vol < 0) return FR_INVALID_DRIVE;

    /* Check if the file system object is valid or not */
    fs = FatFs[vol];                    /* Get pointer to the file system object */
    if (!fs) return FR_NOT_ENABLED;     /* Is the file system object available? */

    ENTER_FF(fs);                       /* Lock the volume */
    *rfs = fs;                          /* Return pointer to the file system object */

    if (fs->fs_type) {                  /* If the volume has been mounted */
        stat = disk_status(fs->drv);
        if (!(stat & STA_NOINIT)) {     /* and the physical drive is kept initialized */
            if (!_FS_READONLY && wmode && (stat & STA_PROTECT)) /* Check write protection if needed */
                return FR_WRITE_PROTECTED;
            return FR_OK;               /* The file system object is valid */
        }
    }

    /* The file system object is not valid. */
    /* Following code attempts to mount the volume. (analyze BPB and initialize the fs object) */

    fs->fs_type = 0;                    /* Clear the file system object */
    fs->drv = LD2PD(vol);               /* Bind the logical drive and a physical drive */
    stat = disk_initialize(fs->drv);    /* Initialize the physical drive */
    if (stat & STA_NOINIT)              /* Check if the initialization succeeded */
        return FR_NOT_READY;            /* Failed to initialize due to no medium or hard error */
    if (!_FS_READONLY && wmode && (stat & STA_PROTECT)) /* Check disk write protection if needed */
        return FR_WRITE_PROTECTED;
#if _MAX_SS != 512                      /* Get sector size (variable sector size cfg only) */
    if (disk_ioctl(fs->drv, GET_SECTOR_SIZE, &fs->ssize) != RES_OK)
        return FR_DISK_ERR;
#endif
    /* Find an FAT partition on the drive. Supports only generic partitioning, FDISK and SFD. */
    bsect = 0;
    fmt = check_fs(fs, bsect);                  /* Load sector 0 and check if it is an FAT boot sector as SFD */
    if (fmt == 1 || (!fmt && (LD2PT(vol)))) {   /* Not an FAT boot sector or forced partition number */
        UINT i;
        DWORD br[4];

        for (i = 0; i < 4; i++) {           /* Get partition offset */
            BYTE *pt = fs->win+MBR_Table + i * SZ_PTE;
            br[i] = pt[4] ? LD_DWORD(&pt[8]) : 0;
        }
        i = LD2PT(vol);                     /* Partition number: 0:auto, 1-4:forced */
        if (i) i--;
        do {                                /* Find an FAT volume */
            bsect = br[i];
            fmt = bsect ? check_fs(fs, bsect) : 2;  /* Check the partition */
        } while (!LD2PT(vol) && fmt && ++i < 4);
    }
    if (fmt == 3) return FR_DISK_ERR;       /* An error occured in the disk I/O layer */
    if (fmt) return FR_NO_FILESYSTEM;       /* No FAT volume is found */

    /* An FAT volume is found. Following code initializes the file system object */

    if (LD_WORD(fs->win+BPB_BytsPerSec) != SS(fs))      /* (BPB_BytsPerSec must be equal to the physical sector size) */
        return FR_NO_FILESYSTEM;

    fasize = LD_WORD(fs->win+BPB_FATSz16);              /* Number of sectors per FAT */
    if (!fasize) fasize = LD_DWORD(fs->win+BPB_FATSz32);
    fs->fsize = fasize;

    fs->n_fats = fs->win[BPB_NumFATs];                  /* Number of FAT copies */
    if (fs->n_fats != 1 && fs->n_fats != 2)             /* (Must be 1 or 2) */
        return FR_NO_FILESYSTEM;
    fasize *= fs->n_fats;                               /* Number of sectors for FAT area */

    fs->csize = fs->win[BPB_SecPerClus];                /* Number of sectors per cluster */
    if (!fs->csize || (fs->csize & (fs->csize - 1)))    /* (Must be power of 2) */
        return FR_NO_FILESYSTEM;

    fs->n_rootdir = LD_WORD(fs->win+BPB_RootEntCnt);    /* Number of root directory entries */
    if (fs->n_rootdir % (SS(fs) / SZ_DIR))              /* (Must be sector aligned) */
        return FR_NO_FILESYSTEM;

    tsect = LD_WORD(fs->win+BPB_TotSec16);              /* Number of sectors on the volume */
    if (!tsect) tsect = LD_DWORD(fs->win+BPB_TotSec32);

    nrsv = LD_WORD(fs->win+BPB_RsvdSecCnt);             /* Number of reserved sectors */
    if (!nrsv) return FR_NO_FILESYSTEM;                 /* (Must not be 0) */

    /* Determine the FAT sub type */
    sysect = nrsv + fasize + fs->n_rootdir / (SS(fs) / SZ_DIR); /* RSV+FAT+DIR */
    if (tsect < sysect) return FR_NO_FILESYSTEM;        /* (Invalid volume size) */
    nclst = (tsect - sysect) / fs->csize;               /* Number of clusters */
    if (!nclst) return FR_NO_FILESYSTEM;                /* (Invalid volume size) */
    fmt = FS_FAT12;
    if (nclst >= MIN_FAT16) fmt = FS_FAT16;
    if (nclst >= MIN_FAT32) fmt = FS_FAT32;

    /* Boundaries and Limits */
    fs->n_fatent = nclst + 2;                           /* Number of FAT entries */
    fs->volbase = bsect;                                /* Volume start sector */
    fs->fatbase = bsect + nrsv;                         /* FAT start sector */
    fs->database = bsect + sysect;                      /* Data start sector */
    if (fmt == FS_FAT32) {
        if (fs->n_rootdir) return FR_NO_FILESYSTEM;     /* (BPB_RootEntCnt must be 0) */
        fs->dirbase = LD_DWORD(fs->win+BPB_RootClus);   /* Root directory start cluster */
        szbfat = fs->n_fatent * 4;                      /* (Required FAT size) */
    } else {
        if (!fs->n_rootdir) return FR_NO_FILESYSTEM;    /* (BPB_RootEntCnt must not be 0) */
        fs->dirbase = fs->fatbase + fasize;             /* Root directory start sector */
        szbfat = (fmt == FS_FAT16) ?                    /* (Required FAT size) */
            fs->n_fatent * 2 : fs->n_fatent * 3 / 2 + (fs->n_fatent & 1);
    }
    if (fs->fsize < (szbfat + (SS(fs) - 1)) / SS(fs))   /* (BPB_FATSz must not be less than required) */
        return FR_NO_FILESYSTEM;

#if !_FS_READONLY
    /* Initialize cluster allocation information */
    fs->last_clust = fs->free_clust = 0xFFFFFFFF;

    /* Get fsinfo if available */
    fs->fsi_flag = 0x80;
    if (fmt == FS_FAT32             /* Enable FSINFO only if FAT32 and BPB_FSInfo is 1 */
        && LD_WORD(fs->win+BPB_FSInfo) == 1
        && move_window(fs, bsect + 1) == FR_OK)
    {
        fs->fsi_flag = 0;
        if (LD_WORD(fs->win+BS_55AA) == 0xAA55  /* Load FSINFO data if available */
            && LD_DWORD(fs->win+FSI_LeadSig) == 0x41615252
            && LD_DWORD(fs->win+FSI_StrucSig) == 0x61417272)
        {
#if !_FS_NOFSINFO
            fs->free_clust = LD_DWORD(fs->win+FSI_Free_Count);
#endif
            fs->last_clust = LD_DWORD(fs->win+FSI_Nxt_Free);
        }
    }
#endif
    fs->fs_type = fmt;  /* FAT sub-type */
    fs->id = ++Fsid;    /* File system mount ID */
#if _FS_RPATH
    fs->cdir = 0;       /* Current directory (root dir) */
#endif
#if _FS_LOCK            /* Clear file lock semaphores */
    clear_lock(fs);
#endif

    return FR_OK;
}

static FRESULT validate(void* obj) {
    FIL *fil = (FIL*) obj; /* Assuming offset of .fs and .id in the FIL/DIR structure is identical */

    if (!fil || !fil->fs || !fil->fs->fs_type || fil->fs->id != fil->id)
        return FR_INVALID_OBJECT;

    ENTER_FF(fil->fs);      /* Lock file system */

    if (disk_status(fil->fs->drv) & STA_NOINIT)
        return FR_NOT_READY;

    return FR_OK;
}

FRESULT f_mount(FATFS* fs, const TCHAR* path, BYTE opt) {
    FATFS *cfs;
    int vol;
    FRESULT res;


    vol = get_ldnumber(&path);
    if (vol < 0) return FR_INVALID_DRIVE;
    cfs = FatFs[vol];                   /* Pointer to fs object */

    if (cfs) {
#if _FS_LOCK
        clear_lock(cfs);
#endif
#if _FS_REENTRANT                       /* Discard sync object of the current volume */
        if (!ff_del_syncobj(cfs->sobj)) return FR_INT_ERR;
#endif
        cfs->fs_type = 0;               /* Clear old fs object */
    }

    if (fs) {
        fs->fs_type = 0;                /* Clear new fs object */
#if _FS_REENTRANT                       /* Create sync object for the new volume */
        if (!ff_cre_syncobj(vol, &fs->sobj)) return FR_INT_ERR;
#endif
    }
    FatFs[vol] = fs;                    /* Register new fs object */

    if (!fs || opt != 1) return FR_OK;  /* Do not mount now, it will be mounted later */

    res = find_volume(&fs, &path, 0);   /* Force mounted the volume */
    LEAVE_FF(fs, res);
}

FRESULT f_open(FIL* fp, const TCHAR* path, BYTE mode) {
    FRESULT res;
    DIR dj;
    BYTE *dir;
    DEF_NAMEBUF;


    if (!fp) return FR_INVALID_OBJECT;
    fp->fs = 0;         /* Clear file object */

    /* Get logical drive number */
#if !_FS_READONLY
    mode &= FA_READ | FA_WRITE | FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW;
    res = find_volume(&dj.fs, &path, (BYTE)(mode & ~FA_READ));
#else
    mode &= FA_READ;
    res = find_volume(&dj.fs, &path, 0);
#endif
    if (res == FR_OK) {
        INIT_BUF(dj);
        res = follow_path(&dj, path);   /* Follow the file path */
        dir = dj.dir;
#if !_FS_READONLY   /* R/W configuration */
        if (res == FR_OK) {
            if (!dir)   /* Default directory itself */
                res = FR_INVALID_NAME;
#if _FS_LOCK
            else
                res = chk_lock(&dj, (mode & ~FA_READ) ? 1 : 0);
#endif
        }
        /* Create or Open a file */
        if (mode & (FA_CREATE_ALWAYS | FA_OPEN_ALWAYS | FA_CREATE_NEW)) {
            DWORD dw, cl;

            if (res != FR_OK) {                 /* No file, create new */
                if (res == FR_NO_FILE)          /* There is no file to open, create a new entry */
#if _FS_LOCK
                    res = enq_lock() ? dir_register(&dj) : FR_TOO_MANY_OPEN_FILES;
#else
                    res = dir_register(&dj);
#endif
                mode |= FA_CREATE_ALWAYS;       /* File is created */
                dir = dj.dir;                   /* New entry */
            }
            else {                              /* Any object is already existing */
                if (dir[DIR_Attr] & (AM_RDO | AM_DIR)) {    /* Cannot overwrite it (R/O or DIR) */
                    res = FR_DENIED;
                } else {
                    if (mode & FA_CREATE_NEW)   /* Cannot create as new file */
                        res = FR_EXIST;
                }
            }
            if (res == FR_OK && (mode & FA_CREATE_ALWAYS)) {    /* Truncate it if overwrite mode */
                dw = get_fattime();             /* Created time */
                ST_DWORD(dir+DIR_CrtTime, dw);
                dir[DIR_Attr] = 0;              /* Reset attribute */
                ST_DWORD(dir+DIR_FileSize, 0);  /* size = 0 */
                cl = ld_clust(dj.fs, dir);      /* Get start cluster */
                st_clust(dir, 0);               /* cluster = 0 */
                dj.fs->wflag = 1;
                if (cl) {                       /* Remove the cluster chain if exist */
                    dw = dj.fs->winsect;
                    res = remove_chain(dj.fs, cl);
                    if (res == FR_OK) {
                        dj.fs->last_clust = cl - 1; /* Reuse the cluster hole */
                        res = move_window(dj.fs, dw);
                    }
                }
            }
        }
        else {  /* Open an existing file */
            if (res == FR_OK) {                 /* Follow succeeded */
                if (dir[DIR_Attr] & AM_DIR) {   /* It is a directory */
                    res = FR_NO_FILE;
                } else {
                    if ((mode & FA_WRITE) && (dir[DIR_Attr] & AM_RDO)) /* R/O violation */
                        res = FR_DENIED;
                }
            }
        }
        if (res == FR_OK) {
            if (mode & FA_CREATE_ALWAYS)        /* Set file change flag if created or overwritten */
                mode |= FA__WRITTEN;
            fp->dir_sect = dj.fs->winsect;      /* Pointer to the directory entry */
            fp->dir_ptr = dir;
#if _FS_LOCK
            fp->lockid = inc_lock(&dj, (mode & ~FA_READ) ? 1 : 0);
            if (!fp->lockid) res = FR_INT_ERR;
#endif
        }

#else               /* R/O configuration */
        if (res == FR_OK) {                 /* Follow succeeded */
            dir = dj.dir;
            if (!dir) {                     /* Current directory itself */
                res = FR_INVALID_NAME;
            } else {
                if (dir[DIR_Attr] & AM_DIR) /* It is a directory */
                    res = FR_NO_FILE;
            }
        }
#endif
        FREE_BUF();

        if (res == FR_OK) {
            fp->flag = mode;                    /* File access mode */
            fp->err = 0;                        /* Clear error flag */
            fp->sclust = ld_clust(dj.fs, dir);  /* File start cluster */
            fp->fsize = LD_DWORD(dir+DIR_FileSize); /* File size */
            fp->fptr = 0;                       /* File pointer */
            fp->dsect = 0;
#if _USE_FASTSEEK
            fp->cltbl = 0;                      /* Normal seek mode */
#endif
            fp->fs = dj.fs;                     /* Validate file object */
            fp->id = fp->fs->id;
        }
    }

    LEAVE_FF(dj.fs, res);
}

FRESULT f_read(FIL* fp, void* buff, UINT btr, UINT* br) {
    FRESULT res;
    DWORD clst, sect, remain;
    UINT rcnt, cc;
    BYTE csect, *rbuff = (BYTE*)buff;


    *br = 0;    /* Clear read byte counter */

    res = validate(fp);                         /* Check validity */
    if (res != FR_OK) LEAVE_FF(fp->fs, res);
    if (fp->err)                                /* Check error */
        LEAVE_FF(fp->fs, (FRESULT)fp->err);
    if (!(fp->flag & FA_READ))                  /* Check access mode */
        LEAVE_FF(fp->fs, FR_DENIED);
    remain = fp->fsize - fp->fptr;
    if (btr > remain) btr = (UINT)remain;       /* Truncate btr by remaining bytes */

    for ( ;  btr;                               /* Repeat until all data read */
        rbuff += rcnt, fp->fptr += rcnt, *br += rcnt, btr -= rcnt) {
        if ((fp->fptr % SS(fp->fs)) == 0) {     /* On the sector boundary? */
            csect = (BYTE)(fp->fptr / SS(fp->fs) & (fp->fs->csize - 1));    /* Sector offset in the cluster */
            if (!csect) {                       /* On the cluster boundary? */
                if (fp->fptr == 0) {            /* On the top of the file? */
                    clst = fp->sclust;          /* Follow from the origin */
                } else {                        /* Middle or end of the file */
#if _USE_FASTSEEK
                    if (fp->cltbl)
                        clst = clmt_clust(fp, fp->fptr);    /* Get cluster# from the CLMT */
                    else
#endif
                        clst = get_fat(fp->fs, fp->clust);  /* Follow cluster chain on the FAT */
                }
                if (clst < 2) ABORT(fp->fs, FR_INT_ERR);
                if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
                fp->clust = clst;               /* Update current cluster */
            }
            sect = clust2sect(fp->fs, fp->clust);   /* Get current sector */
            if (!sect) ABORT(fp->fs, FR_INT_ERR);
            sect += csect;
            cc = btr / SS(fp->fs);              /* When remaining bytes >= sector size, */
            if (cc) {                           /* Read maximum contiguous sectors directly */
                if (csect + cc > fp->fs->csize) /* Clip at cluster boundary */
                    cc = fp->fs->csize - csect;
                if (disk_read(fp->fs->drv, rbuff, sect, cc))
                    ABORT(fp->fs, FR_DISK_ERR);
#if !_FS_READONLY && _FS_MINIMIZE <= 2          /* Replace one of the read sectors with cached data if it contains a dirty sector */
#if _FS_TINY
                if (fp->fs->wflag && fp->fs->winsect - sect < cc)
                    mem_cpy(rbuff + ((fp->fs->winsect - sect) * SS(fp->fs)), fp->fs->win, SS(fp->fs));
#else
                if ((fp->flag & FA__DIRTY) && fp->dsect - sect < cc)
                    mem_cpy(rbuff + ((fp->dsect - sect) * SS(fp->fs)), fp->buf, SS(fp->fs));
#endif
#endif
                rcnt = SS(fp->fs) * cc;         /* Number of bytes transferred */
                continue;
            }
#if !_FS_TINY
            if (fp->dsect != sect) {            /* Load data sector if not in cache */
#if !_FS_READONLY
                if (fp->flag & FA__DIRTY) {     /* Write-back dirty sector cache */
                    if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1))
                        ABORT(fp->fs, FR_DISK_ERR);
                    fp->flag &= ~FA__DIRTY;
                }
#endif
                if (disk_read(fp->fs->drv, fp->buf, sect, 1))   /* Fill sector cache */
                    ABORT(fp->fs, FR_DISK_ERR);
            }
#endif
            fp->dsect = sect;
        }
        rcnt = SS(fp->fs) - ((UINT)fp->fptr % SS(fp->fs));  /* Get partial sector data from sector buffer */
        if (rcnt > btr) rcnt = btr;
#if _FS_TINY
        if (move_window(fp->fs, fp->dsect))     /* Move sector window */
            ABORT(fp->fs, FR_DISK_ERR);
        mem_cpy(rbuff, &fp->fs->win[fp->fptr % SS(fp->fs)], rcnt);  /* Pick partial sector */
#else
        mem_cpy(rbuff, &fp->buf[fp->fptr % SS(fp->fs)], rcnt);  /* Pick partial sector */
#endif
    }

    LEAVE_FF(fp->fs, FR_OK);
}




#if !_FS_READONLY

FRESULT f_write(FIL* fp, const void *buff, UINT btw, UINT* bw) {
    FRESULT res;
    DWORD clst, sect;
    UINT wcnt, cc;
    const BYTE *wbuff = (const BYTE*)buff;
    BYTE csect;


    *bw = 0;    /* Clear write byte counter */

    res = validate(fp);                     /* Check validity */
    if (res != FR_OK) LEAVE_FF(fp->fs, res);
    if (fp->err)                            /* Check error */
        LEAVE_FF(fp->fs, (FRESULT)fp->err);
    if (!(fp->flag & FA_WRITE))             /* Check access mode */
        LEAVE_FF(fp->fs, FR_DENIED);
    if (fp->fptr + btw < fp->fptr) btw = 0; /* File size cannot reach 4GB */

    for ( ;  btw;                           /* Repeat until all data written */
        wbuff += wcnt, fp->fptr += wcnt, *bw += wcnt, btw -= wcnt) {
        if ((fp->fptr % SS(fp->fs)) == 0) { /* On the sector boundary? */
            csect = (BYTE)(fp->fptr / SS(fp->fs) & (fp->fs->csize - 1));    /* Sector offset in the cluster */
            if (!csect) {                   /* On the cluster boundary? */
                if (fp->fptr == 0) {        /* On the top of the file? */
                    clst = fp->sclust;      /* Follow from the origin */
                    if (clst == 0)          /* When no cluster is allocated, */
                        fp->sclust = clst = create_chain(fp->fs, 0);    /* Create a new cluster chain */
                } else {                    /* Middle or end of the file */
#if _USE_FASTSEEK
                    if (fp->cltbl)
                        clst = clmt_clust(fp, fp->fptr);    /* Get cluster# from the CLMT */
                    else
#endif
                        clst = create_chain(fp->fs, fp->clust); /* Follow or stretch cluster chain on the FAT */
                }
                if (clst == 0) break;       /* Could not allocate a new cluster (disk full) */
                if (clst == 1) ABORT(fp->fs, FR_INT_ERR);
                if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
                fp->clust = clst;           /* Update current cluster */
            }
#if _FS_TINY
            if (fp->fs->winsect == fp->dsect && sync_window(fp->fs))    /* Write-back sector cache */
                ABORT(fp->fs, FR_DISK_ERR);
#else
            if (fp->flag & FA__DIRTY) {     /* Write-back sector cache */
                if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1))
                    ABORT(fp->fs, FR_DISK_ERR);
                fp->flag &= ~FA__DIRTY;
            }
#endif
            sect = clust2sect(fp->fs, fp->clust);   /* Get current sector */
            if (!sect) ABORT(fp->fs, FR_INT_ERR);
            sect += csect;
            cc = btw / SS(fp->fs);          /* When remaining bytes >= sector size, */
            if (cc) {                       /* Write maximum contiguous sectors directly */
                if (csect + cc > fp->fs->csize) /* Clip at cluster boundary */
                    cc = fp->fs->csize - csect;
                if (disk_write(fp->fs->drv, wbuff, sect, cc))
                    ABORT(fp->fs, FR_DISK_ERR);
#if _FS_MINIMIZE <= 2
#if _FS_TINY
                if (fp->fs->winsect - sect < cc) {  /* Refill sector cache if it gets invalidated by the direct write */
                    mem_cpy(fp->fs->win, wbuff + ((fp->fs->winsect - sect) * SS(fp->fs)), SS(fp->fs));
                    fp->fs->wflag = 0;
                }
#else
                if (fp->dsect - sect < cc) { /* Refill sector cache if it gets invalidated by the direct write */
                    mem_cpy(fp->buf, wbuff + ((fp->dsect - sect) * SS(fp->fs)), SS(fp->fs));
                    fp->flag &= ~FA__DIRTY;
                }
#endif
#endif
                wcnt = SS(fp->fs) * cc;     /* Number of bytes transferred */
                continue;
            }
#if _FS_TINY
            if (fp->fptr >= fp->fsize) {    /* Avoid silly cache filling at growing edge */
                if (sync_window(fp->fs)) ABORT(fp->fs, FR_DISK_ERR);
                fp->fs->winsect = sect;
            }
#else
            if (fp->dsect != sect) {        /* Fill sector cache with file data */
                if (fp->fptr < fp->fsize &&
                    disk_read(fp->fs->drv, fp->buf, sect, 1))
                        ABORT(fp->fs, FR_DISK_ERR);
            }
#endif
            fp->dsect = sect;
        }
        wcnt = SS(fp->fs) - ((UINT)fp->fptr % SS(fp->fs));/* Put partial sector into file I/O buffer */
        if (wcnt > btw) wcnt = btw;
#if _FS_TINY
        if (move_window(fp->fs, fp->dsect)) /* Move sector window */
            ABORT(fp->fs, FR_DISK_ERR);
        mem_cpy(&fp->fs->win[fp->fptr % SS(fp->fs)], wbuff, wcnt);  /* Fit partial sector */
        fp->fs->wflag = 1;
#else
        mem_cpy(&fp->buf[fp->fptr % SS(fp->fs)], wbuff, wcnt);  /* Fit partial sector */
        fp->flag |= FA__DIRTY;
#endif
    }

    if (fp->fptr > fp->fsize) fp->fsize = fp->fptr; /* Update file size if needed */
    fp->flag |= FA__WRITTEN;                        /* Set file change flag */

    LEAVE_FF(fp->fs, FR_OK);
}
#endif /* !_FS_READONLY */

#if !_FS_READONLY

FRESULT f_sync(FIL* fp) {
    FRESULT res;
    DWORD tm;
    BYTE *dir;


    res = validate(fp);                 /* Check validity of the object */
    if (res == FR_OK) {
        if (fp->flag & FA__WRITTEN) {   /* Has the file been written? */
            /* Write-back dirty buffer */
#if !_FS_TINY
            if (fp->flag & FA__DIRTY) {
                if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1))
                    LEAVE_FF(fp->fs, FR_DISK_ERR);
                fp->flag &= ~FA__DIRTY;
            }
#endif
            /* Update the directory entry */
            res = move_window(fp->fs, fp->dir_sect);
            if (res == FR_OK) {
                dir = fp->dir_ptr;
                dir[DIR_Attr] |= AM_ARC;                    /* Set archive bit */
                ST_DWORD(dir+DIR_FileSize, fp->fsize);      /* Update file size */
                st_clust(dir, fp->sclust);                  /* Update start cluster */
                tm = get_fattime();                         /* Update updated time */
                ST_DWORD(dir+DIR_WrtTime, tm);
                ST_WORD(dir+DIR_LstAccDate, 0);
                fp->flag &= ~FA__WRITTEN;
                fp->fs->wflag = 1;
                res = sync_fs(fp->fs);
            }
        }
    }

    LEAVE_FF(fp->fs, res);
}
#endif /* !_FS_READONLY */

FRESULT f_close(FIL *fp) {
    FRESULT res;


#if _FS_READONLY
    res = validate(fp);
    {
#if _FS_REENTRANT
        FATFS *fs = 0;
        if (res == FR_OK) fs = fp->fs;  /* Get corresponding file system object */
#endif
        if (res == FR_OK) fp->fs = 0;   /* Invalidate file object */
        LEAVE_FF(fs, res);
    }
#else
    res = f_sync(fp);                   /* Flush cached data */
#if _FS_LOCK
    if (res == FR_OK) {                 /* Decrement open counter */
#if _FS_REENTRANT
        res = validate(fp);
        if (res == FR_OK) {
            res = dec_lock(fp->lockid);
            unlock_fs(fp->fs, FR_OK);
        }
#else
        res = dec_lock(fp->lockid);
#endif
    }
#endif
    if (res == FR_OK) fp->fs = 0;       /* Invalidate file object */
    return res;
#endif
}

#if _FS_RPATH >= 1 && _VOLUMES >= 2

FRESULT f_chdrive (
        const TCHAR* path
)
{
    int vol;


    vol = get_ldnumber(&path);
    if (vol < 0) return FR_INVALID_DRIVE;

    CurrVol = (BYTE)vol;

    return FR_OK;
}
#endif /* _FS_RPATH >= 1 && _VOLUMES >= 2 */

#if _FS_RPATH >= 1

FRESULT f_chdir (
        const TCHAR* path
)
{
    FRESULT res;
    DIR dj;
    DEF_NAMEBUF;


    /* Get logical drive number */
    res = find_volume(&dj.fs, &path, 0);
    if (res == FR_OK) {
        INIT_BUF(dj);
        res = follow_path(&dj, path);       /* Follow the path */
        FREE_BUF();
        if (res == FR_OK) {                 /* Follow completed */
            if (!dj.dir) {
                dj.fs->cdir = dj.sclust;    /* Start directory itself */
            } else {
                if (dj.dir[DIR_Attr] & AM_DIR)  /* Reached to the directory */
                    dj.fs->cdir = ld_clust(dj.fs, dj.dir);
                else
                    res = FR_NO_PATH;       /* Reached but a file */
            }
        }
        if (res == FR_NO_FILE) res = FR_NO_PATH;
    }

    LEAVE_FF(dj.fs, res);
}
#endif /* _FS_RPATH >= 1 */

#if _FS_RPATH >= 2

FRESULT f_getcwd (
        TCHAR* buff,
        UINT len
)
{
    FRESULT res;
    DIR dj;
    UINT i, n;
    DWORD ccl;
    TCHAR *tp;
    FILINFO fno;
    DEF_NAMEBUF;


    *buff = 0;
    /* Get logical drive number */
    res = find_volume(&dj.fs, (const TCHAR**)&buff, 0); /* Get current volume */
    if (res == FR_OK) {
        INIT_BUF(dj);
        i = len;            /* Bottom of buffer (directory stack base) */
        dj.sclust = dj.fs->cdir;            /* Start to follow upper directory from current directory */
        while ((ccl = dj.sclust) != 0) {    /* Repeat while current directory is a sub-directory */
            res = dir_sdi(&dj, 1);          /* Get parent directory */
            if (res != FR_OK) break;
            res = dir_read(&dj, 0);
            if (res != FR_OK) break;
            dj.sclust = ld_clust(dj.fs, dj.dir);    /* Goto parent directory */
            res = dir_sdi(&dj, 0);
            if (res != FR_OK) break;
            do {                            /* Find the entry links to the child directory */
                res = dir_read(&dj, 0);
                if (res != FR_OK) break;
                if (ccl == ld_clust(dj.fs, dj.dir)) break;  /* Found the entry */
                res = dir_next(&dj, 0); 
            } while (res == FR_OK);
            if (res == FR_NO_FILE) res = FR_INT_ERR;/* It cannot be 'not found'. */
            if (res != FR_OK) break;
#if _USE_LFN
            fno.lfname = buff;
            fno.lfsize = i;
#endif
            get_fileinfo(&dj, &fno);        /* Get the directory name and push it to the buffer */
            tp = fno.fname;
#if _USE_LFN
            if (*buff) tp = buff;
#endif
            for (n = 0; tp[n]; n++) ;
            if (i < n + 3) {
                res = FR_NOT_ENOUGH_CORE; break;
            }
            while (n) buff[--i] = tp[--n];
            buff[--i] = '/';
        }
        tp = buff;
        if (res == FR_OK) {
#if _VOLUMES >= 2
            *tp++ = '0' + CurrVol;          /* Put drive number */
            *tp++ = ':';
#endif
            if (i == len) {                 /* Root-directory */
                *tp++ = '/';
            } else {                        /* Sub-directroy */
                do      /* Add stacked path str */
                    *tp++ = buff[i++];
                while (i < len);
            }
        }
        *tp = 0;
        FREE_BUF();
    }

    LEAVE_FF(dj.fs, res);
}
#endif /* _FS_RPATH >= 2 */

#if _FS_MINIMIZE <= 2

FRESULT f_lseek(FIL* fp, DWORD ofs) {
    FRESULT res;


    res = validate(fp);                 /* Check validity of the object */
    if (res != FR_OK) LEAVE_FF(fp->fs, res);
    if (fp->err)                        /* Check error */
        LEAVE_FF(fp->fs, (FRESULT)fp->err);

#if _USE_FASTSEEK
    if (fp->cltbl) {    /* Fast seek */
        DWORD cl, pcl, ncl, tcl, dsc, tlen, ulen, *tbl;

        if (ofs == CREATE_LINKMAP) {    /* Create CLMT */
            tbl = fp->cltbl;
            tlen = *tbl++; ulen = 2;    /* Given table size and required table size */
            cl = fp->sclust;            /* Top of the chain */
            if (cl) {
                do {
                    /* Get a fragment */
                    tcl = cl; ncl = 0; ulen += 2;   /* Top, length and used items */
                    do {
                        pcl = cl; ncl++;
                        cl = get_fat(fp->fs, cl);
                        if (cl <= 1) ABORT(fp->fs, FR_INT_ERR);
                        if (cl == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
                    } while (cl == pcl + 1);
                    if (ulen <= tlen) {     /* Store the length and top of the fragment */
                        *tbl++ = ncl; *tbl++ = tcl;
                    }
                } while (cl < fp->fs->n_fatent);    /* Repeat until end of chain */
            }
            *fp->cltbl = ulen;  /* Number of items used */
            if (ulen <= tlen)
                *tbl = 0;       /* Terminate table */
            else
                res = FR_NOT_ENOUGH_CORE;   /* Given table size is smaller than required */

        } else {                        /* Fast seek */
            if (ofs > fp->fsize)        /* Clip offset at the file size */
                ofs = fp->fsize;
            fp->fptr = ofs;             /* Set file pointer */
            if (ofs) {
                fp->clust = clmt_clust(fp, ofs - 1);
                dsc = clust2sect(fp->fs, fp->clust);
                if (!dsc) ABORT(fp->fs, FR_INT_ERR);
                dsc += (ofs - 1) / SS(fp->fs) & (fp->fs->csize - 1);
                if (fp->fptr % SS(fp->fs) && dsc != fp->dsect) {    /* Refill sector cache if needed */
#if !_FS_TINY
#if !_FS_READONLY
                    if (fp->flag & FA__DIRTY) {     /* Write-back dirty sector cache */
                        if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1))
                            ABORT(fp->fs, FR_DISK_ERR);
                        fp->flag &= ~FA__DIRTY;
                    }
#endif
                    if (disk_read(fp->fs->drv, fp->buf, dsc, 1))    /* Load current sector */
                        ABORT(fp->fs, FR_DISK_ERR);
#endif
                    fp->dsect = dsc;
                }
            }
        }
    } else
#endif

    /* Normal Seek */
    {
        DWORD clst, bcs, nsect, ifptr;

        if (ofs > fp->fsize                 /* In read-only mode, clip offset with the file size */
#if !_FS_READONLY
             && !(fp->flag & FA_WRITE)
#endif
            ) ofs = fp->fsize;

        ifptr = fp->fptr;
        fp->fptr = nsect = 0;
        if (ofs) {
            bcs = (DWORD)fp->fs->csize * SS(fp->fs);    /* Cluster size (byte) */
            if (ifptr > 0 &&
                (ofs - 1) / bcs >= (ifptr - 1) / bcs) { /* When seek to same or following cluster, */
                fp->fptr = (ifptr - 1) & ~(bcs - 1);    /* start from the current cluster */
                ofs -= fp->fptr;
                clst = fp->clust;
            } else {                                    /* When seek to back cluster, */
                clst = fp->sclust;                      /* start from the first cluster */
#if !_FS_READONLY
                if (clst == 0) {                        /* If no cluster chain, create a new chain */
                    clst = create_chain(fp->fs, 0);
                    if (clst == 1) ABORT(fp->fs, FR_INT_ERR);
                    if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
                    fp->sclust = clst;
                }
#endif
                fp->clust = clst;
            }
            if (clst != 0) {
                while (ofs > bcs) {                     /* Cluster following loop */
#if !_FS_READONLY
                    if (fp->flag & FA_WRITE) {          /* Check if in write mode or not */
                        clst = create_chain(fp->fs, clst);  /* Force stretch if in write mode */
                        if (clst == 0) {                /* When disk gets full, clip file size */
                            ofs = bcs; break;
                        }
                    } else
#endif
                        clst = get_fat(fp->fs, clst);   /* Follow cluster chain if not in write mode */
                    if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
                    if (clst <= 1 || clst >= fp->fs->n_fatent) ABORT(fp->fs, FR_INT_ERR);
                    fp->clust = clst;
                    fp->fptr += bcs;
                    ofs -= bcs;
                }
                fp->fptr += ofs;
                if (ofs % SS(fp->fs)) {
                    nsect = clust2sect(fp->fs, clst);   /* Current sector */
                    if (!nsect) ABORT(fp->fs, FR_INT_ERR);
                    nsect += ofs / SS(fp->fs);
                }
            }
        }
        if (fp->fptr % SS(fp->fs) && nsect != fp->dsect) {  /* Fill sector cache if needed */
#if !_FS_TINY
#if !_FS_READONLY
            if (fp->flag & FA__DIRTY) {         /* Write-back dirty sector cache */
                if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1))
                    ABORT(fp->fs, FR_DISK_ERR);
                fp->flag &= ~FA__DIRTY;
            }
#endif
            if (disk_read(fp->fs->drv, fp->buf, nsect, 1))  /* Fill sector cache */
                ABORT(fp->fs, FR_DISK_ERR);
#endif
            fp->dsect = nsect;
        }
#if !_FS_READONLY
        if (fp->fptr > fp->fsize) {         /* Set file change flag if the file size is extended */
            fp->fsize = fp->fptr;
            fp->flag |= FA__WRITTEN;
        }
#endif
    }

    LEAVE_FF(fp->fs, res);
}
#endif /* _FS_MINIMIZE <= 2 */

#if _FS_MINIMIZE <= 1

FRESULT f_opendir(DIR* dp, const TCHAR* path) {
    FRESULT res;
    FATFS* fs;
    DEF_NAMEBUF;


    if (!dp) return FR_INVALID_OBJECT;

    /* Get logical drive number */
    res = find_volume(&fs, &path, 0);
    if (res == FR_OK) {
        dp->fs = fs;
        INIT_BUF(*dp);
        res = follow_path(dp, path);            /* Follow the path to the directory */
        FREE_BUF();
        if (res == FR_OK) {                     /* Follow completed */
            if (dp->dir) {                      /* It is not the origin directory itself */
                if (dp->dir[DIR_Attr] & AM_DIR) /* The object is a sub directory */
                    dp->sclust = ld_clust(fs, dp->dir);
                else                            /* The object is a file */
                    res = FR_NO_PATH;
            }
            if (res == FR_OK) {
                dp->id = fs->id;
                res = dir_sdi(dp, 0);           /* Rewind directory */
#if _FS_LOCK
                if (res == FR_OK) {
                    if (dp->sclust) {
                        dp->lockid = inc_lock(dp, 0);   /* Lock the sub directory */
                        if (!dp->lockid)
                            res = FR_TOO_MANY_OPEN_FILES;
                    } else {
                        dp->lockid = 0; /* Root directory need not to be locked */
                    }
                }
#endif
            }
        }
        if (res == FR_NO_FILE) res = FR_NO_PATH;
    }
    if (res != FR_OK) dp->fs = 0;       /* Invalidate the directory object if function faild */

    LEAVE_FF(fs, res);
}
#endif /* _FS_MINIMIZE <= 1 */

#if _FS_MINIMIZE <= 1

FRESULT f_closedir(DIR *dp) {
    FRESULT res;


    res = validate(dp);
#if _FS_LOCK
    if (res == FR_OK) {             /* Decrement open counter */
        if (dp->lockid)
            res = dec_lock(dp->lockid);
#if _FS_REENTRANT
        unlock_fs(dp->fs, FR_OK);
#endif
    }
#endif
    if (res == FR_OK) dp->fs = 0;   /* Invalidate directory object */
    return res;
}
#endif /* _FS_MINIMIZE <= 1 */

#if _FS_MINIMIZE <= 1

FRESULT f_readdir(DIR* dp, FILINFO* fno) {
    FRESULT res;
    DEF_NAMEBUF;


    res = validate(dp);                     /* Check validity of the object */
    if (res == FR_OK) {
        if (!fno) {
            res = dir_sdi(dp, 0);           /* Rewind the directory object */
        } else {
            INIT_BUF(*dp);
            res = dir_read(dp, 0);          /* Read an item */
            if (res == FR_NO_FILE) {        /* Reached end of directory */
                dp->sect = 0;
                res = FR_OK;
            }
            if (res == FR_OK) {             /* A valid entry is found */
                get_fileinfo(dp, fno);      /* Get the object information */
                res = dir_next(dp, 0);      /* Increment index for next */
                if (res == FR_NO_FILE) {
                    dp->sect = 0;
                    res = FR_OK;
                }
            }
            FREE_BUF();
        }
    }

    LEAVE_FF(dp->fs, res);
}
#endif /* _FS_MINIMIZE <= 1 */

#if _FS_MINIMIZE == 0

FRESULT f_stat(const TCHAR* path, FILINFO* fno) {
    FRESULT res;
    DIR dj;
    DEF_NAMEBUF;


    /* Get logical drive number */
    res = find_volume(&dj.fs, &path, 0);
    if (res == FR_OK) {
        INIT_BUF(dj);
        res = follow_path(&dj, path);   /* Follow the file path */
        if (res == FR_OK) {             /* Follow completed */
            if (dj.dir) {       /* Found an object */
                if (fno) get_fileinfo(&dj, fno);
            } else {            /* It is root directory */
                res = FR_INVALID_NAME;
            }
        }
        FREE_BUF();
    }

    LEAVE_FF(dj.fs, res);
}
#endif /* _FS_MINIMIZE == 0 */

#if _FS_MINIMIZE == 0 && !_FS_READONLY

FRESULT f_getfree(const TCHAR* path, DWORD* nclst, FATFS** fatfs) {
    FRESULT res;
    FATFS *fs;
    DWORD n, clst, sect, stat;
    UINT i;
    BYTE fat, *p;


    /* Get logical drive number */
    res = find_volume(fatfs, &path, 0);
    fs = *fatfs;
    if (res == FR_OK) {
        /* If free_clust is valid, return it without full cluster scan */
        if (fs->free_clust <= fs->n_fatent - 2) {
            *nclst = fs->free_clust;
        } else {
            /* Get number of free clusters */
            fat = fs->fs_type;
            n = 0;
            if (fat == FS_FAT12) {
                clst = 2;
                do {
                    stat = get_fat(fs, clst);
                    if (stat == 0xFFFFFFFF) { res = FR_DISK_ERR; break; }
                    if (stat == 1) { res = FR_INT_ERR; break; }
                    if (stat == 0) n++;
                } while (++clst < fs->n_fatent);
            } else {
                clst = fs->n_fatent;
                sect = fs->fatbase;
                i = 0; p = 0;
                do {
                    if (!i) {
                        res = move_window(fs, sect++);
                        if (res != FR_OK) break;
                        p = fs->win;
                        i = SS(fs);
                    }
                    if (fat == FS_FAT16) {
                        if (LD_WORD(p) == 0) n++;
                        p += 2; i -= 2;
                    } else {
                        if ((LD_DWORD(p) & 0x0FFFFFFF) == 0) n++;
                        p += 4; i -= 4;
                    }
                } while (--clst);
            }
            fs->free_clust = n;
            fs->fsi_flag |= 1;
            *nclst = n;
        }
    }
    LEAVE_FF(fs, res);
}
#endif /* _FS_MINIMIZE == 0 && !_FS_READONLY */

#if _FS_MINIMIZE == 0 && !_FS_READONLY

FRESULT f_truncate(FIL* fp) {
    FRESULT res;
    DWORD ncl;


    res = validate(fp);                     /* Check validity of the object */
    if (res == FR_OK) {
        if (fp->err) {                      /* Check error */
            res = (FRESULT)fp->err;
        } else {
            if (!(fp->flag & FA_WRITE))     /* Check access mode */
                res = FR_DENIED;
        }
    }
    if (res == FR_OK) {
        if (fp->fsize > fp->fptr) {
            fp->fsize = fp->fptr;   /* Set file size to current R/W point */
            fp->flag |= FA__WRITTEN;
            if (fp->fptr == 0) {    /* When set file size to zero, remove entire cluster chain */
                res = remove_chain(fp->fs, fp->sclust);
                fp->sclust = 0;
            } else {                /* When truncate a part of the file, remove remaining clusters */
                ncl = get_fat(fp->fs, fp->clust);
                res = FR_OK;
                if (ncl == 0xFFFFFFFF) res = FR_DISK_ERR;
                if (ncl == 1) res = FR_INT_ERR;
                if (res == FR_OK && ncl < fp->fs->n_fatent) {
                    res = put_fat(fp->fs, fp->clust, 0x0FFFFFFF);
                    if (res == FR_OK) res = remove_chain(fp->fs, ncl);
                }
            }
#if !_FS_TINY
            if (res == FR_OK && (fp->flag & FA__DIRTY)) {
                if (disk_write(fp->fs->drv, fp->buf, fp->dsect, 1))
                    res = FR_DISK_ERR;
                else
                    fp->flag &= ~FA__DIRTY;
            }
#endif
        }
        if (res != FR_OK) fp->err = (FRESULT)res;
    }

    LEAVE_FF(fp->fs, res);
}
#endif /* _FS_MINIMIZE == 0 && !_FS_READONLY */

#if _FS_MINIMIZE == 0 && !_FS_READONLY

FRESULT f_unlink(const TCHAR* path) {
    FRESULT res;
    DIR dj, sdj;
    BYTE *dir;
    DWORD dclst;
    DEF_NAMEBUF;


    /* Get logical drive number */
    res = find_volume(&dj.fs, &path, 1);
    if (res == FR_OK) {
        INIT_BUF(dj);
        res = follow_path(&dj, path);       /* Follow the file path */
        if (_FS_RPATH && res == FR_OK && (dj.fn[NS] & NS_DOT))
            res = FR_INVALID_NAME;          /* Cannot remove dot entry */
#if _FS_LOCK
        if (res == FR_OK) res = chk_lock(&dj, 2);   /* Cannot remove open file */
#endif
        if (res == FR_OK) {                 /* The object is accessible */
            dir = dj.dir;
            if (!dir) {
                res = FR_INVALID_NAME;      /* Cannot remove the start directory */
            } else {
                if (dir[DIR_Attr] & AM_RDO)
                    res = FR_DENIED;        /* Cannot remove R/O object */
            }
            dclst = ld_clust(dj.fs, dir);
            if (res == FR_OK && (dir[DIR_Attr] & AM_DIR)) { /* Is it a sub-dir? */
                if (dclst < 2) {
                    res = FR_INT_ERR;
                } else {
                    mem_cpy(&sdj, &dj, sizeof (DIR));   /* Check if the sub-directory is empty or not */
                    sdj.sclust = dclst;
                    res = dir_sdi(&sdj, 2);     /* Exclude dot entries */
                    if (res == FR_OK) {
                        res = dir_read(&sdj, 0);    /* Read an item */
                        if (res == FR_OK        /* Not empty directory */
#if _FS_RPATH
                        || dclst == dj.fs->cdir /* Current directory */
#endif
                        ) res = FR_DENIED;
                        if (res == FR_NO_FILE) res = FR_OK; /* Empty */
                    }
                }
            }
            if (res == FR_OK) {
                res = dir_remove(&dj);      /* Remove the directory entry */
                if (res == FR_OK) {
                    if (dclst)              /* Remove the cluster chain if exist */
                        res = remove_chain(dj.fs, dclst);
                    if (res == FR_OK) res = sync_fs(dj.fs);
                }
            }
        }
        FREE_BUF();
    }

    LEAVE_FF(dj.fs, res);
}
#endif /* _FS_MINIMIZE == 0 && !_FS_READONLY */

#if _FS_MINIMIZE == 0 && !_FS_READONLY

FRESULT f_mkdir(const TCHAR* path) {
    FRESULT res;
    DIR dj;
    BYTE *dir, n;
    DWORD dsc, dcl, pcl, tm = get_fattime();
    DEF_NAMEBUF;


    /* Get logical drive number */
    res = find_volume(&dj.fs, &path, 1);
    if (res == FR_OK) {
        INIT_BUF(dj);
        res = follow_path(&dj, path);           /* Follow the file path */
        if (res == FR_OK) res = FR_EXIST;       /* Any object with same name is already existing */
        if (_FS_RPATH && res == FR_NO_FILE && (dj.fn[NS] & NS_DOT))
            res = FR_INVALID_NAME;
        if (res == FR_NO_FILE) {                /* Can create a new directory */
            dcl = create_chain(dj.fs, 0);       /* Allocate a cluster for the new directory table */
            res = FR_OK;
            if (dcl == 0) res = FR_DENIED;      /* No space to allocate a new cluster */
            if (dcl == 1) res = FR_INT_ERR;
            if (dcl == 0xFFFFFFFF) res = FR_DISK_ERR;
            if (res == FR_OK)                   /* Flush FAT */
                res = sync_window(dj.fs);
            if (res == FR_OK) {                 /* Initialize the new directory table */
                dsc = clust2sect(dj.fs, dcl);
                dir = dj.fs->win;
                mem_set(dir, 0, SS(dj.fs));
                mem_set(dir+DIR_Name, ' ', 11); /* Create "." entry */
                dir[DIR_Name] = '.';
                dir[DIR_Attr] = AM_DIR;
                ST_DWORD(dir+DIR_WrtTime, tm);
                st_clust(dir, dcl);
                mem_cpy(dir+SZ_DIR, dir, SZ_DIR);   /* Create ".." entry */
                dir[SZ_DIR+1] = '.'; pcl = dj.sclust;
                if (dj.fs->fs_type == FS_FAT32 && pcl == dj.fs->dirbase)
                    pcl = 0;
                st_clust(dir+SZ_DIR, pcl);
                for (n = dj.fs->csize; n; n--) {    /* Write dot entries and clear following sectors */
                    dj.fs->winsect = dsc++;
                    dj.fs->wflag = 1;
                    res = sync_window(dj.fs);
                    if (res != FR_OK) break;
                    mem_set(dir, 0, SS(dj.fs));
                }
            }
            if (res == FR_OK) res = dir_register(&dj);  /* Register the object to the directoy */
            if (res != FR_OK) {
                remove_chain(dj.fs, dcl);           /* Could not register, remove cluster chain */
            } else {
                dir = dj.dir;
                dir[DIR_Attr] = AM_DIR;             /* Attribute */
                ST_DWORD(dir+DIR_WrtTime, tm);      /* Created time */
                st_clust(dir, dcl);                 /* Table start cluster */
                dj.fs->wflag = 1;
                res = sync_fs(dj.fs);
            }
        }
        FREE_BUF();
    }

    LEAVE_FF(dj.fs, res);
}
#endif /* _FS_MINIMIZE == 0 && !_FS_READONLY */

#if _FS_MINIMIZE == 0 && !_FS_READONLY

FRESULT f_chmod(const TCHAR* path, BYTE value, BYTE mask) {
    FRESULT res;
    DIR dj;
    BYTE *dir;
    DEF_NAMEBUF;


    /* Get logical drive number */
    res = find_volume(&dj.fs, &path, 1);
    if (res == FR_OK) {
        INIT_BUF(dj);
        res = follow_path(&dj, path);       /* Follow the file path */
        FREE_BUF();
        if (_FS_RPATH && res == FR_OK && (dj.fn[NS] & NS_DOT))
            res = FR_INVALID_NAME;
        if (res == FR_OK) {
            dir = dj.dir;
            if (!dir) {                     /* Is it a root directory? */
                res = FR_INVALID_NAME;
            } else {                        /* File or sub directory */
                mask &= AM_RDO|AM_HID|AM_SYS|AM_ARC;    /* Valid attribute mask */
                dir[DIR_Attr] = (value & mask) | (dir[DIR_Attr] & (BYTE)~mask); /* Apply attribute change */
                dj.fs->wflag = 1;
                res = sync_fs(dj.fs);
            }
        }
    }

    LEAVE_FF(dj.fs, res);
}
#endif /* _FS_MINIMIZE == 0 && !_FS_READONLY */

#if _FS_MINIMIZE == 0 && !_FS_READONLY

FRESULT f_utime(const TCHAR* path, const FILINFO* fno) {
    FRESULT res;
    DIR dj;
    BYTE *dir;
    DEF_NAMEBUF;


    /* Get logical drive number */
    res = find_volume(&dj.fs, &path, 1);
    if (res == FR_OK) {
        INIT_BUF(dj);
        res = follow_path(&dj, path);   /* Follow the file path */
        FREE_BUF();
        if (_FS_RPATH && res == FR_OK && (dj.fn[NS] & NS_DOT))
            res = FR_INVALID_NAME;
        if (res == FR_OK) {
            dir = dj.dir;
            if (!dir) {                 /* Root directory */
                res = FR_INVALID_NAME;
            } else {                    /* File or sub-directory */
                ST_WORD(dir+DIR_WrtTime, fno->ftime);
                ST_WORD(dir+DIR_WrtDate, fno->fdate);
                dj.fs->wflag = 1;
                res = sync_fs(dj.fs);
            }
        }
    }

    LEAVE_FF(dj.fs, res);
}
#endif /* _FS_MINIMIZE == 0 && !_FS_READONLY */

#if _FS_MINIMIZE == 0 && !_FS_READONLY

FRESULT f_rename(const TCHAR* path_old, const TCHAR* path_new) {
    FRESULT res;
    DIR djo, djn;
    BYTE buf[21], *dir;
    DWORD dw;
    DEF_NAMEBUF;


    /* Get logical drive number of the source object */
    res = find_volume(&djo.fs, &path_old, 1);
    if (res == FR_OK) {
        djn.fs = djo.fs;
        INIT_BUF(djo);
        res = follow_path(&djo, path_old);      /* Check old object */
        if (_FS_RPATH && res == FR_OK && (djo.fn[NS] & NS_DOT))
            res = FR_INVALID_NAME;
#if _FS_LOCK
        if (res == FR_OK) res = chk_lock(&djo, 2);
#endif
        if (res == FR_OK) {                     /* Old object is found */
            if (!djo.dir) {                     /* Is root dir? */
                res = FR_NO_FILE;
            } else {
                mem_cpy(buf, djo.dir+DIR_Attr, 21);     /* Save the object information except for name */
                mem_cpy(&djn, &djo, sizeof (DIR));      /* Check new object */
                res = follow_path(&djn, path_new);
                if (res == FR_OK) res = FR_EXIST;       /* The new object name is already existing */
                if (res == FR_NO_FILE) {                /* Is it a valid path and no name collision? */
/* Start critical section that any interruption can cause a cross-link */
                    res = dir_register(&djn);           /* Register the new entry */
                    if (res == FR_OK) {
                        dir = djn.dir;                  /* Copy object information except for name */
                        mem_cpy(dir+13, buf+2, 19);
                        dir[DIR_Attr] = buf[0] | AM_ARC;
                        djo.fs->wflag = 1;
                        if (djo.sclust != djn.sclust && (dir[DIR_Attr] & AM_DIR)) {     /* Update .. entry in the directory if needed */
                            dw = clust2sect(djo.fs, ld_clust(djo.fs, dir));
                            if (!dw) {
                                res = FR_INT_ERR;
                            } else {
                                res = move_window(djo.fs, dw);
                                dir = djo.fs->win+SZ_DIR;   /* .. entry */
                                if (res == FR_OK && dir[1] == '.') {
                                    dw = (djo.fs->fs_type == FS_FAT32 && djn.sclust == djo.fs->dirbase) ? 0 : djn.sclust;
                                    st_clust(dir, dw);
                                    djo.fs->wflag = 1;
                                }
                            }
                        }
                        if (res == FR_OK) {
                            res = dir_remove(&djo);     /* Remove old entry */
                            if (res == FR_OK)
                                res = sync_fs(djo.fs);
                        }
                    }
/* End critical section */
                }
            }
        }
        FREE_BUF();
    }

    LEAVE_FF(djo.fs, res);
}
#endif /* _FS_MINIMIZE == 0 && !_FS_READONLY */

#if _USE_LABEL

FRESULT f_getlabel (
        const TCHAR* path,
        TCHAR* label,
        DWORD* sn
)
{
    FRESULT res;
    DIR dj;
    UINT i, j;


    /* Get logical drive number */
    res = find_volume(&dj.fs, &path, 0);

    /* Get volume label */
    if (res == FR_OK && label) {
        dj.sclust = 0;                  /* Open root directory */
        res = dir_sdi(&dj, 0);
        if (res == FR_OK) {
            res = dir_read(&dj, 1);     /* Get an entry with AM_VOL */
            if (res == FR_OK) {         /* A volume label is exist */
#if _LFN_UNICODE
                WCHAR w;
                i = j = 0;
                do {
                    w = (i < 11) ? dj.dir[i++] : ' ';
                    if (IsDBCS1(w) && i < 11 && IsDBCS2(dj.dir[i]))
                        w = w << 8 | dj.dir[i++];
                    label[j++] = ff_convert(w, 1);  /* OEM -> Unicode */
                } while (j < 11);
#else
                mem_cpy(label, dj.dir, 11);
#endif
                j = 11;
                do {
                    label[j] = 0;
                    if (!j) break;
                } while (label[--j] == ' ');
            }
            if (res == FR_NO_FILE) {    /* No label, return nul string */
                label[0] = 0;
                res = FR_OK;
            }
        }
    }

    /* Get volume serial number */
    if (res == FR_OK && sn) {
        res = move_window(dj.fs, dj.fs->volbase);
        if (res == FR_OK) {
            i = dj.fs->fs_type == FS_FAT32 ? BS_VolID32 : BS_VolID;
            *sn = LD_DWORD(&dj.fs->win[i]);
        }
    }

    LEAVE_FF(dj.fs, res);
}
#endif /* _USE_LABEL */

#if _USE_LABEL && !_FS_READONLY

FRESULT f_setlabel (
        const TCHAR* label
)
{
    FRESULT res;
    DIR dj;
    BYTE vn[11];
    UINT i, j, sl;
    WCHAR w;
    DWORD tm;


    /* Get logical drive number */
    res = find_volume(&dj.fs, &label, 1);
    if (res) LEAVE_FF(dj.fs, res);

    /* Create a volume label in directory form */
    vn[0] = 0;
    for (sl = 0; label[sl]; sl++) ;             /* Get name length */
    for ( ; sl && label[sl-1] == ' '; sl--) ;   /* Remove trailing spaces */
    if (sl) {   /* Create volume label in directory form */
        i = j = 0;
        do {
#if _LFN_UNICODE
            w = ff_convert(ff_wtoupper(label[i++]), 0);
#else
            w = (BYTE)label[i++];
            if (IsDBCS1(w))
                w = (j < 10 && i < sl && IsDBCS2(label[i])) ? w << 8 | (BYTE)label[i++] : 0;
#if _USE_LFN
            w = ff_convert(ff_wtoupper(ff_convert(w, 1)), 0);
#else
            if (IsLower(w)) w -= 0x20;          /* To upper ASCII characters */
#ifdef _EXCVT
            if (w >= 0x80) w = ExCvt[w - 0x80]; /* To upper extended characters (SBCS cfg) */
#else
            if (!_DF1S && w >= 0x80) w = 0;     /* Reject extended characters (ASCII cfg) */
#endif
#endif
#endif
            if (!w || chk_chr("\"*+,.:;<=>\?[]|\x7F", w) || j >= (UINT)((w >= 0x100) ? 10 : 11)) /* Reject invalid characters for volume label */
                LEAVE_FF(dj.fs, FR_INVALID_NAME);
            if (w >= 0x100) vn[j++] = (BYTE)(w >> 8);
            vn[j++] = (BYTE)w;
        } while (i < sl);
        while (j < 11) vn[j++] = ' ';
    }

    /* Set volume label */
    dj.sclust = 0;                  /* Open root directory */
    res = dir_sdi(&dj, 0);
    if (res == FR_OK) {
        res = dir_read(&dj, 1);     /* Get an entry with AM_VOL */
        if (res == FR_OK) {         /* A volume label is found */
            if (vn[0]) {
                mem_cpy(dj.dir, vn, 11);    /* Change the volume label name */
                tm = get_fattime();
                ST_DWORD(dj.dir+DIR_WrtTime, tm);
            } else {
                dj.dir[0] = DDE;            /* Remove the volume label */
            }
            dj.fs->wflag = 1;
            res = sync_fs(dj.fs);
        } else {                    /* No volume label is found or error */
            if (res == FR_NO_FILE) {
                res = FR_OK;
                if (vn[0]) {                /* Create volume label as new */
                    res = dir_alloc(&dj, 1);    /* Allocate an entry for volume label */
                    if (res == FR_OK) {
                        mem_set(dj.dir, 0, SZ_DIR); /* Set volume label */
                        mem_cpy(dj.dir, vn, 11);
                        dj.dir[DIR_Attr] = AM_VOL;
                        tm = get_fattime();
                        ST_DWORD(dj.dir+DIR_WrtTime, tm);
                        dj.fs->wflag = 1;
                        res = sync_fs(dj.fs);
                    }
                }
            }
        }
    }

    LEAVE_FF(dj.fs, res);
}
#endif /* _USE_LABEL && !_FS_READONLY */

#if _USE_FORWARD && _FS_TINY

FRESULT f_forward (
        FIL* fp,
        UINT (*func)(const BYTE*, UINT),
        UINT btf,
        UINT* bf
)
{
    FRESULT res;
    DWORD remain, clst, sect;
    UINT rcnt;
    BYTE csect;


    *bf = 0;    /* Clear transfer byte counter */

    res = validate(fp);                             /* Check validity of the object */
    if (res != FR_OK) LEAVE_FF(fp->fs, res);
    if (fp->err)                                    /* Check error */
        LEAVE_FF(fp->fs, (FRESULT)fp->err);
    if (!(fp->flag & FA_READ))                      /* Check access mode */
        LEAVE_FF(fp->fs, FR_DENIED);

    remain = fp->fsize - fp->fptr;
    if (btf > remain) btf = (UINT)remain;           /* Truncate btf by remaining bytes */

    for ( ;  btf && (*func)(0, 0);                  /* Repeat until all data transferred or stream becomes busy */
        fp->fptr += rcnt, *bf += rcnt, btf -= rcnt) {
        csect = (BYTE)(fp->fptr / SS(fp->fs) & (fp->fs->csize - 1));    /* Sector offset in the cluster */
        if ((fp->fptr % SS(fp->fs)) == 0) {         /* On the sector boundary? */
            if (!csect) {                           /* On the cluster boundary? */
                clst = (fp->fptr == 0) ?            /* On the top of the file? */
                    fp->sclust : get_fat(fp->fs, fp->clust);
                if (clst <= 1) ABORT(fp->fs, FR_INT_ERR);
                if (clst == 0xFFFFFFFF) ABORT(fp->fs, FR_DISK_ERR);
                fp->clust = clst;                   /* Update current cluster */
            }
        }
        sect = clust2sect(fp->fs, fp->clust);       /* Get current data sector */
        if (!sect) ABORT(fp->fs, FR_INT_ERR);
        sect += csect;
        if (move_window(fp->fs, sect))              /* Move sector window */
            ABORT(fp->fs, FR_DISK_ERR);
        fp->dsect = sect;
        rcnt = SS(fp->fs) - (WORD)(fp->fptr % SS(fp->fs));  /* Forward data from sector window */
        if (rcnt > btf) rcnt = btf;
        rcnt = (*func)(&fp->fs->win[(WORD)fp->fptr % SS(fp->fs)], rcnt);
        if (!rcnt) ABORT(fp->fs, FR_INT_ERR);
    }

    LEAVE_FF(fp->fs, FR_OK);
}
#endif /* _USE_FORWARD && _FS_TINY */

#if _USE_MKFS && !_FS_READONLY
#define N_ROOTDIR   512     
#define N_FATS      1       
#endif /* _USE_MKFS && !_FS_READONLY */

#if _USE_MKFS && !_FS_READONLY

FRESULT f_mkfs(const TCHAR* path, BYTE sfd, UINT au) {
    static const WORD vst[] = { 1024, 512, 256, 128, 64, 32, 16, 8, 4, 2, 0 };
    static const WORD cst[] = { 32768, 16384, 8192, 4096, 2048, 16384, 8192,
                                4096, 2048, 1024, 512 };
    int vol;
    BYTE fmt, md, sys, *tbl, pdrv, part;
    DWORD n_clst, vs, n, wsect;
    UINT i;
    DWORD b_vol, b_fat, b_dir, b_data;  /* LBA */
    DWORD n_vol, n_rsv, n_fat, n_dir;   /* Size */
    FATFS *fs;
    DSTATUS stat;


    /* Check mounted drive and clear work area */
    vol = get_ldnumber(&path);
    if (vol < 0) return FR_INVALID_DRIVE;
    if (sfd > 1) return FR_INVALID_PARAMETER;
    if (au & (au - 1)) return FR_INVALID_PARAMETER;
    fs = FatFs[vol];
    if (!fs) return FR_NOT_ENABLED;
    fs->fs_type = 0;
    pdrv = LD2PD(vol);  /* Physical drive */
    part = LD2PT(vol);  /* Partition (0:auto detect, 1-4:get from partition table)*/

    /* Get disk statics */
    stat = disk_initialize(pdrv);
    if (stat & STA_NOINIT) return FR_NOT_READY;
    if (stat & STA_PROTECT) return FR_WRITE_PROTECTED;
#if _MAX_SS != 512                  /* Get disk sector size */
    if (disk_ioctl(pdrv, GET_SECTOR_SIZE, &SS(fs)) != RES_OK || SS(fs) > _MAX_SS)
        return FR_DISK_ERR;
#endif
    if (_MULTI_PARTITION && part) {
        /* Get partition information from partition table in the MBR */
        if (disk_read(pdrv, fs->win, 0, 1)) return FR_DISK_ERR;
        if (LD_WORD(fs->win+BS_55AA) != 0xAA55) return FR_MKFS_ABORTED;
        tbl = &fs->win[MBR_Table + (part - 1) * SZ_PTE];
        if (!tbl[4]) return FR_MKFS_ABORTED;    /* No partition? */
        b_vol = LD_DWORD(tbl+8);    /* Volume start sector */
        n_vol = LD_DWORD(tbl+12);   /* Volume size */
    } else {
        /* Create a partition in this function */
        if (disk_ioctl(pdrv, GET_SECTOR_COUNT, &n_vol) != RES_OK || n_vol < 128)
            return FR_DISK_ERR;
        b_vol = (sfd) ? 0 : 63;     /* Volume start sector */
        n_vol -= b_vol;             /* Volume size */
    }

    if (!au) {              /* AU auto selection */
        vs = n_vol / (2000 / (SS(fs) / 512));
        for (i = 0; vs < vst[i]; i++) ;
        au = cst[i];
    }
    au /= SS(fs);       /* Number of sectors per cluster */
    if (au == 0) au = 1;
    if (au > 128) au = 128;

    /* Pre-compute number of clusters and FAT sub-type */
    n_clst = n_vol / au;
    fmt = FS_FAT12;
    if (n_clst >= MIN_FAT16) fmt = FS_FAT16;
    if (n_clst >= MIN_FAT32) fmt = FS_FAT32;

    /* Determine offset and size of FAT structure */
    if (fmt == FS_FAT32) {
        n_fat = ((n_clst * 4) + 8 + SS(fs) - 1) / SS(fs);
        n_rsv = 32;
        n_dir = 0;
    } else {
        n_fat = (fmt == FS_FAT12) ? (n_clst * 3 + 1) / 2 + 3 : (n_clst * 2) + 4;
        n_fat = (n_fat + SS(fs) - 1) / SS(fs);
        n_rsv = 1;
        n_dir = (DWORD)N_ROOTDIR * SZ_DIR / SS(fs);
    }
    b_fat = b_vol + n_rsv;              /* FAT area start sector */
    b_dir = b_fat + n_fat * N_FATS;     /* Directory area start sector */
    b_data = b_dir + n_dir;             /* Data area start sector */
    if (n_vol < b_data + au - b_vol) return FR_MKFS_ABORTED;    /* Too small volume */

    /* Align data start sector to erase block boundary (for flash memory media) */
    if (disk_ioctl(pdrv, GET_BLOCK_SIZE, &n) != RES_OK || !n || n > 32768) n = 1;
    n = (b_data + n - 1) & ~(n - 1);    /* Next nearest erase block from current data start */
    n = (n - b_data) / N_FATS;
    if (fmt == FS_FAT32) {      /* FAT32: Move FAT offset */
        n_rsv += n;
        b_fat += n;
    } else {                    /* FAT12/16: Expand FAT size */
        n_fat += n;
    }

    /* Determine number of clusters and final check of validity of the FAT sub-type */
    n_clst = (n_vol - n_rsv - n_fat * N_FATS - n_dir) / au;
    if (   (fmt == FS_FAT16 && n_clst < MIN_FAT16)
        || (fmt == FS_FAT32 && n_clst < MIN_FAT32))
        return FR_MKFS_ABORTED;

    /* Determine system ID in the partition table */
    if (fmt == FS_FAT32) {
        sys = 0x0C;     /* FAT32X */
    } else {
        if (fmt == FS_FAT12 && n_vol < 0x10000) {
            sys = 0x01; /* FAT12(<65536) */
        } else {
            sys = (n_vol < 0x10000) ? 0x04 : 0x06;  /* FAT16(<65536) : FAT12/16(>=65536) */
        }
    }

    if (_MULTI_PARTITION && part) {
        /* Update system ID in the partition table */
        tbl = &fs->win[MBR_Table + (part - 1) * SZ_PTE];
        tbl[4] = sys;
        if (disk_write(pdrv, fs->win, 0, 1))    /* Write it to teh MBR */
            return FR_DISK_ERR;
        md = 0xF8;
    } else {
        if (sfd) {  /* No partition table (SFD) */
            md = 0xF0;
        } else {    /* Create partition table (FDISK) */
            mem_set(fs->win, 0, SS(fs));
            tbl = fs->win+MBR_Table;    /* Create partition table for single partition in the drive */
            tbl[1] = 1;                     /* Partition start head */
            tbl[2] = 1;                     /* Partition start sector */
            tbl[3] = 0;                     /* Partition start cylinder */
            tbl[4] = sys;                   /* System type */
            tbl[5] = 254;                   /* Partition end head */
            n = (b_vol + n_vol) / 63 / 255;
            tbl[6] = (BYTE)(n >> 2 | 63);   /* Partition end sector */
            tbl[7] = (BYTE)n;               /* End cylinder */
            ST_DWORD(tbl+8, 63);            /* Partition start in LBA */
            ST_DWORD(tbl+12, n_vol);        /* Partition size in LBA */
            ST_WORD(fs->win+BS_55AA, 0xAA55);   /* MBR signature */
            if (disk_write(pdrv, fs->win, 0, 1))    /* Write it to the MBR */
                return FR_DISK_ERR;
            md = 0xF8;
        }
    }

    /* Create BPB in the VBR */
    tbl = fs->win;                          /* Clear sector */
    mem_set(tbl, 0, SS(fs));
    mem_cpy(tbl, "\xEB\xFE\x90" "MSDOS5.0", 11);/* Boot jump code, OEM name */
    i = SS(fs);                             /* Sector size */
    ST_WORD(tbl+BPB_BytsPerSec, i);
    tbl[BPB_SecPerClus] = (BYTE)au;         /* Sectors per cluster */
    ST_WORD(tbl+BPB_RsvdSecCnt, n_rsv);     /* Reserved sectors */
    tbl[BPB_NumFATs] = N_FATS;              /* Number of FATs */
    i = (fmt == FS_FAT32) ? 0 : N_ROOTDIR;  /* Number of root directory entries */
    ST_WORD(tbl+BPB_RootEntCnt, i);
    if (n_vol < 0x10000) {                  /* Number of total sectors */
        ST_WORD(tbl+BPB_TotSec16, n_vol);
    } else {
        ST_DWORD(tbl+BPB_TotSec32, n_vol);
    }
    tbl[BPB_Media] = md;                    /* Media descriptor */
    ST_WORD(tbl+BPB_SecPerTrk, 63);         /* Number of sectors per track */
    ST_WORD(tbl+BPB_NumHeads, 255);         /* Number of heads */
    ST_DWORD(tbl+BPB_HiddSec, b_vol);       /* Hidden sectors */
    n = get_fattime();                      /* Use current time as VSN */
    if (fmt == FS_FAT32) {
        ST_DWORD(tbl+BS_VolID32, n);        /* VSN */
        ST_DWORD(tbl+BPB_FATSz32, n_fat);   /* Number of sectors per FAT */
        ST_DWORD(tbl+BPB_RootClus, 2);      /* Root directory start cluster (2) */
        ST_WORD(tbl+BPB_FSInfo, 1);         /* FSINFO record offset (VBR+1) */
        ST_WORD(tbl+BPB_BkBootSec, 6);      /* Backup boot record offset (VBR+6) */
        tbl[BS_DrvNum32] = 0x80;            /* Drive number */
        tbl[BS_BootSig32] = 0x29;           /* Extended boot signature */
        mem_cpy(tbl+BS_VolLab32, "NO NAME    " "FAT32   ", 19); /* Volume label, FAT signature */
    } else {
        ST_DWORD(tbl+BS_VolID, n);          /* VSN */
        ST_WORD(tbl+BPB_FATSz16, n_fat);    /* Number of sectors per FAT */
        tbl[BS_DrvNum] = 0x80;              /* Drive number */
        tbl[BS_BootSig] = 0x29;             /* Extended boot signature */
        mem_cpy(tbl+BS_VolLab, "NO NAME    " "FAT     ", 19);   /* Volume label, FAT signature */
    }
    ST_WORD(tbl+BS_55AA, 0xAA55);           /* Signature (Offset is fixed here regardless of sector size) */
    if (disk_write(pdrv, tbl, b_vol, 1))    /* Write it to the VBR sector */
        return FR_DISK_ERR;
    if (fmt == FS_FAT32)                    /* Write backup VBR if needed (VBR+6) */
        disk_write(pdrv, tbl, b_vol + 6, 1);

    /* Initialize FAT area */
    wsect = b_fat;
    for (i = 0; i < N_FATS; i++) {      /* Initialize each FAT copy */
        mem_set(tbl, 0, SS(fs));            /* 1st sector of the FAT  */
        n = md;                             /* Media descriptor byte */
        if (fmt != FS_FAT32) {
            n |= (fmt == FS_FAT12) ? 0x00FFFF00 : 0xFFFFFF00;
            ST_DWORD(tbl+0, n);             /* Reserve cluster #0-1 (FAT12/16) */
        } else {
            n |= 0xFFFFFF00;
            ST_DWORD(tbl+0, n);             /* Reserve cluster #0-1 (FAT32) */
            ST_DWORD(tbl+4, 0xFFFFFFFF);
            ST_DWORD(tbl+8, 0x0FFFFFFF);    /* Reserve cluster #2 for root directory */
        }
        if (disk_write(pdrv, tbl, wsect++, 1))
            return FR_DISK_ERR;
        mem_set(tbl, 0, SS(fs));            /* Fill following FAT entries with zero */
        for (n = 1; n < n_fat; n++) {       /* This loop may take a time on FAT32 volume due to many single sector writes */
            if (disk_write(pdrv, tbl, wsect++, 1))
                return FR_DISK_ERR;
        }
    }

    /* Initialize root directory */
    i = (fmt == FS_FAT32) ? au : n_dir;
    do {
        if (disk_write(pdrv, tbl, wsect++, 1))
            return FR_DISK_ERR;
    } while (--i);

#if _USE_ERASE  /* Erase data area if needed */
    {
        DWORD eb[2];

        eb[0] = wsect; eb[1] = wsect + (n_clst - ((fmt == FS_FAT32) ? 1 : 0)) * au - 1;
        disk_ioctl(pdrv, CTRL_ERASE_SECTOR, eb);
    }
#endif

    /* Create FSINFO if needed */
    if (fmt == FS_FAT32) {
        ST_DWORD(tbl+FSI_LeadSig, 0x41615252);
        ST_DWORD(tbl+FSI_StrucSig, 0x61417272);
        ST_DWORD(tbl+FSI_Free_Count, n_clst - 1);   /* Number of free clusters */
        ST_DWORD(tbl+FSI_Nxt_Free, 2);              /* Last allocated cluster# */
        ST_WORD(tbl+BS_55AA, 0xAA55);
        disk_write(pdrv, tbl, b_vol + 1, 1);    /* Write original (VBR+1) */
        disk_write(pdrv, tbl, b_vol + 7, 1);    /* Write backup (VBR+7) */
    }

    return (disk_ioctl(pdrv, CTRL_SYNC, 0) == RES_OK) ? FR_OK : FR_DISK_ERR;
}
#endif /* _USE_MKFS && !_FS_READONLY */

#if _USE_MKFS && !_FS_READONLY && _MULTI_PARTITION

FRESULT f_fdisk (
        BYTE pdrv,
        const DWORD szt[],
        void* work
)
{
    UINT i, n, sz_cyl, tot_cyl, b_cyl, e_cyl, p_cyl;
    BYTE s_hd, e_hd, *p, *buf = (BYTE*)work;
    DSTATUS stat;
    DWORD sz_disk, sz_part, s_part;


    stat = disk_initialize(pdrv);
    if (stat & STA_NOINIT) return FR_NOT_READY;
    if (stat & STA_PROTECT) return FR_WRITE_PROTECTED;
    if (disk_ioctl(pdrv, GET_SECTOR_COUNT, &sz_disk)) return FR_DISK_ERR;

    /* Determine CHS in the table regardless of the drive geometry */
    for (n = 16; n < 256 && sz_disk / n / 63 > 1024; n *= 2) ;
    if (n == 256) n--;
    e_hd = n - 1;
    sz_cyl = 63 * n;
    tot_cyl = sz_disk / sz_cyl;

    /* Create partition table */
    mem_set(buf, 0, _MAX_SS);
    p = buf + MBR_Table; b_cyl = 0;
    for (i = 0; i < 4; i++, p += SZ_PTE) {
        p_cyl = (szt[i] <= 100U) ? (DWORD)tot_cyl * szt[i] / 100 : szt[i] / sz_cyl;
        if (!p_cyl) continue;
        s_part = (DWORD)sz_cyl * b_cyl;
        sz_part = (DWORD)sz_cyl * p_cyl;
        if (i == 0) {   /* Exclude first track of cylinder 0 */
            s_hd = 1;
            s_part += 63; sz_part -= 63;
        } else {
            s_hd = 0;
        }
        e_cyl = b_cyl + p_cyl - 1;
        if (e_cyl >= tot_cyl) return FR_INVALID_PARAMETER;

        /* Set partition table */
        p[1] = s_hd;                        /* Start head */
        p[2] = (BYTE)((b_cyl >> 2) + 1);    /* Start sector */
        p[3] = (BYTE)b_cyl;                 /* Start cylinder */
        p[4] = 0x06;                        /* System type (temporary setting) */
        p[5] = e_hd;                        /* End head */
        p[6] = (BYTE)((e_cyl >> 2) + 63);   /* End sector */
        p[7] = (BYTE)e_cyl;                 /* End cylinder */
        ST_DWORD(p + 8, s_part);            /* Start sector in LBA */
        ST_DWORD(p + 12, sz_part);          /* Partition size */

        /* Next partition */
        b_cyl += p_cyl;
    }
    ST_WORD(p, 0xAA55);

    /* Write it to the MBR */
    return (disk_write(pdrv, buf, 0, 1) || disk_ioctl(pdrv, CTRL_SYNC, 0)) ? FR_DISK_ERR : FR_OK;
}
#endif /* _USE_MKFS && !_FS_READONLY && _MULTI_PARTITION */

#if _USE_STRFUNC

TCHAR* f_gets(TCHAR* buff, int len, FIL* fp) {
    int n = 0;
    TCHAR c, *p = buff;
    BYTE s[2];
    UINT rc;


    while (n < len - 1) {   /* Read characters until buffer gets filled */
#if _LFN_UNICODE
#if _STRF_ENCODE == 3       /* Read a character in UTF-8 */
        f_read(fp, s, 1, &rc);
        if (rc != 1) break;
        c = s[0];
        if (c >= 0x80) {
            if (c < 0xC0) continue; /* Skip stray trailer */
            if (c < 0xE0) {         /* Two-byte sequence */
                f_read(fp, s, 1, &rc);
                if (rc != 1) break;
                c = (c & 0x1F) << 6 | (s[0] & 0x3F);
                if (c < 0x80) c = '?';
            } else {
                if (c < 0xF0) {     /* Three-byte sequence */
                    f_read(fp, s, 2, &rc);
                    if (rc != 2) break;
                    c = c << 12 | (s[0] & 0x3F) << 6 | (s[1] & 0x3F);
                    if (c < 0x800) c = '?';
                } else {            /* Reject four-byte sequence */
                    c = '?';
                }
            }
        }
#elif _STRF_ENCODE == 2     /* Read a character in UTF-16BE */
        f_read(fp, s, 2, &rc);
        if (rc != 2) break;
        c = s[1] + (s[0] << 8);
#elif _STRF_ENCODE == 1     /* Read a character in UTF-16LE */
        f_read(fp, s, 2, &rc);
        if (rc != 2) break;
        c = s[0] + (s[1] << 8);
#else                       /* Read a character in ANSI/OEM */
        f_read(fp, s, 1, &rc);
        if (rc != 1) break;
        c = s[0];
        if (IsDBCS1(c)) {
            f_read(fp, s, 1, &rc);
            if (rc != 1) break;
            c = (c << 8) + s[0];
        }
        c = ff_convert(c, 1);   /* OEM -> Unicode */
        if (!c) c = '?';
#endif
#else                       /* Read a character without conversion */
        f_read(fp, s, 1, &rc);
        if (rc != 1) break;
        c = s[0];
#endif
        if (_USE_STRFUNC == 2 && c == '\r') continue;   /* Strip '\r' */
        *p++ = c;
        n++;
        if (c == '\n') break;       /* Break on EOL */
    }
    *p = 0;
    return n ? buff : 0;            /* When no data read (eof or error), return with error. */
}
#endif /* _USE_STRFUNC */

#if _USE_STRFUNC && !_FS_READONLY
#include <stdarg.h>
#endif /* _USE_STRFUNC && !_FS_READONLY */

#if _USE_STRFUNC && !_FS_READONLY

typedef struct {
    FIL* fp; 
    int idx;
    int nchr;
    BYTE buf[64];
} putbuff;
#endif /* _USE_STRFUNC && !_FS_READONLY */

#if _USE_STRFUNC && !_FS_READONLY

static void putc_bfd(putbuff* pb, TCHAR c) {
    UINT bw;
    int i;


    if (_USE_STRFUNC == 2 && c == '\n')  /* LF -> CRLF conversion */
        putc_bfd(pb, '\r');

    i = pb->idx;    /* Buffer write index (-1:error) */
    if (i < 0) return;

#if _LFN_UNICODE
#if _STRF_ENCODE == 3           /* Write a character in UTF-8 */
    if (c < 0x80) {             /* 7-bit */
        pb->buf[i++] = (BYTE)c;
    } else {
        if (c < 0x800) {        /* 11-bit */
            pb->buf[i++] = (BYTE)(0xC0 | c >> 6);
        } else {                /* 16-bit */
            pb->buf[i++] = (BYTE)(0xE0 | c >> 12);
            pb->buf[i++] = (BYTE)(0x80 | (c >> 6 & 0x3F));
        }
        pb->buf[i++] = (BYTE)(0x80 | (c & 0x3F));
    }
#elif _STRF_ENCODE == 2         /* Write a character in UTF-16BE */
    pb->buf[i++] = (BYTE)(c >> 8);
    pb->buf[i++] = (BYTE)c;
#elif _STRF_ENCODE == 1         /* Write a character in UTF-16LE */
    pb->buf[i++] = (BYTE)c;
    pb->buf[i++] = (BYTE)(c >> 8);
#else                           /* Write a character in ANSI/OEM */
    c = ff_convert(c, 0);   /* Unicode -> OEM */
    if (!c) c = '?';
    if (c >= 0x100)
        pb->buf[i++] = (BYTE)(c >> 8);
    pb->buf[i++] = (BYTE)c;
#endif
#else                           /* Write a character without conversion */
    pb->buf[i++] = (BYTE)c;
#endif

    if (i >= (int)(sizeof pb->buf) - 3) {   /* Write buffered characters to the file */
        f_write(pb->fp, pb->buf, (UINT)i, &bw);
        i = (bw == (UINT)i) ? 0 : -1;
    }
    pb->idx = i;
    pb->nchr++;
}
#endif /* _USE_STRFUNC && !_FS_READONLY */

#if _USE_STRFUNC && !_FS_READONLY

int f_putc(TCHAR c, FIL* fp) {
    putbuff pb;
    UINT nw;


    pb.fp = fp;         /* Initialize output buffer */
    pb.nchr = pb.idx = 0;

    putc_bfd(&pb, c);   /* Put a character */

    if (   pb.idx >= 0  /* Flush buffered characters to the file */
        && f_write(pb.fp, pb.buf, (UINT)pb.idx, &nw) == FR_OK
        && (UINT)pb.idx == nw) return pb.nchr;
    return EOF;
}
#endif /* _USE_STRFUNC && !_FS_READONLY */

#if _USE_STRFUNC && !_FS_READONLY

int f_puts(const TCHAR* str, FIL* fp) {
    putbuff pb;
    UINT nw;


    pb.fp = fp;             /* Initialize output buffer */
    pb.nchr = pb.idx = 0;

    while (*str)            /* Put the string */
        putc_bfd(&pb, *str++);

    if (   pb.idx >= 0      /* Flush buffered characters to the file */
        && f_write(pb.fp, pb.buf, (UINT)pb.idx, &nw) == FR_OK
        && (UINT)pb.idx == nw) return pb.nchr;
    return EOF;
}
#endif /* _USE_STRFUNC && !_FS_READONLY */

#if _USE_STRFUNC && !_FS_READONLY

int f_printf(FIL* fp, const TCHAR* fmt, ...) {
    va_list arp;
    BYTE f, r;
    UINT nw, i, j, w;
    DWORD v;
    TCHAR c, d, s[16], *p;
    putbuff pb;


    pb.fp = fp;             /* Initialize output buffer */
    pb.nchr = pb.idx = 0;

    va_start(arp, fmt);

    for (;;) {
        c = *fmt++;
        if (c == 0) break;          /* End of string */
        if (c != '%') {             /* Non escape character */
            putc_bfd(&pb, c);
            continue;
        }
        w = f = 0;
        c = *fmt++;
        if (c == '0') {             /* Flag: '0' padding */
            f = 1; c = *fmt++;
        } else {
            if (c == '-') {         /* Flag: left justified */
                f = 2; c = *fmt++;
            }
        }
        while (IsDigit(c)) {        /* Precision */
            w = w * 10 + c - '0';
            c = *fmt++;
        }
        if (c == 'l' || c == 'L') { /* Prefix: Size is long int */
            f |= 4; c = *fmt++;
        }
        if (!c) break;
        d = c;
        if (IsLower(d)) d -= 0x20;
        switch (d) {                /* Type is... */
        case 'S' :                  /* String */
            p = va_arg(arp, TCHAR*);
            for (j = 0; p[j]; j++) ;
            if (!(f & 2)) {
                while (j++ < w) putc_bfd(&pb, ' ');
            }
            while (*p) putc_bfd(&pb, *p++);
            while (j++ < w) putc_bfd(&pb, ' ');
            continue;
        case 'C' :                  /* Character */
            putc_bfd(&pb, (TCHAR)va_arg(arp, int)); continue;
        case 'B' :                  /* Binary */
            r = 2; break;
        case 'O' :                  /* Octal */
            r = 8; break;
        case 'D' :                  /* Signed decimal */
        case 'U' :                  /* Unsigned decimal */
            r = 10; break;
        case 'X' :                  /* Hexdecimal */
            r = 16; break;
        default:                    /* Unknown type (pass-through) */
            putc_bfd(&pb, c); continue;
        }

        /* Get an argument and put it in numeral */
        v = (f & 4) ? (DWORD)va_arg(arp, long) : ((d == 'D') ? (DWORD)(long)va_arg(arp, int) : (DWORD)va_arg(arp, unsigned int));
        if (d == 'D' && (v & 0x80000000)) {
            v = 0 - v;
            f |= 8;
        }
        i = 0;
        do {
            d = (TCHAR)(v % r); v /= r;
            if (d > 9) d += (c == 'x') ? 0x27 : 0x07;
            s[i++] = d + '0';
        } while (v && i < sizeof s / sizeof s[0]);
        if (f & 8) s[i++] = '-';
        j = i; d = (f & 1) ? '0' : ' ';
        while (!(f & 2) && j++ < w) putc_bfd(&pb, d);
        do putc_bfd(&pb, s[--i]); while (i);
        while (j++ < w) putc_bfd(&pb, d);
    }

    va_end(arp);

    if (   pb.idx >= 0      /* Flush buffered characters to the file */
        && f_write(pb.fp, pb.buf, (UINT)pb.idx, &nw) == FR_OK
        && (UINT)pb.idx == nw) return pb.nchr;
    return EOF;
}
#endif /* _USE_STRFUNC && !_FS_READONLY */

#ifdef __cplusplus
}
#endif /* __cplusplus */