#define JISX0201_R_ENCODE(c, assi)			\
	if ((c) < 0x80 && (c) != 0x5c && (c) != 0x7e)	\
		(assi) = (c);				\
	else if ((c) == 0x00a5) (assi) = 0x5c;		\
	else if ((c) == 0x203e) (assi) = 0x7e;
#define JISX0201_K_ENCODE(c, assi)			\
	if ((c) >= 0xff61 && (c) <= 0xff9f)		\
		(assi) = (c) - 0xfec0;
#define JISX0201_ENCODE(c, assi)			\
	JISX0201_R_ENCODE(c, assi)			\
	else JISX0201_K_ENCODE(c, assi)

#define JISX0201_R_DECODE(c, assi)			\
	if ((c) < 0x5c) (assi) = (c);			\
	else if ((c) == 0x5c) (assi) = 0x00a5;		\
	else if ((c) < 0x7e) (assi) = (c);		\
	else if ((c) == 0x7e) (assi) = 0x203e;		\
	else if ((c) == 0x7f) (assi) = 0x7f;
#define JISX0201_K_DECODE(c, assi)			\
	if ((c) >= 0xa1 && (c) <= 0xdf)			\
	(assi) = 0xfec0 + (c);
#define JISX0201_DECODE(c, assi)			\
	JISX0201_R_DECODE(c, assi)			\
	else JISX0201_K_DECODE(c, assi)