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2 - 1 
/*
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 * dofmt -- format to a buffer
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 * the number of characters formatted is returned,
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 * or -1 if there was an error.
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 * if the buffer is ever filled, flush is called.
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 * it should reset the buffer and return whether formatting should continue.
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 */
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typedef int (*Fmts)(Fmt*);
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typedef struct Quoteinfo Quoteinfo;
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struct Quoteinfo
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{
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	int	quoted;		/* if set, string must be quoted */
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	int	nrunesin;	/* number of input runes that can be accepted */
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	int	nbytesin;	/* number of input bytes that can be accepted */
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	int	nrunesout;	/* number of runes that will be generated */
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	int	nbytesout;	/* number of bytes that will be generated */
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};
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void	*_fmtflush(Fmt*, void*, int);
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void	*_fmtdispatch(Fmt*, void*, int);
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int	_floatfmt(Fmt*, double);
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int	_fmtpad(Fmt*, int);
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int	_rfmtpad(Fmt*, int);
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int	_fmtFdFlush(Fmt*);
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int	_efgfmt(Fmt*);
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int	_charfmt(Fmt*);
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int	_countfmt(Fmt*);
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int	_flagfmt(Fmt*);
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int	_percentfmt(Fmt*);
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int	_ifmt(Fmt*);
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int	_runefmt(Fmt*);
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int	_runesfmt(Fmt*);
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int	_strfmt(Fmt*);
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int	_badfmt(Fmt*);
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int	_fmtcpy(Fmt*, void*, int, int);
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int	_fmtrcpy(Fmt*, void*, int n);
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void	_fmtlock(void);
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void	_fmtunlock(void);
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#define FMTCHAR(f, t, s, c)\
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	do{\
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	if(t + 1 > (char*)s){\
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		t = _fmtflush(f, t, 1);\
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		if(t != nil)\
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			s = f->stop;\
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		else\
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			return -1;\
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	}\
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	*t++ = c;\
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	}while(0)
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#define FMTRCHAR(f, t, s, c)\
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	do{\
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	if(t + 1 > (Rune*)s){\
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		t = _fmtflush(f, t, sizeof(Rune));\
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		if(t != nil)\
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			s = f->stop;\
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		else\
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			return -1;\
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	}\
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	*t++ = c;\
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	}while(0)
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#define FMTRUNE(f, t, s, r)\
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	do{\
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	Rune _rune;\
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	int _runelen;\
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	if(t + UTFmax > (char*)s && t + (_runelen = runelen(r)) > (char*)s){\
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		t = _fmtflush(f, t, _runelen);\
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		if(t != nil)\
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			s = f->stop;\
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		else\
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			return -1;\
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	}\
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	if(r < Runeself)\
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		*t++ = r;\
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	else{\
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		_rune = r;\
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		t += runetochar(t, &_rune);\
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	}\
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	}while(0)