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#include <u.h>
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#include <libc.h>
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#include "fmtdef.h"
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/* format the output into f->to and return the number of characters fmted  */
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int
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dorfmt(Fmt *f, Rune *fmt)
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{
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	Rune *rt, *rs;
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	int r;
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	char *t, *s;
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	int nfmt;
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	nfmt = f->nfmt;
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	for(;;){
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		if(f->runes){
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			rt = f->to;
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			rs = f->stop;
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			while((r = *fmt++) && r != '%'){
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				FMTRCHAR(f, rt, rs, r);
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			}
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			f->nfmt += rt - (Rune *)f->to;
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			f->to = rt;
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			if(!r)
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				return f->nfmt - nfmt;
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			f->stop = rs;
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		}else{
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			t = f->to;
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			s = f->stop;
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			while((r = *fmt++) && r != '%'){
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				FMTRUNE(f, t, f->stop, r);
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			}
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			f->nfmt += t - (char *)f->to;
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			f->to = t;
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			if(!r)
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				return f->nfmt - nfmt;
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			f->stop = s;
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		}
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		fmt = _fmtdispatch(f, fmt, 1);
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		if(fmt == nil)
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			return -1;
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	}
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}