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#include	<u.h>
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#include	<libc.h>
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#include	<bio.h>
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static int
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fmtBflush(Fmt *f)
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{
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	Biobufhdr *bp;
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	bp = f->farg;
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	bp->ocount = (char*)f->to - (char*)f->stop;
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	if(Bflush(bp) < 0)
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		return 0;
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	f->stop = bp->ebuf;
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	f->to = (char*)f->stop + bp->ocount;
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	f->start = f->to;
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	return 1;
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}
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int
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Bvprint(Biobufhdr *bp, char *fmt, va_list arg)
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{
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	int n;
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	Fmt f;
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	f.runes = 0;
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	f.stop = bp->ebuf;
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	f.start = (char*)f.stop + bp->ocount;
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	f.to = f.start;
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	f.flush = fmtBflush;
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	f.farg = bp;
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	f.nfmt = 0;
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	f.args = arg;
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	n = dofmt(&f, fmt);
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	bp->ocount = (char*)f.to - (char*)f.stop;
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	return n;
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}