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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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struct	bgetd
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{
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	Biobufhdr*	b;
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	int		eof;
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};
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static int
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Bgetdf(void *vp)
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{
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	int c;
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	struct bgetd *bg = vp;
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	c = Bgetc(bg->b);
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	if(c == Beof)
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		bg->eof = 1;
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	return c;
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}
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int
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Bgetd(Biobufhdr *bp, double *dp)
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{
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	double d;
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	struct bgetd b;
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	b.b = bp;
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	b.eof = 0;
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	d = charstod(Bgetdf, &b);
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	if(b.eof)
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		return -1;
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	Bungetc(bp);
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	*dp = d;
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	return 1;
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}