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#include <u.h>
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#include <libc.h>
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#include <fcall.h>
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enum
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{
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	DIRSIZE	= STATFIXLEN + 16 * 4		/* enough for encoded stat buf + some reasonable strings */
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};
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Dir*
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dirstat(char *name)
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{
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	Dir *d;
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	uchar *buf;
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	int n, nd, i;
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	nd = DIRSIZE;
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	for(i=0; i<2; i++){	/* should work by the second try */
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		d = malloc(sizeof(Dir) + BIT16SZ + nd);
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		if(d == nil)
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			return nil;
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		buf = (uchar*)&d[1];
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		n = stat(name, buf, BIT16SZ+nd);
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		if(n < BIT16SZ){
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			free(d);
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			return nil;
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		}
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		nd = GBIT16((uchar*)buf);	/* upper bound on size of Dir + strings */
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		if(nd <= n){
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			convM2D(buf, n, d, (char*)&d[1]);
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			return d;
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		}
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		/* else sizeof(Dir)+BIT16SZ+nd is plenty */
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		free(d);
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	}
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	return nil;
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}