/*  * This file is part of the UCB release of Plan 9. It is subject to the license * terms in the LICENSE file found in the top-level directory of this * distribution and at http://akaros.cs.berkeley.edu/files/Plan9License. No * part of the UCB release of Plan 9, including this file, may be copied, * modified, propagated, or distributed except according to the terms contained * in the LICENSE file. */ #include <u.h>#include <libc.h>#include <fcall.h> enum{	DIRSIZE	= STATFIXLEN + 16 * 4		/* enough for encoded stat buf + some reasonable strings */}; Dir*dirfstat(int fd){	Dir *d;	uchar *buf;	int n, nd, i; 	nd = DIRSIZE;	for(i=0; i<2; i++){	/* should work by the second try */		d = malloc(sizeof(Dir) + BIT16SZ + nd);		if(d == nil)			return nil;		buf = (uchar*)&d[1];		n = fstat(fd, buf, BIT16SZ+nd);		if(n < BIT16SZ){			free(d);			return nil;		}		nd = GBIT16(buf);	/* upper bound on size of Dir + strings */		if(nd <= n){			convM2D(buf, n, d, (char*)&d[1]);			return d;		}		/* else sizeof(Dir)+BIT16SZ+nd is plenty */		free(d);	}	return nil;}