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#include "lib.h"
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#include <string.h>
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#include <stdlib.h>
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#include "sys9.h"
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#include "dir.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);	/* size needed to store whole stat buffer */
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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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}
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int
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_dirwstat(char *name, Dir *d)
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{
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	uchar *buf;
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	int r;
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	r = _sizeD2M(d);
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	buf = malloc(r);
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	if(buf == nil)
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		return -1;
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	_convD2M(d, buf, r);
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	r = _WSTAT(name, buf, r);
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	free(buf);
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	return r;
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}
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Dir*
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_dirfstat(int fd)
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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) + 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 = _FSTAT(fd, buf, 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(buf);	/* size needed to store whole stat buffer */
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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)+nd is plenty */
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		free(d);
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	}
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	return nil;
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}
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int
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_dirfwstat(int fd, Dir *d)
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{
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	uchar *buf;
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	int r;
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	r = _sizeD2M(d);
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	buf = malloc(r);
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	if(buf == nil)
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		return -1;
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	_convD2M(d, buf, r);
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	r = _FWSTAT(fd, buf, r);
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	free(buf);
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	return r;
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}
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void
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_nulldir(Dir *d)
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{
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	memset(d, ~0, sizeof(Dir));
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	d->name = d->uid = d->gid = d->muid = "";
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}