Dir*
_dirfstat(int fd)
{
Dir *d;
uint8_t *buf;
int n, nd, i;
nd = DIRSIZE;
for(i=0; i<2; i++){ /* should work by the second try */
d = malloc(sizeof(Dir) + nd);
if(d == nil)
return nil;
buf = (uint8_t*)&d[1];
n = _FSTAT(fd, buf, nd);
if(n < BIT16SZ){
free(d);
return nil;
}
nd = GBIT16(buf); /* size needed to store whole stat buffer */
if(nd <= n){
_convM2D(buf, n, d, (char*)&d[1]);
return d;
}
/* else sizeof(Dir)+nd is plenty */
free(d);
}
return nil;
}
static
long
dirpackage(uchar *buf, long ts, Dir **d)
{
char *s;
long ss, i, n, nn, m;
if(ts == 0){
*d = nil;
return 0;
}
/*
* first find number of all stats, check they look like stats, & size all associated strings
*/
ss = 0;
n = 0;
for(i = 0; i < ts; i += m){
m = BIT16SZ + GBIT16(&buf[i]);
if(statcheck(&buf[i], m) < 0)
break;
ss += m;
n++;
}
if(i != ts)
return -1;
*d = malloc(n * sizeof(Dir) + ss);
if(*d == nil)
return -1;
/*
* then convert all buffers
*/
s = (char*)*d + n * sizeof(Dir);
nn = 0;
for(i = 0; i < ts; i += m){
m = BIT16SZ + GBIT16((uchar*)&buf[i]);
if(nn >= n || _convM2D(&buf[i], m, *d + nn, s) != m){
free(*d);
return -1;
}
nn++;
s += m;
}
return nn;
}
