#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;}
#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;
}