Make 'fstat' on MS-Windows behave more like 'stat' and 'lstat'.

 src/w32.c (fstat): Return owner and group like 'stat' and 'lstat' do.

src/ChangeLog

@@ -3,6 +3,7 @@
 	* w32.c (acl_set_file): Treat ERROR_ACCESS_DENIED from
 	set_file_security as failure due to insufficient privileges.
 	Reported by Fabrice Popineau <fabrice.popineau@supelec.fr>.
+	(fstat): Return owner and group like 'stat' and 'lstat' do.
 2013-01-19  Paul Eggert  <eggert@cs.ucla.edu>

src/w32.c

@@ -4164,13 +4164,23 @@ fstat (int desc, struct stat * buf)
   else
     buf->st_ino = fake_inode;
 
-  /* Consider files to belong to current user.
-     FIXME: this should use GetSecurityInfo API, but it is only
-     available for _WIN32_WINNT >= 0x501.  */
-  buf->st_uid = dflt_passwd.pw_uid;
-  buf->st_gid = dflt_passwd.pw_gid;
-  strcpy (buf->st_uname, dflt_passwd.pw_name);
-  strcpy (buf->st_gname, dflt_group.gr_name);
+  /* If the caller so requested, get the true file owner and group.
+     Otherwise, consider the file to belong to the current user.  */
+  if (!w32_stat_get_owner_group || is_windows_9x () == TRUE)
+    get_file_owner_and_group (NULL, buf);
+  else
+    {
+      PSECURITY_DESCRIPTOR psd = NULL;
+
+      psd = get_file_security_desc_by_handle (fh);
+      if (psd)
+	{
+	  get_file_owner_and_group (psd, buf);
+	  LocalFree (psd);
+	}
+      else
+	get_file_owner_and_group (NULL, buf);
+    }
 
   buf->st_dev = info.dwVolumeSerialNumber;
   buf->st_rdev = info.dwVolumeSerialNumber;