* Makefile.in (DLL_OFILES): Add fhandler_disk_file.o.

* cygheap.h (cygheap_fdnew::operator =): New operator.
* dir.cc: Add invalid struct checking throughout.  Use methods for all
directory manipulation throughout.
* fhandler.cc: Move fhandler_disk_file stuff to own file.
(fhandler_base::opendir): New method.
(fhandler_base::readdir): New method.
(fhandler_base::telldir): New method.
(fhandler_base::seekdir): New method.
(fhandler_base::rewinddir): New method.
(fhandler_base::closedir): New method.
* fhandler_disk_file.cc: New file.
* fhandler.h (fhandler_base): Declare new virtual methods.
(fhandler_disk_file): Ditto.
(fhandler_cygdrive): New class.
* path.cc (conv_path_list): Use strccpy to break apart path.

winsup/cygwin/cygheap.h

@@ -231,6 +231,7 @@ class cygheap_fdnew : public cygheap_fdmanip
 	locked = false;
       }
   }
+  void operator = (fhandler_base *fh) {*this->fh = fh;}
 };
 
 class cygheap_fdget : public cygheap_fdmanip