>> Is it worth to add all these additional files for the single >> operation of binary copy of a file with mod/acl preserving >> (which can be implemented with a few lines, even with >> error detection)? > > If it is easy, then propose a patch. :-)
That was my intention, but I wanted to have external opinion before spending time on it. The attached patch implements the low-level file copy mechanism (with permissions and times preserving). If this is OK, then it's possible to implement copyfile/movefile based on it.
Note: the attached patch also includes minor fixes concerning dir separation char definition and detection.
oct-fcopy.diff