+ struct stat source_dir_stats;
+ struct stat dest_dir_stats;
+ char *source_dirname, *dest_dirname;
+
+ /* Compare the parent directories (via the device and inode numbers). */
+ source_dirname = dir_name (source);
+ dest_dirname = dir_name (dest);
+
+ if (stat (source_dirname, &source_dir_stats))
+ {
+ /* Shouldn't happen. */
+ error (1, errno, "%s", source_dirname);
+ }
+
+ if (stat (dest_dirname, &dest_dir_stats))
+ {
+ /* Shouldn't happen. */
+ error (1, errno, "%s", dest_dirname);
+ }
+
+ same = SAME_INODE (source_dir_stats, dest_dir_stats);
+
+#if ! _POSIX_NO_TRUNC && HAVE_PATHCONF && defined _PC_NAME_MAX
+ if (same && ! identical_basenames)
+ {
+ long name_max = (errno = 0, pathconf (dest_dirname, _PC_NAME_MAX));
+ if (name_max < 0)
+ {
+ if (errno)
+ {
+ /* Shouldn't happen. */
+ error (1, errno, "%s", dest_dirname);
+ }
+ same = false;
+ }
+ else
+ same = (name_max <= min_baselen
+ && memcmp (source_basename, dest_basename, name_max) == 0);
+ }
+#endif