Returns the current location associated with a specified
    directory stream. Performs operations on directories.

    Format

      #include  <dirent.h>

      long int telldir  (DIR *dir_pointer);

1 - Argument

 dir_pointer

    A pointer to the DIR structure of an open directory.

2 - Description

    The telldir function returns the current location associated with
    the specified directory stream.

3 - Return Values

    x                  The current location.
    -1                 Indicates an error and is further specified in
                       the global errno.