ftell
From cppreference.com
                    
                                        
                    
                    
                                                            
                    | Defined in header <stdio.h>
  | ||
| long ftell( FILE *stream ); | ||
Returns the file position indicator for the file stream stream.
[edit] Parameters
| stream | - | file stream to examine | 
[edit] Return value
file position indicator on success or EOF if failure occurs.
[edit] See also
| gets the file position indicator (function) | |
| moves the file position indicator to a specific location in a file (function) | |
| moves the file position indicator to a specific location in a file (function) | |