ftell
From cppreference.com
                    
                                        
                    
                    
                                                            
                    |   Defined in header <stdio.h>
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|   long ftell( FILE *stream );  | 
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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)  | |
|   C++ documentation for ftell 
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