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.
If the stream is open in binary mode, the value obtained by this function is the number of bytes from the beginning of the file.
If the stream is open in text mode, the value returned by this function is unspecified and is only meaningful as the input to fseek().
Parameters
| stream | - | file stream to examine |
Return value
File position indicator on success or EOF if failure occurs.
On error, the errno variable is set to implementation-defined positive value.