An API closer to ANSI C for the drivers

[bruno-at-orange]

Description

The fread method behaves differently from C ANSI, which does not return -1 and requires to use ferror:

• fread: https://en.cppreference.com/w/c/io/fread
• fwrite: https://en.cppreference.com/w/c/io/fwrite

It would be better to have the same behavior as C ANSI. To implement this, the driver API needs to be modified. We can start with the null driver in order to detect potential problems and after this step, we can specify the new driver API.