Hi

Does `let s = input_line ic` always increment `pos_in ic` by 
`String.length s + 1` ?

So, if I define a function

let undo_input_line ic s = 
seek_in ic (pos_in ic - String.length s - 1);;

will it always work as expected, or will this depend on I/O mode (binary vs 
text) and file format (DOS vs UNIX)?

Thanks
Oleg
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