Why istream::getline() returns so many times (with nothing)?

If you're using space as a delimiter anytime it's encountered getline will return with whatever there was upto the delimiter. If the file had 5 spaces in a row before any other characters for example you'd now have to call getline 6 times.

Bi-directional I/O with std::stringstream is really ambiguous. I recommand that you use it a little differently.

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