the bufreader for reading file io , reads one line at a time ? , or whatever comes in its 4kb buffer and
what happens if a line is bigger than 4kb
BufReader reads in raw bytes, it's not text line oriented on its own. Its purpose is to avoid a slew of read syscalls if you're "sipping" from the underlying (unbuffered) I/O source (e.g. reading just a few bytes at a time). To get text lines out of it, you'd use the Lines iterator, which sits on top of the BufReader and gives it a String to read into (so another buffer on top, if you will): mod.rs - source
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