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BufRead's read_line may be a problem when you need performance and safety on unvetted streams:

You may wait forever or get an out of memory panic if there's no newline in the stream. And even if there's one, it may be way past what you need: you'll have to keep everything in memory just to get to the start of the following line.

CharReader is a buffered reader fixing those problems.

It's suitable when you'd like to read UTF8 lines and aren't sure the data are kind enough.

When reading a line, you pass two parameters:

All errors are io::Error:

Alternative: If you know in advance how many lines you'd need and you always want whole lines, the standard take method of BufReader protects you against memory overflows.