question: public final int readLine ( char [ ] buf , int length , boolean isChop ) throws IOException { byte [ ] readBuffer = _readBuffer ; int offset = 0 ; while ( true ) { int readOffset = _readOffset ; int sublen = Math . min ( length , _readLength - readOffset ) ; for ( ; sublen > 0 ; sublen -- ) { int ch = readBuffer [ readOffset ++ ] & 0xff ; if ( ch != '\n' ) { } else if ( isChop ) { _readOffset = readOffset ; if ( offset > 0 && buf [ offset - 1 ] == '\r' ) return offset - 1 ; else return offset ; } else { buf [ offset ++ ] = ( char ) ch ; _readOffset = readOffset ; return offset + 1 ; } buf [ offset ++ ] = ( char ) ch ; } _readOffset = readOffset ; if ( readOffset <= _readLength ) { if ( ! readBuffer ( ) ) { return offset ; } } if ( length <= offset ) return length + 1 ; } }
target:  Reads a line into the character buffer.  \r\n is converted to \n.