readpartial is designed for streams such as pipes, sockets, and ttys. It
blocks only when no data is immediately available. This means that it
blocks only when following all conditions hold:
The byte buffer in the IO object is empty. The content of the stream is empty. The stream has not reached EOF.
When readpartial blocks, it waits for data or EOF. If some data is
read, readpartial returns with the data.If EOF is reached,
readpartial raises an EOFError.
When readpartial doesn’t block, it returns or raises immediately. If
the byte buffer is not empty, it returns the data in the
buffer.Otherwise, if the stream has some content, it returns the
data in the stream.If the stream reaches EOF an EOFError is
Could anyone help me to understand how ARGF#readpartial is coded for
each of the above ** marked lines?