gdbstub-client.rb

require "socket"

HOST = "localhost"
PORT = 55555

def main
  sock = TCPSocket.open(HOST, PORT)
  sock.write("+")
  sock.write(make_msg("g"))
  while (str = read_msg(sock)) != "+"
  end
  p read_msg(sock)
  sock.write("+")
  sock.close
end

def sum(str)
  str.bytes.inject(0, :+) % 256
end

def make_msg(str)
  "$" + str + "#" + sum(str).to_s(16)
end

def read_msg(sock)
  c = sock.getc
  if c == "$"
    str = ""
    while (c = sock.getc) != "#"
      str << c
    end
    # checksum のチェックは省略
    sock.getc
    sock.getc
    ret = str
  else
    ret = c
  end
end

main() if $0 == __FILE__