rb_scan_args

# File lib/rdoc/parser/c.rb, line 1116
  def rb_scan_args method_body
    method_body =~ /rb_scan_args\((.*?)\)/
    return '(*args)' unless $1

    $1.split(/,/)[2] =~ /"(.*?)"/ # format argument
    format = $1.split(//)

    lead = opt = trail = 0

    if format.first =~ /\d/ then
      lead = $&.to_i
      format.shift
      if format.first =~ /\d/ then
        opt = $&.to_i
        format.shift
        if format.first =~ /\d/ then
          trail = $&.to_i
          format.shift
          block_arg = true
        end
      end
    end

    if format.first == '*' and not block_arg then
      var = true
      format.shift
      if format.first =~ /\d/ then
        trail = $&.to_i
        format.shift
      end
    end

    if format.first == ':' then
      hash = true
      format.shift
    end

    if format.first == '&' then
      block = true
      format.shift
    end

    # if the format string is not empty there's a bug in the C code, ignore it

    args = []
    position = 1

    (1...(position + lead)).each do |index|
      args << "p#{index}"
    end

    position += lead

    (position...(position + opt)).each do |index|
      args << "p#{index} = v#{index}"
    end

    position += opt

    if var then
      args << '*args'
      position += 1
    end

    (position...(position + trail)).each do |index|
      args << "p#{index}"
    end

    position += trail

    if hash then
      args << "p#{position} = {}"
      position += 1
    end

    args << '&block' if block

    "(#{args.join ', '})"
  end