wiki:Developer/Projects/Open/LineEditor

SimpleLineEditor?

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Contact: Sebastian Huber

The RTEMS Shell and Monitor both have a simple line editor. They use a very similar implementation. One may refactor this into a common implementation which is usable in a general environment.

There are 3 parts:

  • The key definitions moved to rtems-lineeditor.h
  • The line editor function, i.e. rtems_shell_line_editor
  • The terminal parser, i.e. rtems_shell_getchar

Some notes: The shell interface and code is better than the monitor. The shell uses FILE handles and this is nice for redirection and multi-user usage (a threaded version). It also supports a command history. The caller should provide the terminal type. This could be a string or a pointer to the terminal data returned to the caller after a call to get the terminal data with a string. It is recommended to review some of the keys actions, for example C-f, to make sure they are considered standard in relation to a normal shell. One should consider cutting out the code that disables echo and obtains the password and putting it in getpass(). See the linux man page. We don't have a controlling /dev/tty so just make it work exactly like it does now.

The resulting implementation should work on GNU/Linux and RTEMS. The person undertaking this project should evaluate the provided functionality versus that in GNU readline().

Last modified on Jan 3, 2016 at 6:07:59 PM Last modified on Jan 3, 2016, 6:07:59 PM