PROJECTS

$OpenBSD: PROJECTS,v 1.9 2018/01/08 12:08:17 jca Exp $

Things to be done in pdksh (see also the NOTES file):

    * builtin utilities:
      pdksh has most if not all POSIX/at&t ksh builtins, but they need to
      be checked that they conform to POSIX/at&t manual.  Part of the
      process is changing the builtins to use the ksh_getopt() routine.

      The following builtins, which are defined by POSIX, haven't been
      examined:
	eval

      The first pass has been done on the following commands:
	. : alias bg break cd continue echo exec exit export false fc fg
	getopts jobs kill pwd read readonly return set shift time trap true
	umask unalias unset wait

      The second pass (ie, believed to be completely POSIX) has been done on
      the following commands:
	test

      (ulimit also needs to be examined to check that it fits the posix style)

    * trap code
	* add the DEBUG trap.
	* fix up signal handling code.  In particular, fatal vs tty signals,
	  have signal routine to call to check for pending/fatal traps, etc.

    * lexing
      the lexing may need a re-write since it currently doesn't parse $( .. ),
      $(( .. )), (( ... )) properly.
	* need to ignore contents of quoted strings (and escaped chars?)
	  inside $( .. ) and $(( .. )) when counting parentheses.
	* need to put bounds check on states[] array (if it still exists after
	  the re-write)

    * variables
	* The "struct tbl" that is currently used for variables needs work since
	  more information (eg, array stuff, fields) are needed for variables
	  but not for the other things that use "struct tbl".
	* Arrays need to be implemented differently: currently does a linear
	  search of a linked list to find element i; the linked list is not
	  freed when a variable is unset.

    * functions
      finish the differences between function x and x(): trap EXIT, traps
      in general, treatment of OPTIND/OPTARG,

    * history
	* Add multiline knowledge
	* bring history code up to POSIX standards (see POSIX description
	  of fc, etc.).

    * miscellaneous
	* POSIX specifies what happens when various kinds of errors occur
	  in special built-ins commands vs regular commands (builtin or
	  otherwise) (see POSIX.2:3.8.1).  Some of this has been taken
	  care of, but more needs doing.

	* remove static limits created by fixed sized arrays
	  (eg, ident[], heres[], PATH, buffer size in emacs/vi code)

	* merge the emacs and vi code (should reduce the size of the shell and
	  make maintenance easier); handle SIGWINCH while editing a line.
	  [John Rochester is working on the merge]