Firstly, lots of places in editor(1) would do a move from (x₀,y₀) to
(x,y) by first moving to (x,y₀) or (x₀,y) and only then (x,y). If the
intermediate positions were not valid cursor positions, this might cause
out of bounds access. Categorically fixed this by removing functions for
moving only horizontally or only vertically.
Secondly, editor_select_set() would set the column before setting the
line. Since the code for setting the column accesses the currently set
line at the new cursor position, it might cause out of bounds access
even on valid cursor positions. Fixed this by swapping the order in
which column and row are set.
Thirdly, the order of arguments passed to row_column_smallest() and
row_column_biggest() was wrong, with column being passed before the row,
even though they were defined the other way. However, this did not
result in out of bounds memory accesses due to the parameters to
editor_cursor_set() also being swapped at relevant callsites.
Finally, the boundary condition for control-down was off by one.
I hereby relicense all my work on Sortix under the ISC license as below.
All Sortix contributions by other people are already under this license,
are not substantial enough to be copyrightable, or have been removed.
All imported code from other projects is compatible with this license.
All GPL licensed code from other projects had previously been removed.
Copyright 2011-2016 Jonas 'Sortie' Termansen and contributors.
Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
Juhani Krekelä
Jonas 'Sortie' Termansen