tree 48f24ea664b9ad54a4b7ae8b028522d68504c1b2
parent 55f969a006109703dd056bee1b6c1d11b0602449
author Ron Yorston <rmy@pobox.com> 1646307346 +0000
committer Denys Vlasenko <vda.linux@googlemail.com> 1646431025 +0100

vi: improved handling of backspace in replace mode

In replace mode ('R' command) the backspace character should get
special treatment:

- backspace only goes back to the start of the replacement;
- backspacing over replaced characters restores the original text.

Prior to this commit BusyBox vi deleted the characters both before
and after the cursor in replace mode.

function                                             old     new   delta
undo_pop                                               -     235    +235
char_insert                                          858     884     +26
indicate_error                                        81      84      +3
find_range                                           654     657      +3
static.text_yank                                      77      79      +2
do_cmd                                              4486    4243    -243
------------------------------------------------------------------------------
(add/remove: 1/0 grow/shrink: 4/1 up/down: 269/-243)           Total: 26 bytes

Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>