BusyBox vi has never supported the use of regular expressions in
search/replace (':s') commands. Implement this using GNU regex
when VI_REGEX_SEARCH is enabled.
The implementation:
- uses basic regular expressions, to match those used in the search
command;
- only supports substitution of back references ('\0' - '\9') in the
replacement string. Any other character following a backslash is
treated as that literal character.
VI_REGEX_SEARCH isn't enabled in the default build. In that case:
function old new delta
colon 4036 4033 -3
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/1 up/down: 0/-3) Total: -3 bytes
When VI_REGEX_SEARCH is enabled:
function old new delta
colon 4036 4378 +342
.rodata 108207 108229 +22
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 2/0 up/down: 364/0) Total: 364 bytes
v2: Rebase. Code shrink. Ensure empty replacement string is null terminated.
Signed-off-by: Andrey Dobrovolsky <andrey.dobrovolsky.odessa@gmail.com>
Signed-off-by: Ron Yorston <rmy@pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
95ac4a48f1