[git commit] vi: use basic regular expressions for search

[Denys Vlasenko]

commit: https://git.busybox.net/busybox/commit/?id=2916443ab650b10fd401ceb221d26fa58e2e99b3
branch: https://git.busybox.net/busybox/commit/?id=refs/heads/master

Both traditional vi and vim use basic regular expressions for
search.  Also, they don't allow matches to extend across line
endings.  Thus with the file:

   123
   234

the search '/2.*4$' should find the second '2', not the first.

Make BusyBox vi do the same.

Whether or not VI_REGEX_SEARCH is enabled:

function                                             old     new   delta
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/0 up/down: 0/0)                 Total: 0 bytes

Signed-off-by: Andrey Dobrovolsky <andrey.dobrovolsky.odessa at gmail.com>
Signed-off-by: Ron Yorston <rmy at pobox.com>
Signed-off-by: Denys Vlasenko <vda.linux at googlemail.com>
---
 editors/vi.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/editors/vi.c b/editors/vi.c
index 22b8f7cf1..34d577e90 100644
--- a/editors/vi.c
+++ b/editors/vi.c
@@ -2378,9 +2378,9 @@ static char *char_search(char *p, const char *pat, int dir_and_range)
 	char *q;
 	int i, size, range, start;
 
-	re_syntax_options = RE_SYNTAX_POSIX_EXTENDED;
+	re_syntax_options = RE_SYNTAX_POSIX_BASIC & (~RE_DOT_NEWLINE);
 	if (ignorecase)
-		re_syntax_options = RE_SYNTAX_POSIX_EXTENDED | RE_ICASE;
+		re_syntax_options |= RE_ICASE;
 
 	memset(&preg, 0, sizeof(preg));
 	err = re_compile_pattern(pat, strlen(pat), &preg);