nano

commit f162a6a2ab7c14eef2ad4636a8033e90422c4b3a
parent 5a3de7f117d2b818ca383c2152c4a018b5358cce
Author: Benno Schulenberg <bensberg@justemail.net>
Date:   Tue,  2 May 2017 10:50:43 +0200

chars: valid UTF-8 codes are at most 4 bytes long, so look only that far

This reduces the backwards searching time by a good 20 percent.

Diffstat:
M
src/chars.c
 | 
4
++--

1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/src/chars.c b/src/chars.c
@@ -381,10 +381,10 @@ size_t move_mbleft(const char *buf, size_t pos)
     /* There is no library function to move backward one multibyte
      * character.  So we just start groping for one at the farthest
      * possible point. */
-    if (pos < MAXCHARLEN)
+    if (pos < 4)
 	before = 0;
     else
-	before = pos - MAXCHARLEN;
+	before = pos - 4;
 
     while (before < pos) {
 	char_len = parse_mbchar(buf + before, NULL, NULL);