From bf70fcbfedbe544a7e8dd1f444e8abe1bbd31da1 Mon Sep 17 00:00:00 2001
From: C. McEnroe
Date: Sat, 9 Jan 2021 17:28:42 -0500
Subject: Count width of 2 for invalid multibyte with high bit

---
 buffer.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

(limited to 'buffer.c')

diff --git a/buffer.c b/buffer.c
index 15d89f8..bdf9e3a 100644
--- a/buffer.c
+++ b/buffer.c
@@ -123,17 +123,18 @@ static int flow(struct Lines *hard, int cols, const struct Line *soft) {
 		int n = mbtowc(&wc, str, len);
 		if (n < 0) {
 			n = 1;
-			width++;
+			// ncurses will render these as "~A".
+			width += (*str & '\200' ? 2 : 1);
 		} else if (wc == ZWS || wc == ZWNJ) {
-			// XXX: ncurses likes to render these as spaces when they should be
+			// ncurses likes to render these as spaces when they should be
 			// zero-width, so just remove them entirely.
 			memmove(str, &str[n], strlen(&str[n]) + 1);
 			continue;
 		} else if (wc == L'\t') {
-			// XXX: Assuming TABSIZE = 8.
+			// Assuming TABSIZE = 8.
 			width += 8 - (width % 8);
 		} else if (wc < L' ' || wc == L'\177') {
-			// XXX: ncurses will render these as "^A".
+			// ncurses will render these as "^A".
 			width += 2;
 		} else if (wcwidth(wc) > 0) {
 			width += wcwidth(wc);
-- 
cgit 1.4.1-2-gfad0