From 2de599ac0ec0634282a52711378258e25839bc7f Mon Sep 17 00:00:00 2001
From: Nicholas Marriott <nicm@openbsd.org>
Date: Wed, 24 Jun 2009 16:01:02 +0000
Subject: [PATCH] Trying to predict the cursor position for UTF-8 output in the
 same way as for normal eight-bit output is wrong, separate it into a
 different function. Fixes spacing when mixing UTF-8 with some escape
 sequences, notably the way w3m does it.

---
 tmux.h |  1 +
 tty.c  | 23 ++++++++++++++++++-----
 2 files changed, 19 insertions(+), 5 deletions(-)

diff --git a/tmux.h b/tmux.h
index 04088a16..2052b498 100644
--- a/tmux.h
+++ b/tmux.h
@@ -994,6 +994,7 @@ void		 tty_putcode1(struct tty *, enum tty_code_code, int);
 void		 tty_putcode2(struct tty *, enum tty_code_code, int, int);
 void		 tty_puts(struct tty *, const char *);
 void		 tty_putc(struct tty *, u_char);
+void		 tty_pututf8(struct tty *, const struct grid_utf8 *);
 void		 tty_init(struct tty *, char *, char *);
 void		 tty_start_tty(struct tty *);
 void		 tty_stop_tty(struct tty *);
diff --git a/tty.c b/tty.c
index 3149c8fb..d0c89afd 100644
--- a/tty.c
+++ b/tty.c
@@ -408,6 +408,23 @@ tty_putc(struct tty *tty, u_char ch)
 		write(tty->log_fd, &ch, 1);
 }
 
+void
+tty_pututf8(struct tty *tty, const struct grid_utf8 *gu)
+{
+	u_int	i, width;
+
+	for (i = 0; i < UTF8_SIZE; i++) {
+		if (gu->data[i] == 0xff)
+			break;
+		buffer_write8(tty->out, gu->data[i]);
+		if (tty->log_fd != -1)
+			write(tty->log_fd, &gu->data[i], 1);
+	}
+
+	width = utf8_width(gu->data);
+	tty->cx += width;
+}
+
 void
 tty_set_title(struct tty *tty, const char *title)
 {
@@ -912,11 +929,7 @@ tty_cell(
 	}
 
 	/* Otherwise, write UTF-8. */
-	for (i = 0; i < UTF8_SIZE; i++) {
-		if (gu->data[i] == 0xff)
-			break;
-		tty_putc(tty, gu->data[i]);
-	}
+	tty_pututf8(tty, gu);
 }
 
 void