Use UTF-8 line drawing characters on UTF-8 terminals. Fixes some stupid

terminals (I'm looking at you, putty) which disable the vt100 ACS mode
switching sequences in UTF-8 mode.

Also on terminals without ACS at all, use ASCII equivalents where
obvious.

1 files changed, 19 insertions, 36 deletions

diff --git a/tty.c b/tty.c
index bf0a48b0..642b9766 100644
--- a/tty.c
+++ b/tty.c
@@ -31,8 +31,6 @@
 void	tty_read_callback(struct bufferevent *, void *);
 void	tty_error_callback(struct bufferevent *, short, void *);
 
-void	tty_fill_acs(struct tty *);
-
 int	tty_try_256(struct tty *, u_char, const char *);
 int	tty_try_88(struct tty *, u_char, const char *);
 
@@ -48,6 +46,9 @@ void	tty_emulate_repeat(
 void	tty_cell(struct tty *,
 	    const struct grid_cell *, const struct grid_utf8 *);
 
+#define tty_use_acs(tty) \
+	(tty_term_has(tty, TTYC_ACSC) && !((tty)->flags & TTY_UTF8))
+
 void
 tty_init(struct tty *tty, int fd, char *term)
 {
@@ -143,8 +144,6 @@ tty_open(struct tty *tty, const char *overrides, char **cause)
 
 	tty_keys_init(tty);
 
-	tty_fill_acs(tty);
-
 	return (0);
 }
 
@@ -201,7 +200,8 @@ tty_start_tty(struct tty *tty)
 	memcpy(&tty->cell, &grid_default_cell, sizeof tty->cell);
 
 	tty_putcode(tty, TTYC_RMKX);
-	tty_putcode(tty, TTYC_ENACS);
+	if (tty_use_acs(tty))
+		tty_putcode(tty, TTYC_ENACS);
 	tty_putcode(tty, TTYC_CLEAR);
 
 	tty_putcode(tty, TTYC_CNORM);
@@ -242,7 +242,8 @@ tty_stop_tty(struct tty *tty)
 		return;
 
 	tty_raw(tty, tty_term_string2(tty->term, TTYC_CSR, 0, ws.ws_row - 1));
-	tty_raw(tty, tty_term_string(tty->term, TTYC_RMACS));
+	if (tty_use_acs(tty))
+		tty_raw(tty, tty_term_string(tty->term, TTYC_RMACS));
 	tty_raw(tty, tty_term_string(tty->term, TTYC_SGR0));
 	tty_raw(tty, tty_term_string(tty->term, TTYC_RMKX));
 	tty_raw(tty, tty_term_string(tty->term, TTYC_CLEAR));
@@ -258,30 +259,6 @@ tty_stop_tty(struct tty *tty)
 }
 
 void
-tty_fill_acs(struct tty *tty)
-{
-	const char *ptr;
-
-	memset(tty->acs, 0, sizeof tty->acs);
-	if (!tty_term_has(tty->term, TTYC_ACSC))
-		return;
-
-	ptr = tty_term_string(tty->term, TTYC_ACSC);
-	if (strlen(ptr) % 2 != 0)
-		return;
-	for (; *ptr != '\0'; ptr += 2)
-		tty->acs[(u_char) ptr[0]] = ptr[1];
-}
-
-u_char
-tty_get_acs(struct tty *tty, u_char ch)
-{
-	if (tty->acs[ch] != '\0')
-		return (tty->acs[ch]);
-	return (ch);
-}
-
-void
 tty_close(struct tty *tty)
 {
 	if (tty->log_fd != -1) {
@@ -360,11 +337,17 @@ tty_puts(struct tty *tty, const char *s)
 void
 tty_putc(struct tty *tty, u_char ch)
 {
-	u_int	sx;
+	const char	*acs;
+	u_int		 sx;
 
-	if (tty->cell.attr & GRID_ATTR_CHARSET)
-		ch = tty_get_acs(tty, ch);
-	bufferevent_write(tty->event, &ch, 1);
+	if (tty->cell.attr & GRID_ATTR_CHARSET) {
+		acs = tty_acs_get(tty, ch);
+		if (acs != NULL)
+			bufferevent_write(tty->event, acs, strlen(acs));
+		else
+			bufferevent_write(tty->event, &ch, 1);
+	} else
+		bufferevent_write(tty->event, &ch, 1);
 
 	if (ch >= 0x20 && ch != 0x7f) {
 		sx = tty->sx;
@@ -997,7 +980,7 @@ tty_reset(struct tty *tty)
 	if (memcmp(gc, &grid_default_cell, sizeof *gc) == 0)
 		return;
 
-	if (tty_term_has(tty->term, TTYC_RMACS) && gc->attr & GRID_ATTR_CHARSET)
+	if ((gc->attr & GRID_ATTR_CHARSET) && tty_use_acs(tty))
 		tty_putcode(tty, TTYC_RMACS);
 	tty_putcode(tty, TTYC_SGR0);
 	memcpy(gc, &grid_default_cell, sizeof *gc);
@@ -1234,7 +1217,7 @@ tty_attributes(struct tty *tty, const struct grid_cell *gc)
 	}
 	if (changed & GRID_ATTR_HIDDEN)
 		tty_putcode(tty, TTYC_INVIS);
-	if (changed & GRID_ATTR_CHARSET)
+	if ((changed & GRID_ATTR_CHARSET) && tty_use_acs(tty))
 		tty_putcode(tty, TTYC_SMACS);
 }