[PATCH 21/29] ui/ncurses/text-screen: trim long lines

[Samuel Mendoza-Jonas]

From: Jeremy Kerr <jk at ozlabs.org>

When a text_screen is given a long line, it'll wrap to the next,
overstepping the left margin.

We already have folded text for flowed text screens, so just trim long
lines at the correct column.

This exposes an off-by-one with the automatic wrapping in
text_screen_set_text(), where we may overrun the last char, so fix that
too.

Signed-off-by: Jeremy Kerr <jk at ozlabs.org>
Signed-off-by: Samuel Mendoza-Jonas <sam at mendozajonas.com>
---
 ui/ncurses/nc-textscreen.c | 17 ++++++++++-------
 1 file changed, 10 insertions(+), 7 deletions(-)

diff --git a/ui/ncurses/nc-textscreen.c b/ui/ncurses/nc-textscreen.c
index 55428e7..a460188 100644
--- a/ui/ncurses/nc-textscreen.c
+++ b/ui/ncurses/nc-textscreen.c
@@ -41,14 +41,15 @@ struct text_screen *text_screen_from_scr(struct nc_scr *scr)
 
 void text_screen_draw(struct text_screen *screen)
 {
-	int max_y, i;
+	int max_y, max_x, i;
 
 	max_y = getmaxy(screen->scr.sub_ncw);
+	max_x = getmaxx(screen->scr.sub_ncw) - 1;
 
 	max_y = min(max_y, screen->scroll_y + screen->n_lines);
 
 	for (i = screen->scroll_y; i < max_y; i++)
-		mvwaddstr(screen->scr.sub_ncw, i, 1, screen->lines[i]);
+		mvwaddnstr(screen->scr.sub_ncw, i, 1, screen->lines[i], max_x);
 
 	wrefresh(screen->scr.sub_ncw);
 }
@@ -56,6 +57,7 @@ void text_screen_draw(struct text_screen *screen)
 static void text_screen_scroll(struct text_screen *screen, int key)
 {
 	int win_lines = getmaxy(screen->scr.sub_ncw);
+	int win_cols = getmaxx(screen->scr.sub_ncw) - 1;
 	int delta;
 
 	if (key == KEY_UP)
@@ -74,11 +76,12 @@ static void text_screen_scroll(struct text_screen *screen, int key)
 	wscrl(screen->scr.sub_ncw, delta);
 
 	if (delta > 0) {
-		mvwaddstr(screen->scr.sub_ncw, win_lines - 1, 1,
-				screen->lines[screen->scroll_y+win_lines-1]);
+		mvwaddnstr(screen->scr.sub_ncw, win_lines - 1, 1,
+				screen->lines[screen->scroll_y+win_lines-1],
+				win_cols);
 	} else if (delta < 0) {
-		mvwaddstr(screen->scr.sub_ncw, 0, 1,
-				screen->lines[screen->scroll_y]);
+		mvwaddnstr(screen->scr.sub_ncw, 0, 1,
+				screen->lines[screen->scroll_y], win_cols);
 	}
 
 	wrefresh(screen->scr.sub_ncw);
@@ -135,7 +138,7 @@ static int text_screen_fold_cb(void *arg, const char *buf, int len)
 
 void text_screen_set_text(struct text_screen *screen, const char *text)
 {
-	fold_text(text, getmaxx(screen->scr.sub_ncw), text_screen_fold_cb,
+	fold_text(text, getmaxx(screen->scr.sub_ncw) - 1, text_screen_fold_cb,
 			screen);
 }
 
-- 
2.10.2