From 81215e5a72bb9947505523294f58eed5ab5513f8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Ekl=C3=B6f?= <daniel@ekloef.se>
Date: Sat, 16 Nov 2019 12:14:58 +0100
Subject: [PATCH] term: cursor_{up,down}: limit cursor movements based on
 origin mode

---
 terminal.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/terminal.c b/terminal.c
index 8b7d6fa2..98551d3f 100644
--- a/terminal.c
+++ b/terminal.c
@@ -1060,14 +1060,20 @@ term_cursor_right(struct terminal *term, int count)
 void
 term_cursor_up(struct terminal *term, int count)
 {
-    int move_amount = min(term->cursor.row, count);
+    int top = term->origin == ORIGIN_ABSOLUTE ? 0 : term->scroll_region.start;
+    assert(term->cursor.row >= top);
+
+    int move_amount = min(term->cursor.row - top, count);
     term_cursor_to(term, term->cursor.row - move_amount, term->cursor.col);
 }
 
 void
 term_cursor_down(struct terminal *term, int count)
 {
-    int move_amount = min(term->rows - term->cursor.row - 1, count);
+    int bottom = term->origin == ORIGIN_ABSOLUTE ? term->rows : term->scroll_region.end;
+    assert(bottom >= term->cursor.row);
+
+    int move_amount = min(bottom - term->cursor.row - 1, count);
     term_cursor_to(term, term->cursor.row + move_amount, term->cursor.col);
 }