Handle overflow in Term::move_backward

Resolves #25
2016-12-15 09:09:49 -08:00 · 2016-12-15 09:09:49 -08:00 · 0b3d2dac44
parent 1a1b740c38
commit 0b3d2dac44
1 changed files with 5 additions and 1 deletions
--- a/src/term/mod.rs
+++ b/src/term/mod.rs
@ -557,7 +557,11 @@ impl ansi::Handler for Term {
    #[inline]
    fn move_backward(&mut self, cols: Column) {
        debug_println!("move_backward: {}", cols);
-        self.cursor.col -= cols;
+        if cols > self.cursor.col {
+            self.cursor.col = Column(0);
+        } else {
+            self.cursor.col -= cols;
+        }
    }

    #[inline]