From 3063204289b23203e35de946353585b367066fb0 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Daniel=20Ekl=C3=B6f?= <daniel@ekloef.se>
Date: Tue, 7 Jul 2020 10:42:59 +0200
Subject: [PATCH] sixel: overwrite_by_row: handle case where 'width' goes past
 end of row

Cap 'width' to maximum number of columns available.
---
 sixel.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/sixel.c b/sixel.c
index 0a28defd..6072c967 100644
--- a/sixel.c
+++ b/sixel.c
@@ -367,11 +367,14 @@ sixel_overwrite_by_row(struct terminal *term, int _row, int col, int width)
     assert(_row >= 0);
     assert(_row < term->rows);
     assert(col >= 0);
-    assert(col + width <= term->grid->num_cols);
+    assert(col < term->grid->num_cols);
 
     if (likely(tll_length(term->grid->sixel_images) == 0))
         return;
 
+    if (col + width > term->grid->num_cols)
+        width = term->grid->num_cols - col;
+
     const int row = (term->grid->offset + _row) & (term->grid->num_rows - 1);
     const int scrollback_rel_row = rebase_row(term, row);