From 7d3a555464e1b6b4b55ea7929b95cb47f04c0efb Mon Sep 17 00:00:00 2001
From: Benno Schulenberg <bensberg@telfort.nl>
Date: Sun, 24 Jan 2021 17:03:22 +0100
Subject: [PATCH] tweaks: avoid the vague possibility of advancing beyond
 end-of-line

Like the other two fragments that advance over a zero-length match,
also this fragment should avoid the possibility of stepping beyond
the end of the line.
---
 src/winio.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/src/winio.c b/src/winio.c
index c65bbbc6..a16f8116 100644
--- a/src/winio.c
+++ b/src/winio.c
@@ -2524,6 +2524,8 @@ void draw_row(int row, const char *converted, linestruct *line, size_t from_col)
 
 					/* If the match has length zero, advance over it. */
 					if (match.rm_so == match.rm_eo) {
+						if (line->data[index] == '\0')
+							break;
 						index = step_right(line->data, index);
 						continue;
 					}