From 4e889f98e95ac05d7c8bd3ee933ab4d47820fdfa Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Mon, 21 Feb 2022 19:36:12 +0000
Subject: [PATCH] patch 8.2.4436: crash with weird 'vartabstop' value

Problem:    Crash with weird 'vartabstop' value.
Solution:   Check for running into the end of the line.

---
 src/indent.c                 |  2 ++
 src/testdir/test_vartabs.vim | 14 ++++++++++++++
 2 files changed, 16 insertions(+)

diff --git a/src/indent.c b/src/indent.c
index 075802c..6b8900f 100644
--- a/src/indent.c
+++ b/src/indent.c
@@ -1279,6 +1279,8 @@ change_indent(
 		new_cursor_col += (*mb_ptr2len)(ptr + new_cursor_col);
 	    else
 		++new_cursor_col;
+	    if (ptr[new_cursor_col] == NUL)
+		break;
 	    vcol += lbr_chartabsize(ptr, ptr + new_cursor_col, (colnr_T)vcol);
 	}
 	vcol = last_vcol;
diff --git a/src/testdir/test_vartabs.vim b/src/testdir/test_vartabs.vim
index 47844fb..c2919d8 100644
--- a/src/testdir/test_vartabs.vim
+++ b/src/testdir/test_vartabs.vim
@@ -378,3 +378,17 @@ func Test_vartabs_reset()
   set all&
   call assert_equal('', &vts)
 endfunc
+
+func Test_vartabstop_latin1()
+  let save_encoding = &encoding
+  new
+  set encoding=iso8859
+  silent norm :se 

+  set vartabstop=400
+  norm i00	
+  bwipe!
+  let &encoding = save_encoding
+endfunc
+
+
+" vim: shiftwidth=2 sts=2 expandtab
-- 
2.27.0