From 396b7c78c0fd9cd07528963b18c27398491df40d Mon Sep 17 00:00:00 2001
From: Bram Moolenaar <Bram@vim.org>
Date: Mon, 21 Oct 2019 23:08:59 +0200
Subject: patch 8.1.2198: crash when using :center in autocommand

Problem:    Crash when using :center in autocommand.
Solution:   Bail out early for an empty line. (Dominique pelle, closes #5095)
---
 src/ex_cmds.c                   | 13 +++++++++----
 src/testdir/test_textformat.vim | 20 ++++++++++++++++++++
 src/version.c                   |  2 ++
 3 files changed, 31 insertions(+), 4 deletions(-)

(limited to 'src')

diff --git a/src/ex_cmds.c b/src/ex_cmds.c
index bcff7ee71..e472c8a6f 100644
--- a/src/ex_cmds.c
+++ b/src/ex_cmds.c
@@ -251,18 +251,23 @@ linelen(int *has_tab)
     int	    save;
     int	    len;
 
-    /* find the first non-blank character */
+    // Get the line.  If it's empty bail out early (could be the empty string
+    // for an unloaded buffer).
     line = ml_get_curline();
+    if (*line == NUL)
+	return 0;
+
+    // find the first non-blank character
     first = skipwhite(line);
 
-    /* find the character after the last non-blank character */
+    // find the character after the last non-blank character
     for (last = first + STRLEN(first);
 				last > first && VIM_ISWHITE(last[-1]); --last)
 	;
     save = *last;
     *last = NUL;
-    len = linetabsize(line);		/* get line length */
-    if (has_tab != NULL)		/* check for embedded TAB */
+    len = linetabsize(line);		// get line length
+    if (has_tab != NULL)		// check for embedded TAB
 	*has_tab = (vim_strchr(first, TAB) != NULL);
     *last = save;
 
diff --git a/src/testdir/test_textformat.vim b/src/testdir/test_textformat.vim
index 13fb50b98..3a0552b83 100644
--- a/src/testdir/test_textformat.vim
+++ b/src/testdir/test_textformat.vim
@@ -1,4 +1,7 @@
 " Tests for the various 'formatoptions' settings
+
+source check.vim
+
 func Test_text_format()
   enew!
 
@@ -489,3 +492,20 @@ func Test_format_list_auto()
   bwipe!
   set fo& ai& bs&
 endfunc
+
+func Test_crash_github_issue_5095()
+  CheckFeature autocmd
+
+  " This used to segfault, see https://github.com/vim/vim/issues/5095
+  augroup testing
+    au BufNew x center
+  augroup END
+
+  next! x
+
+  bw
+  augroup testing
+    au!
+  augroup END
+  augroup! testing
+endfunc
diff --git a/src/version.c b/src/version.c
index 549b7eea7..77e6e35be 100644
--- a/src/version.c
+++ b/src/version.c
@@ -741,6 +741,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    2198,
 /**/
     2197,
 /**/
-- 
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