# HG changeset patch
# User Christian Brabandt <cb@256bit.org>
# Date 1491856203 -7200
# Node ID 251f1833db7da77fcf8729ef0e49639ccc9ae0c6
# Parent  9f40755e5429e137d0e3a393c4a77e7726de4c84
patch 8.0.0561: undefined behavior when using backslash after empty line

commit https://github.com/vim/vim/commit/478af67dd6a9adc456464c3736bda328ae3a28cb
Author: Bram Moolenaar <Bram@vim.org>
Date:   Mon Apr 10 22:22:42 2017 +0200

    patch 8.0.0561: undefined behavior when using backslash after empty line

    Problem:    Undefined behavior when using backslash after empty line.
    Solution:   Check for an empty line. (Dominique Pelle, closes https://github.com/vim/vim/issues/1631)

diff --git a/src/misc2.c b/src/misc2.c
--- a/src/misc2.c
+++ b/src/misc2.c
@@ -2129,7 +2129,7 @@ ga_concat(garray_T *gap, char_u *s)
 {
     int    len;
 
-    if (s == NULL)
+    if (s == NULL || *s == NUL)
 	return;
     len = (int)STRLEN(s);
     if (ga_grow(gap, len) == OK)
diff --git a/src/testdir/test_vimscript.vim b/src/testdir/test_vimscript.vim
--- a/src/testdir/test_vimscript.vim
+++ b/src/testdir/test_vimscript.vim
@@ -1310,6 +1310,17 @@ func Test_script_lines()
 endfunc
 
 "-------------------------------------------------------------------------------
+" Test 96:  line continuation						    {{{1
+"
+"           Undefined behavior was detected by ubsan with line continuation
+"           after an empty line.
+"-------------------------------------------------------------------------------
+func Test_script_emty_line_continuation()
+
+    \
+endfunc
+
+"-------------------------------------------------------------------------------
 " Modelines								    {{{1
 " vim: ts=8 sw=4 tw=80 fdm=marker
 " vim: fdt=substitute(substitute(foldtext(),\ '\\%(^+--\\)\\@<=\\(\\s*\\)\\(.\\{-}\\)\:\ \\%(\"\ \\)\\=\\(Test\ \\d*\\)\:\\s*',\ '\\3\ (\\2)\:\ \\1',\ \"\"),\ '\\(Test\\s*\\)\\(\\d\\)\\D\\@=',\ '\\1\ \\2',\ "")
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -765,6 +765,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    561,
+/**/
     560,
 /**/
     559,