# HG changeset patch
# User Christian Brabandt <cb@256bit.org>
# Date 1461412805 -7200
# Node ID 42beb54724faeece49399d13a05fb8b7d11091ec
# Parent  dd79f120c9d5cbeedd0b07756e5935625c1084af
commit https://github.com/vim/vim/commit/73dfe917ba6357413aaf98a021c91add5ac6e9bc
Author: Bram Moolenaar <Bram@vim.org>
Date:   Sat Apr 23 13:54:48 2016 +0200

    patch 7.4.1779
    Problem:    Using negative index in strcharpart(). (Yegappan Lakshmanan)
    Solution:   Assume single byte when using a negative iindex.

diff --git a/src/eval.c b/src/eval.c
--- a/src/eval.c
+++ b/src/eval.c
@@ -19774,7 +19774,12 @@ f_strcharpart(typval_T *argvars, typval_
 	    charlen = get_tv_number(&argvars[2]);
 	    while (charlen > 0 && nbyte + len < slen)
 	    {
-		len += mb_char2len(p[nbyte + len]);
+		int off = nbyte + len;
+
+		if (off < 0)
+		    len += 1;
+		else
+		    len += mb_char2len(p[off]);
 		--charlen;
 	    }
 	}
diff --git a/src/version.c b/src/version.c
--- a/src/version.c
+++ b/src/version.c
@@ -754,6 +754,8 @@ static char *(features[]) =
 static int included_patches[] =
 {   /* Add new patch number below this line */
 /**/
+    1779,
+/**/
     1778,
 /**/
     1777,