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diff src/eval.c @ 15589:44ea60ca593b v8.1.0802

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patch 8.1.0802: negative index doesn't work for Blob commit https://github.com/vim/vim/commit/a5be9b62480a6f338a72c01e57c9edd0bca8048b Author: Bram Moolenaar <Bram@vim.org> Date: Thu Jan 24 12:31:44 2019 +0100 patch 8.1.0802: negative index doesn't work for Blob Problem: Negative index doesn't work for Blob. Solution: Make it work, add a test. (closes https://github.com/vim/vim/issues/3856)
author Bram Moolenaar <Bram@vim.org>
date Thu, 24 Jan 2019 12:45:05 +0100
parents c2382f0d1279
children e26caeb30026
line wrap: on
line diff
--- a/src/eval.c
+++ b/src/eval.c
@@ -4723,12 +4723,13 @@ eval_index(
 		}
 		else
 		{
-		    // The resulting variable is a string of a single
-		    // character.  If the index is too big or negative the
-		    // result is empty.
+		    // The resulting variable is a byte value.
+		    // If the index is too big or negative that is an error.
+		    if (n1 < 0)
+			n1 = len + n1;
 		    if (n1 < len && n1 >= 0)
 		    {
-			int v = (int)blob_get(rettv->vval.v_blob, n1);
+			int v = blob_get(rettv->vval.v_blob, n1);
 
 			clear_tv(rettv);
 			rettv->v_type = VAR_NUMBER;