From 6c2b9d3479fbd425e0136abaadec4577b7918dbb Mon Sep 17 00:00:00 2001
From: Steve Dower <steve.dower@microsoft.com>
Date: Tue, 25 Oct 2016 11:51:54 -0700
Subject: [PATCH] Issue #28333: Fixes off-by-one error that was adding an extra
 space.

---
 Parser/myreadline.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Parser/myreadline.c b/Parser/myreadline.c
index e40951ca33e..9f3c2e343c0 100644
--- a/Parser/myreadline.c
+++ b/Parser/myreadline.c
@@ -225,7 +225,8 @@ PyOS_StdioReadline(FILE *sys_stdin, FILE *sys_stdout, const char *prompt)
                         if (wlen) {
                             DWORD n;
                             fflush(stderr);
-                            WriteConsoleW(hStdErr, wbuf, wlen, &n, NULL);
+                            /* wlen includes null terminator, so subtract 1 */
+                            WriteConsoleW(hStdErr, wbuf, wlen - 1, &n, NULL);
                         }
                         PyMem_RawFree(wbuf);
                     }