From e8ddbbdf07838a99545181a5f63d460f4ea7e8a4 Mon Sep 17 00:00:00 2001
From: "Justin M. Keyes" <justinkz@gmail.com>
Date: Tue, 25 Oct 2016 15:33:57 +0200
Subject: [PATCH] list_features(): Hack around infinite loop.

msg_putchar() is not updating msg_col, this causes an infinite loop. Observed
with execute('version') *nested* in another execute(), in particular this line:
    let buildtype = matchstr(execute('version'), '\v\cbuild type:?\s*[^\n\r\t ]+')
when called by :CheckHealth (see runtime/autoload/health/nvim ..
s:check_performance()).

But invoking some variation of execute('...execute("version")') is not enough to
provoke the bug, maybe it needs to be in a user function?
---
 src/nvim/version.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/nvim/version.c b/src/nvim/version.c
index 6b9c8bf6b1..54f03cd3dd 100644
--- a/src/nvim/version.c
+++ b/src/nvim/version.c
@@ -2570,7 +2570,11 @@ static void list_features(void)
         }
       } else {
         while (msg_col % width) {
+          int old_msg_col = msg_col;
           msg_putchar(' ');
+          if (old_msg_col == msg_col) {
+            break;  // XXX: Avoid infinite loop.
+          }
         }
       }
     } else {