From 24cebbda5813450b0196253cc7c26aa773f23622 Mon Sep 17 00:00:00 2001
From: lethosor <lethosor@gmail.com>
Date: Tue, 28 Apr 2020 21:38:47 -0400
Subject: [PATCH] Fix segfault when setting DFHACK_HEADLESS but not
 PRINT_MODE:TEXT

endwin() is unhappy if initscr() wasn't called
---
 library/Core.cpp | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/library/Core.cpp b/library/Core.cpp
index c0a1155c7..a9fe9a69a 100644
--- a/library/Core.cpp
+++ b/library/Core.cpp
@@ -1692,14 +1692,21 @@ bool Core::Init()
     if (is_headless)
     {
 #ifdef LINUX_BUILD
-        auto endwin = (int(*)(void))dlsym(RTLD_DEFAULT, "endwin");
-        if (endwin)
+        if (is_text_mode)
         {
-            endwin();
+            auto endwin = (int(*)(void))dlsym(RTLD_DEFAULT, "endwin");
+            if (endwin)
+            {
+                endwin();
+            }
+            else
+            {
+                cerr << "endwin(): bind failed" << endl;
+            }
         }
         else
         {
-            cerr << "endwin(): bind failed" << endl;
+            cerr << "Headless mode requires PRINT_MODE:TEXT" << endl;
         }
 #else
         cerr << "Headless mode not supported on Windows" << endl;