From baaee906a2093d18e1392a55928b312d8c995a1c Mon Sep 17 00:00:00 2001
From: Putnam <putnam3145@gmail.com>
Date: Mon, 11 May 2020 22:01:20 -0700
Subject: [PATCH] fixin' a multiz segfault

---
 .../space_management/multiz_helpers.dm        | 19 +++++++++++++++++--
 1 file changed, 17 insertions(+), 2 deletions(-)

diff --git a/code/modules/mapping/space_management/multiz_helpers.dm b/code/modules/mapping/space_management/multiz_helpers.dm
index f6db12420a..970c25ee9b 100644
--- a/code/modules/mapping/space_management/multiz_helpers.dm
+++ b/code/modules/mapping/space_management/multiz_helpers.dm
@@ -7,6 +7,20 @@
 		return get_step(SSmapping.get_turf_below(get_turf(ref)), dir)
 	return get_step(ref, dir)
 
+/proc/get_multiz_accessible_levels(center_z)
+	. = list(center_z)
+	var/other_z = center_z
+	var/offset
+	while((offset = SSmapping.level_trait(other_z, ZTRAIT_DOWN)))
+		other_z += offset
+		. += other_z
+	other_z = center_z
+	while((offset = SSmapping.level_trait(other_z, ZTRAIT_UP)))
+		other_z += offset
+		. += other_z
+	return .
+
+
 /proc/get_dir_multiz(turf/us, turf/them)
 	us = get_turf(us)
 	them = get_turf(them)
@@ -38,10 +52,11 @@
 	if((holder == NONE) || (holder == (UP|DOWN)))
 		return turn(dir, 180)
 	dir &= ~(UP|DOWN)
-	dir = turn(dir, 180)
+	if(dir != 0)
+		dir = turn(dir, 180)
 	if(holder == UP)
 		holder = DOWN
 	else
 		holder = UP
 	dir |= holder
-	return dir
\ No newline at end of file
+	return dir