From 90cc056dcd7ef04405c7e4d5535eb4ad2a349155 Mon Sep 17 00:00:00 2001
From: Rob Landley <rob@landley.net>
Date: Thu, 20 Jun 2019 16:59:49 -0500
Subject: Teach dlist_pop() to work on a dlist_terminate()d list

---
 lib/llist.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

(limited to 'lib/llist.c')

diff --git a/lib/llist.c b/lib/llist.c
index dbb5352a..2969102d 100644
--- a/lib/llist.c
+++ b/lib/llist.c
@@ -55,10 +55,12 @@ void *dlist_pop(void *list)
 {
   struct double_list **pdlist = (struct double_list **)list, *dlist = *pdlist;
 
+  if (!dlist) return 0;
   if (dlist->next == dlist) *pdlist = 0;
   else {
-    dlist->next->prev = dlist->prev;
-    dlist->prev->next = *pdlist = dlist->next;
+    if (dlist->next) dlist->next->prev = dlist->prev;
+    if (dlist->prev) dlist->prev->next = dlist->next;
+    *pdlist = dlist->next;
   }
 
   return dlist;
-- 
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