From 3999b12848214a201bf56ef416b9dac1ec63f811 Mon Sep 17 00:00:00 2001
From: miaoerduo <zhaoyu3210@foxmail.com>
Date: Fri, 3 Apr 2020 11:52:54 +0800
Subject: [PATCH 1/3] feat: set list head's prev in parse_array and
 parse_object

---
 cJSON.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/cJSON.c b/cJSON.c
index a5d3987..500fcf5 100644
--- a/cJSON.c
+++ b/cJSON.c
@@ -1509,6 +1509,10 @@ static cJSON_bool parse_array(cJSON * const item, parse_buffer * const input_buf
 success:
     input_buffer->depth--;
 
+    if (head != NULL) {
+        head->prev = current_item;
+    }
+
     item->type = cJSON_Array;
     item->child = head;
 
@@ -1681,6 +1685,10 @@ static cJSON_bool parse_object(cJSON * const item, parse_buffer * const input_bu
 success:
     input_buffer->depth--;
 
+    if (head != NULL) {
+        head->prev = current_item;
+    }
+
     item->type = cJSON_Object;
     item->child = head;
 

From a65abf2f4f1842765761a616e93c14ae25a284fd Mon Sep 17 00:00:00 2001
From: miaoerduo <zhaoyu3210@foxmail.com>
Date: Fri, 3 Apr 2020 14:07:22 +0800
Subject: [PATCH 2/3] fix: error list head's prev when detach the last item

---
 cJSON.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/cJSON.c b/cJSON.c
index 500fcf5..cc1c016 100644
--- a/cJSON.c
+++ b/cJSON.c
@@ -2210,6 +2210,12 @@ CJSON_PUBLIC(cJSON *) cJSON_DetachItemViaPointer(cJSON *parent, cJSON * const it
         /* first element */
         parent->child = item->next;
     }
+    else if (item->next == NULL)
+    {
+        /* last element */
+        parent->child->prev = item->prev;
+    }
+
     /* make sure the detached item doesn't point anywhere anymore */
     item->prev = NULL;
     item->next = NULL;

From cb4661cd91fc6d6f9e81b627967735f7072f901c Mon Sep 17 00:00:00 2001
From: miaoerduo <zhaoyu3210@foxmail.com>
Date: Fri, 3 Apr 2020 14:47:49 +0800
Subject: [PATCH 3/3] fix: errors in replacing the first item when array_size
 is 1, and replacing the last item

---
 cJSON.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/cJSON.c b/cJSON.c
index cc1c016..23270c4 100644
--- a/cJSON.c
+++ b/cJSON.c
@@ -2313,6 +2313,10 @@ CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemViaPointer(cJSON * const parent, cJSON
     }
     if (parent->child == item)
     {
+        if (parent->child->prev == parent->child)
+        {
+            replacement->prev = replacement;
+        }
         parent->child = replacement;
     }
     else
@@ -2324,6 +2328,10 @@ CJSON_PUBLIC(cJSON_bool) cJSON_ReplaceItemViaPointer(cJSON * const parent, cJSON
         {
             replacement->prev->next = replacement;
         }
+        if (replacement->next == NULL)
+        {
+            parent->child->prev = replacement;
+        }
     }
 
     item->next = NULL;