Decompile fn_20939 (TreeSubMap::Clear)

Batch #3592 by bigodeira: 0 byte-identical, 1 confirmed by peer review.

- fn_20939 TreeSubMap::Clear: logic confirmed by peer review

Peer-reviewed-by: eAthena, meitogi, Lumen
Accepted without human review: peers confirmed the logic ("same" ahead by at least 3, with 70% of the votes).

Source/Script/NLuaState.cpp

@@ -5,6 +5,47 @@ extern "C" {
 #include <lua.h>
 }
 
+// GLOBAL: gl_24849
+void* g_entryQueueMgr = nullptr;
+
+struct TreeSubNode {
+  TreeSubNode* left;
+  TreeSubNode* parent;
+  TreeSubNode* right;
+  char color;
+  char isnil;
+};
+
+struct TreeSubMap {
+  TreeSubNode* head;
+  unsigned int size;
+
+  void Clear();
+  void EraseSubtree(TreeSubMap& al, TreeSubNode* node);
+};
+
+// OFFSET: 0x00CA4AE0
+// FUNCTION: fn_20939
+void TreeSubMap::Clear() {
+  TreeSubNode* cur = this->head->parent;
+  while (cur->isnil == 0) {
+    this->EraseSubtree(*this, cur->right);
+    TreeSubNode* next = cur->left;
+    ::operator delete(cur, 0x18);
+    cur = next;
+  }
+  this->head->parent = this->head;
+  this->head->left = this->head;
+  this->head->right = this->head;
+  this->size = 0;
+}
+
+// OFFSET: 0x00CA4B60
+// FUNCTION: fn_20940
+void* sub_CA4B60() {
+  return g_entryQueueMgr;
+}
+
 // OFFSET: 0x00CA4CF0
 // FUNCTION: fn_20941
 NLuaState::NLuaState() : m_state(nullptr), m_isValid(false) {