From acee29c374353447c8e3bcce7c26000a991e2f6f Mon Sep 17 00:00:00 2001
From: ENGO150 <v.smejkal06@gmail.com>
Date: Wed, 12 Apr 2023 17:02:34 +0200
Subject: [PATCH] declared why2_remove_back function

removes last element

so this is 1000th commit! Woah... i gone nuts

idk...

860917976483233792
---
 include/llist.h            |  1 +
 src/core/lib/utils/llist.c | 24 ++++++++++++++++++++++++
 2 files changed, 25 insertions(+)

diff --git a/include/llist.h b/include/llist.h
index 6fca169..3422fff 100644
--- a/include/llist.h
+++ b/include/llist.h
@@ -27,6 +27,7 @@ typedef struct _why2_node
 
 void why2_push(why2_node_t *llist_head, void *value); //PUSH ELEMENT TO LIST BACK
 void why2_remove(why2_node_t *llist_head, why2_node_t *node); //REMOVE ELEMENT
+void why2_remove_back(why2_node_t *llist_head); //REMOVE LAST ELEMENT
 why2_node_t *why2_find(why2_node_t *llist_head, void *value); //FIND ELEMENT IN LIST
 
 #endif
\ No newline at end of file
diff --git a/src/core/lib/utils/llist.c b/src/core/lib/utils/llist.c
index da6c017..88c35f1 100644
--- a/src/core/lib/utils/llist.c
+++ b/src/core/lib/utils/llist.c
@@ -78,6 +78,30 @@ void why2_remove(why2_node_t *llist_head, why2_node_t *node)
     free(node);
 }
 
+void why2_remove_back(why2_node_t *llist_head)
+{
+    if (llist_head == NULL) return; //EMPTY LIST
+
+    why2_node_t *buffer = llist_head;
+    why2_node_t *deallocating_node;
+
+    if (buffer -> next == NULL) //ONLY ONE NODE
+    {
+        deallocating_node = buffer;
+
+        llist_head = NULL;
+    } else
+    {
+        while (buffer -> next -> next != NULL) buffer = buffer -> next; //GO TO THE NODE BEFORE END
+
+        deallocating_node = buffer -> next;
+
+        buffer -> next = NULL; //UNLINK
+    }
+
+    free(deallocating_node);
+}
+
 why2_node_t *why2_find(why2_node_t *llist_head, void *value)
 {
     if (llist_head == NULL) return NULL; //EMPTY LIST