From 1d6d32d044e67fc984e5c1b8361460844fec52db Mon Sep 17 00:00:00 2001
From: mrb0nk500 <b0nk@b0nk.xyz>
Date: Wed, 27 Jul 2022 08:40:12 -0300
Subject: linked_list: Add `cleanup_linked_list()`

This function cleans up a linked list by removing every node in the
list.
---
 linked_list.c | 32 +++++++++++++++++++++-----------
 linked_list.h |  5 +++--
 2 files changed, 24 insertions(+), 13 deletions(-)

diff --git a/linked_list.c b/linked_list.c
index 792da4d..3c694be 100644
--- a/linked_list.c
+++ b/linked_list.c
@@ -1,6 +1,18 @@
 #include <stdlib.h>
 #include "linked_list.h"
 
+linked_list *get_head(linked_list *node) {
+	linked_list *head;
+	for (head = node; head != NULL && head->prev != NULL; head = head->prev);
+	return head;
+}
+
+linked_list *get_tail(linked_list *node) {
+	linked_list *tail;
+	for (tail = node; tail != NULL && tail->next != NULL; tail = tail->next);
+	return tail;
+}
+
 linked_list *add_node(linked_list **tail, void *data) {
 	if (tail == NULL) {
 		return NULL;
@@ -25,7 +37,6 @@ linked_list *add_node(linked_list **tail, void *data) {
 	}
 }
 
-
 void remove_node(linked_list *node) {
 	if (node != NULL) {
 		if (node->prev != NULL) {
@@ -40,16 +51,15 @@ void remove_node(linked_list *node) {
 	}
 }
 
-linked_list *get_head(linked_list *node) {
-	linked_list *head;
-	for (head = node; head != NULL && head->prev != NULL; head = head->prev);
-	return head;
-}
-
-linked_list *get_tail(linked_list *node) {
-	linked_list *tail;
-	for (tail = node; tail != NULL && tail->next != NULL; tail = tail->next);
-	return tail;
+void cleanup_linked_list(linked_list *node) {
+	if (node != NULL) {
+		for (node = get_tail(node); node != NULL; node = node->prev) {
+			if (node->next != NULL) {
+				remove_node(node->next);
+			}
+		}
+		remove_node(node);
+	}
 }
 
 int linked_list_size(linked_list *tail) {
diff --git a/linked_list.h b/linked_list.h
index 643e4f2..d18b859 100644
--- a/linked_list.h
+++ b/linked_list.h
@@ -9,10 +9,11 @@ struct linked_list {
 	void *data;		/* Pointer to data. */
 };
 
-extern linked_list *add_node(linked_list **tail, void *data);
-extern void remove_node(linked_list *node);
 extern linked_list *get_head(linked_list *node);
 extern linked_list *get_tail(linked_list *node);
+extern linked_list *add_node(linked_list **tail, void *data);
+extern void remove_node(linked_list *node);
+extern void cleanup_linked_list(linked_list *node);
 extern int linked_list_size(linked_list *tail);
 
 #endif
-- 
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