From cbd21e1da0d763225e7ea3594d4e6d8e96863790 Mon Sep 17 00:00:00 2001
From: Marvin Borner
Date: Tue, 30 May 2023 23:05:30 +0200
Subject: Added hash-based approach

---
 src/lib/queue.c | 61 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 61 insertions(+)
 create mode 100644 src/lib/queue.c

(limited to 'src/lib/queue.c')

diff --git a/src/lib/queue.c b/src/lib/queue.c
new file mode 100644
index 0000000..f039257
--- /dev/null
+++ b/src/lib/queue.c
@@ -0,0 +1,61 @@
+// Copyright (c) 2023, Marvin Borner <dev@marvinborner.de>
+// SPDX-License-Identifier: MIT
+
+#include <stdlib.h>
+
+#include <lib/queue.h>
+#include <log.h>
+
+struct queue *queue_new(void)
+{
+	struct queue *queue = malloc(sizeof(*queue));
+	if (!queue)
+		fatal("out of memory!\n");
+	queue->head = 0;
+	queue->tail = 0;
+	return queue;
+}
+
+void queue_free(struct queue *queue)
+{
+	while (queue->head) {
+		struct queue_node *node = queue->head;
+		queue->head = node->next;
+		free(node);
+	}
+	free(queue);
+}
+
+void queue_push(struct queue *queue, void *data)
+{
+	struct queue_node *node = malloc(sizeof(*node));
+	if (!node)
+		fatal("out of memory!\n");
+	node->data = data;
+	node->next = 0;
+	if (queue->tail) {
+		queue->tail->next = node;
+		queue->tail = node;
+	} else {
+		queue->head = node;
+		queue->tail = node;
+	}
+}
+
+void *queue_pop(struct queue *queue)
+{
+	if (!queue->head)
+		return 0;
+	struct queue_node *node = queue->head;
+	queue->head = node->next;
+	if (!queue->head)
+		queue->tail = 0;
+	void *data = node->data;
+	free(node);
+	return data;
+}
+
+int queue_empty(struct queue *queue)
+{
+	return !queue->head;
+}
-- 
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