1 files changed, 89 insertions, 0 deletions
diff --git a/queue.c b/queue.c
new file mode 100644
index 0000000..7a80124
--- /dev/null
+++ b/queue.c
@@ -0,0 +1,89 @@
+/*
+ * Dropbear - a SSH2 server
+ * 
+ * Copyright (c) 2002,2003 Matt Johnston
+ * All rights reserved.
+ * 
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ * 
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+ * SOFTWARE. */
+
+#include "includes.h"
+#include "dbutil.h"
+#include "queue.h"
+
+void initqueue(struct Queue* queue) {
+
+	queue->head = NULL;
+	queue->tail = NULL;
+	queue->count = 0;
+}
+
+int isempty(struct Queue* queue) {
+
+	return (queue->head == NULL);
+}
+	
+void* dequeue(struct Queue* queue) {
+
+	void* ret;
+	struct Link* oldhead;
+	dropbear_assert(!isempty(queue));
+	
+	ret = queue->head->item;
+	oldhead = queue->head;
+	
+	if (oldhead->link != NULL) {
+		queue->head = oldhead->link;
+	} else {
+		queue->head = NULL;
+		queue->tail = NULL;
+		TRACE(("empty queue dequeing"))
+	}
+
+	m_free(oldhead);
+	queue->count--;
+	return ret;
+}
+
+void *examine(struct Queue* queue) {
+
+	dropbear_assert(!isempty(queue));
+	return queue->head->item;
+}
+
+void enqueue(struct Queue* queue, void* item) {
+
+	struct Link* newlink;
+
+	TRACE(("enter enqueue"))
+	newlink = (struct Link*)m_malloc(sizeof(struct Link));
+
+	newlink->item = item;
+	newlink->link = NULL;
+
+	if (queue->tail != NULL) {
+		queue->tail->link = newlink;
+	}
+	queue->tail = newlink;
+
+	if (queue->head == NULL) {
+		queue->head = newlink;
+	}
+	queue->count++;
+	TRACE(("leave enqueue"))
+}