init

The-Nook-GamesTM/Proficiencies/queue.c

@@ -0,0 +1,41 @@
+#include "queue.h"
+
+struct queue *enqueue(struct queue *queue, struct expression_element* element) {
+    struct queue *new_elt = calloc(1,sizeof(struct queue));
+
+    new_elt->data = element;
+
+    if(!queue)
+        return new_elt;
+
+    struct queue* current = queue;
+
+    while(current->next)
+        current = current->next;
+
+    current->next = new_elt;
+
+    return queue;
+}
+
+struct expression_element* dequeue(struct queue **queue) {
+    if (!queue || !*queue)
+        return NULL;
+    
+    struct queue* removed = *queue;
+    struct expression_element* res = removed->data;
+
+    *queue = removed->next;
+    free(removed);
+
+    return res;
+}
+
+void queue_destroy(struct queue **queue) {
+    if(!queue)
+        return;
+    while (*queue) {
+        struct expression_element* dequeued = dequeue(queue);
+        free(dequeued);
+    }
+}