Assignment about professionally Programming a library

Assignment1/dll.c

@@ -0,0 +1,40 @@
+#include "dll.h"
+#include <memory.h>
+#include <stdlib.h>
+
+/* Public Function Implementation to create and return
+ * new empty doubly linked list*/
+
+dll_t *
+get_new_dll(){
+
+    dll_t *dll = calloc(1, sizeof(dll_t));
+    dll->head = NULL;
+    return dll;
+}
+
+/* Public Function Implementation to add a new application
+ *  * data to DLL */
+int
+add_data_to_dll (dll_t *dll, void *app_data){
+
+    if(!dll || !app_data) return -1;
+    
+    dll_node_t *dll_new_node = calloc(1, sizeof(dll_node_t));
+    dll_new_node->left = NULL;
+    dll_new_node->right = NULL;
+    dll_new_node->data = app_data;
+
+    /*Now add this to the front of DLL*/
+    if(!dll->head){
+        dll->head = dll_new_node;
+        return 0;
+    }
+
+    dll_node_t *first_node = dll->head;
+    dll_new_node->right = first_node;
+    first_node->left = dll_new_node;
+    dll->head = dll_new_node;
+    return 0;
+}
+