updated list lib

list_movers.c

@@ -0,0 +1,40 @@
+#include <list.h>
+#include <stddef.h>
+
+int ListCount(LIST *list) {  
+  return (int) list->size;
+}
+
+void *ListFirst(LIST *list) {
+  list->current = list->head;
+  return list->current->data;
+}
+
+void *ListLast(LIST *list) {
+  list->current = list->tail;
+  return list->current->data;
+}
+
+void *ListNext(LIST *list) {
+  if (list->current->next != NULL) {
+    list->current = list->current->next;
+    return list->current->data;
+  }
+  return NULL;
+}
+
+void *ListPrev(LIST *list) {
+  if (list->current->next != NULL) {
+    list->current = list->current->previous;
+    return list->current->data;
+  }
+  return NULL;
+}
+
+void *ListCurr(LIST *list) {
+  if (list->current != NULL) {
+    return list->current->data;
+  }
+  return NULL;
+}
+