add some more code

lib/tinyptr-alloc/src/lib.rs

@@ -1,6 +1,6 @@
 #![no_std]
 
-use tinyptr::ptr::MutPtr;
+use tinyptr::ptr::{MutPtr, NonNull};
 
 #[derive(Copy, Clone, Debug, PartialEq, Eq)]
 pub struct ListNode<const BASE: usize> {
@@ -8,3 +8,22 @@ pub struct ListNode<const BASE: usize> {
     pub size: u16
 }
 
+impl<const BASE: usize> ListNode<BASE> {
+    pub unsafe fn next(&mut self) -> Option<&mut Self> {
+        if self.next.is_null() {
+            None
+        } else {
+            Some(&mut *(self.next.wide()))
+        }
+    }
+    pub unsafe fn link_next(&mut self, block: NonNull<Self, BASE>) {
+        (*block.as_ptr().wide()).next = self.next;
+        self.next = block.as_ptr();
+    }
+    pub unsafe fn unlink_next(&mut self) {
+        if self.next.is_null() {
+            return;
+        }
+        self.next = (*self.next.wide()).next;
+    }
+}