Updated free list interface

I realized my existing interface wouldn't work
if the coalescing or adding of a new node replaced
the head of the list, as there was no way to
communicate that back to the caller. As a result,
I've updated those interfaces to accept a pointer
to the free list head pointer. This will let them
change the free list head in alloc.c if necessary.

1 files changed, 27 insertions, 0 deletions

diff --git a/include/alloc_header.h b/include/alloc_header.h
new file mode 100644
index 0000000..bf4716c
--- /dev/null
+++ b/include/alloc_header.h
@@ -0,0 +1,27 @@
+/*
+ * include/alloc_header.h
+ *
+ * liballoc memory block header type.
+ * CISC 301 -- Operating Systems, Project 3
+ *
+ * Copyright (C) 2025  Douglas B. Rumbaugh <dbrumbaugh@harrisburgu.edu>
+ * 
+ * Distributed under the Modified BSD License
+ *
+ */
+#ifndef H_LIBALLOC_HEADER
+#define H_LIBALLOC_HEADER
+
+#include <stdlib.h>
+#include <assert.h>
+
+#include "constants.h"
+
+typedef struct header {
+  size_t size;
+  size_t magic_number;
+} header;
+
+static_assert(sizeof(header) % ALIGNMENT == 0, "Header improperly aligned");
+
+#endif