freelist/freelist.c

@@ -6,10 +6,6 @@
 #include <stdlib.h>
 #include <string.h>
 
-struct FreeListBlock {
-    struct FreeListBlock *next;
-};
-
 /* Initialize the FreeList */
 int fl_init(FreeList *fl, uintptr_t start, uintptr_t end, size_t itemsize) {
     size_t size = ALIGN(itemsize);

freelist/freelist.h

@@ -18,7 +18,12 @@ static inline size_t align_up(size_t n) {
 #define ALIGN(x) (align_up(x))
 #endif // FREELIST_NOALIGN
 
-typedef struct FreeListBlock FreeListBlock;
+#define FL_FREE ((uint8_t)0x00)
+#define FL_USED ((uint8_t)0x01)
+
+typedef struct FreeListBlock {
+    struct FreeListBlock *next;
+} FreeListBlock;
 
 typedef struct {
     uintptr_t      start;