@@ -8,8 +8,13 @@
 
 #ifdef __cplusplus
 extern "C" {
 #endif
+
+typedef enum kmcond {
+	kmcond_ok,
+	kmcond_bad_address,
+} kmcond;
 
 typedef enum kmkind {
 	kmkind_none,
 	kmkind_heap,
@@ -28,9 +33,8 @@
 	sz size;
 	kmshred shred;
 	sz refs;
 	struct kmcell* src;
-	char data[];
 } kmcell;
 
 typedef struct kmptr {
 	kmkind kind;
@@ -40,12 +44,12 @@
 } kmptr;
 
 /* heap functions */
 
-void* kmheapa(sz);
-void  kmheapf(void*);
+void*  kmheapa(sz);
+kmcond kmheapf(void*);
 
 #ifdef __cplusplus
 }
 #endif
 
 #endif