Initial upload

ptr_stack.h

@@ -0,0 +1,31 @@
+/* vim: set filetype=c: */
+
+#ifndef _PTR_STACK_H_
+#define _PTR_STACK_H_
+
+#include <stddef.h>
+
+/* THIS STRUCT IS ONLY FOR HOLDING POINTERS AS REFERENCES, NOT 
+ * HEAP ALLOCATED OBJECTS. IT DOES NOT AUTOMATICALLY ALLOC OR FREE
+ * ANYTHING BUT INTERNAL OBJECTS. */
+
+typedef struct PtrStackItem PtrStackItem;
+struct PtrStackItem {
+    PtrStackItem* prev;
+    void* ptr;
+};
+
+typedef struct PtrStack PtrStack;
+struct PtrStack {
+    PtrStackItem* top;
+    size_t size;
+};
+
+extern void PtrStack_init(PtrStack* obj);
+
+extern void PtrStack_push(PtrStack* obj, void* ptr);
+extern void PtrStack_pop(PtrStack* obj);
+
+extern void PtrStack_uninit(PtrStack* obj);
+
+#endif /* _PTR_STACK_H_ */