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cc65/libsrc/common/_heap.h
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758 B
C

/*
* _heap.h
*
* Ullrich von Bassewitz, 03.06.1998
*
*/
#ifndef __HEAP_H
#define __HEAP_H
/* Space needed for administering used blocks */
#define HEAP_ADMIN_SPACE sizeof (unsigned)
/* The data type used to implement the free list.
* Beware: Field order is significant!
*/
struct freeblock {
unsigned size;
struct freeblock* next;
struct freeblock* prev;
};
/* Variables that describe the heap */
extern unsigned* _horg; /* Bottom of heap */
extern unsigned* _hptr; /* Current top */
extern unsigned* _hend; /* Upper limit */
extern struct freeblock* _hfirst; /* First free block in list */
extern struct freeblock* _hlast; /* Last free block in list */
/* End of _heap.h */
#endif