/* myheap.h */

void heapinit( int s );
/* initializes the heap from which the following routines
 * allocate memory so that it contains at least s bytes 
 * of free space.
 */      

void * mymalloc( int s );
/* returns a pointer to s consecutive bytes of RAM
 * returns NULL if no RAM is available.
 */      

void myfree( void * p );
/* returns the block of RAM pointed to by p to the
 * heap; the value p must previously have been returned
 * by a call to myalloc() and it must not have already 
 * been freed.
 */