ListSpace.c

// Allocate memory for maximum ListItems space = calloc(MAXITEMS*3, sizeof(int)); printf("%d bytes of memory allocated\n", MAXITEMS*3*sizeof(int));

// Create a new listItem in the space and return its index int listInsert() { //printf("listInsert(): new item %d\n", items); return items++; }

// Start at subject listItem and traverse the object as an association to a new listItem // - object is also a listItem reference and its binary address is used as the traversal path // - subject and object (all list-item references are ints starting at item 0) int listTraverse(int subject, int object) { object += 2; // tmp: can't traverse items 0 or 1 int i; for ( i = 1; i <= object >> 1; i <<= 1 ) { int *addr = space + subject * 3 + (object & i ? 1 : 0); subject = *addr ? *addr : (*addr = listInsert()); } return subject; }

// Get the value (payload key) of the subject Item int listGetValue(int subject) { int *addr = space + subject * 3 + 2; return *addr; }

// Set the payload key of the subject Item to the passed value void listSetValue(int subject, int value) { int *addr = space + subject * 3 + 2; *addr = value; }