error on in algorithim

Code:

struct block { int size; struct block *next; char data[1]; }; struct heap { int max; struct block *free[1]; }; struct block *GetBlock(int size, struct heap *hPtr); struct block *GetFree(struct block *addr, struct heap *hPtr, int size); void FreeBlock(struct block *bPtr, struct heap *hPtr); int main() { return 0; } struct block *GetBlock(int size, struct heap *hPtr) { struct block *ret; if (ret = hPtr->free[size]) { hPtr->free[size] = hPtr->free[size]->next; } else if (size < hPtr->max) { if(ret = GetFlock(size + 1, hPtr)) { struct block *bPtr = (struct block *)((char *)ret + (1 << size)); bPtr->next = hPtr->free[size]; hPtr->free[size] = bPtr; } } return ret; } struct block *GetFree(struct block *addr, struct heap *hPtr, int size) { struct block *prev = &(hPtr->free[size - 1]); // HACK! struct block *current = hPtr->free[size]; while (current) { if (current == addr) { break; } prev = current; current = current->next; } if (current) { prev->next = current->next; } return current; } void FreeBlock(struct block *bPtr, struct heap *hPtr) { int size = bPtr->size; while (size < hPtr->max) { unsigned long mask = 1 << size; unsigned long bit = bPtr & mask; struct block *base = (struct block *)((unsigned long)bPtr & ~mask); struct block *buddy = (struct block *)((unsigned long)base | (~bit & mask)); if (GetFree(buddy, hPtr, size)) { size = base->size++; bPtr = base; } } bPtr->next = hPtr->free[size]; hPtr->free[size] = bPtr; }

just testing to see if this algorithim works under unix using cc compiler. get the following error when i try to run: test.c:60: error: invalid operands to binary & . It is the following line: unsigned long bit = bPtr & mask; Also, the unsigned long decleration used to be DWORD, which does not work under unix.