Thread: 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.