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enum { BLOCK_HEADER_SIZE = 16 };
unsigned long long max = UINT_MAX;

void *AllocateBlock(size_t length) {
  struct memBlock *mBlock;

  if (length + BLOCK_HEADER_SIZE > max) return NULL;
  mBlock 
    = (struct memBlock *)malloc(length + BLOCK_HEADER_SIZE);
  if (!mBlock) return NULL;

  /* fill in block header and return data portion */

  return mBlock;
}

enum { BLOCK_HEADER_SIZE = 16 };
unsigned long long max = UINT_MAX;

void *AllocateBlock(size_t length) {
  struct memBlock *mBlock;

  if ((unsigned long long)length + BLOCK_HEADER_SIZE > max) 
    return NULL;
  mBlock 
    = (struct memBlock *)malloc(length + BLOCK_HEADER_SIZE);
  if (!mBlock) return NULL;

  /* fill in block header and return data portion */

  return mBlock;
}