malloc_info
struct malloc_info *next;
struct malloc_info *prev;
struct malloc_info DummyInfo = { &DummyInfo, &DummyInfo, NULL, 0, 0 };
struct malloc_info *InfoList = &DummyInfo;
struct malloc_info *info = malloc(sizeof(*info) + bytes);
struct malloc_info *info = (struct malloc_info *)ptr - 1;
struct malloc_info *scan;