ref: e43e3872b43d9c1b49e9e5c015b32258c3735ad8
dir: /src/libc/stdlib/malloc.h/
/* minimum amount of required units */
#define NALLOC 16
typedef union header Header;
union header {
struct hdr {
Header *next;
size_t size;
} h;
/* most restrictive type fixes the union size for alignment */
_ALIGNTYPE most;
};
extern void *_prevchunk(Header *);