ref: f812d73e86aa308c373e06a170a1b3ba89ad5cb6
dir: /src/libc/stdlib/malloc.h/
#include <stdlib.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 *hp);