6 void __internal_free(void *);
8 void *__memalign(size_t align, size_t len)
10 unsigned char *mem, *new, *end;
11 size_t header, footer;
13 if ((align & -align) != align) {
18 if (len > SIZE_MAX - align || free != __internal_free) {
23 if (align <= 4*sizeof(size_t)) {
24 if (!(mem = malloc(len)))
29 if (!(mem = malloc(len + align-1)))
32 new = (void *)((uintptr_t)mem + align-1 & -align);
33 if (new == mem) return mem;
35 header = ((size_t *)mem)[-1];
38 ((size_t *)new)[-2] = ((size_t *)mem)[-2] + (new-mem);
39 ((size_t *)new)[-1] = ((size_t *)mem)[-1] - (new-mem);
43 end = mem + (header & -8);
44 footer = ((size_t *)end)[-2];
46 ((size_t *)mem)[-1] = header&7 | new-mem;
47 ((size_t *)new)[-2] = footer&7 | new-mem;
48 ((size_t *)new)[-1] = header&7 | end-new;
49 ((size_t *)end)[-2] = footer&7 | end-new;
55 weak_alias(__memalign, memalign);