6 void *__memalign(size_t align, size_t len)
8 unsigned char *mem, *new, *end;
11 if ((align & -align) != align) {
16 if (len > SIZE_MAX - align) {
21 if (align <= 4*sizeof(size_t)) {
22 if (!(mem = malloc(len)))
27 if (!(mem = malloc(len + align-1)))
30 new = (void *)((uintptr_t)mem + align-1 & -align);
31 if (new == mem) return mem;
33 header = ((size_t *)mem)[-1];
36 ((size_t *)new)[-2] = ((size_t *)mem)[-2] + (new-mem);
37 ((size_t *)new)[-1] = ((size_t *)mem)[-1] - (new-mem);
41 end = mem + (header & -8);
42 footer = ((size_t *)end)[-2];
44 ((size_t *)mem)[-1] = header&7 | new-mem;
45 ((size_t *)new)[-2] = footer&7 | new-mem;
46 ((size_t *)new)[-1] = header&7 | end-new;
47 ((size_t *)end)[-2] = footer&7 | end-new;
53 weak_alias(__memalign, memalign);