7 static size_t mal0_clear(char *p, size_t n)
9 const size_t pagesz = 4096; /* arbitrary */
10 if (n < pagesz) return n;
12 typedef uint64_t __attribute__((__may_alias__)) T;
14 typedef unsigned char T;
17 size_t i = (uintptr_t)pp & (pagesz - 1);
19 pp = memset(pp - i, 0, i);
20 if (pp - p < pagesz) return pp - p;
21 for (i = pagesz; i; i -= 2*sizeof(T), pp -= 2*sizeof(T))
22 if (((T *)pp)[-1] | ((T *)pp)[-2])
27 static int allzerop(void *p)
31 weak_alias(allzerop, __malloc_allzerop);
33 void *calloc(size_t m, size_t n)
35 if (n && m > (size_t)-1/n) {
41 if (!p || (!__malloc_replaced && __malloc_allzerop(p)))
44 return memset(p, 0, n);