#include <stddef.h>

void keke_swap(void *a, void *b, size_t size) {
	if(a == b) return;
	size_t i = 0;
	int *ia = a;
	int *ib = b;
	for(i = 0; i < (size / sizeof(int)); ++i) {
		ia[i] ^= ib[i];
		ib[i] ^= ia[i];
		ia[i] ^= ib[i];
	}
	size %= sizeof(int);
	char *aa = a + (i * sizeof(int));
	char *bb = b + (i * sizeof(int));
	for(i = 0; i < size; i++) {
		aa[i] ^= bb[i];
		bb[i] ^= aa[i];
		aa[i] ^= bb[i];
	}
}

size_t bit_ceil(size_t	s) {
    size_t t = 1;
    while(t < s) t <<= 1;
    return t;
}