#include <sys/types.h>#include <unistd.h>#include <string.h> voidbcopy(void *f, void *t, size_t n){	memmove(t, f, n);} intbcmp(void *a, void *b, size_t n){	return memcmp(a, b, n);} voidbzero(void *a, size_t n){	memset(a, 0, n);}