num_to_str
num_to_str(phandle_str, sizeof(phandle_str), np->phandle, 0);
len = num_to_str(m->buf + m->count, m->size - m->count, num, width);
len = num_to_str(m->buf + m->count, m->size - m->count, num, 0);
int num_to_str(char *buf, int size, unsigned long long num, unsigned int width);
return print(num_to_str(num, num_buf, sizeof(num_buf)));