代码

void my_memset(char *a, char c, unsigned n) {
  unsigned i;
  unsigned ed = n / 8 - 1;
  for(i = 0; i < ed; i += 8) {
    a[i] = c;
    a[i+1] = c;
    a[i+2] = c;
    a[i+3] = c;
    a[i+4] = c;
    a[i+5] = c;
    a[i+6] = c;
    a[i+7] = c;
  }
  for (; i < n; i++) a[i] = c;
}

评测结果