Class stat

src/wc.c:898–898

      /* Read the file list into RAM if we can detect its size and that
         size is reasonable.  Otherwise, we'll read a name at a time.  */
      struct stat st;
      if (fstat (fileno (stream), &st) == 0
          && S_ISREG (st.st_mode)
          && st.st_size <= MIN (10 * 1024 * 1024, physmem_available () / 2))