Function cwrite

src/split.c:681–703

   Return true if successful.  */

static bool
cwrite (bool new_file_flag, char const *bp, idx_t bytes)
{
  if (new_file_flag)
    {
      if (!bp && bytes == 0 && elide_empty_files)
        return true;
      closeout (NULL, output_desc, filter_pid, outfile);
      next_file_name ();
      output_desc = create (outfile);
      if (output_desc < 0)
        error (EXIT_FAILURE, errno, "%s", quotef (outfile));
    }

  if (full_write (output_desc, bp, bytes) == bytes)
    return true;
  else
    {
      if (! ignorable (errno))
        error (EXIT_FAILURE, errno, "%s", quotef (outfile));
      return false;
    }
}

/* Split into pieces of exactly N_BYTES bytes.
   However, the first REM_BYTES pieces should be 1 byte longer.