Function read_input

src/csplit.c:256–274

   Return the number of bytes read. */

static idx_t
read_input (char *dest, idx_t max_n_bytes)
{
  if (max_n_bytes == 0)
    return 0;

  ptrdiff_t bytes_read = safe_read (STDIN_FILENO, dest, max_n_bytes);

  if (bytes_read == 0)
    have_read_eof = true;

  if (bytes_read < 0)
    {
      error (0, errno, _("read error"));
      cleanup_fatal ();
    }

  return bytes_read;
}

/* Initialize existing line record P. */