Function cut_bytes

src/cut.c:799–859

   callers to hand off mid-line.  */

static void
cut_bytes (FILE *stream)
{
  static char bytes_in[IO_BUFSIZE];
  uintmax_t byte_idx = 0;
  bool print_delimiter = false;
  int fd = fileno (stream);

  current_rp = frp;

  while (true)
    {
      idx_t available = read (fd, bytes_in, sizeof bytes_in);
      if (available <= 0)
        {
          if (available < 0)
            fseterr (stream);
          write_pending_line_delim (byte_idx);
          break;
        }

      idx_t processed = 0;

      while (processed < available)
        {
          char *line = bytes_in + processed;
          idx_t to_process = available - processed;
          char *line_end = search_bytes (line, line_delim, to_process);
          char *end = line + (line_end ? line_end - line : to_process);
          char *p = line;

          while (0 < end - p)
            {
              sync_byte_selection (byte_idx);

              if (byte_idx + 1 < current_rp->lo)
                {
                  idx_t skip = MIN (end - p, current_rp->lo - (byte_idx + 1));
                  p += skip;
                  byte_idx += skip;
                }
              else
                {
                  idx_t n = MIN (end - p, current_rp->hi - byte_idx);
                  write_selected_item (&print_delimiter,
                                       is_range_start_index (byte_idx + 1),
                                       p, n);
                  p += n;
                  byte_idx += n;
                }
            }

          processed += end - line;
          if (line_end)
            {
              processed++;
              reset_item_line (&byte_idx, &print_delimiter);
            }