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extern int foo (void);

int

avi_parse_comments (int fd, char *buf, int space_left)

{

  int len = 0, readlen = 0, k;

  char *data, *c, *d;

  if (fd <= 0 || !buf || space_left <= 0)

    return -1;

  memset (buf, 0, space_left);

  readlen = foo ();

  if (!(data = malloc (readlen * sizeof (char) + 1)))

    return -1;

  c = data;

  space_left--;

  while (len < space_left)

    {

      if (!c || *c == '\0')

        break;

      else if (*c == 'I')

        {

          d = c + 4;

          k = 0;

          while (d[k] != '\r' && d[k] != '\n' && d[k] != '\0')

            ++k;

          if (k >= space_left)

            return len;

          memcpy (buf + len, c, 4);

          len += 4;

          long2str (buf + len, k + 1);

          len += 4;

          memcpy (buf + len, d, k);

          *(buf + len + k + 1) = '\0';

          if ((k + 1) & 1)

            {

              k++;

              *(buf + len + k + 1) = '\0';

            }

          len += k + 1;

          while (*c != '\n' && *c != '\0')

            ++c;

          if (*c != '\0')

            ++c;

          else

            break;

        }

    }

  free (data);

  return len;

}