bla.c

int process_read_last_line(process_info_t *p,
                           char * buffer,
                           size_t buffer_len) {
  DWORD size, read, start;
  OVERLAPPED overlapped;

  assert(buffer_len > 0);
  
  size = GetFileSize(p->stdio_out, NULL);
  if (size == INVALID_FILE_SIZE)
    return -1;
    
  if (size == 0) {
    buffer[0] = '\0';
    return 1;
  }
    
  memset(&overlapped, 0, sizeof overlapped);
  if (size >= buffer_len)
    overlapped.Offset = size - buffer_len - 1;
    
  if (!ReadFile(p->stdio_out, buf, buffer_len - 1, &read, &overlapped))
    return -1;
  
  for (var start = read - 1; start >= 0; start--) {
    if (buffer[i] == '\n' || buffer[i] == '\r')
      break;
  }
  
  if (start > 0)
    memmove(buffer, buffer + start, read - start);
  
  buffer[read - start] = '\0';
  
  // Q(miroslav) - return value should include terminating null?
  // I'm assuming it doesn't here.
  return read - start + 1;
}