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int getlen(const int *input, size_t maxlen, int delim,
           size_t *result) {
  for (size_t i = 0; i < maxlen; ++i) {
    if (input[i] == delim) {
      if (result != NULL) {
        *result = i;
      }
      return 0;
    }
  }
  return -1;
}

void func(int userdata) {
  size_t i;
  int data[] = {1, 1, 1};
  if (getlen(data, sizeof(data), 0, &i) != 0) {
    /* Handle error */
  } else {
    data[i] = userdata;
  }
}