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void complain(const char *msg) {
  errno_t err;
  static const char prefix[] = "Error: ";
  static const char suffix[] = "\n";
  char buf[BUFSIZ];

  static_assert(sizeof(buf) > sizeof(prefix), "Buffer for complain() is too small");
  strcpy(buf, prefix);
  if ((err = strcat_s(buf, sizeof(buf), msg)) != 0) {
    /* handle error */
  }
  if ((err = strcat_s(buf, sizeof(buf), suffix)) != 0) {
    /* handle error */
  }
  fputs(buf, stderr);
}