Function GetIndexArg

Source/cmListCommand.cxx:31–58

namespace {

bool GetIndexArg(std::string const& arg, int* idx, cmMakefile& mf)
{
  long value;
  if (!cmStrToLong(arg, &value)) {
    switch (mf.GetPolicyStatus(cmPolicies::CMP0121)) {
      case cmPolicies::WARN: {
        // Default is to warn and use old behavior OLD behavior is to allow
        // compatibility, so issue a warning and use the previous behavior.
        std::string warn =
          cmStrCat(cmPolicies::GetPolicyWarning(cmPolicies::CMP0121),
                   " Invalid list index \"", arg, "\".");
        mf.IssueMessage(MessageType::AUTHOR_WARNING, warn);
        CM_FALLTHROUGH;
      }
      case cmPolicies::OLD:
        // OLD behavior is to allow compatibility, so just ignore the
        // situation.
        break;
      case cmPolicies::NEW:
        return false;
    }
  }

  // Truncation is happening here, but it had always been happening here.
  *idx = static_cast<int>(value);

  return true;
}

bool GetListString(std::string& listString, std::string const& var,
                   cmMakefile const& makefile)