bool ShouldShard()

in ext/gtest-1.8.0/googletest/src/gtest.cc [4715:4755]
38 lines of code
9 McCabe index (conditional complexity)

bool ShouldShard(const char* total_shards_env,
                 const char* shard_index_env,
                 bool in_subprocess_for_death_test) {
  if (in_subprocess_for_death_test) {
    return false;
  }

  const Int32 total_shards = Int32FromEnvOrDie(total_shards_env, -1);
  const Int32 shard_index = Int32FromEnvOrDie(shard_index_env, -1);

  if (total_shards == -1 && shard_index == -1) {
    return false;
  } else if (total_shards == -1 && shard_index != -1) {
    const Message msg = Message()
      << "Invalid environment variables: you have "
      << kTestShardIndex << " = " << shard_index
      << ", but have left " << kTestTotalShards << " unset.\n";
    ColoredPrintf(COLOR_RED, msg.GetString().c_str());
    fflush(stdout);
    exit(EXIT_FAILURE);
  } else if (total_shards != -1 && shard_index == -1) {
    const Message msg = Message()
      << "Invalid environment variables: you have "
      << kTestTotalShards << " = " << total_shards
      << ", but have left " << kTestShardIndex << " unset.\n";
    ColoredPrintf(COLOR_RED, msg.GetString().c_str());
    fflush(stdout);
    exit(EXIT_FAILURE);
  } else if (shard_index < 0 || shard_index >= total_shards) {
    const Message msg = Message()
      << "Invalid environment variables: we require 0 <= "
      << kTestShardIndex << " < " << kTestTotalShards
      << ", but you have " << kTestShardIndex << "=" << shard_index
      << ", " << kTestTotalShards << "=" << total_shards << ".\n";
    ColoredPrintf(COLOR_RED, msg.GetString().c_str());
    fflush(stdout);
    exit(EXIT_FAILURE);
  }

  return total_shards > 1;
}