Function vtkTestingGetArgOrEnvOrDefault

Testing/Rendering/vtkTesting.cxx:59–92

------------------------------------------------------------------------------ Find in command tail, failing that find in environment, failing that return a default. Up to caller to delete the string returned.

// failing that return a default.
// Up to caller to delete the string returned.
static string vtkTestingGetArgOrEnvOrDefault(
  const string& argName, // argument idnetifier flag. eg "-D"
  vector<string>& argv,  // command tail
  const string& env,     // environment variable name to find
  const string& def)     // default to use if "env" is not found.
{
  string argValue;

  // Search command tail.
  int argc = static_cast<int>(argv.size());
  for (int i = 0; i < argc; i++)
  {
    if ((i < (argc - 1)) && (argName == argv[i]))
    {
      argValue = argv[i + 1];
    }
  }
  // If not found search environment.
  if (argValue.empty() && !(env.empty() || def.empty()))
  {
    char* foundenv = getenv(env.c_str());
    if (foundenv)
    {
      argValue = foundenv;
    }
    else
    {
      // Not found, fall back to default.
      argValue = def;
    }
  }

  return argValue;
}

//------------------------------------------------------------------------------
// Description: