output.C File Reference

Go to the source code of this file.

Functions
void	start_output (unsigned int timesteps, std::string filename, std::string varname)

Function Documentation

start_output()

void start_output	(	unsigned int	timesteps,
		std::string	filename,
		std::string	varname
	)

Definition at line 14 of file output.C.

{
  // Truncate then append if we're doing a restart
  if (timesteps)
    {
      std::ifstream infile (filename.c_str());
      char buf[1025];
      libmesh_error_msg_if(!infile.is_open(), "Error opening file " << filename);
 
      // Count off the lines we want to save, including
      // the original header
      for (unsigned int i=0; i != timesteps+1; ++i)
        infile.getline(buf, 1024);
      libmesh_error_msg_if(!infile.good(), "Error reading line from file " << filename);
      unsigned int length = cast_int<unsigned int>(infile.tellg());
      infile.close();
 
      // Then throw away the rest
      int err = truncate(filename.c_str(), length);
      libmesh_error_msg_if(err != 0, "Error truncating file " << filename);
    }
  // Write new headers if we're starting a new simulation
  else
    {
      std::ofstream outfile (filename.c_str(), std::ios_base::out);
      outfile << varname << " = [" << std::endl;
    }
}

References libMesh::err.

Referenced by write_output_headers().