meshid.C File Reference

Go to the source code of this file.

Functions
void	handle_error (int error, std::string message)
void	usage_error (const char *progname)
void	gen_random_string (std::string &s, const int len)
int	main (int argc, char **argv)

Function Documentation

gen_random_string()

void gen_random_string	(	std::string &	s,
		const int	len
	)

Definition at line 246 of file meshid.C.

Referenced by main().

{
  static const char alphanum[] =
    "0123456789"
    "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
    "abcdefghijklmnopqrstuvwxyz";

  // Seed the random number generator with the current time
  srand( static_cast<unsigned>(time(nullptr)) );

  s.resize(len);
  for (int i = 0; i < len; ++i)
    {
      unsigned int alphai = static_cast<unsigned int>
        (rand() / (RAND_MAX+1.0) * (sizeof(alphanum)-1));
      s[i] = alphanum[alphai];
    }
}

handle_error()

void handle_error	(	int	error,
		std::string	message
	)

Definition at line 226 of file meshid.C.

Referenced by main().

{
  std::cout << "Error " << error << " occurred while working with the netCDF API" << std::endl;
  std::cout << message << std::endl;

  exit(1);
}

main()

int main	(	int	argc,
		char **	argv
	)

Definition at line 55 of file meshid.C.

References gen_random_string(), handle_error(), libMesh::Trees::NODES, and usage_error().

{
  GetPot cl(argc, argv);

  // Command line parsing
  if (!cl.search("--input"))
    {
      std::cerr << "No --input argument found!" << std::endl;
      usage_error(argv[0]);
    }
  const char * meshname = cl.next("");

  if (!cl.search("--oldid"))
    {
      std::cerr << "No --oldid argument found!" << std::endl;
      usage_error(argv[0]);
    }
  long oldid = cl.next(0);

  if (!cl.search("--newid"))
    {
      std::cerr << "No --newid argument found!" << std::endl;
      usage_error(argv[0]);
    }
  long newid = cl.next(0);

  unsigned char flags = 0;
  if (cl.search("--nodesetonly"))
    flags |= NODES;
  if (cl.search("--sidesetonly"))
    flags |= SIDES;
  if (cl.search("--blockonly"))
    flags |= BLOCKS;
  if (cl.search("--dim"))
    flags |= EXODUS_DIM;

  // No command line flags were set, turn on NODES, SIDES, and BLOCKS
  if (!flags)
    flags = NODES | SIDES | BLOCKS; // ALL except EXODUS_DIM on

  // flags are exclusive
  if (flags != NODES &&
      flags != SIDES &&
      flags != BLOCKS &&
      flags != EXODUS_DIM &&
      flags != (NODES | SIDES | BLOCKS))
    {
      std::cerr << "Only one of the following options may be active [--nodesetonly | --sidesetonly | --blockonly | --dim]!" << std::endl;
      usage_error(argv[0]);
    }

  // Processing
  std::string var_name, dim_name;
  int status;
  int nc_id, var_id, dim_id;
  size_t dim_len;

  status = nc_open (meshname, NC_WRITE, &nc_id);
  if (status != NC_NOERR) handle_error(status, "Error while opening file.");

  for (unsigned char mask = 8; mask; mask/=2)
    {
      // These are char *'s #defined in exodusII_int.h
      switch (flags & mask)
        {
        case BLOCKS:
          dim_name = DIM_NUM_EL_BLK;
          var_name = VAR_ID_EL_BLK;
          break;
        case SIDES:
          dim_name = DIM_NUM_SS;
          var_name = VAR_SS_IDS;
          break;
        case NODES:
          dim_name = DIM_NUM_NS;
          var_name = VAR_NS_IDS;
          break;
        case EXODUS_DIM:
          dim_name = DIM_NUM_DIM;
          // var_name not used for setting dimension
          break;
        default:
          // We don't match this flag, so go to the next mask
          continue;
        }

      // Get the ID and length of the variable in question - stored in a dimension field
      status = nc_inq_dimid (nc_id, dim_name.c_str(), &dim_id);
      if (status != NC_NOERR) handle_error(status, "Error while inquiring about a dimension's ID.");

      status = nc_inq_dimlen (nc_id, dim_id, &dim_len);
      if (status != NC_NOERR) handle_error(status, "Error while inquiring about a dimension's length.");

      if ((flags & mask) != EXODUS_DIM)
        {
          // Now get the variable values themselves
          std::vector<long> var_vals(dim_len);

          status = nc_inq_varid (nc_id, var_name.c_str(), &var_id);
          if (status != NC_NOERR) handle_error(status, "Error while inquiring about a variable's ID.");

          status = nc_get_var_long (nc_id, var_id, var_vals.data());
          if (status != NC_NOERR) handle_error(status, "Error while retrieving a variable's values.");

          // Update the variable value specified on the command line
          for (unsigned int i=0; i<dim_len; ++i)
            if (var_vals[i] == oldid)
              var_vals[i] = newid;

          // Save that value back to the NetCDF database
          status = nc_put_var_long (nc_id, var_id, var_vals.data());
          if (status != NC_NOERR) handle_error(status, "Error while writing a variable's values.");
        }

      // Redefine the dimension
      else
        {
          // The value stored in dim_len is actually the dimension?
          if (dim_len == (size_t)oldid)
            {
              // Trying to change def's always raises
              // Error -38: /* Operation not allowed in data mode */
              // unless you are in "define" mode.  So let's go there now.

              // Try to put the file into define mode
              status = nc_redef(nc_id);
              if (status != NC_NOERR) handle_error(status, "Error while putting file into define mode.");

              // Rename the "num_dim" dimension.  Note: this will fail if there is already a dimension
              // which has the name you are trying to use.  This can happen, for example if you have already
              // changed the dimension of this exodus file once using this very script.  There appears
              // to be no way to delete a dimension using basic NetCDF interfaces, so to workaround this
              // we just rename it to an arbitrary unique string that Exodus will ignore.

              // Construct a string with 6 random alpha-numeric characters at the end.
              std::string random_dim_name;
              gen_random_string(random_dim_name, 6);
              random_dim_name = std::string("ignored_num_dim_") + random_dim_name;

              // Rename the old dimension variable to our randomly-chosen name
              status = nc_rename_dim(nc_id, dim_id, random_dim_name.c_str());
              if (status != NC_NOERR) handle_error(status, "Error while trying to rename num_dim.");

              // Now define a new "num_dim" value of newid
              int dummy=0;
              status = nc_def_dim (nc_id, dim_name.c_str(), newid, &dummy);
              if (status != NC_NOERR) handle_error(status, "Error while trying to define num_dim.");

              // Leave define mode
              status = nc_enddef(nc_id);
              if (status != NC_NOERR) handle_error(status, "Error while leaving define mode.");
            }
        }
    } // end for

  // Write out the dataset
  status = nc_close(nc_id);

  return (status != NC_NOERR);
}

usage_error()

void usage_error

(

const char *

progname

)

Definition at line 236 of file meshid.C.

Referenced by main().

{
  std::cout << "Usage: " << progname
            << " --input inputmesh --oldid <n> --newid <n> [--nodesetonly | --sidesetonly | --blockonly]"
            << std::endl;
  exit(1);
}