/*
 * Copyright (c) 2005 Sandia Corporation. Under the terms of Contract
 * DE-AC04-94AL85000 with Sandia Corporation, the U.S. Governement
 * retains certain rights in this software.
 * 
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are
 * met:
 * 
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 * 
 *     * Redistributions in binary form must reproduce the above
 *       copyright notice, this list of conditions and the following
 *       disclaimer in the documentation and/or other materials provided
 *       with the distribution.  
 * 
 *     * Neither the name of Sandia Corporation nor the names of its
 *       contributors may be used to endorse or promote products derived
 *       from this software without specific prior written permission.
 * 
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 * 
 */
/*****************************************************************************
*
* excn2s - ex_cvt_nodes_to_sides: convert nodes to sides
*
* entry conditions - 
*   input parameters:
*       int     exoid                   exodus file id
*       int     *num_elem_per_set       number of element per set
*       int     *num_nodes_per_set      number of nodes per set
*       int     *side_sets_elem_index   index array of elements into elem list
*       int     *side_sets_node_index   index array of nodes
*       int     *side_sets_elem_list    array of elements
*       int     *side_sets_node_list    array of nodes
*
* exit conditions - 
*       int     *side_sets_side_list    array of sides/faces
*
* revision history - 
*
*  Id
*
*****************************************************************************/

#include <ctype.h>
#include <string.h>
#include <stdlib.h>
#include "exodusII.h"
#include "exodusII_int.h"

/*!
 * This routine is designed to take the results from retrieving the ExodusI
 * style concatenated side sets to the Exodus II V 2.0 definition
 * uses the element id to get the  coordinate node list,  element block
 * connectivity, element type to
 * convert the side set node list to a side/face list. 

 *  \param    exoid                   exodus file id
 *  \param    *num_elem_per_set       number of element per set
 *  \param    *num_nodes_per_set      number of nodes per set
 *  \param    *side_sets_elem_index   index array of elements into elem list
 *  \param    *side_sets_node_index   index array of nodes
 *  \param    *side_sets_elem_list    array of elements
 *  \param    *side_sets_node_list    array of nodes
 *  \param[out]    *side_sets_side_list    array of sides/faces

 <b>Algorithm:</b>

\verbatim
  Read elem_block_ids --> elem_blk_id[array]

  Read element block parameters --> elem_blk_parms[array]

  Determine total number of elements in side set by summing num_elem_per_set

  Build side set element to side set node list index --> ss_elem_node_ndx[array]

  For each element in the side_set_elem_list  {
    If Jth element is not in current element block (e.g. J>elem_ctr) {
      get element block parameters (num_elem_in_blk, ...)
      elem_ctr += num_elem_in_blk

      free old connectity array space 
      allocate connectivity array: size=num_elem_in_blk*num_nodes_per_elem
      get connectivity array
    }

    If Jth element is in current element block (e.g. J<=elem_ctr) {
      For each node in element (linear search of up to num_nodes_per_elem) {
        If side set element node[1] == element node[i] {
          Case element type = Hex {
            If side set element node[2] == element node[Hex_table[i,1]]
              Jth side = Hex_table[i,2]

             break
          }
          Case element type = Wedge {
            If side set element node[2] == element node[Wedge_table[i,1]]
              Jth side = Wedge_table[i,2]

            break
          }
        }
      }
    }
  }
\endverbatim

 */

int ex_cvt_nodes_to_sides(int exoid,
                          int *num_elem_per_set,
                          int *num_nodes_per_set,
                          int * side_sets_elem_index, /* unused */ 
                          int * side_sets_node_index, /* unused */
                          int *side_sets_elem_list,
                          int *side_sets_node_list,
                          int *side_sets_side_list)
{
  size_t m;
  int i, j, k, n;
  int  num_side_sets, num_elem_blks;
  int tot_num_elem = 0, tot_num_ss_elem = 0, elem_num = 0, ndim;
  int *elem_blk_ids, *connect;
  int *ss_elem_ndx, *ss_elem_node_ndx, *ss_parm_ndx;
  int elem_ctr, node_ctr, elem_num_pos;
  int num_elem_in_blk, num_nodes_per_elem, num_node_per_side, num_attr;
  int *same_elem_type, el_type;
  float fdum;
  char *cdum, elem_type[MAX_STR_LENGTH+1];

  struct elem_blk_parm  *elem_blk_parms;

/* node to side translation tables - 
     These tables are used to look up the side number based on the
     first and second node in the side/face list. The side node order
     is found in the original Exodus document, SAND87-2997. The element
     node order is found in the ExodusII document, SAND92-2137. These
     tables were generated by following the right-hand rule for determining
     the outward normal. Note: Only the more complex 3-D shapes require
     these tables, the simple shapes are trivial - the first node found
     is also the side number.
*/

  /*    1     2   3    4                                          node 1 */
  static int shell_table[2][8]  = {
      {2,4, 3,1, 4,2, 1,3},                                    /* node 2 */
      {1,2, 1,2, 1,2, 1,2}                                     /* side # */
  };

  /*    1     2   3    4                                          node 1 */
  static int shell_edge_table[2][8]  = {
      {2,4, 3,1, 4,2, 1,3},                                    /* node 2 */
      {3,6, 4,3, 5,4, 6,5}                                     /* side # */
  };

  /*    1     2   3                                               node 1 */
  static int trishell_table[2][6]  = {
      {2,3, 3,1, 1,2},                                         /* node 2 */
      {1,2, 1,2, 1,2}                                          /* side # */
  };

  /*     1      2      3      4                                   node 1 */
  static int tetra_table[2][12]  = {
      {2,3,4, 1,3,4, 4,1,2, 1,2,3},                            /* node 2 */
      {1,4,3, 4,2,1, 2,3,4, 1,2,3}                             /* side # */
  };

#if 0
  static int wedge_table[2][18]  = {
  /*     1      2      3      4      5      6                     node 1 */
      {2,4,3, 5,1,3, 6,1,2, 1,6,5, 6,2,4, 4,3,5},              /* node 2 */
      {1,3,4, 1,4,2, 2,3,4, 1,3,5, 5,2,1, 5,3,2}               /* side # */
  };
#endif
  
  static int hex_table[2][24]  = {
  /*     1      2      3      4      5      6      7      8       node 1 */
      {4,2,5, 1,3,6, 7,4,2, 3,1,8, 6,8,1, 5,2,7, 8,6,3, 7,5,4},/* node 2 */
      {5,1,4, 5,2,1, 2,3,5, 5,4,3, 6,4,1, 1,2,6, 6,2,3, 3,6,4} /* side # */
  };

  char errmsg[MAX_ERR_LENGTH];

  (void)side_sets_elem_index;
  (void)side_sets_node_index;

  exerrval = 0; /* clear error code */

  cdum = 0; /* initialize even though it is not used */

/* first check if any side sets are specified */
/* inquire how many side sets have been stored */

  if ((ex_inquire(exoid, EX_INQ_SIDE_SETS, &num_side_sets, &fdum, cdum)) == -1)
  {
    sprintf(errmsg,
           "Error: failed to get number of side sets in file id %d",exoid);
    ex_err("ex_cvt_nodes_to_sides",errmsg,exerrval);
    return(EX_FATAL);
  }

  if (num_side_sets == 0)
  {
    sprintf(errmsg,
           "Warning: no side sets defined in file id %d",exoid);
    ex_err("ex_cvt_nodes_to_sides",errmsg,EX_WARN);
    return(EX_WARN);
  }

  if ((ex_inquire(exoid, EX_INQ_ELEM_BLK, &num_elem_blks, &fdum, cdum)) == -1)
  {
    sprintf(errmsg,
           "Error: failed to get number of element blocks in file id %d",exoid);
    ex_err("ex_cvt_nodes_to_sides",errmsg,exerrval);
    return(EX_FATAL);
  }

  if ((ex_inquire(exoid, EX_INQ_ELEM, &tot_num_elem, &fdum, cdum)) == -1)
  {
    sprintf(errmsg,
           "Error: failed to get total number of elements in file id %d",exoid);
    ex_err("ex_cvt_nodes_to_sides",errmsg,exerrval);
    return(EX_FATAL);
  }

/* get the dimensionality of the coordinates;  this is necessary to
   distinguish between 2d TRIs and 3d TRIs */

  if ((ex_inquire(exoid, EX_INQ_DIM, &ndim, &fdum, cdum)) == -1)
  {
    sprintf(errmsg,
           "Error: failed to get dimensionality in file id %d",exoid);
    ex_err("ex_cvt_nodes_to_sides",errmsg,exerrval);
    return(EX_FATAL);
  }

  /* First count up # of elements in the side sets*/
  for (i=0;i<num_side_sets;i++)
    tot_num_ss_elem += num_elem_per_set[i];

  /* Allocate space for the ss element index array */
  if (!(ss_elem_ndx=malloc(tot_num_ss_elem*sizeof(int))))
  {
    exerrval = EX_MEMFAIL;
    sprintf(errmsg,
 "Error: failed to allocate space for side set elem sort array for file id %d",
            exoid);
    ex_err("ex_cvt_nodes_to_sides",errmsg,exerrval);
    return (EX_FATAL);
  }

  /* Sort side set element list into index array  - non-destructive */
  for (i=0;i<tot_num_ss_elem;i++)
    ss_elem_ndx[i] = i; /* init index array to current position */

  ex_iqsort(side_sets_elem_list, ss_elem_ndx,tot_num_ss_elem);


  /* Allocate space for the element block ids */
  if (!(elem_blk_ids=malloc(num_elem_blks*sizeof(int))))
  {
    free(ss_elem_ndx);
    exerrval = EX_MEMFAIL;
    sprintf(errmsg,
        "Error: failed to allocate space for element block ids for file id %d",
            exoid);
    ex_err("ex_cvt_nodes_to_sides",errmsg,exerrval);
    return (EX_FATAL);
  }

  if (ex_get_elem_blk_ids(exoid, elem_blk_ids))
  {
    free(elem_blk_ids);
    free(ss_elem_ndx);
    sprintf(errmsg,
           "Error: failed to get element block ids in file id %d",
            exoid);
    ex_err("ex_cvt_nodes_to_sides",errmsg,EX_MSG);
    return(EX_FATAL);
  } 

  /* Allocate space for the element block params */
  if (!(elem_blk_parms=malloc(num_elem_blks*sizeof(struct elem_blk_parm))))
  {
    free(elem_blk_ids);
    free(ss_elem_ndx);
    exerrval = EX_MEMFAIL;
    sprintf(errmsg,
      "Error: failed to allocate space for element block params for file id %d",
            exoid);
    ex_err("ex_cvt_nodes_to_sides",errmsg,exerrval);
    return (EX_FATAL);
  }
  elem_ctr = 0;
  for (i=0; i<num_elem_blks; i++)
  {
    /* read in an element block parameter */
    if ((ex_get_elem_block (exoid,
                            elem_blk_ids[i],
                            elem_type,
                            &num_elem_in_blk,
                            &num_nodes_per_elem,
                            &num_attr)) == -1)
    {
      free(elem_blk_parms);
      free(elem_blk_ids);
      free(ss_elem_ndx);
      sprintf(errmsg,
             "Error: failed to get element block %d parameters in file id %d",
              elem_blk_ids[i], exoid);
      ex_err("ex_cvt_nodes_to_sides",errmsg,EX_MSG);
      return(EX_FATAL);
    }

    elem_blk_parms[i].num_elem_in_blk = num_elem_in_blk;
    elem_blk_parms[i].num_nodes_per_elem = num_nodes_per_elem;
    elem_blk_parms[i].num_attr = num_attr;

    for (m=0; m < strlen(elem_type); m++)
      elem_blk_parms[i].elem_type[m] = 
              (char)toupper(elem_type[m]);
    elem_blk_parms[i].elem_type[m] = '\0';

    if (strncmp(elem_blk_parms[i].elem_type,"CIRCLE",3) == 0)
    {
      elem_blk_parms[i].elem_type_val = EX_EL_CIRCLE;
      /* set side set node stride */
        elem_blk_parms[i].num_nodes_per_side[0] = 1;
    }
    else if (strncmp(elem_blk_parms[i].elem_type,"SPHERE",3) == 0)
    {
      elem_blk_parms[i].elem_type_val = EX_EL_SPHERE;
      /* set side set node stride */
        elem_blk_parms[i].num_nodes_per_side[0] = 1;
    }
    else if (strncmp(elem_blk_parms[i].elem_type,"QUAD",3) == 0)
    {
      elem_blk_parms[i].elem_type_val = EX_EL_QUAD;
      /* determine side set node stride */
      if (elem_blk_parms[i].num_nodes_per_elem == 4)
        elem_blk_parms[i].num_nodes_per_side[0] = 2;
      else if (elem_blk_parms[i].num_nodes_per_elem == 5)
        elem_blk_parms[i].num_nodes_per_side[0] = 2;
      else 
        elem_blk_parms[i].num_nodes_per_side[0] = 3;
    }
    else if (strncmp(elem_blk_parms[i].elem_type,"TRIANGLE",3) == 0)
    {
      elem_blk_parms[i].elem_type_val = EX_EL_TRIANGLE;
      /* determine side set node stride */
      if (ndim == 2)  /* 2d TRIs */
      {
        if (elem_blk_parms[i].num_nodes_per_elem == 3)
          elem_blk_parms[i].num_nodes_per_side[0] = 2;
        else 
          elem_blk_parms[i].num_nodes_per_side[0] = 3;
      }
      else if (ndim == 3)  /* 3d TRIs */
      {
        elem_blk_parms[i].elem_type_val = EX_EL_TRISHELL;
        elem_blk_parms[i].num_nodes_per_side[0] =
          elem_blk_parms[i].num_nodes_per_elem;
      }
    }
    else if (strncmp(elem_blk_parms[i].elem_type,"SHELL",3) == 0)
    {
      elem_blk_parms[i].elem_type_val = EX_EL_SHELL;
      /* determine side set node stride */
      if (elem_blk_parms[i].num_nodes_per_elem == 2)
      {
        /* 2d SHELL; same as BEAM or TRUSS or BAR */
        elem_blk_parms[i].num_nodes_per_side[0] = 2;
        elem_blk_parms[i].elem_type_val = EX_EL_BEAM;
      }
      else if (elem_blk_parms[i].num_nodes_per_elem == 4)
        elem_blk_parms[i].num_nodes_per_side[0] = 4;
      else
        elem_blk_parms[i].num_nodes_per_side[0] = 8;
    }
    else if (strncmp(elem_blk_parms[i].elem_type,"HEX",3) == 0)
    {
      elem_blk_parms[i].elem_type_val = EX_EL_HEX;
      /* determine side set node stride */
      if (elem_blk_parms[i].num_nodes_per_elem == 8)
        elem_blk_parms[i].num_nodes_per_side[0] = 4;
      else if (elem_blk_parms[i].num_nodes_per_elem == 9)
        elem_blk_parms[i].num_nodes_per_side[0] = 4;
      else if (elem_blk_parms[i].num_nodes_per_elem == 12)  /* HEXSHELL */
        elem_blk_parms[i].num_nodes_per_side[0] = 4;
      else if (elem_blk_parms[i].num_nodes_per_elem == 27)
        elem_blk_parms[i].num_nodes_per_side[0] = 9;
      else
        elem_blk_parms[i].num_nodes_per_side[0] = 8;
    }
    else if (strncmp(elem_blk_parms[i].elem_type,"TETRA",3) == 0)
    {
      elem_blk_parms[i].elem_type_val = EX_EL_TETRA;
      /* determine side set node stride */
      if (elem_blk_parms[i].num_nodes_per_elem == 4)
        elem_blk_parms[i].num_nodes_per_side[0] = 3;
      else if (elem_blk_parms[i].num_nodes_per_elem == 8)
        elem_blk_parms[i].num_nodes_per_side[0] = 4;
      else
        elem_blk_parms[i].num_nodes_per_side[0] = 6;
    }
    else if (strncmp(elem_blk_parms[i].elem_type,"WEDGE",3) == 0)
    {
      elem_blk_parms[i].elem_type_val = EX_EL_WEDGE;
      /* determine side set node stride */
      if (elem_blk_parms[i].num_nodes_per_elem == 6)
        elem_blk_parms[i].num_nodes_per_side[0] = 4;
      else
        elem_blk_parms[i].num_nodes_per_side[0] = 8;
      sprintf(errmsg,
             "Warning: WEDGE%d is assumed to have %d nodes per face",
              elem_blk_parms[i].num_nodes_per_elem,
              elem_blk_parms[i].num_nodes_per_side[0]);
      ex_err("ex_cvt_nodes_to_sides",errmsg,EX_MSG);
    }
    else if (strncmp(elem_blk_parms[i].elem_type,"PYRAMID",3) == 0)
    {
      elem_blk_parms[i].elem_type_val = EX_EL_PYRAMID;
      /* determine side set node stride */
      if (elem_blk_parms[i].num_nodes_per_elem == 5)
        elem_blk_parms[i].num_nodes_per_side[0] = 4;
      else
        elem_blk_parms[i].num_nodes_per_side[0] = 8;
      sprintf(errmsg,
             "Warning: PYRAMID%d is assumed to have %d nodes per face",
              elem_blk_parms[i].num_nodes_per_elem,
              elem_blk_parms[i].num_nodes_per_side[0]);
      ex_err("ex_cvt_nodes_to_sides",errmsg,EX_MSG);
    }
    else if (strncmp(elem_blk_parms[i].elem_type,"BEAM",3) == 0)
    {
      elem_blk_parms[i].elem_type_val = EX_EL_BEAM;
      /* determine side set node stride */
      if (elem_blk_parms[i].num_nodes_per_elem == 2)
        elem_blk_parms[i].num_nodes_per_side[0] = 2;
      else 
        elem_blk_parms[i].num_nodes_per_side[0] = 3;
    }
    else if ( (strncmp(elem_blk_parms[i].elem_type,"TRUSS",3) == 0) ||
              (strncmp(elem_blk_parms[i].elem_type,"BAR",3) == 0)  ||
              (strncmp(elem_blk_parms[i].elem_type,"EDGE",3) == 0) )
    {
      elem_blk_parms[i].elem_type_val = EX_EL_TRUSS;
      /* determine side set node stride */
      if (elem_blk_parms[i].num_nodes_per_elem == 2)
        elem_blk_parms[i].num_nodes_per_side[0] = 2;
      else 
        elem_blk_parms[i].num_nodes_per_side[0] = 3;
    }
    else if (strncmp(elem_blk_parms[i].elem_type,"NULL",3) == 0)
    {
      elem_blk_parms[i].elem_type_val = EX_EL_NULL_ELEMENT;
      /* set side set node stride */
      elem_blk_parms[i].num_nodes_per_side[0] = 0;
    }
    else
    { /* unsupported element type; no problem if no sides specified for
         this element block */
      elem_blk_parms[i].elem_type_val = EX_EL_UNK;
      elem_blk_parms[i].num_nodes_per_side[0] = 0;
    }
    elem_blk_parms[i].elem_blk_id = elem_blk_ids[i];    /* save id */
    elem_ctr += elem_blk_parms[i].num_elem_in_blk;
    elem_blk_parms[i].elem_ctr = elem_ctr;      /* save elem number max */
  }


  /* Allocate space for the ss element to element block parameter index array */
  if (!(ss_parm_ndx=malloc(tot_num_ss_elem*sizeof(int))))
  {
    free(elem_blk_parms);
    free(elem_blk_ids);
    free(ss_elem_ndx);
    exerrval = EX_MEMFAIL;
    sprintf(errmsg,
"Error: failed to allocate space for side set elem parms index for file id %d"
,
            exoid);
    ex_err("ex_cvt_nodes_to_sides",errmsg,exerrval);
    return (EX_FATAL);
  }


  /* Allocate space for the ss element to node list index array */
  if (!(ss_elem_node_ndx=malloc((tot_num_ss_elem+1)*sizeof(int))))
  {
    free(ss_parm_ndx);
    free(elem_blk_parms);
    free(elem_blk_ids);
    free(ss_elem_ndx);
    exerrval = EX_MEMFAIL;
    sprintf(errmsg,
"Error: failed to allocate space for side set elem to node index for file id %d",
            exoid);
    ex_err("ex_cvt_nodes_to_sides",errmsg,exerrval);
    return (EX_FATAL);
  }

/* determine if each side set has uniform element types; this will
   be used to help determine the stride through the node list
*/

  /* Allocate space for same element type flag array*/
  if (!(same_elem_type=malloc(num_side_sets*sizeof(int))))
  {
    free(ss_elem_ndx);
    exerrval = EX_MEMFAIL;
    sprintf(errmsg,
   "Error: failed to allocate space for element type flag array for file id %d",
            exoid);
    ex_err("ex_cvt_nodes_to_sides",errmsg,exerrval);
    return (EX_FATAL);
  }

  elem_ctr = num_elem_per_set[0];
  same_elem_type[0] = TRUE;
  for (i=0,k=0;i<tot_num_ss_elem;i++)
  {
    for (j=0; j<num_elem_blks; j++)
    {
      if (side_sets_elem_list[i] <= elem_blk_parms[j].elem_ctr) break;
    }

    if (i==0) {
      el_type = elem_blk_parms[j].elem_type_val;
    } 

    /* determine which side set this element is in; assign to kth side set */
    if (i >= elem_ctr) {
      elem_ctr += num_elem_per_set[++k];
      el_type = elem_blk_parms[j].elem_type_val;
      same_elem_type[k] = TRUE;
    }

    if (el_type != elem_blk_parms[j].elem_type_val) same_elem_type[k] = FALSE;

  }

/* Build side set element to node list index and side set element 
   parameter index.
*/
  node_ctr = 0;
  elem_ctr = num_elem_per_set[0];
  for (i=0,k=0;i<tot_num_ss_elem;i++)
  {
    for (j=0; j<num_elem_blks; j++)
    {
      if (side_sets_elem_list[i] <= elem_blk_parms[j].elem_ctr)
      {
        ss_parm_ndx[i] = j;     /* assign parameter block index */
        break;
      }
    }
    ss_elem_node_ndx[i] = node_ctr;     /* assign node list index */

    /* determine which side set this element is in; assign to kth side set */
    if (i >= elem_ctr) {
       /* skip over NULL side sets */
       while (num_elem_per_set[++k] == 0);
       elem_ctr += num_elem_per_set[k];
    }

    /* determine number of nodes per side */
    if (((num_nodes_per_set[k] % num_elem_per_set[k]) == 0) &&
         (same_elem_type[k])) {  /* all side set elements are same type */
       node_ctr += num_nodes_per_set[k] /num_elem_per_set[k];
    } else {
       node_ctr += elem_blk_parms[j].num_nodes_per_side[0];
    }
  }

  ss_elem_node_ndx[i] = node_ctr;       /* assign node list index */
  free(same_elem_type);
  
  /* All setup, ready to go ... */
  
  elem_ctr=0;

  for (j=0; j < tot_num_ss_elem; j++)
  {

    if (side_sets_elem_list[ss_elem_ndx[j]] > elem_ctr)
    {
      /* release connectivity array space and get next one */
      if (elem_ctr > 0)
        free(connect);

      /* Allocate space for the connectivity array for new element block */
      if (!(connect= 
             malloc(elem_blk_parms[ss_parm_ndx[ss_elem_ndx[j]]].num_elem_in_blk*
                 elem_blk_parms[ss_parm_ndx[ss_elem_ndx[j]]].num_nodes_per_elem*
                                 sizeof(int))))
      {
        exerrval = EX_MEMFAIL;
        sprintf(errmsg,
        "Error: failed to allocate space for connectivity array for file id %d",
                exoid);
        ex_err("ex_cvt_nodes_to_sides",errmsg,exerrval);
        free(ss_elem_node_ndx);
        free(ss_parm_ndx);
        free(elem_blk_parms);
        free(elem_blk_ids);
        free(ss_elem_ndx);
        return (EX_FATAL);
      }

      /* get connectivity array */
      if (ex_get_elem_conn(
                        exoid,
                        elem_blk_parms[ss_parm_ndx[ss_elem_ndx[j]]].elem_blk_id,
                        connect) == -1)
      {
        sprintf(errmsg,
       "Error: failed to get connectivity array for elem blk %d for file id %d",
                elem_blk_parms[ss_parm_ndx[ss_elem_ndx[j]]].elem_blk_id,
                exoid);
        ex_err("ex_cvt_nodes_to_sides",errmsg,exerrval);
        free(connect);
        free(ss_elem_node_ndx);
        free(ss_parm_ndx);
        free(elem_blk_parms);
        free(elem_blk_ids);
        free(ss_elem_ndx);
        return (EX_FATAL);
      }
      elem_ctr = elem_blk_parms[ss_parm_ndx[ss_elem_ndx[j]]].elem_ctr;
    }
/*  For the first node of each side in side set, using a linear search 
      (of up to num_nodes_per_elem) of the connectivity array, 
      locate the node position in the element. The first node position
      and the second node position are used with a element type specific
      table to determine the side. */

    elem_num = side_sets_elem_list[ss_elem_ndx[j]]-1;/* element number 0-based*/
    /* calculate the relative element number position in it's block*/
    elem_num_pos = elem_num - 
                  (elem_blk_parms[ss_parm_ndx[ss_elem_ndx[j]]].elem_ctr -
                   elem_blk_parms[ss_parm_ndx[ss_elem_ndx[j]]].num_elem_in_blk);
    /* calculate the beginning of the node list for this element by
         using the ss_elem_node_ndx index into the side_sets_node_index
         and adding the element number position * number of nodes per elem */

    num_nodes_per_elem = 
               elem_blk_parms[ss_parm_ndx[ss_elem_ndx[j]]].num_nodes_per_elem;
    for (n=0; n<num_nodes_per_elem; n++)
    {
      /* find node in connectivity array that matches first node in side set */
      if (side_sets_node_list[ss_elem_node_ndx[ss_elem_ndx[j]]] == 
          connect[num_nodes_per_elem*(elem_num_pos)+n])
      {
        switch (elem_blk_parms[ss_parm_ndx[ss_elem_ndx[j]]].elem_type_val)
        {
          case EX_EL_CIRCLE:
          case EX_EL_SPHERE:
          {
            /* simple case: 1st node number is same as side # */
                side_sets_side_list[ss_elem_ndx[j]] = n+1;
            break;
          }
          case EX_EL_QUAD:
          case EX_EL_TRIANGLE:
          case EX_EL_TRUSS:
          case EX_EL_BEAM:
          {
            /* simple case: 1st node number is same as side # */
                side_sets_side_list[ss_elem_ndx[j]] = n+1;
            break;
          }
          case EX_EL_TRISHELL:
          {
            /* use table to find which node to compare to next */
            num_node_per_side = ss_elem_node_ndx[ss_elem_ndx[j]+1] - 
                                ss_elem_node_ndx[ss_elem_ndx[j]];

            if (side_sets_node_list[ss_elem_node_ndx[ss_elem_ndx[j]]+1] ==
                connect[num_nodes_per_elem*(elem_num_pos)+
                        (trishell_table[0][2*n]-1)]) 
            {
              /* Assume only front or back, no edges... */
              side_sets_side_list[ss_elem_ndx[j]] = trishell_table[1][2*n];
            }
            else if (side_sets_node_list[ss_elem_node_ndx[ss_elem_ndx[j]]+1] ==
                connect[num_nodes_per_elem*(elem_num_pos)+
                        (trishell_table[0][2*n+1]-1)]) 
            {
              /* Assume only front or back, no edges... */
              side_sets_side_list[ss_elem_ndx[j]] = trishell_table[1][2*n+1];
            }
            else if (side_sets_node_list[ss_elem_node_ndx[ss_elem_ndx[j]]+1] ==
                connect[num_nodes_per_elem*(elem_num_pos)+
                        (trishell_table[0][2*n+2]-1)]) 
            {
              /* Assume only front or back, no edges... */
              side_sets_side_list[ss_elem_ndx[j]] = trishell_table[1][2*n+2];
            }
            else
            { 
              exerrval = EX_BADPARAM;
              sprintf(errmsg,
                     "Error: failed to find TRIANGULAR SHELL element %d, node %d in connectivity array %d for file id %d",
                     side_sets_elem_list[ss_elem_ndx[j]],
                     side_sets_node_list[ss_elem_node_ndx[ss_elem_ndx[j]]+1],
                     elem_blk_parms[ss_parm_ndx[ss_elem_ndx[j]]].elem_blk_id,
                     exoid);
              ex_err("ex_cvt_nodes_to_sides",errmsg,exerrval);
              free(connect);
              free(ss_elem_node_ndx);
              free(ss_parm_ndx);
              free(elem_blk_parms);
              free(elem_blk_ids);
              free(ss_elem_ndx);
              return (EX_FATAL);
            }
            break;

          }
          case EX_EL_SHELL:
          {
            /* use table to find which node to compare to next */

            num_node_per_side = ss_elem_node_ndx[ss_elem_ndx[j]+1] - 
                                ss_elem_node_ndx[ss_elem_ndx[j]];

            if (side_sets_node_list[ss_elem_node_ndx[ss_elem_ndx[j]]+1] ==
                connect[num_nodes_per_elem*(elem_num_pos)+
                        (shell_table[0][2*n]-1)]) 
            {
              if (num_node_per_side >= 4)
                /* 4- or 8-node side (front or back face) */
                side_sets_side_list[ss_elem_ndx[j]] = shell_table[1][2*n];
              else
                /* 2- or 3-node side (edge of shell) */
                side_sets_side_list[ss_elem_ndx[j]] = shell_edge_table[1][2*n];
            }
            else if (side_sets_node_list[ss_elem_node_ndx[ss_elem_ndx[j]]+1] ==
                connect[num_nodes_per_elem*(elem_num_pos)+
                        (shell_table[0][2*n+1]-1)]) 
            {
              if (num_node_per_side >= 4)
                /* 4- or 8-node side (front or back face) */
                side_sets_side_list[ss_elem_ndx[j]] = shell_table[1][2*n+1];
              else
                /* 2- or 3-node side (edge of shell) */
                side_sets_side_list[ss_elem_ndx[j]]=shell_edge_table[1][2*n+1];
            }
            else if (side_sets_node_list[ss_elem_node_ndx[ss_elem_ndx[j]]+1] ==
                connect[num_nodes_per_elem*(elem_num_pos)+
                        (shell_table[0][2*n+2]-1)]) 
            {
              if (num_node_per_side >= 4)
                /* 4- or 8-node side (front or back face) */
                side_sets_side_list[ss_elem_ndx[j]] = shell_table[1][2*n+2];
              else
                /* 2- or 3-node side (edge of shell) */
                side_sets_side_list[ss_elem_ndx[j]]=shell_edge_table[1][2*n+2];
            }
            else
            { 
              exerrval = EX_BADPARAM;
              sprintf(errmsg,
                     "Error: failed to find SHELL element %d, node %d in connectivity array %d for file id %d",
                     side_sets_elem_list[ss_elem_ndx[j]],
                     side_sets_node_list[ss_elem_node_ndx[ss_elem_ndx[j]]+1],
                     elem_blk_parms[ss_parm_ndx[ss_elem_ndx[j]]].elem_blk_id,
                     exoid);
              ex_err("ex_cvt_nodes_to_sides",errmsg,exerrval);
              free(connect);
              free(ss_elem_node_ndx);
              free(ss_parm_ndx);
              free(elem_blk_parms);
              free(elem_blk_ids);
              free(ss_elem_ndx);
              return (EX_FATAL);
            }
            break;

          }
          case EX_EL_HEX:
          {
            /* use table to find which node to compare to next */
          
            if (side_sets_node_list[ss_elem_node_ndx[ss_elem_ndx[j]]+1] == 
                connect[num_nodes_per_elem*(elem_num_pos)+
                        (hex_table[0][3*n]-1)])
              side_sets_side_list[ss_elem_ndx[j]] = hex_table[1][3*n];
            else if (side_sets_node_list[ss_elem_node_ndx[ss_elem_ndx[j]]+1] == 
                connect[num_nodes_per_elem*(elem_num_pos)+
                        (hex_table[0][3*n+1]-1)])
              side_sets_side_list[ss_elem_ndx[j]] = hex_table[1][3*n+1];
            else if (side_sets_node_list[ss_elem_node_ndx[ss_elem_ndx[j]]+1] == 
                connect[num_nodes_per_elem*(elem_num_pos)+
                        (hex_table[0][3*n+2]-1)])
              side_sets_side_list[ss_elem_ndx[j]] = hex_table[1][3*n+2];
            else
            {
              exerrval = EX_BADPARAM;
              sprintf(errmsg,
                     "Error: failed to find HEX element %d, node %d in connectivity array %d for file id %d",
                     side_sets_elem_list[ss_elem_ndx[j]],
                     side_sets_node_list[ss_elem_node_ndx[ss_elem_ndx[j]]+1],
                     elem_blk_parms[ss_parm_ndx[ss_elem_ndx[j]]].elem_blk_id,
                     exoid);
              ex_err("ex_cvt_nodes_to_sides",errmsg,exerrval);
              free(connect);
              free(ss_elem_node_ndx);
              free(ss_parm_ndx);
              free(elem_blk_parms);
              free(elem_blk_ids);
              free(ss_elem_ndx);
              return (EX_FATAL);
            }
            break;
          }
          case EX_EL_TETRA:
          {
            /* use table to find which node to compare to next */
          
            if (side_sets_node_list[ss_elem_node_ndx[ss_elem_ndx[j]]+1] == 
                connect[num_nodes_per_elem*(elem_num_pos)+
                        (tetra_table[0][3*n]-1)])
              side_sets_side_list[ss_elem_ndx[j]] = tetra_table[1][3*n];
            else if (side_sets_node_list[ss_elem_node_ndx[ss_elem_ndx[j]]+1] == 
                connect[num_nodes_per_elem*(elem_num_pos)+
                        (tetra_table[0][3*n+1]-1)])
              side_sets_side_list[ss_elem_ndx[j]] = tetra_table[1][3*n+1];
            else if (side_sets_node_list[ss_elem_node_ndx[ss_elem_ndx[j]]+1] == 
                connect[num_nodes_per_elem*(elem_num_pos)+
                        (tetra_table[0][3*n+2]-1)])
              side_sets_side_list[ss_elem_ndx[j]] = tetra_table[1][3*n+2];
            else
            {
              exerrval = EX_BADPARAM;
              sprintf(errmsg,
                     "Error: failed to find TETRA element %d, node %d in connectivity array %d for file id %d",
                     side_sets_elem_list[ss_elem_ndx[j]],
                     side_sets_node_list[ss_elem_node_ndx[ss_elem_ndx[j]]+1],
                     elem_blk_parms[ss_parm_ndx[ss_elem_ndx[j]]].elem_blk_id,
                     exoid);
              ex_err("ex_cvt_nodes_to_sides",errmsg,exerrval);
              free(connect);
              free(ss_elem_node_ndx);
              free(ss_parm_ndx);
              free(elem_blk_parms);
              free(elem_blk_ids);
              free(ss_elem_ndx);
              return (EX_FATAL);
            }
            break;
          }
          case EX_EL_PYRAMID:
          {
 /* NOTE: PYRAMID elements in side set node lists are currently not supported */
            exerrval = EX_BADPARAM;
            sprintf(errmsg,
  "ERROR: unsupported PYRAMID element found in side set node list in file id %d",
                    exoid);
            ex_err("ex_cvt_nodes_to_sides",errmsg,exerrval);
            free(connect);
            free(ss_elem_node_ndx);
            free(ss_parm_ndx);
            free(elem_blk_parms);
            free(elem_blk_ids);
            free(ss_elem_ndx);
            return (EX_FATAL);
          }
          case EX_EL_WEDGE:
          {
#if 1
 /* NOTE: WEDGE elements in side set node lists are currently not supported */
            exerrval = EX_BADPARAM;
            sprintf(errmsg,
  "ERROR: unsupported WEDGE element found in side set node list in file id %d",
                    exoid);
            ex_err("ex_cvt_nodes_to_sides",errmsg,exerrval);
            free(connect);
            free(ss_elem_node_ndx);
            free(ss_parm_ndx);
            free(elem_blk_parms);
            free(elem_blk_ids);
            free(ss_elem_ndx);
            return (EX_FATAL);

#else
            /* use wedge_table to find which node to compare to next */
          
/* This section is commented out because Wedges are no longer supported !!!*/

            if (side_sets_node_list[ss_elem_node_ndx[ss_elem_ndx[j]]+1] == 
                connect[num_nodes_per_elem*(elem_num_pos)+
                        (wedge_table[0][3*n]-1)])
              side_sets_side_list[ss_elem_ndx[j]] = wedge_table[1][3*n];
            else if (side_sets_node_list[ss_elem_node_ndx[ss_elem_ndx[j]]+1] == 
                connect[num_nodes_per_elem*(elem_num_pos)+
                        (wedge_table[0][3*n+1]-1)])
              side_sets_side_list[ss_elem_ndx[j]] = wedge_table[1][3*n+1];
            else if (side_sets_node_list[ss_elem_node_ndx[ss_elem_ndx[j]]+1] == 
                connect[num_nodes_per_elem*(elem_num_pos)+
                        (wedge_table[0][3*n+2]-1)])
              side_sets_side_list[ss_elem_ndx[j]] = wedge_table[1][3*n+2];
            else
            {
              exerrval = EX_BADPARAM;
              sprintf(errmsg,
                     "Error: failed to find WEDGE element %d, node %d in connectivity array %d for file id %d",
                     side_sets_elem_list[ss_elem_ndx[j]],
                     side_sets_node_list[ss_elem_node_ndx[ss_elem_ndx[j]]+1],
                     elem_blk_parms[ss_parm_ndx[ss_elem_ndx[j]]].elem_blk_id,
                     exoid);
              ex_err("ex_cvt_nodes_to_sides",errmsg,exerrval);
              free(connect);
              free(ss_elem_node_ndx);
              free(ss_parm_ndx);
              free(elem_blk_parms);
              free(elem_blk_ids);
              free(ss_elem_ndx);
              return (EX_FATAL);
            }
            break;
#endif
          }
          default:
          {
            exerrval = EX_BADPARAM;
            sprintf(errmsg,
                   "Error: %s is an unsupported element type",
                    elem_blk_parms[ss_parm_ndx[ss_elem_ndx[j]]].elem_type);
            ex_err("ex_cvt_nodes_to_sides",errmsg,exerrval);
            return(EX_FATAL);
          }
        }
        break; /* done with this element */
      }
    }
    if (n >= num_nodes_per_elem) /* did we find the node? */
    {
      exerrval = EX_BADPARAM;
      sprintf(errmsg,
             "Error: failed to find element %d, node %d in element block %d for file id %d",
              side_sets_elem_list[ss_elem_ndx[j]],
              side_sets_node_list[ss_elem_node_ndx[ss_elem_ndx[j]]],
              elem_blk_parms[ss_parm_ndx[ss_elem_ndx[j]]].elem_blk_id,
              exoid);
      ex_err("ex_cvt_nodes_to_sides",errmsg,exerrval);
      free(connect);
      free(ss_elem_node_ndx);
      free(ss_parm_ndx);
      free(elem_blk_parms);
      free(elem_blk_ids);
      free(ss_elem_ndx);
      return (EX_FATAL);
    }

  }

  /* All done: release connectivity array space, element block ids array,
     element block parameters array, and side set element index array */
  free(connect);
  free(ss_elem_node_ndx);
  free(ss_parm_ndx);
  free(elem_blk_parms);
  free(elem_blk_ids);
  free(ss_elem_ndx);

  return (EX_NOERR);
}

