vlist.c 34.3 KB
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#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif

#include "dmemory.h"
#include "cdi.h"
#include "stream_int.h"
#include "vlist.h"
#include "varscan.h"


static int  VLIST_Debug = 0;   /* If set to 1, debugging */

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static int _vlist_max = MAX_VLISTS;
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static void vlist_initialize(void);

static int _vlist_init = FALSE;

#if  defined  (HAVE_LIBPTHREAD)
#  include <pthread.h>

static pthread_once_t _vlist_init_thread = PTHREAD_ONCE_INIT;
static pthread_mutex_t _vlist_mutex;

#  define VLIST_LOCK           pthread_mutex_lock(&_vlist_mutex);
#  define VLIST_UNLOCK         pthread_mutex_unlock(&_vlist_mutex);
#  define VLIST_INIT                               \
   if ( _vlist_init == FALSE ) pthread_once(&_vlist_init_thread, vlist_initialize);

#else

#  define VLIST_LOCK
#  define VLIST_UNLOCK
#  define VLIST_INIT                               \
   if ( _vlist_init == FALSE ) vlist_initialize();

#endif


typedef struct _vlistPtrToIdx {
  int idx;
  VLIST *ptr;
  struct _vlistPtrToIdx *next;
} vlistPtrToIdx;


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static vlistPtrToIdx *_vlistList  = NULL;
static vlistPtrToIdx *_vlistAvail = NULL;
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static void vlist_list_new(void)
{
  static char func[] = "vlist_list_new";

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  assert(_vlistList == NULL);

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  _vlistList = (vlistPtrToIdx *) malloc(_vlist_max*sizeof(vlistPtrToIdx));
}


static void vlist_list_delete(void)
{
  static char func[] = "vlist_list_delete";

  if ( _vlistList ) free(_vlistList);
}


static void vlist_init_pointer(void)
{
  int  i;
  
  for ( i = 0; i < _vlist_max; i++ )
    {
      _vlistList[i].next = _vlistList + i + 1;
      _vlistList[i].idx  = i;
      _vlistList[i].ptr  = 0;
    }

  _vlistList[_vlist_max-1].next = 0;

  _vlistAvail = _vlistList;
}


VLIST *vlist_to_pointer(int idx)
{
  static char func[] = "vlist_to_pointer";
  VLIST *vlistptr = NULL;

  VLIST_INIT

  if ( idx >= 0 && idx < _vlist_max )
    {
      VLIST_LOCK

      vlistptr = _vlistList[idx].ptr;

      VLIST_UNLOCK
    }
  else
    Error(func, "vlist index %d undefined!", idx);

  return (vlistptr);
}


/* Create an index from a pointer */
static int vlist_from_pointer(VLIST *ptr)
{
  static char func[] = "vlist_from_pointer";
  int      idx = -1;
  vlistPtrToIdx *newptr;

  if ( ptr )
    {
      VLIST_LOCK

      if ( _vlistAvail )
	{
	  newptr       = _vlistAvail;
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	  _vlistAvail  = _vlistAvail->next;
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	  newptr->next = 0;
	  idx	       = newptr->idx;
	  newptr->ptr  = ptr;
      
	  if ( VLIST_Debug )
	    Message(func, "Pointer %p has idx %d from vlist list", ptr, idx);
	}
      else
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	Warning(func, "Too many open vlists (limit is %d)!", _vlist_max);
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      VLIST_UNLOCK
    }
  else
    Error(func, "Internal problem (pointer %p undefined)", ptr);

  return (idx);
}


static void vlist_init_entry(VLIST *vlistptr)
{
  vlistptr->self           = vlist_from_pointer(vlistptr);

  vlistptr->nlock          = 0;
  vlistptr->nvars          = 0;
  vlistptr->vars           = NULL;
  vlistptr->ngrids         = 0;
  vlistptr->nzaxis         = 0;
  vlistptr->taxisID        = CDI_UNDEFID; 
  vlistptr->instID         = cdiDefaultInstID;
  vlistptr->modelID        = cdiDefaultModelID;
  vlistptr->tableID        = cdiDefaultTableID;
  vlistptr->varsAllocated  = 0;
  vlistptr->ntsteps        = CDI_UNDEFID;
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  vlistptr->atts.nalloc    = MAX_ATTRIBUTES;
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  vlistptr->atts.nelems    = 0;
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}


static VLIST *vlist_new_entry(void)
{
  static char func[] = "vlist_new_entry";
  VLIST *vlistptr;

  vlistptr = (VLIST *) malloc(sizeof(VLIST));

  if ( vlistptr ) vlist_init_entry(vlistptr);

  return (vlistptr);
}


static void vlist_delete_entry(VLIST *vlistptr)
{
  static char func[] = "vlist_delete_entry";
  int idx;

  idx = vlistptr->self;

  VLIST_LOCK

  free(vlistptr);

  _vlistList[idx].next = _vlistAvail;
  _vlistList[idx].ptr  = 0;
  _vlistAvail          = &_vlistList[idx];

  VLIST_UNLOCK

  if ( VLIST_Debug )
    Message(func, "Removed idx %d from vlist list", idx);
}


static void vlist_initialize(void)
{
  char *env;

#if  defined  (HAVE_LIBPTHREAD)
  /* initialize global API mutex lock */
  pthread_mutex_init(&_vlist_mutex, NULL);
#endif

  env = getenv("VLIST_DEBUG");
  if ( env ) VLIST_Debug = atoi(env);

  vlist_list_new();
  atexit(vlist_list_delete);

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  VLIST_LOCK

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  vlist_init_pointer();

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  VLIST_UNLOCK

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  _vlist_init = TRUE;
}


static void vlist_copy(VLIST *vlistptr2, VLIST *vlistptr1)
{
  int vlistID2;

  vlistID2 = vlistptr2->self;
  memcpy(vlistptr2, vlistptr1, sizeof(VLIST));
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  vlistptr2->atts.nelems = 0;
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  vlistptr2->self = vlistID2;
}


static void vlist_check_ptr(const char *func, VLIST *vlistptr)
{
  if ( vlistptr == NULL )
    Error(func, "vlist undefined!");
}


/*
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@Function  vlistCreate
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@Title     Create a variable list

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@Prototype int vlistCreate(void)
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@Example
Here is an example using @func{vlistCreate} to create a variable list
and add a variable with @func{vlistDefVar}.

@Source
#include "cdi.h"
   ...
int vlistID, varID;
   ...
vlistID = vlistCreate();
varID = vlistDefVar(vlistID, gridID, zaxisID, TIME_VARIABLE);
   ...
streamDefVlist(streamID, vlistID);
   ...
vlistDestroy(vlistID);
   ...
@EndSource
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@EndFunction
*/
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int vlistCreate(void)
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{
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  static char func[] = "vlistCreate";
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  int vlistID = 0;
  VLIST *vlistptr;

  VLIST_INIT

  vlistptr = vlist_new_entry();
  if ( ! vlistptr ) Error(func, "No memory");

  vlistID = vlistptr->self;

  vlistLock(vlistID);

  return (vlistID);
}


/*
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@Function  vlistDestroy
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@Title     Destroy a variable list
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@Prototype void vlistDestroy(int vlistID)
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@Parameter
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    @Item  vlistID  Variable list ID, from a previous call to @fref{vlistCreate}
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@EndFunction
*/
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void vlistDestroy(int vlistID)
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{
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  static char func[] = "vlistDestroy";
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  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  vlistUnlock(vlistID);

  if ( vlistptr->nlock > 0 )
    {
      Warning(func, "vlist %d is locked!", vlistID);
    }
  else
    {
      int nvars = vlistptr->nvars;
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      int varID;
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      vlistDelAtts(vlistID, CDI_GLOBAL);
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      for ( varID = 0; varID < nvars; varID++ )
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	{
	  if ( vlistptr->vars[varID].levinfo ) free(vlistptr->vars[varID].levinfo);

	  vlistDelAtts(vlistID, varID);
	}
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      if ( vlistptr->vars ) free(vlistptr->vars);

      vlist_delete_entry(vlistptr);
    }
}

int vlistNlock(int vlistID)
{
  static char func[] = "vlistNlock";
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  return (vlistptr->nlock);
}

void vlistLock(int vlistID)
{
  static char func[] = "vlistLock";
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  vlistptr->nlock++;
  /*  Message(func, "vlistID %d nlock %d", vlistID, vlistptr->nlock); */
}

void vlistUnlock(int vlistID)
{
  static char func[] = "vlistUnlock";
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  vlistptr->nlock--;
  /*  Message(func, "vlistID %d nlock %d", vlistID, vlistptr->nlock); */
}


/*
@Function  vlistCopy
@Title     Copy a variable list

@Prototype void vlistCopy(int vlistID2, int vlistID1)
@Parameter
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    @Item  vlistID2  Target variable list ID
    @Item  vlistID1  Source variable list ID
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@Description
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The function @func{vlistCopy} copies all entries from vlistID1 to vlistID2.
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@EndFunction
*/
void vlistCopy(int vlistID2, int vlistID1)
{
  static char func[] = "vlistCopy";
  VLIST *vlistptr1, *vlistptr2;

  vlistptr1 = vlist_to_pointer(vlistID1);
  vlistptr2 = vlist_to_pointer(vlistID2);

  vlist_check_ptr(func, vlistptr1);
  vlist_check_ptr(func, vlistptr2);

  vlist_copy(vlistptr2, vlistptr1);

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  vlistCopyVarAtts(vlistID1, CDI_GLOBAL, vlistID2, CDI_GLOBAL);
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  if ( vlistptr1->vars )
    {
      int nvars = vlistptr1->nvars;
      int nlevs, varID;

      vlistptr2->vars = (VARINFO *) malloc(nvars*sizeof(VARINFO));
      memcpy(vlistptr2->vars, vlistptr1->vars, nvars*sizeof(VARINFO));

      for ( varID = 0; varID < nvars; varID++ )
	{
	  if ( vlistptr1->vars[varID].name )
	    vlistptr2->vars[varID].name = strdupx(vlistptr1->vars[varID].name);

	  if ( vlistptr1->vars[varID].longname )
	    vlistptr2->vars[varID].longname = strdupx(vlistptr1->vars[varID].longname);

	  if ( vlistptr1->vars[varID].stdname )
	    vlistptr2->vars[varID].stdname = strdupx(vlistptr1->vars[varID].stdname);

	  if ( vlistptr1->vars[varID].units )
	    vlistptr2->vars[varID].units = strdupx(vlistptr1->vars[varID].units);

	  nlevs = vlistptr1->vars[varID].nlevs;
	  vlistptr2->vars[varID].levinfo = (LEVINFO *) malloc(nlevs*sizeof(LEVINFO));
	  memcpy(vlistptr2->vars[varID].levinfo,
		 vlistptr1->vars[varID].levinfo, nlevs*sizeof(LEVINFO));
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	  vlistptr2->vars[varID].atts.nelems = 0;
	  vlistCopyVarAtts(vlistID1, varID, vlistID2, varID);
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	}
    }

  vlistptr2->nlock = 0;
}


/*
@Function  vlistDuplicate
@Title     Duplicate a variable list

@Prototype int vlistDuplicate(int vlistID)
@Parameter
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    @Item  vlistID  Variable list ID, from a previous call to @fref{vlistCreate}
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@Description
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The function @func{vlistDuplicate} duplicates the variable list from vlistID1.
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@Result
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@func{vlistDuplicate} returns an identifier to the duplicated variable list.
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@EndFunction
*/
int vlistDuplicate(int vlistID)
{
  static char func[] = "vlistDuplicate";
  int vlistIDnew;
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

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  vlistIDnew = vlistCreate();
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  vlistCopy(vlistIDnew, vlistID);

  return (vlistIDnew);
}


void vlistClearFlag(int vlistID)
{
  int varID, levID;
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  for ( varID = 0; varID < vlistptr->nvars; varID++ )
    {
      vlistptr->vars[varID].flag = FALSE;
      for ( levID = 0; levID < vlistptr->vars[varID].nlevs; levID++ )
	{
	  vlistptr->vars[varID].levinfo[levID].flag = FALSE;
	}
    }
}


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int vlistInqZaxis(int vlistID, int zaxistype, int nlevels, double *levels, int lbounds, double *levels2,
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		  int vctsize, const double *vct)
{
  static char func[] = "vlistInqZaxis";
  int zaxisdefined;
  int nzaxis;
  int zaxisID = CDI_UNDEFID;
  int index;
  int zaxisglobdefined = 0;
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  zaxisdefined = 0;
  nzaxis = vlistptr->nzaxis;

  for ( index = 0; index < nzaxis; index++ )
    {
      zaxisID = vlistptr->zaxisIDs[index];

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      if ( zaxisCompare(zaxisID, zaxistype, nlevels, lbounds, levels, NULL, NULL, 0) == 0 )
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	{
	  zaxisdefined = 1;
	  break;
	}
    }

  if ( ! zaxisdefined )
    {
      nzaxis = zaxisSize();
      for ( zaxisID = 0; zaxisID < nzaxis; zaxisID++ )
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	if ( zaxisCompare(zaxisID, zaxistype, nlevels, lbounds, levels, NULL, NULL, 0) == 0 )
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	  {
	    zaxisglobdefined = 1;
	    break;
	  }
    }

  if ( ! zaxisdefined )
    {
      if ( ! zaxisglobdefined )
	{
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	  zaxisID = zaxisCreate(zaxistype, nlevels);
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	  zaxisDefLevels(zaxisID, levels);
	  if ( lbounds )
	    {
	      zaxisDefLbounds(zaxisID, levels);
	      zaxisDefUbounds(zaxisID, levels2);
	    }

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	  if ( zaxistype == ZAXIS_HYBRID )
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	    {
	      if ( vctsize > 0 )
		zaxisDefVct(zaxisID, vctsize, vct);
	      else
		Warning(func, "VCT missing");
	    }
	}

      nzaxis = vlistptr->nzaxis;
      vlistptr->zaxisIDs[nzaxis] = zaxisID;
      vlistptr->nzaxis++;
    }

  return (zaxisID);
}


/*
@Function  vlistCopyFlag
@Title     Copy some entries of a variable list

@Prototype void vlistCopyFlag(int vlistID2, int vlistID1)
@Parameter
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    @Item  vlistID2  Target variable list ID
    @Item  vlistID1  Source variable list ID
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@Description
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The function @func{vlistCopyFlag} copies all entries with a flag from vlistID1 to vlistID2.
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@EndFunction
*/
void vlistCopyFlag(int vlistID2, int vlistID1)
{
  static char func[] = "vlistCopyFlag";
  VLIST *vlistptr1, *vlistptr2;

  vlistptr1 = vlist_to_pointer(vlistID1);
  vlistptr2 = vlist_to_pointer(vlistID2);

  vlist_check_ptr(func, vlistptr1);
  vlist_check_ptr(func, vlistptr2);

  vlist_copy(vlistptr2, vlistptr1);
  
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  vlistCopyVarAtts(vlistID1, CDI_GLOBAL, vlistID2, CDI_GLOBAL);
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  if ( vlistptr1->vars )
    {
      int nvars = vlistptr1->nvars;
      int nvars2 = 0, levID2;
      int nlevs, nlevs2, levID, varID, varID2;
      int gridID, zaxisID;
      int index;

      vlistptr2->ngrids = 0;
      vlistptr2->nzaxis = 0;

      for ( varID = 0; varID < nvars; varID++ )
	if ( vlistptr1->vars[varID].flag ) nvars2++;

      vlistptr2->nvars = nvars2;
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      if ( nvars2 > 0 )
	vlistptr2->vars  = (VARINFO *) malloc(nvars2*sizeof(VARINFO));
      else
	vlistptr2->vars  = NULL;
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      varID2 = 0;
      for ( varID = 0; varID < nvars; varID++ )
	if ( vlistptr1->vars[varID].flag )
	  {
	    vlistptr2->vars[varID2].flag = FALSE;
	    zaxisID = vlistptr1->vars[varID].zaxisID;
	    gridID  = vlistptr1->vars[varID].gridID;

	    memcpy(&vlistptr2->vars[varID2], &vlistptr1->vars[varID], sizeof(VARINFO));

	    vlistptr1->vars[varID].fvarID = varID2;
	    vlistptr2->vars[varID2].fvarID = varID;

	    if ( vlistptr1->vars[varID].name )
	      vlistptr2->vars[varID2].name = strdupx(vlistptr1->vars[varID].name);

	    if ( vlistptr1->vars[varID].longname )
	      vlistptr2->vars[varID2].longname = strdupx(vlistptr1->vars[varID].longname);

	    if ( vlistptr1->vars[varID].stdname )
	      vlistptr2->vars[varID2].stdname = strdupx(vlistptr1->vars[varID].stdname);

	    if ( vlistptr1->vars[varID].units )
	      vlistptr2->vars[varID2].units = strdupx(vlistptr1->vars[varID].units);

	    nlevs  = vlistptr1->vars[varID].nlevs;
	    nlevs2 = 0;
	    for ( levID = 0; levID < nlevs; levID++ )
	      if ( vlistptr1->vars[varID].levinfo[levID].flag ) nlevs2++;

	    vlistptr2->vars[varID2].levinfo = (LEVINFO *) malloc(nlevs2*sizeof(LEVINFO));

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	    vlistptr2->vars[varID2].atts.nelems = 0;
	    vlistCopyVarAtts(vlistID1, varID, vlistID2, varID2);

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	    if ( nlevs != nlevs2 )
	      {
		int zaxisType;
		int zaxisID2;
		int nvct = 0;
		int lbounds;
		double *levels;
		double *levels2;
		const double *vct = NULL;

		zaxisID = vlistptr1->vars[varID].zaxisID;
		levels = (double *) malloc(nlevs2*sizeof(double));
		levID2 = 0;
		for ( levID = 0; levID < nlevs; levID++ )
		  if ( vlistptr1->vars[varID].levinfo[levID].flag )
		    {
		      vlistptr1->vars[varID].levinfo[levID].flevelID = levID2;
		      levels[levID2++] = zaxisInqLevel(zaxisID, levID);
		    }

		zaxisType = zaxisInqType(zaxisID);

		if ( zaxisType == ZAXIS_HYBRID )
		  {
		    nvct = zaxisInqVctSize(zaxisID);
		    vct  = zaxisInqVctPtr(zaxisID);
		  }
		lbounds = 0;     /* <------------ have to define */
		levels2 = NULL;  /* <------------ have to define */
		zaxisID2 = vlistInqZaxis(vlistID2, zaxisType, nlevs2, levels, lbounds, levels2, nvct, vct);

		free(levels);
		zaxisID = zaxisID2;
		vlistptr2->vars[varID2].zaxisID = zaxisID2;
		vlistptr2->vars[varID2].nlevs   = nlevs2;
	      }

	    for ( levID = 0; levID < nlevs2; levID++ )
	      {
		vlistptr2->vars[varID2].levinfo[levID].flag  = FALSE;
		vlistptr2->vars[varID2].levinfo[levID].index = -1;
	      }

	    levID2 = 0;
	    for ( levID = 0; levID < nlevs; levID++ )
	      if ( vlistptr1->vars[varID].levinfo[levID].flag )
		vlistptr2->vars[varID2].levinfo[levID2++].flevelID = levID;

	    for ( index = 0; index <vlistptr2->ngrids; index++ )
	      if (vlistptr2->gridIDs[index] == gridID ) break;

	    if ( index ==vlistptr2->ngrids )
	      {
		vlistptr2->gridIDs[vlistptr2->ngrids++] = gridID;
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		if (vlistptr2->ngrids >= MAX_GRIDS_PS )
		  Error(func, "Internal Problem! More than %d grids.", MAX_GRIDS_PS);
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	      }

	    for ( index = 0; index <vlistptr2->nzaxis; index++ )
	      if (vlistptr2->zaxisIDs[index] == zaxisID ) break;

	    if ( index ==vlistptr2->nzaxis )
	      {
		vlistptr2->zaxisIDs[vlistptr2->nzaxis++] = zaxisID;
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		if (vlistptr2->nzaxis >= MAX_ZAXIS_PS )
		  Error(func, "Internal Problem! More than %d zaxis.", MAX_ZAXIS_PS);
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	      }

	    varID2++;
	  }
    }
}


/*
@Function  vlistCat
@Title     Concatenate two variable lists

@Prototype void vlistCat(int vlistID2, int vlistID1)
@Parameter
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    @Item  vlistID2  Target variable list ID
    @Item  vlistID1  Source variable list ID
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@Description
Concatenate the variable list vlistID1 at the end of vlistID2.

@EndFunction
*/
void vlistCat(int vlistID2, int vlistID1)
{
  static char func[] = "vlistCat";
  int nvars, nvars1, nvars2;
  int varID, varID2, nlevs;
  int index, gridID, zaxisID;
  VLIST *vlistptr1, *vlistptr2;

  vlistptr1 = vlist_to_pointer(vlistID1);
  vlistptr2 = vlist_to_pointer(vlistID2);

  vlist_check_ptr(func, vlistptr1);
  vlist_check_ptr(func, vlistptr2);

  nvars1 = vlistptr1->nvars;
  nvars2 = vlistptr2->nvars;
  nvars = nvars1 + nvars2;
  vlistptr2->nvars = nvars;

  vlistptr2->vars = (VARINFO *) realloc(vlistptr2->vars, nvars*sizeof(VARINFO));
  memcpy(vlistptr2->vars+nvars2, vlistptr1->vars, nvars1*sizeof(VARINFO));

  for ( varID = 0; varID < nvars1; varID++ )
    {
      varID2 = varID + nvars2;
      vlistptr1->vars[varID].fvarID = varID2;
      vlistptr2->vars[varID2].fvarID = varID;

      if ( vlistptr1->vars[varID].name )
	vlistptr2->vars[varID2].name = strdupx(vlistptr1->vars[varID].name);

      if ( vlistptr1->vars[varID].longname )
	vlistptr2->vars[varID2].longname = strdupx(vlistptr1->vars[varID].longname);

      if ( vlistptr1->vars[varID].stdname )
	vlistptr2->vars[varID2].stdname = strdupx(vlistptr1->vars[varID].stdname);

      if ( vlistptr1->vars[varID].units )
	vlistptr2->vars[varID2].units = strdupx(vlistptr1->vars[varID].units);

      nlevs = vlistptr1->vars[varID].nlevs;
      vlistptr2->vars[varID2].levinfo = (LEVINFO *) malloc(nlevs*sizeof(LEVINFO));
      memcpy(vlistptr2->vars[varID2].levinfo, vlistptr1->vars[varID].levinfo, nlevs*sizeof(LEVINFO));

      gridID = vlistptr1->vars[varID].gridID;
      for ( index = 0; index < vlistptr2->ngrids; index++ )
	if ( gridID == vlistptr2->gridIDs[index] ) break;

      if ( index == vlistptr2->ngrids )
	{
	  vlistptr2->gridIDs[vlistptr2->ngrids++] = gridID;
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	  if ( vlistptr2->ngrids >= MAX_GRIDS_PS )
	    Error(func, "Internal Problem! More than %d grids.", MAX_GRIDS_PS);
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	}

      zaxisID = vlistptr1->vars[varID].zaxisID;
      for ( index = 0; index < vlistptr2->nzaxis; index++ )
	if ( zaxisID == vlistptr2->zaxisIDs[index] ) break;

      if ( index == vlistptr2->nzaxis )
	{
	  vlistptr2->zaxisIDs[vlistptr2->nzaxis++] = zaxisID;
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	  if ( vlistptr2->nzaxis >= MAX_ZAXIS_PS )
	    Error(func, "Internal Problem! More than %d zaxis.", MAX_ZAXIS_PS);
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	}
    }
}


/*
@Function  vlistMerge
@Title     Merge two variable lists

@Prototype void vlistMerge(int vlistID2, int vlistID1)
@Parameter
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    @Item  vlistID2  Target variable list ID
    @Item  vlistID1  Source variable list ID
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@Description
Merge the variable list vlistID1 and the variable list vlistID2.

@EndFunction
*/
void vlistMerge(int vlistID2, int vlistID1)
{
  static char func[] = "vlistMerge";
  int nvars1, nvars2;
  int varID = 0, varID2, levID, nlevs, nlevs1, nlevs2;
  int index, zaxisID;
  int zaxisID1, zaxisID2;
  int *lvar;
  double *levels;
  VLIST *vlistptr1, *vlistptr2;

  vlistptr1 = vlist_to_pointer(vlistID1);
  vlistptr2 = vlist_to_pointer(vlistID2);

  vlist_check_ptr(func, vlistptr1);
  vlist_check_ptr(func, vlistptr2);

  nvars1 = vlistptr1->nvars;
  nvars2 = vlistptr2->nvars;

  if ( nvars1 == nvars2 )
    {
      for ( varID = 0; varID < nvars2; varID++ )
	{
	  if ( vlistptr1->vars[varID].name && vlistptr2->vars[varID].name )
	    {
	      if ( strcmp(vlistptr1->vars[varID].name,
			  vlistptr2->vars[varID].name) != 0 ) break;
	    }
	  else
	    {
	      if ( vlistptr1->vars[varID].code != vlistptr2->vars[varID].code )
		break;
	    }
	}
    }

  if ( varID == nvars2 ) /* same variables in vlistID1 and vlistID2 */
    {
      for ( varID = 0; varID < nvars2; varID++ )
	{
	  vlistptr1->vars[varID].fvarID = varID;
	  vlistptr2->vars[varID].fvarID = varID;

	  nlevs1 = vlistptr1->vars[varID].nlevs;
	  nlevs2 = vlistptr2->vars[varID].nlevs;

	  nlevs = nlevs1 + nlevs2;

	  vlistptr2->vars[varID].nlevs = nlevs;

	  /* printf("var %d %d %d %d\n", varID, nlevs1, nlevs2, nlevs); */

	  vlistptr2->vars[varID].levinfo =
	    (LEVINFO *) realloc(vlistptr2->vars[varID].levinfo, nlevs*sizeof(LEVINFO));

	  memcpy(vlistptr2->vars[varID].levinfo+nlevs1,
		 vlistptr1->vars[varID].levinfo, nlevs2*sizeof(LEVINFO));
	}

      lvar = (int *) malloc(nvars2*sizeof(int));
      for ( varID = 0; varID < nvars2; varID++ ) lvar[varID] = FALSE;

      for ( varID = 0; varID < nvars2; varID++ )
	{
	  if ( lvar[varID] == TRUE ) continue;

	  zaxisID1 = vlistptr1->vars[varID].zaxisID;
	  zaxisID2 = vlistptr2->vars[varID].zaxisID;
	  /*
	  nlevs1 = vlistptr1->vars[varID].nlevs;
	  nlevs2 = vlistptr2->vars[varID].nlevs;
	  */
	  nlevs1 = zaxisInqSize(zaxisID1);
	  nlevs2 = zaxisInqSize(zaxisID2);

	  /* printf("zaxis %d %d %d %d\n", zaxisID1, zaxisID2, nlevs1, nlevs2); */

	  nlevs = nlevs1 + nlevs2;

	  zaxisID = zaxisDuplicate(zaxisID2);

	  zaxisResize(zaxisID, nlevs);

	  levels = (double *) malloc(nlevs1*sizeof(double));

	  zaxisInqLevels(zaxisID1, levels);

	  for ( levID = 0; levID < nlevs1; levID++ )
	    zaxisDefLevel(zaxisID, nlevs2+levID, levels[levID]);

	  free(levels);

	  for ( index = 0; index < vlistptr2->nzaxis; index++ )
	    if ( vlistptr2->zaxisIDs[index] == zaxisID2 )
	      vlistptr2->zaxisIDs[index] = zaxisID;

	  for ( varID2 = varID+1; varID2 < nvars1; varID2++ )
	    if ( vlistptr2->vars[varID2].zaxisID == zaxisID2 )
	      {
		vlistptr2->vars[varID2].zaxisID = zaxisID;
		lvar[varID2] = TRUE;
	      }
	}

      free(lvar);
    }
  else
    {
      vlistCat(vlistID2, vlistID1);
    }
}


/*
@Function  vlistNvars
@Title     Number of variables in a variable list

@Prototype int vlistNvars(int vlistID)
@Parameter
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    @Item  vlistID  Variable list ID, from a previous call to @fref{vlistCreate}
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@Description
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The function @func{vlistNvars} returns the number of variables in the variable list vlistID.
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@Result
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@func{vlistNvars} returns the number of variables in a variable list.
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@EndFunction
*/
int vlistNvars(int vlistID)
{
  static char func[] = "vlistNvars";
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  return (vlistptr->nvars);
}

int vlistNrecs(int vlistID)
{
  static char func[] = "vlistNrecs";
  int varID, nrecs = 0;
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  for ( varID = 0; varID < vlistptr->nvars; varID++ )
    nrecs +=  vlistptr->vars[varID].nlevs;

  return (nrecs);
}


/*
@Function  vlistNgrids
@Title     Number of grids in a variable list

@Prototype int vlistNgrids(int vlistID)
@Parameter
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@Description
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The function @func{vlistNgrids} returns the number of grids in the variable list vlistID.
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@Result
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@func{vlistNgrids} returns the number of grids in a variable list.
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@EndFunction
*/
int vlistNgrids(int vlistID)
{
  static char func[] = "vlistNgrids";
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  return (vlistptr->ngrids);
}


/*
@Function  vlistNzaxis
@Title     Number of zaxis in a variable list

@Prototype int vlistNzaxis(int vlistID)
@Parameter
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@Description
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The function @func{vlistNzaxis} returns the number of zaxis in the variable list vlistID.
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@Result
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@func{vlistNzaxis} returns the number of zaxis in a variable list.
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@EndFunction
*/
int vlistNzaxis(int vlistID)
{
  static char func[] = "vlistNzaxis";
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  return (vlistptr->nzaxis);
}


void vlistDefNtsteps(int vlistID, int nts)
{
  static char func[] = "vlistDefNtsteps";
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  vlistptr->ntsteps = nts;
}


int vlistNtsteps(int vlistID)
{
  static char func[] = "vlistNtsteps";
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  return (vlistptr->ntsteps);
}


void vlistPrint(int vlistID)
{
  static char func[] = "vlistPrint";
  int nvars, flag, index;
  int varID, fvarID, flevID, levID;
  int code, gridID, zaxisID, timeID, nlevs;
  int dtype;
  char *name, *longname, *units;
  double level;
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  printf("#\n# vlistID %d\n#\n", vlistID);

  if ( vlistID == CDI_UNDEFID ) return;

  nvars = vlistptr->nvars;

  printf("nvars   %d\n", nvars);
  printf("ngrids  %d\n", vlistptr->ngrids);
  printf("nzaxis  %d\n", vlistptr->nzaxis);
  printf("taxisID %d\n", vlistptr->taxisID);
  printf("instID  %d\n", vlistptr->instID);
  printf("modelID %d\n", vlistptr->modelID);
  printf("tableID %d\n", vlistptr->tableID);

  if ( nvars > 0 )
    {
      printf(" varID   code gridID zaxisID timeID nlevel flag  name     longname\n");
      for ( varID = 0; varID < nvars; varID++ )
	{
	  code     = vlistptr->vars[varID].code;
	  gridID   = vlistptr->vars[varID].gridID;
	  zaxisID  = vlistptr->vars[varID].zaxisID;
	  timeID   = vlistptr->vars[varID].timeID;
	  nlevs    = vlistptr->vars[varID].nlevs;
	  name     = vlistptr->vars[varID].name;
	  longname = vlistptr->vars[varID].longname;
	  units    = vlistptr->vars[varID].units;
	  flag     = vlistptr->vars[varID].flag;
	  printf("%6d %6d %6d %6d %6d %6d %5d  %-8s %s",
		 varID, code, gridID, zaxisID, timeID, nlevs, flag,
		 name ? name : "", longname ? longname : "");
	  if ( units ) printf("   [%s]", units);
	  printf("\n");
	}

      printf("\n");
      printf(" varID  levID fvarID flevID  index  dtype  flag  level\n");
      for ( varID = 0; varID < nvars; varID++ )
	{
	  nlevs    = vlistptr->vars[varID].nlevs;
	  zaxisID  = vlistptr->vars[varID].zaxisID;
	  fvarID   = vlistptr->vars[varID].fvarID;
	  dtype    = vlistptr->vars[varID].datatype;
	  for ( levID = 0; levID < nlevs; levID++ )
	    {
	      flevID = vlistptr->vars[varID].levinfo[levID].flevelID;
	      index  = vlistptr->vars[varID].levinfo[levID].index;
	      flag   = vlistptr->vars[varID].levinfo[levID].flag;
	      level  = zaxisInqLevel(zaxisID, levID);
	      printf("%6d %6d %6d %6d %6d %6d %5d  %.9g\n",
		     varID, levID, fvarID, flevID, index, dtype, flag, level);
	    }
	}
    }
}

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/*
@Function  vlistDefTaxis
@Title     Define the time axis

@Prototype void vlistDefTaxis(int vlistID, int taxisID)
@Parameter
    @Item  vlistID  Variable list ID, from a previous call to @fref{vlistCreate}
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    @Item  taxisID  Time axis ID, from a previous call to @fref{taxisCreate}
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@Description
The function @func{vlistDefTaxis} defines the time axis of a variable list.

@EndFunction
*/
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void vlistDefTaxis(int vlistID, int taxisID)
{
  static char func[] = "vlistDefTaxis";
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  vlistptr->taxisID = taxisID;
}

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/*
@Function  vlistInqTaxis
@Title     Get the time axis

@Prototype int vlistInqTaxis(int vlistID)
@Parameter
    @Item  vlistID  Variable list ID, from a previous call to @fref{vlistCreate}

@Description
The function @func{vlistInqTaxis} returns the time axis of a variable list.

@Result
@func{vlistInqTaxis} returns an identifier to the time axis.

@EndFunction
*/
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int vlistInqTaxis(int vlistID)
{
  static char func[] = "vlistInqTaxis";
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  return (vlistptr->taxisID);
}

void  vlistDefTable(int vlistID, int tableID)
{
  static char func[] = "vlistDefTable";
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  vlistptr->tableID = tableID;
}

int vlistInqTable(int vlistID)
{
  static char func[] = "vlistInqTable";
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  return (vlistptr->tableID);
}

void vlistDefInstitut(int vlistID, int instID)
{
  static char func[] = "vlistDefInstitut";
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  vlistptr->instID = instID;
}

int vlistInqInstitut(int vlistID)
{
  static char func[] = "vlistInqInstitut";
  int varID, instID;
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  instID = vlistptr->instID;

  if ( instID == CDI_UNDEFID )
    {
      instID  = vlistInqVarInstitut(vlistID, 0);

      for ( varID = 1; varID < vlistptr->nvars; varID++ )
	if ( instID != vlistInqVarInstitut(vlistID, varID) )
	  {
	    instID = CDI_UNDEFID;
	    break;
      }
      
      vlistDefInstitut(vlistID, instID);
    }

  return (instID);
}

void vlistDefModel(int vlistID, int modelID)
{
  static char func[] = "vlistDefModel";
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  vlistptr->modelID = modelID;
}

int vlistInqModel(int vlistID)
{
  static char func[] = "vlistInqModel";
  int varID, modelID;
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  modelID = vlistptr->modelID;

  if ( modelID == CDI_UNDEFID )
    {
      modelID = vlistInqVarModel(vlistID, 0);

      for ( varID = 1; varID < vlistptr->nvars; varID++ )
	if ( modelID != vlistInqVarModel(vlistID, varID) )
	  {
	    modelID = CDI_UNDEFID;
	    break;
	  }

      vlistDefModel(vlistID, modelID);
    }

  return (modelID);
}

int vlistGridsizeMax(int vlistID)
{
  static char func[] = "vlistGridsizeMax";
  int gridsize, gridsizemax = 0;
  int gridID, index;
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  for ( index = 0 ; index < vlistptr->ngrids ; index++ )
    {
      gridID = vlistptr->gridIDs[index];
      gridsize = gridInqSize(gridID);
      if ( gridsize > gridsizemax ) gridsizemax = gridsize;
    }
  
  return (gridsizemax);
}

int vlistGrid(int vlistID, int index)
{
  static char func[] = "vlistGrid";
  int gridID = CDI_UNDEFID;
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  if ( index < vlistptr->ngrids && index >= 0 )
    gridID = vlistptr->gridIDs[index];
  
  return (gridID);
}

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int vlistGridIndex(int vlistID, int gridID)
{
  static char func[] = "vlistGridIndex";
  int index;
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  for ( index = 0 ; index < vlistptr->ngrids ; index++ )
    if ( gridID == vlistptr->gridIDs[index] ) break;

  if ( index == vlistptr->ngrids ) index = -1;
  
  return (index);
}

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void vlistChangeGridIndex(int vlistID, int index, int gridID)
{
  static char func[] = "vlistChangeGridIndex";
  int gridIDold;
  int varID, nvars;
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  gridIDold = vlistptr->gridIDs[index];
  vlistptr->gridIDs[index] = gridID;

  nvars = vlistptr->nvars;
  for ( varID = 0; varID < nvars; varID++ )
    if ( vlistptr->vars[varID].gridID == gridIDold )
      vlistptr->vars[varID].gridID = gridID;
}

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void vlistChangeGrid(int vlistID, int gridID1, int gridID2)
{
  static char func[] = "vlistChangeGrid";
  int varID, nvars;
  int index, ngrids;
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  ngrids = vlistptr->ngrids;
  for ( index = 0; index < ngrids; index++ )
    {
      if ( vlistptr->gridIDs[index] == gridID1 )
	{
	  vlistptr->gridIDs[index] = gridID2;
	  break;
	}
    }

  nvars = vlistptr->nvars;
  for ( varID = 0; varID < nvars; varID++ )
    if ( vlistptr->vars[varID].gridID == gridID1 )
      vlistptr->vars[varID].gridID = gridID2;
}

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int vlistZaxis(int vlistID, int index)
{
  static char func[] = "vlistZaxis";
  int zaxisID = CDI_UNDEFID;
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  if ( index < vlistptr->nzaxis && index >= 0 )
    zaxisID = vlistptr->zaxisIDs[index];
  
  return (zaxisID);
}

int vlistZaxisIndex(int vlistID, int zaxisID)
{
  static char func[] = "vlistZaxisIndex";
  int index;
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  for ( index = 0 ; index < vlistptr->nzaxis ; index++ )
    if ( zaxisID == vlistptr->zaxisIDs[index] ) break;

  if ( index == vlistptr->nzaxis ) index = -1;
  
  return (index);
}

void vlistChangeZaxisIndex(int vlistID, int index, int zaxisID)
{
  static char func[] = "vlistChangeZaxisIndex";
  int zaxisIDold;
  int varID, nvars;
  int nlevs, levID;
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  zaxisIDold = vlistptr->zaxisIDs[index];
  vlistptr->zaxisIDs[index] = zaxisID;

  nvars = vlistptr->nvars;
  for ( varID = 0; varID < nvars; varID++ )
    if ( vlistptr->vars[varID].zaxisID == zaxisIDold )
      {
	vlistptr->vars[varID].zaxisID = zaxisID;

	nlevs = zaxisInqSize(zaxisID);
	if ( nlevs != vlistptr->vars[varID].nlevs )
	  {
	    vlistptr->vars[varID].nlevs   = nlevs;
	    vlistptr->vars[varID].levinfo = (LEVINFO *) realloc(vlistptr->vars[varID].levinfo,
								     nlevs*sizeof(LEVINFO));

	    for ( levID = 0; levID < nlevs; levID++ )
	      {
		vlistptr->vars[varID].levinfo[levID].flevelID = levID;
		vlistptr->vars[varID].levinfo[levID].index    = -1;
		vlistptr->vars[varID].levinfo[levID].flag     = FALSE;
	      }
	  }
      }
}

void vlistChangeZaxis(int vlistID, int zaxisID1, int zaxisID2)
{
  static char func[] = "vlistChangeZaxis";
  int varID, nvars;
  int index, nzaxis;
  int nlevs, levID;
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  nzaxis = vlistptr->nzaxis;
  for ( index = 0; index < nzaxis; index++ )
    {
      if ( vlistptr->zaxisIDs[index] == zaxisID1 )
	{
	  vlistptr->zaxisIDs[index] = zaxisID2;
	  break;
	}
    }

  nvars = vlistptr->nvars;
  for ( varID = 0; varID < nvars; varID++ )
    if ( vlistptr->vars[varID].zaxisID == zaxisID1 )
      {
	vlistptr->vars[varID].zaxisID = zaxisID2;

	nlevs = zaxisInqSize(zaxisID2);
	if ( nlevs != vlistptr->vars[varID].nlevs )
	  {
	    vlistptr->vars[varID].nlevs   = nlevs;
	    vlistptr->vars[varID].levinfo = (LEVINFO *) realloc(vlistptr->vars[varID].levinfo,
								     nlevs*sizeof(LEVINFO));

	    for ( levID = 0; levID < nlevs; levID++ )
	      {
		vlistptr->vars[varID].levinfo[levID].flevelID = levID;
		vlistptr->vars[varID].levinfo[levID].index    = -1;
		vlistptr->vars[varID].levinfo[levID].flag     = FALSE;
	      }
	  }
      }
}


int vlistHasTime(int vlistID)
{
  static char func[] = "vlistHasTime";
  int varID;
  int hastime = FALSE;
  VLIST *vlistptr;

  vlistptr = vlist_to_pointer(vlistID);

  vlist_check_ptr(func, vlistptr);

  for ( varID = 0; varID <  vlistptr->nvars; varID++ )
    if ( vlistptr->vars[varID].timeID == TIME_VARIABLE )
      {
	hastime = TRUE;
	break;
      }

  return (hastime);
}