/* Do not edit this file. It is produced from the corresponding .m4 source */
/*
 *  Copyright 1996, University Corporation for Atmospheric Research
 *      See netcdf/COPYRIGHT file for copying and redistribution conditions.
 */
/* Id */

#include "nc.h"
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include "ncx.h"
#include "fbits.h"
#include "rnd.h"


/*
 * Free attr
 * Formerly
NC_free_attr()
 */
void
free_NC_attr(NC_attr *attrp)
{

  if(attrp == NULL)
    return;
  free_NC_string(attrp->name);
  free(attrp);
}


/*
 * How much space will 'nelems' of 'type' take in
 *  external representation (as the values of an attribute)?
 */
static size_t
ncx_len_NC_attrV(nc_type type, size_t nelems)
{
  switch(type) {
  case NC_BYTE:
  case NC_CHAR:
    return ncx_len_char(nelems);
  case NC_SHORT:
    return ncx_len_short(nelems);
  case NC_INT:
    return ncx_len_int(nelems);
  case NC_FLOAT:
    return ncx_len_float(nelems);
  case NC_DOUBLE:
    return ncx_len_double(nelems);
  case NC_NAT:
    break;
  }
  /* default */
  assert("ncx_len_NC_attr bad type" == 0);
  return 0;
}


NC_attr *
new_x_NC_attr(
  NC_string *strp,
  nc_type type,
  size_t nelems)
{
  NC_attr *attrp;
  const size_t xsz = ncx_len_NC_attrV(type, nelems);
  size_t sz = M_RNDUP(sizeof(NC_attr));

  assert(!(xsz == 0 && nelems != 0));

  sz += xsz;

  attrp = (NC_attr *) malloc(sz);
  if(attrp == NULL )
    return NULL;

  attrp->xsz = xsz;

  attrp->name = strp;
  attrp->type = type;
  attrp->nelems = nelems;
  if(xsz != 0)
    attrp->xvalue = (char *)attrp + M_RNDUP(sizeof(NC_attr));
  else
    attrp->xvalue = NULL;

  return(attrp);
}


/*
 * Formerly
NC_new_attr(name,type,count,value)
 */
static NC_attr *
new_NC_attr(
  const char *name,
  nc_type type,
  size_t nelems)
{
  NC_string *strp;
  NC_attr *attrp;

  assert(name != NULL && *name != 0);

  strp = new_NC_string(strlen(name), name);
  if(strp == NULL)
    return NULL;
  
  attrp = new_x_NC_attr(strp, type, nelems);
  if(attrp == NULL)
  {
    free_NC_string(strp);
    return NULL;
  }

  return(attrp);
}


static NC_attr *
dup_NC_attr(const NC_attr *rattrp)
{
  NC_attr *attrp = new_NC_attr(rattrp->name->cp,
     rattrp->type, rattrp->nelems);
  if(attrp == NULL)
    return NULL;
  (void) memcpy(attrp->xvalue, rattrp->xvalue, rattrp->xsz);
  return attrp;
}

/* attrarray */

/*
 * Free the stuff "in" (referred to by) an NC_attrarray.
 * Leaves the array itself allocated.
 */
void
free_NC_attrarrayV0(NC_attrarray *ncap)
{
  assert(ncap != NULL);

  if(ncap->nelems == 0)
    return;

  assert(ncap->value != NULL);

  {
    NC_attr **app = ncap->value;
    NC_attr *const *const end = &app[ncap->nelems];
    for( /*NADA*/; app < end; app++)
    {
      free_NC_attr(*app);
      *app = NULL;
    }
  }
  ncap->nelems = 0;
}


/*
 * Free NC_attrarray values.
 * formerly
NC_free_array()
 */
void
free_NC_attrarrayV(NC_attrarray *ncap)
{
  assert(ncap != NULL);
  
  if(ncap->nalloc == 0)
    return;

  assert(ncap->value != NULL);

  free_NC_attrarrayV0(ncap);

  free(ncap->value);
  ncap->value = NULL;
  ncap->nalloc = 0;
}


int
dup_NC_attrarrayV(NC_attrarray *ncap, const NC_attrarray *ref)
{
  int status = NC_NOERR;

  assert(ref != NULL);
  assert(ncap != NULL);

  if(ref->nelems != 0)
  {
    const size_t sz = ref->nelems * sizeof(NC_attr *);
    ncap->value = (NC_attr **) malloc(sz);
    if(ncap->value == NULL)
      return NC_ENOMEM;

    (void) memset(ncap->value, 0, sz);
    ncap->nalloc = ref->nelems;
  }

  ncap->nelems = 0;
  {
    NC_attr **app = ncap->value;
    const NC_attr **drpp = (const NC_attr **)ref->value;
    NC_attr *const *const end = &app[ref->nelems];
    for( /*NADA*/; app < end; drpp++, app++, ncap->nelems++)
    {
      *app = dup_NC_attr(*drpp);
      if(*app == NULL)
      {
        status = NC_ENOMEM;
        break;
      }
    }
  }

  if(status != NC_NOERR)
  {
    free_NC_attrarrayV(ncap);
    return status;
  }

  assert(ncap->nelems == ref->nelems);

  return NC_NOERR;
}


/*
 * Add a new handle on the end of an array of handles
 * Formerly
NC_incr_array(array, tail)
 */
static int
incr_NC_attrarray(NC_attrarray *ncap, NC_attr *newelemp)
{
  NC_attr **vp;

  assert(ncap != NULL);

  if(ncap->nalloc == 0)
  {
    assert(ncap->nelems == 0);
    vp = (NC_attr **) malloc(NC_ARRAY_GROWBY * sizeof(NC_attr *));
    if(vp == NULL)
      return NC_ENOMEM;

    ncap->value = vp;
    ncap->nalloc = NC_ARRAY_GROWBY;
  }
  else if(ncap->nelems +1 > ncap->nalloc)
  {
    vp = (NC_attr **) realloc(ncap->value,
      (ncap->nalloc + NC_ARRAY_GROWBY) * sizeof(NC_attr *));
    if(vp == NULL)
      return NC_ENOMEM;
  
    ncap->value = vp;
    ncap->nalloc += NC_ARRAY_GROWBY;
  }

  if(newelemp != NULL)
  {
    ncap->value[ncap->nelems] = newelemp;
    ncap->nelems++;
  }
  return NC_NOERR;
}


NC_attr *
elem_NC_attrarray(const NC_attrarray *ncap, size_t elem)
{
  assert(ncap != NULL);
    /* cast needed for braindead systems with signed size_t */
  if(ncap->nelems == 0 || (unsigned long) elem >= ncap->nelems)
    return NULL;

  assert(ncap->value != NULL);

  return ncap->value[elem];
}

/* End attarray per se */

/*
 * Given ncp and varid, return ptr to array of attributes
 *  else NULL on error
 */
static NC_attrarray *
NC_attrarray0( NC *ncp, int varid)
{
  NC_attrarray *ap;

  if(varid == NC_GLOBAL) /* Global attribute, attach to cdf */
  {
    ap = &ncp->attrs;
  }
  else if(varid >= 0 && (size_t) varid < ncp->vars.nelems)
  {
    NC_var **vpp;
    vpp = (NC_var **)ncp->vars.value;
    vpp += varid;
    ap = &(*vpp)->attrs;
  } else {
    ap = NULL;
  }
  return(ap);
}


/*
 * Step thru NC_ATTRIBUTE array, seeking match on name.
 *  return match or NULL if Not Found.
 */
NC_attr **
NC_findattr(const NC_attrarray *ncap, const char *name)
{
  NC_attr **attrpp;
  size_t attrid;
  size_t slen;

  assert(ncap != NULL);

  if(ncap->nelems == 0)
    return NULL;

  attrpp = (NC_attr **) ncap->value;

  slen = strlen(name);

  for(attrid = 0; attrid < ncap->nelems; attrid++, attrpp++)
  {
    if(strlen((*attrpp)->name->cp) == slen &&
      strncmp((*attrpp)->name->cp, name, slen) == 0)
    {
      return(attrpp); /* Normal return */
    }
  }
  return(NULL);
}


/*
 * Look up by ncid, varid and name, return NULL if not found
 */
static int 
NC_lookupattr(int ncid,
  int varid,
  const char *name, /* attribute name */
  NC_attr **attrpp) /* modified on return */
{
  int status;
  NC *ncp;
  NC_attrarray *ncap;
  NC_attr **tmp;

  status = NC_check_id(ncid, &ncp);
  if(status != NC_NOERR)
    return status;

  ncap = NC_attrarray0(ncp, varid);
  if(ncap == NULL)
    return NC_ENOTVAR;

  tmp = NC_findattr(ncap, name);
  if(tmp == NULL)
    return NC_ENOTATT;

  if(attrpp != NULL)
    *attrpp = *tmp;

  return ENOERR;
}

/* Public */

int
nc_inq_attname(int ncid, int varid, int attnum, char *name)
{
  int status;
  NC *ncp;
  NC_attrarray *ncap;
  NC_attr *attrp;

  status = NC_check_id(ncid, &ncp);
  if(status != NC_NOERR)
    return status;

  ncap = NC_attrarray0(ncp, varid);
  if(ncap == NULL)
    return NC_ENOTVAR;

  attrp = elem_NC_attrarray(ncap, (size_t)attnum);
  if(attrp == NULL)
    return NC_ENOTATT;

  (void) strncpy(name, attrp->name->cp, attrp->name->nchars);
  name[attrp->name->nchars] = 0;

  return NC_NOERR;
}


int 
nc_inq_attid(int ncid, int varid, const char *name, int *attnump)
{
  int status;
  NC *ncp;
  NC_attrarray *ncap;
  NC_attr **attrpp;

  status = NC_check_id(ncid, &ncp);
  if(status != NC_NOERR)
    return status;

  ncap = NC_attrarray0(ncp, varid);
  if(ncap == NULL)
    return NC_ENOTVAR;
  

  attrpp = NC_findattr(ncap, name);
  if(attrpp == NULL)
    return NC_ENOTATT;

  if(attnump != NULL)
    *attnump = (int)(attrpp - ncap->value);

  return NC_NOERR;
}

int 
nc_inq_atttype(int ncid, int varid, const char *name, nc_type *datatypep)
{
  int status;
  NC_attr *attrp;

  status = NC_lookupattr(ncid, varid, name, &attrp);
  if(status != NC_NOERR)
    return status;

  if(datatypep != NULL)
    *datatypep = attrp->type;

  return NC_NOERR;
}

int 
nc_inq_attlen(int ncid, int varid, const char *name, size_t *lenp)
{
  int status;
  NC_attr *attrp;

  status = NC_lookupattr(ncid, varid, name, &attrp);
  if(status != NC_NOERR)
    return status;

  if(lenp != NULL)
    *lenp = attrp->nelems;

  return NC_NOERR;
}

int
nc_inq_att(int ncid,
  int varid,
  const char *name, /* input, attribute name */
  nc_type *datatypep,
  size_t *lenp)
{
  int status;
  NC_attr *attrp;

  status = NC_lookupattr(ncid, varid, name, &attrp);
  if(status != NC_NOERR)
    return status;

  if(datatypep != NULL)
    *datatypep = attrp->type;
  if(lenp != NULL)
    *lenp = attrp->nelems;

  return NC_NOERR;
}


int
nc_rename_att( int ncid, int varid, const char *name, const char *newname)
{
  int status;
  NC *ncp;
  NC_attrarray *ncap;
  NC_attr **tmp;
  NC_attr *attrp;
  NC_string *newStr, *old;

      /* sortof inline clone of NC_lookupattr() */
  status = NC_check_id(ncid, &ncp);
  if(status != NC_NOERR)
    return status;

  if(NC_readonly(ncp))
    return NC_EPERM;

  ncap = NC_attrarray0(ncp, varid);
  if(ncap == NULL)
    return NC_ENOTVAR;

  status = NC_check_name(newname);
  if(status != NC_NOERR)
    return status;

  tmp = NC_findattr(ncap, name);
  if(tmp == NULL)
    return NC_ENOTATT;
  attrp = *tmp;
      /* end inline clone NC_lookupattr() */

  if(NC_findattr(ncap, newname) != NULL)
  {
    /* name in use */
    return NC_ENAMEINUSE;
  }

  old = attrp->name;
  if(NC_indef(ncp))
  {
    newStr = new_NC_string(strlen(newname), newname);
    if( newStr == NULL)
      return NC_ENOMEM;
    attrp->name = newStr;
    free_NC_string(old);
    return NC_NOERR;
  }
  /* else */
  status = set_NC_string(old, newname);
  if( status != NC_NOERR)
    return status;

  set_NC_hdirty(ncp);

  if(NC_doHsync(ncp))
  {
    status = NC_sync(ncp);
    if(status != NC_NOERR)
      return status;
  }

  return NC_NOERR;
}


int
nc_copy_att(int ncid_in, int varid_in, const char *name, int ncid_out, int ovarid)
{
  int status;
  NC_attr *iattrp;
  NC *ncp;
  NC_attrarray *ncap;
  NC_attr **attrpp;
  NC_attr *old = NULL;
  NC_attr *attrp;

  status = NC_lookupattr(ncid_in, varid_in, name, &iattrp);
  if(status != NC_NOERR)
    return status;

  status = NC_check_id(ncid_out, &ncp);
  if(status != NC_NOERR)
    return status;

  if(NC_readonly(ncp))
    return NC_EPERM;

  ncap = NC_attrarray0(ncp, ovarid);
  if(ncap == NULL)
    return NC_ENOTVAR;

  attrpp = NC_findattr(ncap, name);
  if(attrpp != NULL) /* name in use */
  {
    if(!NC_indef(ncp) )
    {
      attrp = *attrpp; /* convenience */
  
      if(iattrp->xsz > attrp->xsz)
        return NC_ENOTINDEFINE;
      /* else, we can reuse existing without redef */
      
      attrp->xsz = iattrp->xsz;
      attrp->type = iattrp->type;
      attrp->nelems = iattrp->nelems;

      (void) memcpy(attrp->xvalue, iattrp->xvalue,
        iattrp->xsz);
      
      set_NC_hdirty(ncp);

      if(NC_doHsync(ncp))
      {
        status = NC_sync(ncp);
        if(status != NC_NOERR)
          return status;
      }

      return NC_NOERR;
    }
    /* else, redefine using existing array slot */
    old = *attrpp;
  } 
  else
  {
    if(!NC_indef(ncp))
      return NC_ENOTINDEFINE;

    if(ncap->nelems >= NC_MAX_ATTRS)
      return NC_EMAXATTS;
  }

  attrp = new_NC_attr(name, iattrp->type, iattrp->nelems);
  if(attrp == NULL)
    return NC_ENOMEM;

  (void) memcpy(attrp->xvalue, iattrp->xvalue,
    iattrp->xsz);

  if(attrpp != NULL)
  {
    assert(old != NULL);
    *attrpp = attrp;
    free_NC_attr(old);
  }
  else
  {
    status = incr_NC_attrarray(ncap, attrp);
    if(status != NC_NOERR)
    {
      free_NC_attr(attrp);
      return status;
    }
  }

  return NC_NOERR;
}


int
nc_del_att(int ncid, int varid, const char *name)
{
  int status;
  NC *ncp;
  NC_attrarray *ncap;
  NC_attr **attrpp;
  NC_attr *old = NULL;
  int attrid;
  size_t slen;

  status = NC_check_id(ncid, &ncp);
  if(status != NC_NOERR)
    return status;

  if(!NC_indef(ncp))
    return NC_ENOTINDEFINE;

  ncap = NC_attrarray0(ncp, varid);
  if(ncap == NULL)
    return NC_ENOTVAR;

      /* sortof inline NC_findattr() */
  slen = strlen(name);

  attrpp = (NC_attr **) ncap->value;
  for(attrid = 0; (size_t) attrid < ncap->nelems; attrid++, attrpp++)
  {
    if( slen == (*attrpp)->name->nchars &&
      strncmp(name, (*attrpp)->name->cp, slen) == 0)
    {
      old = *attrpp;
      break;
    }
  }
  if( (size_t) attrid == ncap->nelems )
    return NC_ENOTATT;
      /* end inline NC_findattr() */

  /* shuffle down */
  for(attrid++; (size_t) attrid < ncap->nelems; attrid++)
  {
    *attrpp = *(attrpp + 1);
    attrpp++;
  }
  *attrpp = NULL;
  /* decrement count */
  ncap->nelems--;

  free_NC_attr(old);

  return NC_NOERR;
}


static int
ncx_pad_putn_Iuchar(void **xpp, size_t nelems, const uchar *tp, nc_type type)
{
  switch(type) {
  case NC_CHAR:
    return NC_ECHAR;
  case NC_BYTE:
    return ncx_pad_putn_schar_uchar(xpp, nelems, tp);
  case NC_SHORT:
    return ncx_pad_putn_short_uchar(xpp, nelems, tp);
  case NC_INT:
    return ncx_putn_int_uchar(xpp, nelems, tp);
  case NC_FLOAT:
    return ncx_putn_float_uchar(xpp, nelems, tp);
  case NC_DOUBLE:
    return ncx_putn_double_uchar(xpp, nelems, tp);
  case NC_NAT:
    break;
  }
  assert("ncx_pad_putn_Iuchar invalid type" == 0);
  return NC_EBADTYPE;
}

static int
ncx_pad_getn_Iuchar(const void **xpp, size_t nelems, uchar *tp, nc_type type)
{
  switch(type) {
  case NC_CHAR:
    return NC_ECHAR;
  case NC_BYTE:
    return ncx_pad_getn_schar_uchar(xpp, nelems, tp);
  case NC_SHORT:
    return ncx_pad_getn_short_uchar(xpp, nelems, tp);
  case NC_INT:
    return ncx_getn_int_uchar(xpp, nelems, tp);
  case NC_FLOAT:
    return ncx_getn_float_uchar(xpp, nelems, tp);
  case NC_DOUBLE:
    return ncx_getn_double_uchar(xpp, nelems, tp);
  case NC_NAT:
    break;
  }
  assert("ncx_pad_getn_Iuchar invalid type" == 0);
  return NC_EBADTYPE;
}


static int
ncx_pad_putn_Ischar(void **xpp, size_t nelems, const schar *tp, nc_type type)
{
  switch(type) {
  case NC_CHAR:
    return NC_ECHAR;
  case NC_BYTE:
    return ncx_pad_putn_schar_schar(xpp, nelems, tp);
  case NC_SHORT:
    return ncx_pad_putn_short_schar(xpp, nelems, tp);
  case NC_INT:
    return ncx_putn_int_schar(xpp, nelems, tp);
  case NC_FLOAT:
    return ncx_putn_float_schar(xpp, nelems, tp);
  case NC_DOUBLE:
    return ncx_putn_double_schar(xpp, nelems, tp);
  case NC_NAT:
    break;
  }
  assert("ncx_pad_putn_Ischar invalid type" == 0);
  return NC_EBADTYPE;
}

static int
ncx_pad_getn_Ischar(const void **xpp, size_t nelems, schar *tp, nc_type type)
{
  switch(type) {
  case NC_CHAR:
    return NC_ECHAR;
  case NC_BYTE:
    return ncx_pad_getn_schar_schar(xpp, nelems, tp);
  case NC_SHORT:
    return ncx_pad_getn_short_schar(xpp, nelems, tp);
  case NC_INT:
    return ncx_getn_int_schar(xpp, nelems, tp);
  case NC_FLOAT:
    return ncx_getn_float_schar(xpp, nelems, tp);
  case NC_DOUBLE:
    return ncx_getn_double_schar(xpp, nelems, tp);
  case NC_NAT:
    break;
  }
  assert("ncx_pad_getn_Ischar invalid type" == 0);
  return NC_EBADTYPE;
}


static int
ncx_pad_putn_Ishort(void **xpp, size_t nelems, const short *tp, nc_type type)
{
  switch(type) {
  case NC_CHAR:
    return NC_ECHAR;
  case NC_BYTE:
    return ncx_pad_putn_schar_short(xpp, nelems, tp);
  case NC_SHORT:
    return ncx_pad_putn_short_short(xpp, nelems, tp);
  case NC_INT:
    return ncx_putn_int_short(xpp, nelems, tp);
  case NC_FLOAT:
    return ncx_putn_float_short(xpp, nelems, tp);
  case NC_DOUBLE:
    return ncx_putn_double_short(xpp, nelems, tp);
  case NC_NAT:
    break;
  }
  assert("ncx_pad_putn_Ishort invalid type" == 0);
  return NC_EBADTYPE;
}

static int
ncx_pad_getn_Ishort(const void **xpp, size_t nelems, short *tp, nc_type type)
{
  switch(type) {
  case NC_CHAR:
    return NC_ECHAR;
  case NC_BYTE:
    return ncx_pad_getn_schar_short(xpp, nelems, tp);
  case NC_SHORT:
    return ncx_pad_getn_short_short(xpp, nelems, tp);
  case NC_INT:
    return ncx_getn_int_short(xpp, nelems, tp);
  case NC_FLOAT:
    return ncx_getn_float_short(xpp, nelems, tp);
  case NC_DOUBLE:
    return ncx_getn_double_short(xpp, nelems, tp);
  case NC_NAT:
    break;
  }
  assert("ncx_pad_getn_Ishort invalid type" == 0);
  return NC_EBADTYPE;
}


static int
ncx_pad_putn_Iint(void **xpp, size_t nelems, const int *tp, nc_type type)
{
  switch(type) {
  case NC_CHAR:
    return NC_ECHAR;
  case NC_BYTE:
    return ncx_pad_putn_schar_int(xpp, nelems, tp);
  case NC_SHORT:
    return ncx_pad_putn_short_int(xpp, nelems, tp);
  case NC_INT:
    return ncx_putn_int_int(xpp, nelems, tp);
  case NC_FLOAT:
    return ncx_putn_float_int(xpp, nelems, tp);
  case NC_DOUBLE:
    return ncx_putn_double_int(xpp, nelems, tp);
  case NC_NAT:
    break;
  }
  assert("ncx_pad_putn_Iint invalid type" == 0);
  return NC_EBADTYPE;
}

static int
ncx_pad_getn_Iint(const void **xpp, size_t nelems, int *tp, nc_type type)
{
  switch(type) {
  case NC_CHAR:
    return NC_ECHAR;
  case NC_BYTE:
    return ncx_pad_getn_schar_int(xpp, nelems, tp);
  case NC_SHORT:
    return ncx_pad_getn_short_int(xpp, nelems, tp);
  case NC_INT:
    return ncx_getn_int_int(xpp, nelems, tp);
  case NC_FLOAT:
    return ncx_getn_float_int(xpp, nelems, tp);
  case NC_DOUBLE:
    return ncx_getn_double_int(xpp, nelems, tp);
  case NC_NAT:
    break;
  }
  assert("ncx_pad_getn_Iint invalid type" == 0);
  return NC_EBADTYPE;
}


static int
ncx_pad_putn_Ilong(void **xpp, size_t nelems, const long *tp, nc_type type)
{
  switch(type) {
  case NC_CHAR:
    return NC_ECHAR;
  case NC_BYTE:
    return ncx_pad_putn_schar_long(xpp, nelems, tp);
  case NC_SHORT:
    return ncx_pad_putn_short_long(xpp, nelems, tp);
  case NC_INT:
    return ncx_putn_int_long(xpp, nelems, tp);
  case NC_FLOAT:
    return ncx_putn_float_long(xpp, nelems, tp);
  case NC_DOUBLE:
    return ncx_putn_double_long(xpp, nelems, tp);
  case NC_NAT:
    break;
  }
  assert("ncx_pad_putn_Ilong invalid type" == 0);
  return NC_EBADTYPE;
}

static int
ncx_pad_getn_Ilong(const void **xpp, size_t nelems, long *tp, nc_type type)
{
  switch(type) {
  case NC_CHAR:
    return NC_ECHAR;
  case NC_BYTE:
    return ncx_pad_getn_schar_long(xpp, nelems, tp);
  case NC_SHORT:
    return ncx_pad_getn_short_long(xpp, nelems, tp);
  case NC_INT:
    return ncx_getn_int_long(xpp, nelems, tp);
  case NC_FLOAT:
    return ncx_getn_float_long(xpp, nelems, tp);
  case NC_DOUBLE:
    return ncx_getn_double_long(xpp, nelems, tp);
  case NC_NAT:
    break;
  }
  assert("ncx_pad_getn_Ilong invalid type" == 0);
  return NC_EBADTYPE;
}


static int
ncx_pad_putn_Ifloat(void **xpp, size_t nelems, const float *tp, nc_type type)
{
  switch(type) {
  case NC_CHAR:
    return NC_ECHAR;
  case NC_BYTE:
    return ncx_pad_putn_schar_float(xpp, nelems, tp);
  case NC_SHORT:
    return ncx_pad_putn_short_float(xpp, nelems, tp);
  case NC_INT:
    return ncx_putn_int_float(xpp, nelems, tp);
  case NC_FLOAT:
    return ncx_putn_float_float(xpp, nelems, tp);
  case NC_DOUBLE:
    return ncx_putn_double_float(xpp, nelems, tp);
  case NC_NAT:
    break;
  }
  assert("ncx_pad_putn_Ifloat invalid type" == 0);
  return NC_EBADTYPE;
}

static int
ncx_pad_getn_Ifloat(const void **xpp, size_t nelems, float *tp, nc_type type)
{
  switch(type) {
  case NC_CHAR:
    return NC_ECHAR;
  case NC_BYTE:
    return ncx_pad_getn_schar_float(xpp, nelems, tp);
  case NC_SHORT:
    return ncx_pad_getn_short_float(xpp, nelems, tp);
  case NC_INT:
    return ncx_getn_int_float(xpp, nelems, tp);
  case NC_FLOAT:
    return ncx_getn_float_float(xpp, nelems, tp);
  case NC_DOUBLE:
    return ncx_getn_double_float(xpp, nelems, tp);
  case NC_NAT:
    break;
  }
  assert("ncx_pad_getn_Ifloat invalid type" == 0);
  return NC_EBADTYPE;
}


static int
ncx_pad_putn_Idouble(void **xpp, size_t nelems, const double *tp, nc_type type)
{
  switch(type) {
  case NC_CHAR:
    return NC_ECHAR;
  case NC_BYTE:
    return ncx_pad_putn_schar_double(xpp, nelems, tp);
  case NC_SHORT:
    return ncx_pad_putn_short_double(xpp, nelems, tp);
  case NC_INT:
    return ncx_putn_int_double(xpp, nelems, tp);
  case NC_FLOAT:
    return ncx_putn_float_double(xpp, nelems, tp);
  case NC_DOUBLE:
    return ncx_putn_double_double(xpp, nelems, tp);
  case NC_NAT:
    break;
  }
  assert("ncx_pad_putn_Idouble invalid type" == 0);
  return NC_EBADTYPE;
}

static int
ncx_pad_getn_Idouble(const void **xpp, size_t nelems, double *tp, nc_type type)
{
  switch(type) {
  case NC_CHAR:
    return NC_ECHAR;
  case NC_BYTE:
    return ncx_pad_getn_schar_double(xpp, nelems, tp);
  case NC_SHORT:
    return ncx_pad_getn_short_double(xpp, nelems, tp);
  case NC_INT:
    return ncx_getn_int_double(xpp, nelems, tp);
  case NC_FLOAT:
    return ncx_getn_float_double(xpp, nelems, tp);
  case NC_DOUBLE:
    return ncx_getn_double_double(xpp, nelems, tp);
  case NC_NAT:
    break;
  }
  assert("ncx_pad_getn_Idouble invalid type" == 0);
  return NC_EBADTYPE;
}



int
nc_put_att_text(int ncid, int varid, const char *name,
  size_t nelems, const char *value)
{
  int status;
  NC *ncp;
  NC_attrarray *ncap;
  NC_attr **attrpp;
  NC_attr *old = NULL;
  NC_attr *attrp;

  status = NC_check_id(ncid, &ncp);
  if(status != NC_NOERR)
    return status;

  if(NC_readonly(ncp))
    return NC_EPERM;

  ncap = NC_attrarray0(ncp, varid);
  if(ncap == NULL)
    return NC_ENOTVAR;

  status = NC_check_name(name);
  if(status != NC_NOERR)
    return status;

    /* cast needed for braindead systems with signed size_t */
  if((unsigned long) nelems > X_INT_MAX) /* backward compat */
    return NC_EINVAL; /* Invalid nelems */

  if(nelems != 0 && value == NULL)
    return NC_EINVAL; /* Null arg */

  attrpp = NC_findattr(ncap, name);
  if(attrpp != NULL) /* name in use */
  {
    if(!NC_indef(ncp) )
    {
      const size_t xsz = ncx_len_NC_attrV(NC_CHAR, nelems);
      attrp = *attrpp; /* convenience */
  
      if(xsz > attrp->xsz)
        return NC_ENOTINDEFINE;
      /* else, we can reuse existing without redef */
      
      attrp->xsz = xsz;
      attrp->type = NC_CHAR;
      attrp->nelems = nelems;

      if(nelems != 0)
      {
        void *xp = attrp->xvalue;
        status = ncx_pad_putn_text(&xp, nelems, value);
        if(status != NC_NOERR)
          return status;
      }
      
      set_NC_hdirty(ncp);

      if(NC_doHsync(ncp))
      {
        status = NC_sync(ncp);
        if(status != NC_NOERR)
          return status;
      }

      return NC_NOERR;
    }
    /* else, redefine using existing array slot */
    old = *attrpp;
  } 
  else
  {
    if(!NC_indef(ncp))
      return NC_ENOTINDEFINE;

    if(ncap->nelems >= NC_MAX_ATTRS)
      return NC_EMAXATTS;
  }

  attrp = new_NC_attr(name, NC_CHAR, nelems);
  if(attrp == NULL)
    return NC_ENOMEM;

  if(nelems != 0)
  {
    void *xp = attrp->xvalue;
    status = ncx_pad_putn_text(&xp, nelems, value);
    if(status != NC_NOERR)
      return status;
  }

  if(attrpp != NULL)
  {
    assert(old != NULL);
    *attrpp = attrp;
    free_NC_attr(old);
  }
  else
  {
    status = incr_NC_attrarray(ncap, attrp);
    if(status != NC_NOERR)
    {
      free_NC_attr(attrp);
      return status;
    }
  }

  return NC_NOERR;
}


int
nc_get_att_text(int ncid, int varid, const char *name, char *str)
{
  int status;
  NC_attr *attrp;

  status = NC_lookupattr(ncid, varid, name, &attrp);
  if(status != NC_NOERR)
    return status;

  if(attrp->nelems == 0)
    return NC_NOERR;

  if(attrp->type != NC_CHAR)
    return NC_ECHAR;

  /* else */
  {
    const void *xp = attrp->xvalue;
    return ncx_pad_getn_text(&xp, attrp->nelems, str);
  }
}




int
nc_put_att_schar(int ncid, int varid, const char *name,
  nc_type type, size_t nelems, const signed char *value)
{
  int status;
  NC *ncp;
  NC_attrarray *ncap;
  NC_attr **attrpp;
  NC_attr *old = NULL;
  NC_attr *attrp;

  status = NC_check_id(ncid, &ncp);
  if(status != NC_NOERR)
    return status;

  if(NC_readonly(ncp))
    return NC_EPERM;

  ncap = NC_attrarray0(ncp, varid);
  if(ncap == NULL)
    return NC_ENOTVAR;

  status = nc_cktype(type);
  if(status != NC_NOERR)
    return status;

  if(type == NC_CHAR)
    return NC_ECHAR;

    /* cast needed for braindead systems with signed size_t */
  if((unsigned long) nelems > X_INT_MAX) /* backward compat */
    return NC_EINVAL; /* Invalid nelems */

  if(nelems != 0 && value == NULL)
    return NC_EINVAL; /* Null arg */

  attrpp = NC_findattr(ncap, name);
  if(attrpp != NULL) /* name in use */
  {
    if(!NC_indef(ncp) )
    {
      const size_t xsz = ncx_len_NC_attrV(type, nelems);
      attrp = *attrpp; /* convenience */
  
      if(xsz > attrp->xsz)
        return NC_ENOTINDEFINE;
      /* else, we can reuse existing without redef */
      
      attrp->xsz = xsz;
      attrp->type = type;
      attrp->nelems = nelems;

      if(nelems != 0)
      {
        void *xp = attrp->xvalue;
        status = ncx_pad_putn_Ischar(&xp, nelems,
          value, type);
      }
      
      set_NC_hdirty(ncp);

      if(NC_doHsync(ncp))
      {
        const int lstatus = NC_sync(ncp);
        /*
         * N.B.: potentially overrides NC_ERANGE
         * set by ncx_pad_putn_Ischar
         */
        if(lstatus != ENOERR)
          return lstatus;
      }

      return status;
    }
    /* else, redefine using existing array slot */
    old = *attrpp;
  } 
  else
  {
    if(!NC_indef(ncp))
      return NC_ENOTINDEFINE;

    if(ncap->nelems >= NC_MAX_ATTRS)
      return NC_EMAXATTS;
  }

  status = NC_check_name(name);
  if(status != NC_NOERR)
    return status;

  attrp = new_NC_attr(name, type, nelems);
  if(attrp == NULL)
    return NC_ENOMEM;

  if(nelems != 0)
  {
    void *xp = attrp->xvalue;
    status = ncx_pad_putn_Ischar(&xp, nelems,
      value, type);
  }

  if(attrpp != NULL)
  {
    assert(old != NULL);
    *attrpp = attrp;
    free_NC_attr(old);
  }
  else
  {
    const int lstatus = incr_NC_attrarray(ncap, attrp);
    /*
     * N.B.: potentially overrides NC_ERANGE
     * set by ncx_pad_putn_Ischar
     */
    if(lstatus != NC_NOERR)
    {
      free_NC_attr(attrp);
      return lstatus;
    }
  }

  return status;
}

int
nc_get_att_schar(int ncid, int varid, const char *name, signed char *tp)
{
  int status;
  NC_attr *attrp;

  status = NC_lookupattr(ncid, varid, name, &attrp);
  if(status != NC_NOERR)
    return status;

  if(attrp->nelems == 0)
    return NC_NOERR;

  if(attrp->type == NC_CHAR)
    return NC_ECHAR;

  {
  const void *xp = attrp->xvalue;
  return ncx_pad_getn_Ischar(&xp, attrp->nelems, tp, attrp->type);
  }
}


int
nc_put_att_uchar(int ncid, int varid, const char *name,
  nc_type type, size_t nelems, const unsigned char *value)
{
  int status;
  NC *ncp;
  NC_attrarray *ncap;
  NC_attr **attrpp;
  NC_attr *old = NULL;
  NC_attr *attrp;

  status = NC_check_id(ncid, &ncp);
  if(status != NC_NOERR)
    return status;

  if(NC_readonly(ncp))
    return NC_EPERM;

  ncap = NC_attrarray0(ncp, varid);
  if(ncap == NULL)
    return NC_ENOTVAR;

  status = nc_cktype(type);
  if(status != NC_NOERR)
    return status;

  if(type == NC_CHAR)
    return NC_ECHAR;

    /* cast needed for braindead systems with signed size_t */
  if((unsigned long) nelems > X_INT_MAX) /* backward compat */
    return NC_EINVAL; /* Invalid nelems */

  if(nelems != 0 && value == NULL)
    return NC_EINVAL; /* Null arg */

  attrpp = NC_findattr(ncap, name);
  if(attrpp != NULL) /* name in use */
  {
    if(!NC_indef(ncp) )
    {
      const size_t xsz = ncx_len_NC_attrV(type, nelems);
      attrp = *attrpp; /* convenience */
  
      if(xsz > attrp->xsz)
        return NC_ENOTINDEFINE;
      /* else, we can reuse existing without redef */
      
      attrp->xsz = xsz;
      attrp->type = type;
      attrp->nelems = nelems;

      if(nelems != 0)
      {
        void *xp = attrp->xvalue;
        status = ncx_pad_putn_Iuchar(&xp, nelems,
          value, type);
      }
      
      set_NC_hdirty(ncp);

      if(NC_doHsync(ncp))
      {
        const int lstatus = NC_sync(ncp);
        /*
         * N.B.: potentially overrides NC_ERANGE
         * set by ncx_pad_putn_Iuchar
         */
        if(lstatus != ENOERR)
          return lstatus;
      }

      return status;
    }
    /* else, redefine using existing array slot */
    old = *attrpp;
  } 
  else
  {
    if(!NC_indef(ncp))
      return NC_ENOTINDEFINE;

    if(ncap->nelems >= NC_MAX_ATTRS)
      return NC_EMAXATTS;
  }

  status = NC_check_name(name);
  if(status != NC_NOERR)
    return status;

  attrp = new_NC_attr(name, type, nelems);
  if(attrp == NULL)
    return NC_ENOMEM;

  if(nelems != 0)
  {
    void *xp = attrp->xvalue;
    status = ncx_pad_putn_Iuchar(&xp, nelems,
      value, type);
  }

  if(attrpp != NULL)
  {
    assert(old != NULL);
    *attrpp = attrp;
    free_NC_attr(old);
  }
  else
  {
    const int lstatus = incr_NC_attrarray(ncap, attrp);
    /*
     * N.B.: potentially overrides NC_ERANGE
     * set by ncx_pad_putn_Iuchar
     */
    if(lstatus != NC_NOERR)
    {
      free_NC_attr(attrp);
      return lstatus;
    }
  }

  return status;
}

int
nc_get_att_uchar(int ncid, int varid, const char *name, unsigned char *tp)
{
  int status;
  NC_attr *attrp;

  status = NC_lookupattr(ncid, varid, name, &attrp);
  if(status != NC_NOERR)
    return status;

  if(attrp->nelems == 0)
    return NC_NOERR;

  if(attrp->type == NC_CHAR)
    return NC_ECHAR;

  {
  const void *xp = attrp->xvalue;
  return ncx_pad_getn_Iuchar(&xp, attrp->nelems, tp, attrp->type);
  }
}


int
nc_put_att_short(int ncid, int varid, const char *name,
  nc_type type, size_t nelems, const short *value)
{
  int status;
  NC *ncp;
  NC_attrarray *ncap;
  NC_attr **attrpp;
  NC_attr *old = NULL;
  NC_attr *attrp;

  status = NC_check_id(ncid, &ncp);
  if(status != NC_NOERR)
    return status;

  if(NC_readonly(ncp))
    return NC_EPERM;

  ncap = NC_attrarray0(ncp, varid);
  if(ncap == NULL)
    return NC_ENOTVAR;

  status = nc_cktype(type);
  if(status != NC_NOERR)
    return status;

  if(type == NC_CHAR)
    return NC_ECHAR;

    /* cast needed for braindead systems with signed size_t */
  if((unsigned long) nelems > X_INT_MAX) /* backward compat */
    return NC_EINVAL; /* Invalid nelems */

  if(nelems != 0 && value == NULL)
    return NC_EINVAL; /* Null arg */

  attrpp = NC_findattr(ncap, name);
  if(attrpp != NULL) /* name in use */
  {
    if(!NC_indef(ncp) )
    {
      const size_t xsz = ncx_len_NC_attrV(type, nelems);
      attrp = *attrpp; /* convenience */
  
      if(xsz > attrp->xsz)
        return NC_ENOTINDEFINE;
      /* else, we can reuse existing without redef */
      
      attrp->xsz = xsz;
      attrp->type = type;
      attrp->nelems = nelems;

      if(nelems != 0)
      {
        void *xp = attrp->xvalue;
        status = ncx_pad_putn_Ishort(&xp, nelems,
          value, type);
      }
      
      set_NC_hdirty(ncp);

      if(NC_doHsync(ncp))
      {
        const int lstatus = NC_sync(ncp);
        /*
         * N.B.: potentially overrides NC_ERANGE
         * set by ncx_pad_putn_Ishort
         */
        if(lstatus != ENOERR)
          return lstatus;
      }

      return status;
    }
    /* else, redefine using existing array slot */
    old = *attrpp;
  } 
  else
  {
    if(!NC_indef(ncp))
      return NC_ENOTINDEFINE;

    if(ncap->nelems >= NC_MAX_ATTRS)
      return NC_EMAXATTS;
  }

  status = NC_check_name(name);
  if(status != NC_NOERR)
    return status;

  attrp = new_NC_attr(name, type, nelems);
  if(attrp == NULL)
    return NC_ENOMEM;

  if(nelems != 0)
  {
    void *xp = attrp->xvalue;
    status = ncx_pad_putn_Ishort(&xp, nelems,
      value, type);
  }

  if(attrpp != NULL)
  {
    assert(old != NULL);
    *attrpp = attrp;
    free_NC_attr(old);
  }
  else
  {
    const int lstatus = incr_NC_attrarray(ncap, attrp);
    /*
     * N.B.: potentially overrides NC_ERANGE
     * set by ncx_pad_putn_Ishort
     */
    if(lstatus != NC_NOERR)
    {
      free_NC_attr(attrp);
      return lstatus;
    }
  }

  return status;
}

int
nc_get_att_short(int ncid, int varid, const char *name, short *tp)
{
  int status;
  NC_attr *attrp;

  status = NC_lookupattr(ncid, varid, name, &attrp);
  if(status != NC_NOERR)
    return status;

  if(attrp->nelems == 0)
    return NC_NOERR;

  if(attrp->type == NC_CHAR)
    return NC_ECHAR;

  {
  const void *xp = attrp->xvalue;
  return ncx_pad_getn_Ishort(&xp, attrp->nelems, tp, attrp->type);
  }
}


int
nc_put_att_int(int ncid, int varid, const char *name,
  nc_type type, size_t nelems, const int *value)
{
  int status;
  NC *ncp;
  NC_attrarray *ncap;
  NC_attr **attrpp;
  NC_attr *old = NULL;
  NC_attr *attrp;

  status = NC_check_id(ncid, &ncp);
  if(status != NC_NOERR)
    return status;

  if(NC_readonly(ncp))
    return NC_EPERM;

  ncap = NC_attrarray0(ncp, varid);
  if(ncap == NULL)
    return NC_ENOTVAR;

  status = nc_cktype(type);
  if(status != NC_NOERR)
    return status;

  if(type == NC_CHAR)
    return NC_ECHAR;

    /* cast needed for braindead systems with signed size_t */
  if((unsigned long) nelems > X_INT_MAX) /* backward compat */
    return NC_EINVAL; /* Invalid nelems */

  if(nelems != 0 && value == NULL)
    return NC_EINVAL; /* Null arg */

  attrpp = NC_findattr(ncap, name);
  if(attrpp != NULL) /* name in use */
  {
    if(!NC_indef(ncp) )
    {
      const size_t xsz = ncx_len_NC_attrV(type, nelems);
      attrp = *attrpp; /* convenience */
  
      if(xsz > attrp->xsz)
        return NC_ENOTINDEFINE;
      /* else, we can reuse existing without redef */
      
      attrp->xsz = xsz;
      attrp->type = type;
      attrp->nelems = nelems;

      if(nelems != 0)
      {
        void *xp = attrp->xvalue;
        status = ncx_pad_putn_Iint(&xp, nelems,
          value, type);
      }
      
      set_NC_hdirty(ncp);

      if(NC_doHsync(ncp))
      {
        const int lstatus = NC_sync(ncp);
        /*
         * N.B.: potentially overrides NC_ERANGE
         * set by ncx_pad_putn_Iint
         */
        if(lstatus != ENOERR)
          return lstatus;
      }

      return status;
    }
    /* else, redefine using existing array slot */
    old = *attrpp;
  } 
  else
  {
    if(!NC_indef(ncp))
      return NC_ENOTINDEFINE;

    if(ncap->nelems >= NC_MAX_ATTRS)
      return NC_EMAXATTS;
  }

  status = NC_check_name(name);
  if(status != NC_NOERR)
    return status;

  attrp = new_NC_attr(name, type, nelems);
  if(attrp == NULL)
    return NC_ENOMEM;

  if(nelems != 0)
  {
    void *xp = attrp->xvalue;
    status = ncx_pad_putn_Iint(&xp, nelems,
      value, type);
  }

  if(attrpp != NULL)
  {
    assert(old != NULL);
    *attrpp = attrp;
    free_NC_attr(old);
  }
  else
  {
    const int lstatus = incr_NC_attrarray(ncap, attrp);
    /*
     * N.B.: potentially overrides NC_ERANGE
     * set by ncx_pad_putn_Iint
     */
    if(lstatus != NC_NOERR)
    {
      free_NC_attr(attrp);
      return lstatus;
    }
  }

  return status;
}

int
nc_get_att_int(int ncid, int varid, const char *name, int *tp)
{
  int status;
  NC_attr *attrp;

  status = NC_lookupattr(ncid, varid, name, &attrp);
  if(status != NC_NOERR)
    return status;

  if(attrp->nelems == 0)
    return NC_NOERR;

  if(attrp->type == NC_CHAR)
    return NC_ECHAR;

  {
  const void *xp = attrp->xvalue;
  return ncx_pad_getn_Iint(&xp, attrp->nelems, tp, attrp->type);
  }
}


int
nc_put_att_long(int ncid, int varid, const char *name,
  nc_type type, size_t nelems, const long *value)
{
  int status;
  NC *ncp;
  NC_attrarray *ncap;
  NC_attr **attrpp;
  NC_attr *old = NULL;
  NC_attr *attrp;

  status = NC_check_id(ncid, &ncp);
  if(status != NC_NOERR)
    return status;

  if(NC_readonly(ncp))
    return NC_EPERM;

  ncap = NC_attrarray0(ncp, varid);
  if(ncap == NULL)
    return NC_ENOTVAR;

  status = nc_cktype(type);
  if(status != NC_NOERR)
    return status;

  if(type == NC_CHAR)
    return NC_ECHAR;

    /* cast needed for braindead systems with signed size_t */
  if((unsigned long) nelems > X_INT_MAX) /* backward compat */
    return NC_EINVAL; /* Invalid nelems */

  if(nelems != 0 && value == NULL)
    return NC_EINVAL; /* Null arg */

  attrpp = NC_findattr(ncap, name);
  if(attrpp != NULL) /* name in use */
  {
    if(!NC_indef(ncp) )
    {
      const size_t xsz = ncx_len_NC_attrV(type, nelems);
      attrp = *attrpp; /* convenience */
  
      if(xsz > attrp->xsz)
        return NC_ENOTINDEFINE;
      /* else, we can reuse existing without redef */
      
      attrp->xsz = xsz;
      attrp->type = type;
      attrp->nelems = nelems;

      if(nelems != 0)
      {
        void *xp = attrp->xvalue;
        status = ncx_pad_putn_Ilong(&xp, nelems,
          value, type);
      }
      
      set_NC_hdirty(ncp);

      if(NC_doHsync(ncp))
      {
        const int lstatus = NC_sync(ncp);
        /*
         * N.B.: potentially overrides NC_ERANGE
         * set by ncx_pad_putn_Ilong
         */
        if(lstatus != ENOERR)
          return lstatus;
      }

      return status;
    }
    /* else, redefine using existing array slot */
    old = *attrpp;
  } 
  else
  {
    if(!NC_indef(ncp))
      return NC_ENOTINDEFINE;

    if(ncap->nelems >= NC_MAX_ATTRS)
      return NC_EMAXATTS;
  }

  status = NC_check_name(name);
  if(status != NC_NOERR)
    return status;

  attrp = new_NC_attr(name, type, nelems);
  if(attrp == NULL)
    return NC_ENOMEM;

  if(nelems != 0)
  {
    void *xp = attrp->xvalue;
    status = ncx_pad_putn_Ilong(&xp, nelems,
      value, type);
  }

  if(attrpp != NULL)
  {
    assert(old != NULL);
    *attrpp = attrp;
    free_NC_attr(old);
  }
  else
  {
    const int lstatus = incr_NC_attrarray(ncap, attrp);
    /*
     * N.B.: potentially overrides NC_ERANGE
     * set by ncx_pad_putn_Ilong
     */
    if(lstatus != NC_NOERR)
    {
      free_NC_attr(attrp);
      return lstatus;
    }
  }

  return status;
}

int
nc_get_att_long(int ncid, int varid, const char *name, long *tp)
{
  int status;
  NC_attr *attrp;

  status = NC_lookupattr(ncid, varid, name, &attrp);
  if(status != NC_NOERR)
    return status;

  if(attrp->nelems == 0)
    return NC_NOERR;

  if(attrp->type == NC_CHAR)
    return NC_ECHAR;

  {
  const void *xp = attrp->xvalue;
  return ncx_pad_getn_Ilong(&xp, attrp->nelems, tp, attrp->type);
  }
}


int
nc_put_att_float(int ncid, int varid, const char *name,
  nc_type type, size_t nelems, const float *value)
{
  int status;
  NC *ncp;
  NC_attrarray *ncap;
  NC_attr **attrpp;
  NC_attr *old = NULL;
  NC_attr *attrp;

  status = NC_check_id(ncid, &ncp);
  if(status != NC_NOERR)
    return status;

  if(NC_readonly(ncp))
    return NC_EPERM;

  ncap = NC_attrarray0(ncp, varid);
  if(ncap == NULL)
    return NC_ENOTVAR;

  status = nc_cktype(type);
  if(status != NC_NOERR)
    return status;

  if(type == NC_CHAR)
    return NC_ECHAR;

    /* cast needed for braindead systems with signed size_t */
  if((unsigned long) nelems > X_INT_MAX) /* backward compat */
    return NC_EINVAL; /* Invalid nelems */

  if(nelems != 0 && value == NULL)
    return NC_EINVAL; /* Null arg */

  attrpp = NC_findattr(ncap, name);
  if(attrpp != NULL) /* name in use */
  {
    if(!NC_indef(ncp) )
    {
      const size_t xsz = ncx_len_NC_attrV(type, nelems);
      attrp = *attrpp; /* convenience */
  
      if(xsz > attrp->xsz)
        return NC_ENOTINDEFINE;
      /* else, we can reuse existing without redef */
      
      attrp->xsz = xsz;
      attrp->type = type;
      attrp->nelems = nelems;

      if(nelems != 0)
      {
        void *xp = attrp->xvalue;
        status = ncx_pad_putn_Ifloat(&xp, nelems,
          value, type);
      }
      
      set_NC_hdirty(ncp);

      if(NC_doHsync(ncp))
      {
        const int lstatus = NC_sync(ncp);
        /*
         * N.B.: potentially overrides NC_ERANGE
         * set by ncx_pad_putn_Ifloat
         */
        if(lstatus != ENOERR)
          return lstatus;
      }

      return status;
    }
    /* else, redefine using existing array slot */
    old = *attrpp;
  } 
  else
  {
    if(!NC_indef(ncp))
      return NC_ENOTINDEFINE;

    if(ncap->nelems >= NC_MAX_ATTRS)
      return NC_EMAXATTS;
  }

  status = NC_check_name(name);
  if(status != NC_NOERR)
    return status;

  attrp = new_NC_attr(name, type, nelems);
  if(attrp == NULL)
    return NC_ENOMEM;

  if(nelems != 0)
  {
    void *xp = attrp->xvalue;
    status = ncx_pad_putn_Ifloat(&xp, nelems,
      value, type);
  }

  if(attrpp != NULL)
  {
    assert(old != NULL);
    *attrpp = attrp;
    free_NC_attr(old);
  }
  else
  {
    const int lstatus = incr_NC_attrarray(ncap, attrp);
    /*
     * N.B.: potentially overrides NC_ERANGE
     * set by ncx_pad_putn_Ifloat
     */
    if(lstatus != NC_NOERR)
    {
      free_NC_attr(attrp);
      return lstatus;
    }
  }

  return status;
}

int
nc_get_att_float(int ncid, int varid, const char *name, float *tp)
{
  int status;
  NC_attr *attrp;

  status = NC_lookupattr(ncid, varid, name, &attrp);
  if(status != NC_NOERR)
    return status;

  if(attrp->nelems == 0)
    return NC_NOERR;

  if(attrp->type == NC_CHAR)
    return NC_ECHAR;

  {
  const void *xp = attrp->xvalue;
  return ncx_pad_getn_Ifloat(&xp, attrp->nelems, tp, attrp->type);
  }
}


int
nc_put_att_double(int ncid, int varid, const char *name,
  nc_type type, size_t nelems, const double *value)
{
  int status;
  NC *ncp;
  NC_attrarray *ncap;
  NC_attr **attrpp;
  NC_attr *old = NULL;
  NC_attr *attrp;

  status = NC_check_id(ncid, &ncp);
  if(status != NC_NOERR)
    return status;

  if(NC_readonly(ncp))
    return NC_EPERM;

  ncap = NC_attrarray0(ncp, varid);
  if(ncap == NULL)
    return NC_ENOTVAR;

  status = nc_cktype(type);
  if(status != NC_NOERR)
    return status;

  if(type == NC_CHAR)
    return NC_ECHAR;

    /* cast needed for braindead systems with signed size_t */
  if((unsigned long) nelems > X_INT_MAX) /* backward compat */
    return NC_EINVAL; /* Invalid nelems */

  if(nelems != 0 && value == NULL)
    return NC_EINVAL; /* Null arg */

  attrpp = NC_findattr(ncap, name);
  if(attrpp != NULL) /* name in use */
  {
    if(!NC_indef(ncp) )
    {
      const size_t xsz = ncx_len_NC_attrV(type, nelems);
      attrp = *attrpp; /* convenience */
  
      if(xsz > attrp->xsz)
        return NC_ENOTINDEFINE;
      /* else, we can reuse existing without redef */
      
      attrp->xsz = xsz;
      attrp->type = type;
      attrp->nelems = nelems;

      if(nelems != 0)
      {
        void *xp = attrp->xvalue;
        status = ncx_pad_putn_Idouble(&xp, nelems,
          value, type);
      }
      
      set_NC_hdirty(ncp);

      if(NC_doHsync(ncp))
      {
        const int lstatus = NC_sync(ncp);
        /*
         * N.B.: potentially overrides NC_ERANGE
         * set by ncx_pad_putn_Idouble
         */
        if(lstatus != ENOERR)
          return lstatus;
      }

      return status;
    }
    /* else, redefine using existing array slot */
    old = *attrpp;
  } 
  else
  {
    if(!NC_indef(ncp))
      return NC_ENOTINDEFINE;

    if(ncap->nelems >= NC_MAX_ATTRS)
      return NC_EMAXATTS;
  }

  status = NC_check_name(name);
  if(status != NC_NOERR)
    return status;

  attrp = new_NC_attr(name, type, nelems);
  if(attrp == NULL)
    return NC_ENOMEM;

  if(nelems != 0)
  {
    void *xp = attrp->xvalue;
    status = ncx_pad_putn_Idouble(&xp, nelems,
      value, type);
  }

  if(attrpp != NULL)
  {
    assert(old != NULL);
    *attrpp = attrp;
    free_NC_attr(old);
  }
  else
  {
    const int lstatus = incr_NC_attrarray(ncap, attrp);
    /*
     * N.B.: potentially overrides NC_ERANGE
     * set by ncx_pad_putn_Idouble
     */
    if(lstatus != NC_NOERR)
    {
      free_NC_attr(attrp);
      return lstatus;
    }
  }

  return status;
}

int
nc_get_att_double(int ncid, int varid, const char *name, double *tp)
{
  int status;
  NC_attr *attrp;

  status = NC_lookupattr(ncid, varid, name, &attrp);
  if(status != NC_NOERR)
    return status;

  if(attrp->nelems == 0)
    return NC_NOERR;

  if(attrp->type == NC_CHAR)
    return NC_ECHAR;

  {
  const void *xp = attrp->xvalue;
  return ncx_pad_getn_Idouble(&xp, attrp->nelems, tp, attrp->type);
  }
}

