ncdf4a13/libsrc/attr.c

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/* 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: attr.m4,v 2.25 2005/06/23 15:54:26 russ Exp $ */

#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);
        }
        /* 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);
        }
        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);
        }
        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);
        }
        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);
        }
        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);
        }
        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);
        }
        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);
        }
        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);
        }
        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);
        }
        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);
        }
        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);
        }
        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);
        }
        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);
        }
        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);
        }
        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);
        }
}

---