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/*********************************************************************
* Copyright 2018, UCAR/Unidata
* See netcdf/COPYRIGHT file for copying and redistribution conditions.
*********************************************************************/
/* $Id: odom.c,v 1.5 2010/05/27 21:34:18 dmh Exp $ */
/* $Header: /upc/share/CVS/netcdf-3/ncgen/odom.c,v 1.5 2010/05/27 21:34:18 dmh Exp $ */
#include "includes.h"
#include "odom.h"
/**************************************************/
/* Define methods for a dimension odometer*/
Odometer*
newodometer(Dimset* dimset, size_t* startp, size_t* countp)
{
int i;
Odometer* odom;
ASSERT(dimset != NULL);
ASSERT(dimset->ndims > 0);
odom = (Odometer*)ecalloc(sizeof(Odometer));
if(odom == NULL) return NULL;
odom->origin = odom;
odom->offset = 0;
odom->rank = dimset->ndims;
ASSERT(odom->rank <= NC_MAX_VAR_DIMS);
for(i=0;i<odom->rank;i++) {
odom->declsize[i] = dimset->dimsyms[i]->dim.declsize;
odom->start[i] = (startp == NULL ? 0
: startp[i]);
odom->count[i] = (countp == NULL ? odom->declsize[i]
: countp[i]);
odom->index[i] = odom->start[i];
/* verify */
ASSERT(odom->start[i] + odom->count[i] <= odom->declsize[i]);
}
return odom;
}
Odometer*
newsubodometer(Odometer* origin, Dimset* dimset, int start, int stop)
{
Odometer* odom;
ASSERT(dimset != NULL);
ASSERT(dimset->ndims > 0 && dimset->ndims >= stop);
ASSERT(stop > start);
odom = (Odometer*)ecalloc(sizeof(Odometer));
if(odom == NULL) return NULL;
odom->origin = origin;
odom->offset = start;
odom->rank = (stop - start);
ASSERT(odom->rank <= NC_MAX_VAR_DIMS);
return odom;
}
void
odometerfree(Odometer* odom)
{
if(odom) efree(odom);
}
char*
odometerprint(Odometer* odom)
{
int i;
static char line[1024];
char tmp[64];
line[0] = '\0';
if(odom->origin->rank == 0) {
strcat(line,"[]");
} else for(i=0;i<odom->rank;i++) {
int ioffset = i + odom->offset;
sprintf(tmp,"[%lu/%lu..%lu:%lu]",
(unsigned long)odom->origin->index[ioffset],
(unsigned long)odom->origin->start[ioffset],
(unsigned long)odom->origin->declsize[ioffset],
(unsigned long)odom->origin->count[ioffset]
);
strcat(line,tmp);
}
return line;
}
int
odometermore(Odometer* odom)
{
size_t index,start,count;
int offset = odom->offset;
ASSERT(odom->rank > 0);
index = odom->origin->index[offset];
start = odom->origin->start[offset];
count = odom->origin->count[offset];
if(index < start + count) return 1;
/* reset the zero'th wheel before returning */
odom->origin->index[offset] = odom->origin->start[offset];
return 0;
}
int
odometerincr(Odometer* odom)
{
int i;
int last = odom->rank-1;
ASSERT(odom->rank > 0);
for(i=last;i>=0;i--) {
int ioffset = i+odom->offset;
odom->origin->index[ioffset]++;
if(odom->origin->index[ioffset]
< (odom->origin->start[ioffset]
+odom->origin->count[ioffset]))
break;
if(i==0) break; /* leave 0'th for next more() check */
odom->origin->index[ioffset] = odom->origin->start[ioffset];
}
return i; /* return rightmost incremented */
}
/*
Suppose we have the declaration int F[2][5][3];
There are obviously a total of 2 X 5 X 3 = 30 integers in F.
Thus, these three dimensions will be reduced to a single
dimension of size 30 (0..29).
A particular point in the three dimensions, say [x][y][z], is reduced to
a number in the range 0..29 by computing ((x*5)+y)*3+z
So, given an odometer in some state, it computes the offset
for that odometer's state.
*/
size_t
odometeroffset(Odometer* odom)
{
int i;
size_t count = 0;
for(i=0;i<odom->rank;i++) {
int ioffset = i+odom->offset;
if(i > 0) count *= odom->origin->declsize[ioffset];
count += odom->origin->index[ioffset];
}
return count;
}
/*
Get the start vector
from the odometer
*/
size_t*
odometerstartvector(Odometer* odom)
{
return odom->start;
}
/*
Get the count vector
from the odometer
*/
size_t*
odometercountvector(Odometer* odom)
{
return odom->count;
}
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