test_vara.c

#include "config.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "netcdf.h"
#include "nctestserver.h"

#define DTSTEST "/dts/test.06"

/* The DDS in netcdf classic form is as follows: 
netcdf test {
dimensions:
	t = 10 ;
	x = 10 ;
	y = 10 ;
	z = 10 ;
variables:
	double OneD(x) ;
	double TwoD(x, y) ;
	double ThreeD(x, y, z) ;
	double FourD(x, y, z, t) ;
}
*/

/* Use the ThreeD variable */
#define NCVAR "ThreeD"

#define X 10
#define Y 10
#define Z 10

#define RANK 3

#define ERRCODE 2
#define ERR(e) {printf("Error: %s\n", nc_strerror(e)); exit(ERRCODE);}

#undef DEBUG

#define DELTA 0.005

/* Setup an odometer */
typedef struct Odom {
    int rank;
    size_t* index;    
    size_t* stop;
    size_t* start;
    size_t* count;
} Odom;

static float target_data[X][Y][Z];
static float target[X][Y][Z];
static dims[RANK] = {X,Y,Z};

static Odom* odom_create(int rank);
static void odom_reclaim(Odom* odom);
static void odom_set(Odom* odom, size_t* start, size_t* count);
static int odom_more(Odom* odom);
static int odom_incr(Odom* odom);
static size_t odom_count(Odom* odom);

static int check(size_t* start, size_t* count);

/* Define whole variable start/count */
static size_t start0[RANK] = {0,0,0};
static size_t count0[RANK] = {X,Y,Z};

static int floateq(float f1, float f2)
{
    float diff = f1 - f2;
    if(diff >= 0 && diff < DELTA) return 1;
    if(diff <= 0 && diff > -DELTA) return 1;
    return 0;
}

int
main()
{
    int ncid, varid;
    int retval,i;
    size_t start[RANK];
    size_t count[RANK];
    char URL[4096];
    const char* svc = NULL;
    
    /* Find Test Server */
    svc = nc_findtestserver("dts",0);
    if(svc == NULL) {
	fprintf(stderr,"Cannot locate test server\n");
	exit(1);
    }
    printf("Using test server: %s\n",svc);
    strncpy(URL,svc,sizeof(URL));
    strlcat(URL,DTSTEST,sizeof(URL));

    memset((void*)target,0,sizeof(target));

    if((retval = nc_open(URL, NC_NOWRITE, &ncid)))
       ERR(retval);

    if((retval = nc_inq_varid(ncid, NCVAR, &varid)))
       ERR(retval);

    printf("test 1: Read the whole variable\n");
    memcpy(start,start0,sizeof(start0));
    memcpy(count,count0,sizeof(count0));

    if((retval = nc_get_vara_float(ncid,varid,start,count,(float*)target)))
       ERR(retval);
    if(!check(start,count)) goto fail;

    printf("test 2: Read the top half\n");
    memcpy(start,start0,sizeof(start0));
    memcpy(count,count0,sizeof(count0));
    start[0] += count0[0]/2;
    count[0] = count0[0] - start[0];

    if((retval = nc_get_vara_float(ncid,varid,start,count,(float*)target)))
       ERR(retval);
    if(!check(start,count)) goto fail;

    printf("test 3: Read the slice with X=1\n");
    memcpy(start,start0,sizeof(start0));
    memcpy(count,count0,sizeof(count0));
    start[0] = 1;
    count[0] = 1;

    if((retval = nc_get_vara_float(ncid,varid,start,count,(float*)target)))
       ERR(retval);
    if(!check(start,count)) goto fail;

    if((retval = nc_close(ncid)))
       ERR(retval);

    printf("*** PASS\n");
    return 0;
fail:
    printf("*** FAIL\n");
    return 1;
}

static int
check(size_t* start, size_t* count)
{
    int ok = 1;
    int index = 0;
    Odom* odom = odom_create(RANK);
    odom_set(odom,start,count);
    float* result = (float*)target;
    float* expected = (float*)target_data;
    for(index=0;odom_more(odom);odom_incr(odom),index++) {
	size_t offset = odom_count(odom);
	if(!floateq(result[index],expected[offset])) {
	    fprintf(stderr,"fail: result[%lu] = %f ; expected[%lu] = %f\n",
		index,result[index],offset,expected[offset]);
	    ok=0;
	}
    }
    odom_reclaim(odom);
    return ok;
}

static Odom* odom_create(int rank)
{
    Odom* odom = (Odom*)malloc(sizeof(Odom));
    /* Init the odometer */
    odom->rank = rank;
    odom->index = (size_t*)calloc(sizeof(size_t)*rank,1);
    odom->stop = (size_t*)calloc(sizeof(size_t)*rank,1);
    odom->start = (size_t*)calloc(sizeof(size_t)*rank,1);
    odom->count = (size_t*)calloc(sizeof(size_t)*rank,1);
    return odom;
}

static void odom_reclaim(Odom* odom)
{
    free(odom->index);
    free(odom->stop);
    free(odom->start);
    free(odom->count);
    free(odom);
}


static void odom_set(Odom* odom, size_t* start, size_t* count) 
{
    int i;
    /* Init the odometer */
    for(i=0;i<odom->rank;i++) {
        odom->start[i] = start[i];
        odom->count[i] = count[i];
    }
    for(i=0;i<odom->rank;i++) {
        odom->index[i] = odom->start[i];
        odom->stop[i] =  odom->start[i] + odom->count[i];
    }
}

static int odom_more(Odom* odom)
{
    return (odom->index[0] < odom->stop[0]?1:0);
}

static int odom_incr(Odom* odom)
{
    int i; /* do not make unsigned */
    if(odom->rank == 0) return 0; 
    for(i=odom->rank-1;i>=0;i--) {
        odom->index[i]++;
        if(odom->index[i] < odom->stop[i]) break;
	if(i == 0) return 0; /* leave the 0th entry if it overflows*/
	odom->index[i] = odom->start[i]; /* reset this position*/
    }
    return 1;
}

/* Convert current dapodometer settings to a single integer count*/
static size_t odom_count(Odom* odom)
{
    int i;
    size_t offset = 0;
    for(i=0;i<odom->rank;i++) {
	offset *= odom->count[i];
	offset += odom->index[i];
    } 
    return offset;
}

static float target_data[X][Y][Z] = {
  1, 0.999950000416665, 0.999800006666578, 0.999550033748988, 
    0.999200106660978, 0.998750260394966, 0.998200539935204, 
    0.99755100025328, 0.996801706302619, 0.995952733011994,
  0.995004165278026, 0.993956097956697, 0.992808635853866, 0.991561893714788, 
    0.990215996212637, 0.988771077936042, 0.987227283375627, 
    0.985584766909561, 0.983843692788121, 0.98200423511727,
  0.980066577841242, 0.978030914724148, 0.975897449330606, 0.973666395005375, 
    0.97133797485203, 0.968912421710645, 0.966389978134513, 
    0.963770896365891, 0.961055438310771, 0.958243875512697,
  0.955336489125606, 0.952333569885713, 0.949235418082441, 0.946042343528387, 
    0.942754665528346, 0.939372712847379, 0.935896823677935, 
    0.932327345606034, 0.92866463557651, 0.924909059857313,
  0.921060994002885, 0.917120822816605, 0.913088940312308, 0.908965749674885, 
    0.904751663219963, 0.900447102352677, 0.896052497525525, 
    0.891568288195329, 0.886994922779284, 0.882332858610121,
  0.877582561890373, 0.872744507645751, 0.86781917967765, 0.862807070514761, 
    0.857708681363824, 0.852524522059506, 0.847255111013416, 
    0.841900975162269, 0.836462649915187, 0.830940679100164,
  0.825335614909678, 0.819648017845479, 0.813878456662534, 0.808027508312152, 
    0.802095757884293, 0.796083798549056, 0.789992231497365, 
    0.783821665880849, 0.777572718750928, 0.771246014997107,
  0.764842187284488, 0.758361875990508, 0.751805729140895, 0.74517440234487, 
    0.738468558729588, 0.731688868873821, 0.724836010740905, 
    0.717910669610943, 0.710913538012277, 0.703845315652236,
  0.696706709347165, 0.689498432951747, 0.682221207287614, 0.674875760071267, 
    0.667462825841308, 0.659983145884982, 0.652437468164052, 
    0.644826547240001, 0.63715114419858, 0.629412026573697,
  0.621609968270664, 0.613745749488812, 0.605820156643463, 0.597833982287298, 
    0.589788025031098, 0.581683089463883, 0.573519986072457, 
    0.565299531160354, 0.557022546766217, 0.548689860581588,
  0.54030230586814, 0.531860721374355, 0.52336595125165, 0.514818844969955, 
    0.506220257232778, 0.497571047891727, 0.488872081860527, 
    0.480124229028534, 0.47132836417374, 0.462485366875301,
  0.453596121425577, 0.444661516741707, 0.435682446276712, 0.426659807930157, 
    0.417594503958358, 0.408487440884157, 0.399339529406273, 
    0.39015168430823, 0.380924824366882, 0.371659872260533,
  0.362357754476674, 0.35301940121933, 0.343645746316047, 0.334237727124503, 
    0.324796284438776, 0.315322362395269, 0.305816908378289, 
    0.296280872925319, 0.286715209631956, 0.277120875056558,
  0.267498828624587, 0.25785003253267, 0.248175451652373, 0.238476053433723, 
    0.228752807808459, 0.219006687093041, 0.209238665891419, 
    0.199449720997573, 0.189640831297834, 0.179812977673,
  0.169967142900241, 0.160104311554831, 0.150225469911686, 0.140331605846737, 
    0.130423708738146, 0.120502769367367, 0.11056977982007, 
    0.100625733386932, 0.0906716244643097, 0.0807084484548006,
  0.0707372016677029, 0.0607588812193859, 0.0507744849335792, 
    0.040785011241591, 0.0307914590824661, 0.0207948278030924, 
    0.0107961170582674, 0.000796326710733263, -0.00920354326880834, 
    -0.0192024929016926,
  -0.0291995223012888, -0.0391936317729877, -0.0491838219141706, 
    -0.0591690937141481, -0.0691484486540619, -0.0791208888067339, 
    -0.089085416936459, -0.099041036598728, -0.108986752239871, 
    -0.118921569296612,
  -0.128844494295525, -0.138754534952378, -0.148650700271364, 
    -0.158532000644198, -0.168397447949077, -0.178246055649492, 
    -0.18807683889288, -0.197888814609109, -0.207681001608784, 
    -0.217452420681365,
  -0.227202094693087, -0.236929048684675, -0.246632309968834, 
    -0.256310908227523, -0.26596387560898, -0.275590246824513, 
    -0.285189059245021, -0.294759352997261, -0.304300171059833, 
    -0.313810559358882,
  -0.323289566863503, -0.332736245680845, -0.342149651150898, 
    -0.35152884194096, -0.360872880139767, -0.370180831351287, 
    -0.379451764788155, -0.388684753364752, -0.397878873789916, 
    -0.407033206659266,
  -0.416146836547142, -0.425218852098152, -0.4342483461183, 
    -0.443234415665709, -0.452176162140912, -0.461072691376713, 
    -0.469923113727602, -0.47872654415872, -0.487482102334359, 
    -0.496188912705999,
  -0.504846104599858, -0.513452812303959, -0.522008175154707, 
    -0.530511337622945, -0.538961449399512, -0.547357665480271, 
    -0.555699146250613, -0.56398505756941, -0.572214570852437, 
    -0.580386863155222,
  -0.588501117255346, -0.59655652173416, -0.60455227105793, 
    -0.612487565658385, -0.62036161201268, -0.628173622722739, 
    -0.635922816594002, -0.643608418713541, -0.651229660527546, 
    -0.658785779918188,
  -0.666276021279824, -0.673699635594561, -0.681055880507152, 
    -0.688344020399238, -0.695563326462902, -0.702713076773554, 
    -0.70979255636212, -0.716801057286543, -0.723737878702569, 
    -0.730602326933837,
  -0.737393715541245, -0.744111365391593, -0.750754604725491, 
    -0.757322769224544, -0.763815202077774, -0.770231254047307, 
    -0.776570283533293, -0.782831656638065, -0.789014747229531, 
    -0.795118937003784,
  -0.801143615546934, -0.807088180396146, -0.81295203709989, 
    -0.818734599277382, -0.824435288677222, -0.830053535235222, 
    -0.835588777131408, -0.841040460846201, -0.846408041215776, 
    -0.851690981486566,
  -0.856888753368947, -0.862000837090063, -0.867026721445802, 
    -0.871965903851917, -0.876817890394281, -0.881582195878286, 
    -0.886258343877352, -0.890845866780576, -0.895344305839492, 
    -0.899753211213941,
  -0.904072142017061, -0.90830066635937, -0.912438361391958, 
    -0.916484813348769, -0.920439617587981, -0.924302378632464, 
    -0.928072710209333, -0.931750235288572, -0.935334586120739, 
    -0.938825404273736,
  -0.942222340668658, -0.945525055614696, -0.948733218843107, 
    -0.951846509540242, -0.954864616379626, -0.95778723755309, 
    -0.960614080800952, -0.963344863441243, -0.965979312397975, 
    -0.968517164228447,
  -0.970958165149591, -0.973302071063349, -0.975548647581083, 
    -0.977697670047013, -0.979748923560684, -0.981702202998454, 
    -0.983557313034006, -0.985314068157884, -0.986972292696038, 
    -0.988531820827396,
  -0.989992496600445, -0.991354173948826, -0.992616716705937, 
    -0.993779998618556, -0.994843903359459, -0.995808324539061, 
    -0.996673165716047, -0.997438340407019, -0.998103772095146, 
    -0.998669394237814,
  -0.999135150273279, -0.999500993626328, -0.999766887712928, 
    -0.999932805943894, -0.99999873172754, -0.999964658471342, 
    -0.999830589582598, -0.999596538468086, -0.999262528532721, 
    -0.998828593177219,
  -0.998294775794753, -0.997661129766618, -0.996927718456887, 
    -0.996094615206081, -0.99516190332383, -0.994129676080546, 
    -0.992998036698093, -0.991767098339465, -0.990436984097473, 
    -0.989007826982433,
  -0.987479769908865, -0.985852965681203, -0.984127576978514, 
    -0.982303776338232, -0.980381746138899, -0.978361678581934, 
    -0.97624377567241, -0.974028249198852, -0.971715320712062, 
    -0.969305221502961,
  -0.966798192579461, -0.964194484642366, -0.961494358060299, 
    -0.958698082843669, -0.955805938617666, -0.952818214594305, 
    -0.949735209543496, -0.946557231763177, -0.943284599048476, 
    -0.939917638659938,
  -0.936456687290796, -0.932902091033304, -0.929254205344123, 
    -0.925513395008784, -0.921680034105203, -0.917754505966276, 
    -0.913737203141545, -0.909628527357945, -0.90542888947963, 
    -0.901138709466889,
  -0.896758416334147, -0.892288448107068, -0.88772925177875, 
    -0.883081283265026, -0.878345007358874, -0.873520897683938, 
    -0.868609436647165, -0.863611115390566, -0.858526433742102, 
    -0.8533559001657,
  -0.848100031710408, -0.842759353958694, -0.83733440097388, 
    -0.831825715246746, -0.826233847641272, -0.820559357339561, 
    -0.814802811785913, -0.808964786630086, -0.803045865669731, 
    -0.797046640792012,
  -0.790967711914417, -0.784809686924768, -0.778573181620433, 
    -0.772258819646744, -0.765867232434637, -0.759399059137508, 
    -0.752854946567295, -0.746235549129803, -0.739541528759258, 
    -0.73277355485212,
  -0.72593230420014, -0.719018460922681, -0.71203271639831, 
    -0.704975769195658, -0.697848325003564, -0.690651096560507, 
    -0.683384803583336, -0.676050172695292, -0.668647937353351, 
    -0.66117883777488,
  -0.653643620863612, -0.646043040134959, -0.63837785564066, 
    -0.630648833892775, -0.622856747787041, -0.615002376525574, 
    -0.607086505538955, -0.599109926407685, -0.591073436783031, 
    -0.582977840307259,
  -0.574823946533269, -0.566612570843644, -0.55834453436911, 
    -0.550020663906425, -0.541641791835699, -0.533208756037154, 
    -0.524722399807346, -0.516183571774825, -0.507593125815277, 
    -0.49895192096614,
  -0.490260821340699, -0.481520696041674, -0.47273241907431, 
    -0.46389686925898, -0.455014930143305, -0.446087489913793, 
    -0.437115441307028, -0.428099681520394, -0.419041112122356, 
    -0.409940638962306,
  -0.400799172079975, -0.391617625614436, -0.38239691771268, 
    -0.373137970437818, -0.363841709676858, -0.354509065048132, 
    -0.345140969808323, -0.335738360759151, -0.326302178153684, 
    -0.316833365602319,
  -0.307332869978419, -0.297801641323633, -0.288240632752882, 
    -0.278650800359055, -0.269033103117399, -0.259388502789626, 
    -0.249717963827731, -0.24002245327755, -0.230302940682059, 
    -0.220560397984419,
  -0.21079579943078, -0.20101012147286, -0.191204342670302, 
    -0.181379443592811, -0.171536406722112, -0.161676216353687, 
    -0.151799858498356, -0.141908320783673, -0.13200259235517, 
    -0.122083663777433,
  -0.112152526935055, -0.102210174933442, -0.0922576019995117, 
    -0.0822958033822624, -0.0723257752532545, -0.0623485146069917, 
    -0.0523650191612259, -0.0423762872571815, -0.0323833177597247, 
    -0.0223871099574771,
  -0.0123886634628906, -0.00238897811228154, 0.0076109461341479, 
    0.0176101092923073, 0.0276075114542115, 0.0376021528879766, 
    0.0475930341377878, 0.057579156123846, 0.0675595202422752, 
    0.0775331284649787,
  0.0874989834394464, 0.0974560885884857, 0.10740344820988, 
    0.117340067575955, 0.127264953033056, 0.137177112100907, 
    0.147075553571863, 0.156959287610023, 0.166827325850222, 0.176678681496857,
  0.186512369422576, 0.196327406266778, 0.206122810533958, 0.215897602691854, 
    0.225650805269396, 0.235381442954451, 0.245088542691362, 
    0.254771133778243, 0.264428247964056, 0.274058919545427,
  0.283662185463226, 0.293237085398863, 0.302782661870324, 0.312297960327916, 
    0.321782029249722, 0.331233920236754, 0.340652688107789, 
    0.350037390993891, 0.35938709043259, 0.368700851461733,
  0.37797774271298, 0.387216836504937, 0.396417208935922, 0.405577939976361, 
    0.414698113560782, 0.423776817679428, 0.432813144469452, 
    0.441806190305705, 0.450755055891099, 0.459658846346532,
  0.468516671300377, 0.477327644977522, 0.48609088628794, 0.494805518914805, 
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