/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * *
 * Copyright by The HDF Group.                                               *
 * Copyright by the Board of Trustees of the University of Illinois.         *
 * All rights reserved.                                                      *
 *                                                                           *
 * This file is part of HDF.  The full HDF copyright notice, including       *
 * terms governing use, modification, and redistribution, is contained in    *
 * the COPYING file, which can be found at the root of the source code       *
 * distribution tree, or in https://support.hdfgroup.org/ftp/HDF/releases/.  *
 * If you do not have access to either file, you may request a copy from     *
 * help@hdfgroup.org.                                                        *
 * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */

/****************************************************************************
 * tunlim.c - tests reading/writing variables with unlimited dimension using
 *		SD API.  The tests here are added to test the behavior of the
 *		library when dealing with unlimited dimensions with nc API.  The
 *		tests show that the data is correctly written when:
 *		+ data added immediately after last record
 *		+ data added skipping one or more records
 *		+ data overridden existing data
 *		+ data read pass the end of that variable but not the max in
 *		  all the variables in the file
 *
 * Structure of the file:
 *    test_unlim - test driver
 *        test_1dim_singlevar - tests on a single variable with only 1 dimension
 *        test_1dim_multivars - tests on multiple variables with only 1 dimension
 *        test_multidim_singlevar - tests on single variable with multiple
 *		dimensions
 *	  test_1dim_multivars_addon - tests multiple 1-dim variables that were
 *		added on to existing file
 *
 ****************************************************************************/

#include <string.h>

#include "mfhdf.h"
#include "hdftest.h"

#define DIM0 20

/********************************************************************
   Name: verify_info_data() - utility function that verifies the unlimited
                dimension's size and the variable's data.

   Description:
        This utility function carries out the following tasks:
        - SDgetinfo to get the size of the unlimited dimension
        - SDreaddata to read the variable up to the unlimited dimension's size,
          that is the max number of records in the file
        - memcmp to verify that the read buffer is as expected

        It is used by only test_1dim_singlevar, test_1dim_multivars, and
        test_1dim_multivars_addon because it only handles 1-dim dataset and
        number type int16.  It can be revised for multi-dim datasets or
        any number types, if desired.

   Return value:
        The number of errors occurred in this routine.

*********************************************************************/

int
verify_info_data(int32 sds_id, int32 expected_dimsize, int16 *result)
{
    int32 dimsizes[1];   /* dimension size buffer */
    int32 start[1],      /* where to start reading */
        edges[1];        /* length of data to be read/written */
    char  info[40];      /* holds brief info where failure occurs */
    int16 outdata[DIM0]; /* data read back */
    char  ds_name[20];   /* dataset name */
    intn  status   = 0;  /* returned by called functions */
    intn  num_errs = 0;  /* number of errors */

    /* Get information of the first dataset, and verify its dimension */
    status = SDgetinfo(sds_id, ds_name, NULL, dimsizes, NULL, NULL);
    sprintf(info, "%s on <%s>", "SDgetinfo", ds_name);
    CHECK(status, FAIL, info);
    VERIFY(dimsizes[0], expected_dimsize, info);

    /* Read back data and verify */
    start[0] = 0;
    edges[0] = dimsizes[0];
    status   = SDreaddata(sds_id, start, NULL, edges, (void *)outdata);
    sprintf(info, "%s on <%s>", "SDreaddata", ds_name);
    CHECK(status, FAIL, info);

    /* Verify read data by comparing the output buffer against expected data */
    status = memcmp(outdata, result, edges[0] * SIZE_INT16);
    if (status != 0)
        fprintf(stderr, "For SDS %s: Read data doesn't match input\n", ds_name);

    /* Return the number of errors occurred here */
    return (num_errs);
}

/********************************************************************
   Name: test_1dim_singlevar() - tests on a single variable with only 1 dimension

   Description:
        The main contents include:
        - write 4 elements starting at index 0
        - try reading 2 elements pass the end, should fail
        - append 2 elements starting at index 6, that is indices 4 and 5 will
          be written with fill value
        - append 3 elements immediately at the end of the data
        - overwrite indices 0 and 1

   Return value:
        The number of errors occurred in this routine.

*********************************************************************/

#define FILENAME1 "onedimonevar.nc"
static int
test_1dim_singlevar()
{
    int32 fid;           /* file id */
    int32 dset1;         /* dataset ids */
    int32 dimsizes[1];   /* dimension size buffer */
    int32 start[1],      /* where to start writing */
        edges[1];        /* length of data to be read/written */
    int16 fillval  = 99; /* fill value for the variable */
    intn  status   = 0;  /* returned by called functions */
    intn  num_errs = 0;  /* number of errors so far */

    /* result data to compare against read data; the first two elements will
        be changed to "1,2" later for the last test. */
    int16 result[] = {300, 301, 302, 303, 99, 99, 30, 31, 801, 802, 803};

    /* enter define mode */
    fid = SDstart(FILENAME1, DFACC_CREATE);
    CHECK(fid, FAIL, "SDstart");

    /* Define dimension of the data set to be created. */
    dimsizes[0] = SD_UNLIMITED;

    /* Create an array data sets. */
    dset1 = SDcreate(fid, "Variable 1", DFNT_INT16, 1, dimsizes);
    CHECK(dset1, FAIL, "SDcreate");

    /* Datasets will be filled with fill values when data is missing */
    status = SDsetfillvalue(dset1, (void *)&fillval);
    CHECK(status, FAIL, "SDsetfillvalue");

    { /* Add data */
        int16 data[] = {300, 301, 302, 303};

        /* Write 4 elements starting at index 0 */
        start[0] = 0;
        edges[0] = 4;
        status   = SDwritedata(dset1, start, NULL, edges, (void *)data);
        CHECK(status, FAIL, "SDwritedata");
    }

    /* Get information of the dataset, and verify its data and dim size */
    num_errs = num_errs + verify_info_data(dset1, 4, result);

    { /* Append data to dataset pass the end */
        int16 data[] = {30, 31};

        /* Write 2 values starting at index 6 */
        start[0] = 6;
        edges[0] = 2;
        status   = SDwritedata(dset1, start, NULL, edges, (void *)data);
        CHECK(status, FAIL, "SDwritedata");
    }

    /* Get information of the dataset, and verify its dimension */
    num_errs = num_errs + verify_info_data(dset1, 8, result);

    { /* Append data to dataset at the end */
        int16 data[] = {801, 802, 803};

        /* Write 3 values starting at index 8, at the end */
        start[0] = 8;
        edges[0] = 3;
        status   = SDwritedata(dset1, start, NULL, edges, (void *)data);
        CHECK(status, FAIL, "SDwritedata");
    }

    /* Get information of the dataset, and verify its dimension */
    num_errs = num_errs + verify_info_data(dset1, 11, result);

    { /* Override the first 2 elements */
        int16 data[] = {1, 2};

        /* Write 2 values starting at 0 */
        start[0] = 0;
        edges[0] = 2;
        status   = SDwritedata(dset1, start, NULL, edges, (void *)data);
        CHECK(status, FAIL, "SDwritedata");
    }

    /* Modify the first 2 elements of the result buffer appropriately */
    result[0] = 1;
    result[1] = 2;

    /* Get information of the dataset, and verify its dimension */
    num_errs = num_errs + verify_info_data(dset1, 11, result);

    /* Close the dataset */
    status = SDendaccess(dset1);
    CHECK(status, FAIL, "SDendaccess");

    /* Close the file */
    status = SDend(fid);
    CHECK(status, FAIL, "SDend");

    return 0;
}

/********************************************************************
   Name: test_1dim_multivars() - tests reading/writing on multiple variables,
        each has 1 dimension

   Description:
        The main contents include:
        - write 4 elements starting at index 0 to variable #1
        - write 2 elements starting at index 0 to variable #2
        - close file and reopen for read/write
        - append 2 elements to variable #1, immediately after last written record
        - write 3 elements to variable #2, starting at index 4
        - append 3 elements to variable #1, skipping 5 records after the last
          written record

   Return value:
        The number of errors occurred in this routine.

*********************************************************************/

#define FILENAME2 "onedimmultivars.nc"
static int
test_1dim_multivars()
{
    int32 fid;           /* file id */
    int32 dset1, dset2;  /* dataset ids */
    int32 dimsizes[1];   /* dimension size buffer */
    int32 start[1],      /* where to start writing */
        edges[1];        /* length of data to be read/written */
    int16 outdata[DIM0]; /* data read back */
    int16 fillval1 = -1; /* fill value for the variable */
    int16 fillval2 = -2; /* fill value for the variable */
    intn  status   = 0;  /* returned by called functions */
    intn  num_errs = 0;  /* number of errors so far */

    /* result data to compare against read data */
    int16 result1[] = {300, 301, 302, 303, -1, -1, 400, 401, 500, 501, 502};
    int16 result2[] = {102, 104, -2, -2, -2, -2, -2, -2, 200, 201, 202, 800, 801, 802, 803};

    /* enter define mode */
    fid = SDstart(FILENAME2, DFACC_CREATE);
    CHECK(fid, FAIL, "SDstart");

    /* Define dimension of the data set to be created. */
    dimsizes[0] = SD_UNLIMITED;

    /* Create two array data sets. */
    dset1 = SDcreate(fid, "Variable 1", DFNT_INT16, 1, dimsizes);
    CHECK(dset1, FAIL, "SDcreate");
    dset2 = SDcreate(fid, "Variable 2", DFNT_INT16, 1, dimsizes);
    CHECK(dset2, FAIL, "SDcreate");

    /* Datasets will be filled with fill values when data is missing */
    status = SDsetfillvalue(dset1, (void *)&fillval1);
    CHECK(status, FAIL, "SDsetfillvalue");
    status = SDsetfillvalue(dset2, (void *)&fillval2);
    CHECK(status, FAIL, "SDsetfillvalue");

    { /* Add data */
        int16 data[]  = {300, 301, 302, 303};
        int16 data2[] = {102, 104};

        /* Write 4 elements to first dataset starting at index 0 */
        start[0] = 0;
        edges[0] = 4;
        status   = SDwritedata(dset1, start, NULL, edges, (void *)data);
        CHECK(status, FAIL, "SDwritedata");

        /* Write 2 elements to second dataset starting at index 0 */
        edges[0] = 2;
        status   = SDwritedata(dset2, start, NULL, edges, (void *)data2);
        CHECK(status, FAIL, "SDwritedata");
    }

    /* Get information of the first dataset, and verify its data and dimsize */
    num_errs = num_errs + verify_info_data(dset1, 4, result1);

    /* Get information of the second dataset, and verify its data and dimsize */
    num_errs = num_errs + verify_info_data(dset2, 2, result2);

    /* Try reading pass the end, should fail */
    edges[0] = 6;
    status   = SDreaddata(dset1, start, NULL, edges, (void *)outdata);
    VERIFY(status, FAIL, "SDreaddata");

    { /* Append data to first dataset pass the end */
        int16 data[] = {400, 401};

        /* Write 2 values starting at index 6 */
        start[0] = 6;
        edges[0] = 2;
        status   = SDwritedata(dset1, start, NULL, edges, (void *)data);
        CHECK(status, FAIL, "SDwritedata");
    }

    /* Get information of the first dataset, and verify its data and dimsize */
    num_errs = num_errs + verify_info_data(dset1, 8, result1);

    /* Get information of the second dataset, and verify its data and dimsize */
    num_errs = num_errs + verify_info_data(dset2, 2, result2);

    { /* Append data to first dataset at the end */
        int16 data[] = {500, 501, 502};

        /* Write 3 values starting at index 8 */
        start[0] = 8;
        edges[0] = 3;
        status   = SDwritedata(dset1, start, NULL, edges, (void *)data);
        CHECK(status, FAIL, "SDwritedata");
    }

    /* Get information of the first dataset, and verify its data and dimsize */
    num_errs = num_errs + verify_info_data(dset1, 11, result1);

    { /* Append data to second dataset pass its end */
        int16 data[] = {200, 201, 202};

        /* Write 2 values starting at index 8 */
        start[0] = 8;
        edges[0] = 3;
        status   = SDwritedata(dset2, start, NULL, edges, (void *)data);
        CHECK(status, FAIL, "SDwritedata");
    }

    /* Get information of the second dataset, and verify its data and dimsize */
    num_errs = num_errs + verify_info_data(dset2, 11, result2);

    { /* Append data to second dataset at its end */
        int16 data[] = {800, 801, 802, 803};

        /* Write 2 values starting at index 11 */
        start[0] = 11;
        edges[0] = 4;
        status   = SDwritedata(dset2, start, NULL, edges, (void *)data);
        CHECK(status, FAIL, "SDwritedata");
    }

    /* Get information of the first dataset, and verify its data and dimsize */
    num_errs = num_errs + verify_info_data(dset1, 11, result1);

    /* Get information of the second dataset, and verify its data and dimsize */
    num_errs = num_errs + verify_info_data(dset2, 15, result2);

    /* Close the dataset */
    status = SDendaccess(dset1);
    CHECK(status, FAIL, "SDendaccess");

    /* Close the file */
    status = SDend(fid);
    CHECK(status, FAIL, "SDend");

    return 0;
}

/********************************************************************
   Name: test_multidim_singlevar() - tests on a single variable with more
        than one dimension

   Description:
        The main contents include:
        - create a 3-D variable with 1 unlimited dimension and the others 3x2
        - write 4x1x1 elements starting at index {0,0,0}
        - append 2x1x1 elements along the unlimited dimension starting at
          index 6, that is slabs at indices 4 and 5 will be written with fill
          value
        - append 1x3x2 elements immediately at the end of the data

   Return value:
        The number of errors occurred in this routine.

*********************************************************************/

#define DIM00     10
#define DIM1      3
#define DIM2      2
#define FILENAME3 "multidimvar.nc"
static int
test_multidim_singlevar()
{
    int32 fid;                       /* file id */
    int32 dset1;                     /* dataset id */
    int32 dset_index;                /* dataset index */
    int32 dimsizes[3];               /* dimension size buffer */
    int32 start[3],                  /* where to start reading */
        edges[3];                    /* length of data to be read */
    int16 outdata[DIM0][DIM1][DIM2]; /* data read back */
    int16 fillval  = -3;             /* fill value for the variable */
    intn  status   = 0;              /* returned by called functions */
    intn  num_errs = 0;              /* number of errors so far */

    /* result data to compare against read data */
    int16 result[DIM00][DIM1][DIM2] = {{{300, -3}, {-3, -3}, {-3, -3}},     {{301, -3}, {-3, -3}, {-3, -3}},
                                       {{302, -3}, {-3, -3}, {-3, -3}},     {{303, -3}, {-3, -3}, {-3, -3}},
                                       {{-3, -3}, {-3, -3}, {-3, -3}},      {{-3, -3}, {-3, -3}, {-3, -3}},
                                       {{400, -3}, {-3, -3}, {-3, -3}},     {{401, -3}, {-3, -3}, {-3, -3}},
                                       {{800, 801}, {802, 803}, {804, 805}}};

    /* result data to compare against read data; the first two elements will
        be changed to "1,2" later for the last test. */

    /* enter define mode */
    fid = SDstart(FILENAME3, DFACC_CREATE);
    CHECK(fid, FAIL, "SDstart");

    /* Define dimension of the data set to be created. */
    dimsizes[0] = SD_UNLIMITED;
    dimsizes[1] = DIM1;
    dimsizes[2] = DIM2;

    /* Create an array data sets. */
    dset1 = SDcreate(fid, "Variable 3D", DFNT_INT16, 3, dimsizes);
    CHECK(dset1, FAIL, "SDcreate");

    /* Datasets will be filled with fill values when data is missing */
    status = SDsetfillvalue(dset1, (void *)&fillval);
    CHECK(status, FAIL, "SDsetfillvalue");

    { /* Add data */
        int16 data[] = {300, 301, 302, 303};
        int32 startw[3], edgesw[3];

        /* Write 4 elements starting at index 0 */
        startw[0] = startw[1] = startw[2] = 0; /* starting writing at {0,0,0} */
        edgesw[0]                         = 4; /* 4x1x1 slab */
        edgesw[1]                         = 1;
        edgesw[2]                         = 1;
        status                            = SDwritedata(dset1, startw, NULL, edgesw, (void *)data);
        CHECK(status, FAIL, "SDwritedata");
    }

    /* Get information of the dataset, and verify its dimension */
    status = SDgetinfo(dset1, NULL, NULL, dimsizes, NULL, NULL);
    CHECK(status, FAIL, "SDgetinfo");
    VERIFY(dimsizes[0], 4, "SDgetinfo");

    /* Read and verify data of the dataset */
    start[0] = start[1] = start[2] = 0;
    edges[0]                       = dimsizes[0];
    edges[1]                       = DIM1;
    edges[2]                       = DIM2;
    status                         = SDreaddata(dset1, start, NULL, edges, (void *)outdata);
    CHECK(status, FAIL, "SDreaddata");

    status = memcmp(outdata, result, edges[0] * DIM1 * DIM2 * sizeof(int16));
    VERIFY(status, 0, "memcmp");

    /* Close the dataset */
    status = SDendaccess(dset1);
    CHECK(status, FAIL, "SDendaccess");

    status = SDend(fid);
    CHECK(status, FAIL, "SDend");

    /* Reopen file and dataset */
    fid = SDstart(FILENAME3, DFACC_RDWR);
    CHECK(fid, FAIL, "SDstart");
    dset_index = SDnametoindex(fid, "Variable 3D");
    CHECK(dset_index, FAIL, "SDnametoindex");
    dset1 = SDselect(fid, dset_index);
    CHECK(dset1, FAIL, "SDselect");

    { /* Append data to the dataset pass the end */
        int16 data[] = {400, 401};
        int32 startw[3], edgesw[3];

        startw[0] = 6;             /* the end is at 3 */
        startw[1] = startw[2] = 0; /* writing at {6,0,0} */
        edgesw[0]             = 2; /* two slabs */
        edgesw[1] = edgesw[2] = 1;

        /* Write 2 slabs starting at index 6 */
        status = SDwritedata(dset1, startw, NULL, edgesw, (void *)data);
        CHECK(status, FAIL, "SDwritedata");
    }

    /* Get information of the dataset, and verify its dimension */
    status = SDgetinfo(dset1, NULL, NULL, dimsizes, NULL, NULL);
    CHECK(status, FAIL, "SDgetinfo");
    VERIFY(dimsizes[0], 8, "SDgetinfo");

    /* Read and verify data of the dataset */
    /* start[], edges[1], and edges[2] same as last reading */
    edges[0] = dimsizes[0];
    status   = SDreaddata(dset1, start, NULL, edges, (void *)outdata);
    CHECK(status, FAIL, "SDreaddata");

    status = memcmp(outdata, result, edges[0] * DIM1 * DIM2 * sizeof(int16));
    VERIFY(status, 0, "memcmp");

    { /* Append data to the dataset at the end */
        int16 data[] = {800, 801, 802, 803, 804, 805};
        int32 startw[3], edgesw[3];

        startw[0] = dimsizes[0];   /* writing at the end */
        startw[1] = startw[2] = 0; /* writing at {8,0,0} */
        edgesw[0]             = 1; /* 1 slab */
        edgesw[1]             = DIM1;
        edgesw[2]             = DIM2;

        /* Write 2 slabs starting at index 8 */
        status = SDwritedata(dset1, startw, NULL, edgesw, (void *)data);
        CHECK(status, FAIL, "SDwritedata");
    }

    /* Get information of the dataset, and verify its dimension */
    status = SDgetinfo(dset1, NULL, NULL, dimsizes, NULL, NULL);
    CHECK(status, FAIL, "SDgetinfo");
    VERIFY(dimsizes[0], 9, "SDgetinfo");

    /* Read and verify data of the dataset */
    /* start[], edges[1], and edges[2] same as last reading */
    edges[0] = dimsizes[0];
    status   = SDreaddata(dset1, start, NULL, edges, (void *)outdata);
    CHECK(status, FAIL, "SDreaddata");

    status = memcmp(outdata, result, edges[0] * DIM1 * DIM2 * sizeof(int16));
    VERIFY(status, 0, "memcmp");

    /* data should be
            300  -3     301  -3     302  -3     303  -3 ...
             -3  -3      -3  -3      -3  -3      -3  -3 ...
             -3  -3      -3  -3      -3  -3      -3  -3 ...

            ... -3  -3      -3  -3     400  -3     401  -3     800 801
            ... -3  -3      -3  -3      -3  -3      -3  -3     802 803
            ... -3  -3      -3  -3      -3  -3      -3  -3     804 805
            unlimited dimension ---->
            (-3 is fill value)
    */

    /* Close the dataset */
    status = SDendaccess(dset1);
    CHECK(status, FAIL, "SDendaccess");

    /* Close the file */
    status = SDend(fid);
    CHECK(status, FAIL, "SDend");

    return 0;
}

/********************************************************************
   Name: test_1dim_multivars_addon() - tests adding unlimited dimension
                dataset to an existing file

   Description:
        The main contents include:
        - open FILENAME2
        - create a 1-dim unlimited dimension dataset
        - close the file, then reopen it
        - open the previous dataset and create another one
        - write 4 elements to first and 3 to second, starting at index 0
        - append 2 elements to first dataset, starting at index 6, that
          is passed the end
        - append 3 elements to first dataset, immediately at the end of
          the data
        - append 3 elements to second dataset, skipping 5 elements
        - verify data in various places

   Return value:
        The number of errors occurred in this routine.

*********************************************************************/

static int
test_1dim_multivars_addon()
{
    int32 fid;           /* file id */
    int32 dset1, dset2;  /* dataset ids */
    int32 dset_index;    /* dataset index */
    int32 dimsizes[1];   /* dimension size buffer */
    int32 start[1],      /* where to start writing */
        edges[1];        /* length of data to be read/written */
    int16 fillval  = -3; /* fill value for the variable */
    intn  status   = 0;  /* returned by called functions */
    intn  num_errs = 0;  /* number of errors so far */

    /* result data to compare against read data */
    int16 result3[] = {300, 301, 302, 303, -3, -3, 30, 31, 801, 802, 803};
    int16 result4[] = {300, 301, 302, -3, -3, -3, -3, -3, 801, 802, 803};

    /* enter define mode */
    fid = SDstart(FILENAME2, DFACC_RDWR);
    CHECK(fid, FAIL, "SDstart");

    /* Define dimension of the data set to be created. */
    dimsizes[0] = SD_UNLIMITED;

    /* Create an array data sets. */
    dset1 = SDcreate(fid, "Variable 3", DFNT_INT16, 1, dimsizes);
    CHECK(dset1, FAIL, "SDcreate");

    /* Datasets will be filled with fill values when data is missing */
    status = SDsetfillvalue(dset1, (void *)&fillval);
    CHECK(status, FAIL, "SDsetfillvalue");

    /* Close dataset and file */
    status = SDendaccess(dset1);
    CHECK(status, FAIL, "SDendaccess");
    status = SDend(fid);
    CHECK(status, FAIL, "SDend");

    /* Reopen file and dataset */
    fid = SDstart(FILENAME2, DFACC_RDWR);
    CHECK(fid, FAIL, "SDstart");
    dset_index = SDnametoindex(fid, "Variable 3");
    CHECK(dset_index, FAIL, "SDnametoindex");
    dset1 = SDselect(fid, dset_index);
    CHECK(dset1, FAIL, "SDselect");

    /* Create another dataset */
    dset2 = SDcreate(fid, "Variable 4", DFNT_INT16, 1, dimsizes);
    CHECK(dset2, FAIL, "SDcreate");

    /* Datasets will be filled with fill values when data is missing */
    status = SDsetfillvalue(dset2, (void *)&fillval);
    CHECK(status, FAIL, "SDsetfillvalue");

    { /* Add data */
        int16 data[] = {300, 301, 302, 303};

        /* Write 4 elements to "Variable 3" starting at index 0 */
        start[0] = 0;
        edges[0] = 4;
        status   = SDwritedata(dset1, start, NULL, edges, (void *)data);
        CHECK(status, FAIL, "SDwritedata");

        /* Write 3 elements to "Variable 4" starting at index 0 */
        edges[0] = 3;
        status   = SDwritedata(dset2, start, NULL, edges, (void *)data);
        CHECK(status, FAIL, "SDwritedata");
    }

    /* Get information of the datasets, and verify their data and dim sizes */
    num_errs = num_errs + verify_info_data(dset1, 4, result3);
    num_errs = num_errs + verify_info_data(dset2, 3, result4);

    { /* Append data to "Variable 3" pass the end */
        int16 data[] = {30, 31};

        /* Write 2 values starting at index 6, skipping indices 4 and 5 */
        start[0] = 6;
        edges[0] = 2;
        status   = SDwritedata(dset1, start, NULL, edges, (void *)data);
        CHECK(status, FAIL, "SDwritedata");
    }

    /* Get information of the dataset, and verify its data and dim size */
    num_errs = num_errs + verify_info_data(dset1, 8, result3);

    { /* Append data to "Variable 3" again, but right at the end */
        int16 data[] = {801, 802, 803};

        /* Write 3 values starting at index 8, at the end */
        start[0] = 8;
        edges[0] = 3;
        status   = SDwritedata(dset1, start, NULL, edges, (void *)data);
        CHECK(status, FAIL, "SDwritedata");
    }

    /* Get information of "Variable 3", and verify its dimension */
    num_errs = num_errs + verify_info_data(dset1, 11, result3);

    { /* Append data to "Variable 4" at an arbitrary index, skipping a few */
        int16 data[] = {801, 802, 803};

        /* Write 3 values starting at index 8, at the end */
        start[0] = 8;
        edges[0] = 3;
        status   = SDwritedata(dset2, start, NULL, edges, (void *)data);
        CHECK(status, FAIL, "SDwritedata");
    }

    /* Get information of the "Variable 4" and verify its data and dim size */
    num_errs = num_errs + verify_info_data(dset2, 11, result4);

    { /* Read and verify data from dataset "Variable 2" that was created in
         test_1dim_multivars */
        int32 dset;
        int16 result2[] = {102, 104, -2, -2, -2, -2, -2, -2, 200, 201, 202, 800, 801, 802, 803};

        /* Get access to dataset "Variable 2" */
        dset_index = SDnametoindex(fid, "Variable 2");
        CHECK(dset_index, FAIL, "SDnametoindex");
        dset = SDselect(fid, dset_index);
        CHECK(dset, FAIL, "SDselect");

        /* Get its information and verify its data and dimension size */
        num_errs = num_errs + verify_info_data(dset, 15, result2);

        /* Close "Variable 2" */
        status = SDendaccess(dset);
        CHECK(status, FAIL, "SDendaccess");
    } /* end reading "Variable 2" */

    /* Close all datasets */
    status = SDendaccess(dset1);
    CHECK(status, FAIL, "SDendaccess");
    status = SDendaccess(dset2);
    CHECK(status, FAIL, "SDendaccess");

    /* Close the file */
    status = SDend(fid);
    CHECK(status, FAIL, "SDend");

    return 0;
} /* test_1dim_multivars_addon */

/* Test driver for testing reading/writing variables with unlimited dimension
   using SD API. */
extern int
test_unlim()
{
    int num_errs = 0;

    /* Output message about test being performed */
    TESTING("read/write datasets with unlimited dims via SD API (tunlim.c)");

    /* Test single variable with 1 unlimited dimension */
    num_errs = num_errs + test_1dim_singlevar();

    /* Test multiple variables with 1 unlimited dimension */
    num_errs = num_errs + test_1dim_multivars();

    /* Test multiple variables with multiple dimensions */
    num_errs = num_errs + test_multidim_singlevar();

    /* Test multiple variables created at different time */
    num_errs = num_errs + test_1dim_multivars_addon();

    if (num_errs == 0)
        PASSED();
    else
        H4_FAILED();

    /* Return the number of errors that's been kept track of so far */
    return num_errs;
}