/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
 *  (C) 2001 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */
#include "mpi.h"
#include <math.h>
#include <stdio.h>
#include <stdlib.h>
#include "mpitest.h"
#include "mpitestconf.h"
#ifdef HAVE_STRING_H
#include <string.h>
#endif

static int verbose = 0;

int main(int argc, char *argv[]);
int parse_args(int argc, char **argv);

int main(int argc, char *argv[])
{
    /* Variable declarations */
    int a[100][100], b[100][100];
    MPI_Datatype row, xpose;
    MPI_Aint sizeofint;

    int errs = 0;
    int bufsize, position = 0;
    void *buffer;

    int i, j;

    /* Initialize a to some known values. */
    for (i = 0; i < 100; i++) {
        for (j = 0; j < 100; j++) {
            a[i][j] = i * 1000 + j;
            b[i][j] = -1;
        }
    }

    /* Initialize MPI */
    MPI_Init(&argc, &argv);
    parse_args(argc, argv);

    MPI_Type_extent(MPI_INT, &sizeofint);

    /* Create datatypes. */
    MPI_Type_vector(100, 1, 100, MPI_INT, &row);
    MPI_Type_hvector(100, 1, sizeofint, row, &xpose);
    MPI_Type_commit(&xpose);

    /* Pack it. */
    MPI_Pack_size(1, xpose, MPI_COMM_WORLD, &bufsize);
    buffer = (char *) malloc((unsigned) bufsize);

    /* To improve reporting of problems about operations, we
     * change the error handler to errors return */
    MPI_Comm_set_errhandler(MPI_COMM_WORLD, MPI_ERRORS_RETURN);

    MPI_Pack(a, 1, xpose, buffer, bufsize, &position, MPI_COMM_WORLD);

    /* Unpack the buffer into b. */
    position = 0;
    MPI_Unpack(buffer, bufsize, &position, b, 100 * 100, MPI_INT, MPI_COMM_WORLD);

    for (i = 0; i < 100; i++) {
        for (j = 0; j < 100; j++) {
            if (b[i][j] != a[j][i]) {
                errs++;
                if (verbose)
                    fprintf(stderr, "b[%d][%d] = %d, should be %d\n", i, j, b[i][j], a[j][i]);
            }
        }
    }

    MPI_Type_free(&xpose);
    MPI_Type_free(&row);

    /* print message and exit */
    if (errs) {
        fprintf(stderr, "Found %d errors\n", errs);
    }
    else {
        printf(" No Errors\n");
    }
    free(buffer);
    MPI_Finalize();
    return 0;
}


int parse_args(int argc, char **argv)
{
    /*
     * int ret;
     *
     * while ((ret = getopt(argc, argv, "v")) >= 0)
     * {
     * switch (ret) {
     * case 'v':
     * verbose = 1;
     * break;
     * }
     * }
     */
    if (argc > 1 && strcmp(argv[1], "-v") == 0)
        verbose = 1;
    return 0;
}
