/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */

/*

 *  (C) 2008 by Argonne National Laboratory.

 *      See COPYRIGHT in top-level directory.

 */

#include "mpi.h"

#include <stdio.h>

#include <string.h>

#include <stdlib.h>

#include "mpitest.h"

/*

static char MTEST_Descrip[] = "Test file views with MPI_Type_create_resized";

*/

int main(int argc, char **argv)

{

    int i, nprocs, len, mpi_errno, buf[2], newbuf[4];

    int errs = 0;

    MPI_Offset size;

    MPI_Aint lb, extent;

    MPI_File fh;

    char *filename;

    MPI_Datatype newtype;

    MTest_Init(&argc, &argv);

    MPI_Comm_size(MPI_COMM_WORLD, &nprocs);

    if (nprocs != 1) {

        fprintf(stderr, "Run this program on 1 process\n");

        MPI_Abort(MPI_COMM_WORLD, 1);

    }

    i = 1;

    while ((i < argc) && strcmp("-fname", *argv)) {

        i++;

        argv++;

    }

    if (i >= argc) {

        len = 8;

        filename = (char *) malloc(len + 10);

        strcpy(filename, "testfile");

        /*

         * fprintf(stderr, "\n*#  Usage: resized -fname filename\n\n");

         * MPI_Abort(MPI_COMM_WORLD, 1);

         */

    } else {

        argv++;

        len = (int) strlen(*argv);

        filename = (char *) malloc(len + 1);

        strcpy(filename, *argv);

    }

    MPI_File_delete(filename, MPI_INFO_NULL);

    /* create a resized type comprising an integer with an lb at sizeof(int) and extent = 3*sizeof(int) */

    lb = sizeof(int);

    extent = 3 * sizeof(int);

    MPI_Type_create_resized(MPI_INT, lb, extent, &newtype);

    MPI_Type_commit(&newtype);

    /* initialize the file */

    MPI_File_open(MPI_COMM_WORLD, filename, MPI_MODE_CREATE | MPI_MODE_RDWR, MPI_INFO_NULL, &fh;;

    for (i = 0; i < 4; i++)

        newbuf[i] = 55;

    MPI_File_write(fh, newbuf, 4, MPI_INT, MPI_STATUS_IGNORE);

    MPI_File_close(&fh;;

    /* write 2 ints into file view with resized type */

    buf[0] = 10;

    buf[1] = 20;

    MPI_File_open(MPI_COMM_WORLD, filename, MPI_MODE_CREATE | MPI_MODE_RDWR, MPI_INFO_NULL, &fh;;

    mpi_errno = MPI_File_set_view(fh, 0, MPI_INT, newtype, (char *) "native", MPI_INFO_NULL);

    if (mpi_errno != MPI_SUCCESS)

        errs++;

    MPI_File_write(fh, buf, 2, MPI_INT, MPI_STATUS_IGNORE);

    MPI_File_close(&fh;;

    /* read back file view with resized type  and verify */

    MPI_File_open(MPI_COMM_WORLD, filename, MPI_MODE_RDONLY, MPI_INFO_NULL, &fh;;

    mpi_errno = MPI_File_set_view(fh, 0, MPI_INT, newtype, (char *) "native", MPI_INFO_NULL);

    if (mpi_errno != MPI_SUCCESS)

        errs++;

    for (i = 0; i < 4; i++)

        newbuf[i] = 100;

    MPI_File_read(fh, newbuf, 2, MPI_INT, MPI_STATUS_IGNORE);

    if ((newbuf[0] != 10) || (newbuf[1] != 20) || (newbuf[2] != 100) || (newbuf[3] != 100)) {

        errs++;

        fprintf(stderr,

                "newbuf[0] is %d, should be 10,\n newbuf[1] is %d, should be 20\n newbuf[2] is %d, should be 100,\n newbuf[3] is %d, should be 100,\n",

                newbuf[0], newbuf[1], newbuf[2], newbuf[3]);

    }

    MPI_File_close(&fh;;

    /* read file back and verify */

    MPI_File_open(MPI_COMM_WORLD, filename, MPI_MODE_RDONLY, MPI_INFO_NULL, &fh;;

    MPI_File_get_size(fh, &size);

    if (size != 4 * sizeof(int)) {

        errs++;

        fprintf(stderr, "file size is %lld, should be %d\n", size, (int) (4 * sizeof(int)));

    }

    for (i = 0; i < 4; i++)

        newbuf[i] = 100;

    MPI_File_read(fh, newbuf, 4, MPI_INT, MPI_STATUS_IGNORE);

    if ((newbuf[0] != 10) || (newbuf[3] != 20) || (newbuf[1] != 55) || (newbuf[2] != 55)) {

        errs++;

        fprintf(stderr,

                "newbuf[0] is %d, should be 10,\n newbuf[1] is %d, should be 55,\n newbuf[2] is %d, should be 55,\n newbuf[3] is %d, should be 20\n",

                newbuf[0], newbuf[1], newbuf[2], newbuf[3]);

    }

    MPI_File_close(&fh;;

    MPI_Type_free(&newtype);

    free(filename);

    MTest_Finalize(errs);

    return MTestReturnValue(errs);

}