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

int main( int argc, char *argv[] )
{
    int errs = 0;
    int position, pack_size, i;
    int dis[2], blklens[2];
    MPI_Datatype type;
    int send_buffer[60];
    int recv_buffer[60];
    int pack_buffer[1000];

    MTest_Init( &argc, &argv );

    /* Initialize data in the buffers */
    for (i=0; i<60; i++) {
	send_buffer[i] = i;
	recv_buffer[i] = -1;
	pack_buffer[i] = -2;
    }

    /* Create an indexed type with an empty first block */
    dis[0] = 0;
    dis[1] = 20;

    blklens[0] = 0;
    blklens[1] = 40;

    MPI_Type_indexed(2, blklens, dis, MPI_INT, &type);
    MPI_Type_commit(&type);

    position = 0;
    MPI_Pack( send_buffer, 1, type, pack_buffer, sizeof(pack_buffer), 
	      &position, MPI_COMM_WORLD );
    pack_size = position;
    position = 0;
    MPI_Unpack( pack_buffer, pack_size, &position, recv_buffer, 1, type, 
		MPI_COMM_WORLD );

    /* Check that the last 40 entries of the recv_buffer have the corresponding
       elements from the send buffer */
    for (i=0; i<20; i++) {
	if (recv_buffer[i] != -1) {
	    errs++;
	    fprintf( stderr, "recv_buffer[%d] = %d, should = -1\n", i, 
		     recv_buffer[i] );
	}
    }
    for (i=20; i<60; i++) {
	if (recv_buffer[i] != i) {
	    errs++;
	    fprintf( stderr, "recv_buffer[%d] = %d, should = %d\n", i, 
		     recv_buffer[i], i );
	}
    }
    MPI_Type_free( &type );

    MTest_Finalize( errs );
    MPI_Finalize();
    return 0;

}
