/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil -*- */
/*
 * Copyright (c) 2004-2007 The Trustees of Indiana University and Indiana
 *                         University Research and Technology
 *                         Corporation.  All rights reserved.
 * Copyright (c) 2004-2017 The University of Tennessee and The University
 *                         of Tennessee Research Foundation.  All rights
 *                         reserved.
 * Copyright (c) 2004-2008 High Performance Computing Center Stuttgart,
 *                         University of Stuttgart.  All rights reserved.
 * Copyright (c) 2004-2005 The Regents of the University of California.
 *                         All rights reserved.
 * Copyright (c) 2007-2009 Cisco Systems, Inc.  All rights reserved.
 * Copyright (c) 2012-2013 Los Alamos National Security, LLC.  All rights
 *                         reserved.
 * Copyright (c) 2012-2013 Inria.  All rights reserved.
 * Copyright (c) 2014-2015 Research Organization for Information Science
 *                         and Technology (RIST). All rights reserved.
 * $COPYRIGHT$
 *
 * Additional copyrights may follow
 *
 * $HEADER$
 */
#include "ompi_config.h"
#include <stdio.h>

#include "ompi/mpi/c/bindings.h"
#include "ompi/runtime/params.h"
#include "ompi/communicator/communicator.h"
#include "ompi/errhandler/errhandler.h"
#include "ompi/mca/topo/topo.h"
#include "ompi/memchecker.h"

#if OMPI_BUILD_MPI_PROFILING
#if OPAL_HAVE_WEAK_SYMBOLS
#pragma weak MPI_Cart_sub = PMPI_Cart_sub
#endif
#define MPI_Cart_sub PMPI_Cart_sub
#endif

static const char FUNC_NAME[] = "MPI_Cart_sub";


int MPI_Cart_sub(MPI_Comm comm, const int remain_dims[], MPI_Comm *new_comm)
{
    int err;

    MEMCHECKER(
        memchecker_comm(comm);
    );

    /* check the arguments */
    if (MPI_PARAM_CHECK) {
        OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
        if (ompi_comm_invalid(comm)) {
            return OMPI_ERRHANDLER_INVOKE (MPI_COMM_WORLD, MPI_ERR_COMM,
                                          FUNC_NAME);
        }
        if (OMPI_COMM_IS_INTER(comm)) {
            return OMPI_ERRHANDLER_INVOKE (comm, MPI_ERR_COMM,
                                          FUNC_NAME);
        }
        if (((NULL == remain_dims) && (0 != comm->c_topo->mtc.cart->ndims))
            && (NULL == new_comm)) {
            return OMPI_ERRHANDLER_INVOKE (comm, MPI_ERR_ARG,
                                          FUNC_NAME);
        }
    }

    if (!OMPI_COMM_IS_CART(comm)) {
        return OMPI_ERRHANDLER_INVOKE (comm, MPI_ERR_TOPOLOGY,
                                      FUNC_NAME);
    }

#if OPAL_ENABLE_FT_MPI
    /*
     * An early check, so as to return early if we are using a broken
     * communicator. This is not absolutely necessary since we will
     * check for this, and other, error conditions during the operation.
     */
    if( OPAL_UNLIKELY(!ompi_comm_iface_create_check(comm, &err)) ) {
        OMPI_ERRHANDLER_RETURN(err, comm, err, FUNC_NAME);
    }
#endif

    err = comm->c_topo->topo.cart.cart_sub(comm, remain_dims, new_comm);

    OMPI_ERRHANDLER_RETURN(err, comm, err, FUNC_NAME);
}