/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
 *
 *  (C) 2001 by Argonne National Laboratory.
 *      See COPYRIGHT in top-level directory.
 */

#include "mpiimpl.h"
#include "topo.h"

/* -- Begin Profiling Symbol Block for routine MPI_Cartdim_get */
#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_Cartdim_get = PMPI_Cartdim_get
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_Cartdim_get  MPI_Cartdim_get
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_Cartdim_get as PMPI_Cartdim_get
#elif defined(HAVE_WEAK_ATTRIBUTE)
int MPI_Cartdim_get(MPI_Comm comm, int *ndims) __attribute__((weak,alias("PMPI_Cartdim_get")));
#endif
/* -- End Profiling Symbol Block */

/* Define MPICH_MPI_FROM_PMPI if weak symbols are not supported to build
   the MPI routines */
#ifndef MPICH_MPI_FROM_PMPI
#undef MPI_Cartdim_get
#define MPI_Cartdim_get PMPI_Cartdim_get

#endif

#undef FUNCNAME
#define FUNCNAME MPI_Cartdim_get

/*@

MPI_Cartdim_get - Retrieves Cartesian topology information associated with a 
                  communicator

Input Parameters:
. comm - communicator with cartesian structure (handle) 

Output Parameters:
. ndims - number of dimensions of the cartesian structure (integer) 

.N SignalSafe

.N Fortran

.N Errors
.N MPI_SUCCESS
.N MPI_ERR_COMM
.N MPI_ERR_ARG
@*/
int MPI_Cartdim_get(MPI_Comm comm, int *ndims)
{
    static const char FCNAME[] = "MPI_Cartdim_get";
    int mpi_errno = MPI_SUCCESS;
    MPID_Comm *comm_ptr = NULL;
    MPIR_Topology *cart_ptr;
    MPID_MPI_STATE_DECL(MPID_STATE_MPI_CARTDIM_GET);

    MPIR_ERRTEST_INITIALIZED_ORDIE();
    
    MPID_MPI_FUNC_ENTER(MPID_STATE_MPI_CARTDIM_GET);
    
    /* Validate parameters, especially handles needing to be converted */
#   ifdef HAVE_ERROR_CHECKING
    {
        MPID_BEGIN_ERROR_CHECKS;
        {
	    MPIR_ERRTEST_COMM(comm, mpi_errno);
        }
        MPID_END_ERROR_CHECKS;
    }
#   endif
    
    /* Convert MPI object handles to object pointers */
    MPID_Comm_get_ptr( comm, comm_ptr );

    /* Validate parameters and objects (post conversion) */
#   ifdef HAVE_ERROR_CHECKING
    {
        MPID_BEGIN_ERROR_CHECKS;
        {
	    MPIR_ERRTEST_ARGNULL(ndims,"ndims",mpi_errno);
            /* Validate comm_ptr */
            MPID_Comm_valid_ptr( comm_ptr, mpi_errno, TRUE );
	    /* If comm_ptr is not valid, it will be reset to null */
            if (mpi_errno) goto fn_fail;
        }
        MPID_END_ERROR_CHECKS;
    }
#   endif /* HAVE_ERROR_CHECKING */

    /* ... body of routine ...  */
    
    cart_ptr = MPIR_Topology_get( comm_ptr );

    MPIR_ERR_CHKANDJUMP((!cart_ptr || cart_ptr->kind != MPI_CART), mpi_errno, MPI_ERR_TOPOLOGY, "**notcarttopo");

    *ndims = cart_ptr->topo.cart.ndims;
    
    /* ... end of body of routine ... */

  fn_exit:
    MPID_MPI_FUNC_EXIT(MPID_STATE_MPI_CARTDIM_GET);
    return mpi_errno;

  fn_fail:
    /* --BEGIN ERROR HANDLING-- */
#   ifdef HAVE_ERROR_CHECKING
    {
	mpi_errno = MPIR_Err_create_code(
	    mpi_errno, MPIR_ERR_RECOVERABLE, FCNAME, __LINE__, MPI_ERR_OTHER, "**mpi_cartdim_get",
	    "**mpi_cartdim_get %C %p", comm, ndims);
    }
#   endif
    mpi_errno = MPIR_Err_return_comm( comm_ptr, FCNAME, mpi_errno );
    goto fn_exit;
    /* --END ERROR HANDLING-- */
}
