openmpi/ompi/mpi/c/info_get.c

/* -*- 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) 2004-2005 The University of Tennessee and The University
 *                         of Tennessee Research Foundation.  All rights
 *                         reserved.
 * Copyright (c) 2004-2005 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) 2013      Los Alamos National Security, LLC.  All rights
 *                         reserved.
 * $COPYRIGHT$
 * 
 * Additional copyrights may follow
 * 
 * $HEADER$
 */

#include "ompi_config.h"

#include "ompi/mpi/c/bindings.h"
#include "ompi/runtime/params.h"
#include "ompi/communicator/communicator.h"
#include "ompi/errhandler/errhandler.h"
#include "ompi/info/info.h"
#include <stdlib.h>
#include <string.h>

#if OPAL_HAVE_WEAK_SYMBOLS && OMPI_PROFILING_DEFINES
#pragma weak MPI_Info_get = PMPI_Info_get
#endif

#if OMPI_PROFILING_DEFINES
#include "ompi/mpi/c/profile/defines.h"
#endif

static const char FUNC_NAME[] = "MPI_Info_get";

/**
 *   MPI_Info_get - Get a (key, value) pair from an 'MPI_Info' object
 *
 *   @param info info object (handle)
 *   @param key null-terminated character string of the index key
 *   @param valuelen maximum length of 'value' (integer)
 *   @param value null-terminated character string of the value
 *   @param flag true (1) if 'key' defined on 'info', false (0) if not
 *               (logical)
 *
 *   @retval MPI_SUCCESS
 *   @retval MPI_ERR_ARG
 *   @retval MPI_ERR_INFO
 *   @retval MPI_ERR_INFO_KEY
 *   @retval MPI_ERR_INFO_VALUE
 *
 *   In C and C++, 'valuelen' should be one less than the allocated space
 *   to allow for for the null terminator.
 */
int MPI_Info_get(MPI_Info info, const char *key, int valuelen,
                 char *value, int *flag) 
{
    int err;
    int key_length;

    /*
     * Simple function. All we need to do is search for the value
     * having the "key" associated with it and then populate the
     * necessary structures.
     */
    if (MPI_PARAM_CHECK) {
        OMPI_ERR_INIT_FINALIZE(FUNC_NAME);
        if (NULL == info || MPI_INFO_NULL == info ||
            ompi_info_is_freed(info)) {
            return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_INFO,
                                          FUNC_NAME);
        }
        if (0 > valuelen){
            return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_ARG,
                                          FUNC_NAME);
        }

        key_length = (key) ? (int)strlen (key) : 0;
        if ((NULL == key) || (0 == key_length) ||
            (MPI_MAX_INFO_KEY <= key_length)) {
            return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_INFO_KEY,
                                          FUNC_NAME);
        }
        if (NULL == value) {
            return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_INFO_VALUE,
                                          FUNC_NAME);
        }
        if (NULL == flag) {
            return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_ARG,
                                          FUNC_NAME);
        }
    }

    OPAL_CR_ENTER_LIBRARY();

    err = ompi_info_get (info, key, valuelen, value, flag);
    OMPI_ERRHANDLER_RETURN(err, MPI_COMM_WORLD, err, FUNC_NAME);
}