openmpi/ompi/mpi/c/info_get_valuelen.c

/*
 * 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.
 * $COPYRIGHT$
 * 
 * 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_valuelen = PMPI_Info_get_valuelen
#endif

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

static const char FUNC_NAME[] = "MPI_Info_get_valuelen";


/**
 *   MPI_Info_get_valuelen - Get the length of a value for a given key in an 'M
 *
 *   @param info - info object (handle)
 *   @param key - null-terminated character string of the index key
 *   @param valuelen - length of the value associated with 'key' (integer)
 *   @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
 *
 *   The length returned in C and C++ does not include the end-of-string
 *   character.  If the 'key' is not found on 'info', 'valuelen' is left 
 *   alone.
 */
int MPI_Info_get_valuelen(MPI_Info info, char *key, int *valuelen,
                          int *flag) 
{
    int key_length;
    int err;

    /*
     * Simple function. All we need to do is search for the value
     * having the "key" associated with it and return the length
     */
    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);
        }
        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 == flag || NULL == valuelen) {
            return OMPI_ERRHANDLER_INVOKE(MPI_COMM_WORLD, MPI_ERR_ARG,
                                          FUNC_NAME);
        }
    }

    OPAL_CR_ENTER_LIBRARY();

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