/* -*- 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 "mpir_info.h"

/* -- Begin Profiling Symbol Block for routine MPI_Info_get */
#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_Info_get = PMPI_Info_get
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_Info_get  MPI_Info_get
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_Info_get as PMPI_Info_get
#elif defined(HAVE_WEAK_ATTRIBUTE)
int MPI_Info_get(MPI_Info info, const char *key, int valuelen, char *value, int *flag)
    __attribute__ ((weak, alias("PMPI_Info_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_Info_get
#define MPI_Info_get PMPI_Info_get

#undef FUNCNAME
#define FUNCNAME MPIR_Info_get_impl
#undef FCNAME
#define FCNAME MPL_QUOTE(FUNCNAME)
int MPIR_Info_get_impl(MPIR_Info * info_ptr, const char *key, int valuelen, char *value, int *flag)
{
    MPIR_Info *curr_ptr;
    int err = 0, mpi_errno = 0;

    curr_ptr = info_ptr->next;
    *flag = 0;

    while (curr_ptr) {
        if (!strncmp(curr_ptr->key, key, MPI_MAX_INFO_KEY)) {
            err = MPL_strncpy(value, curr_ptr->value, valuelen + 1);
            /* +1 because the MPI Standard says "In C, valuelen
             * (passed to MPI_Info_get) should be one less than the
             * amount of allocated space to allow for the null
             * terminator*/
            *flag = 1;
            break;
        }
        curr_ptr = curr_ptr->next;
    }

    /* --BEGIN ERROR HANDLING-- */
    if (err != 0) {
        mpi_errno =
            MPIR_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE, FCNAME, __LINE__,
                                 MPI_ERR_INFO_VALUE, "**infovallong", NULL);
    }
    /* --END ERROR HANDLING-- */

    return mpi_errno;
}

#endif

/*@
    MPI_Info_get - Retrieves the value associated with a key

Input Parameters:
+ info - info object (handle)
. key - key (string)
- valuelen - length of value argument, not including null terminator (integer)

Output Parameters:
+ value - value (string)
- flag - true if key defined, false if not (boolean)


.N ThreadSafeInfoRead

.N Fortran

.N Errors
.N MPI_SUCCESS
.N MPI_ERR_OTHER
.N MPI_ERR_INFO_KEY
.N MPI_ERR_ARG
.N MPI_ERR_INFO_VALUE
@*/
#undef FUNCNAME
#define FUNCNAME MPI_Info_get
#undef FCNAME
#define FCNAME MPL_QUOTE(FUNCNAME)
int MPI_Info_get(MPI_Info info, const char *key, int valuelen, char *value, int *flag)
{
    MPIR_Info *info_ptr = 0;
    int mpi_errno = MPI_SUCCESS;
    MPIR_FUNC_TERSE_STATE_DECL(MPID_STATE_MPI_INFO_GET);

    MPIR_ERRTEST_INITIALIZED_ORDIE();

    MPID_THREAD_CS_ENTER(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);
    MPIR_FUNC_TERSE_ENTER(MPID_STATE_MPI_INFO_GET);

    /* Validate parameters, especially handles needing to be converted */
#ifdef HAVE_ERROR_CHECKING
    {
        MPID_BEGIN_ERROR_CHECKS;
        {
            MPIR_ERRTEST_INFO(info, mpi_errno);
        }
        MPID_END_ERROR_CHECKS;
    }
#endif /* HAVE_ERROR_CHECKING */

    /* Convert MPI object handles to object pointers */
    MPIR_Info_get_ptr(info, info_ptr);

    /* Validate parameters and objects (post conversion) */
#ifdef HAVE_ERROR_CHECKING
    {
        MPID_BEGIN_ERROR_CHECKS;
        {
            int keylen;

            /* Validate info_ptr */
            MPIR_Info_valid_ptr(info_ptr, mpi_errno);
            if (mpi_errno)
                goto fn_fail;

            /* Check key */
            MPIR_ERR_CHKANDJUMP((!key), mpi_errno, MPI_ERR_INFO_KEY, "**infokeynull");
            keylen = (int) strlen(key);
            MPIR_ERR_CHKANDJUMP((keylen > MPI_MAX_INFO_KEY), mpi_errno,
                                MPI_ERR_INFO_KEY, "**infokeylong");
            MPIR_ERR_CHKANDJUMP((keylen == 0), mpi_errno, MPI_ERR_INFO_KEY, "**infokeyempty");

            /* Check value arguments */
            MPIR_ERRTEST_ARGNEG(valuelen, "valuelen", mpi_errno);
            MPIR_ERR_CHKANDSTMT((!value), mpi_errno, MPI_ERR_INFO_VALUE, goto fn_fail,
                                "**infovalnull");
        }
        MPID_END_ERROR_CHECKS;
    }
#endif /* HAVE_ERROR_CHECKING */

    /* ... body of routine ...  */
    mpi_errno = MPIR_Info_get_impl(info_ptr, key, valuelen, value, flag);
    /* ... end of body of routine ... */
    if (mpi_errno)
        goto fn_fail;

  fn_exit:
    MPIR_FUNC_TERSE_EXIT(MPID_STATE_MPI_INFO_GET);
    MPID_THREAD_CS_EXIT(GLOBAL, MPIR_THREAD_GLOBAL_ALLFUNC_MUTEX);
    return mpi_errno;

    /* --BEGIN ERROR HANDLING-- */
  fn_fail:
#ifdef HAVE_ERROR_CHECKING
    {
        mpi_errno = MPIR_Err_create_code(mpi_errno, MPIR_ERR_RECOVERABLE,
                                         FCNAME, __LINE__, MPI_ERR_OTHER,
                                         "**mpi_info_get",
                                         "**mpi_info_get %I %s %d %p %p", info, key, valuelen,
                                         value, flag);
    }
    mpi_errno = MPIR_Err_return_comm(NULL, FCNAME, mpi_errno);
#endif
    goto fn_exit;
    /* --END ERROR HANDLING-- */
}