/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
 *
 *   Copyright (C) 1997 University of Chicago.
 *   See COPYRIGHT notice in top-level directory.
 */

#include "mpioimpl.h"

#ifdef HAVE_WEAK_SYMBOLS

#if defined(HAVE_PRAGMA_WEAK)
#pragma weak MPI_File_set_view = PMPI_File_set_view
#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
#pragma _HP_SECONDARY_DEF PMPI_File_set_view MPI_File_set_view
#elif defined(HAVE_PRAGMA_CRI_DUP)
#pragma _CRI duplicate MPI_File_set_view as PMPI_File_set_view
/* end of weak pragmas */
#elif defined(HAVE_WEAK_ATTRIBUTE)
int MPI_File_set_view(MPI_File fh, MPI_Offset disp, MPI_Datatype etype, MPI_Datatype filetype,
                      const char *datarep, MPI_Info info)
    __attribute__ ((weak, alias("PMPI_File_set_view")));
#endif

/* Include mapping from MPI->PMPI */
#define MPIO_BUILD_PROFILING
#include "mpioprof.h"
#endif

/*@
    MPI_File_set_view - Sets the file view

Input Parameters:
. fh - file handle (handle)
. disp - displacement (nonnegative integer)
. etype - elementary datatype (handle)
. filetype - filetype (handle)
. datarep - data representation (string)
. info - info object (handle)

.N fortran
@*/
int MPI_File_set_view(MPI_File fh, MPI_Offset disp, MPI_Datatype etype,
                      MPI_Datatype filetype, ROMIO_CONST char *datarep, MPI_Info info)
{
    int error_code = MPI_SUCCESS;
    MPI_Count filetype_size, etype_size;
    static char myname[] = "MPI_FILE_SET_VIEW";
    ADIO_Offset shared_fp, byte_off;
    ADIO_File adio_fh;

    ROMIO_THREAD_CS_ENTER();

    adio_fh = MPIO_File_resolve(fh);

    /* --BEGIN ERROR HANDLING-- */
    MPIO_CHECK_FILE_HANDLE(adio_fh, myname, error_code);

    if ((disp < 0) && (disp != MPI_DISPLACEMENT_CURRENT)) {
        error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
                                          myname, __LINE__, MPI_ERR_ARG, "**iobaddisp", 0);
        error_code = MPIO_Err_return_file(adio_fh, error_code);
        goto fn_exit;
    }

    /* rudimentary checks for incorrect etype/filetype. */
    if (etype == MPI_DATATYPE_NULL) {
        error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
                                          myname, __LINE__, MPI_ERR_ARG, "**ioetype", 0);
        error_code = MPIO_Err_return_file(adio_fh, error_code);
        goto fn_exit;
    }
    MPIO_DATATYPE_ISCOMMITTED(etype, error_code);
    if (error_code != MPI_SUCCESS) {
        error_code = MPIO_Err_return_file(adio_fh, error_code);
        goto fn_exit;
    }

    if (filetype == MPI_DATATYPE_NULL) {
        error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
                                          myname, __LINE__, MPI_ERR_ARG, "**iofiletype", 0);
        error_code = MPIO_Err_return_file(adio_fh, error_code);
        goto fn_exit;
    }
    MPIO_DATATYPE_ISCOMMITTED(filetype, error_code);
    if (error_code != MPI_SUCCESS) {
        error_code = MPIO_Err_return_file(adio_fh, error_code);
        goto fn_exit;
    }

    if ((adio_fh->access_mode & MPI_MODE_SEQUENTIAL) && (disp != MPI_DISPLACEMENT_CURRENT)) {
        error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
                                          myname, __LINE__, MPI_ERR_ARG, "**iodispifseq", 0);
        error_code = MPIO_Err_return_file(adio_fh, error_code);
        goto fn_exit;
    }

    if ((disp == MPI_DISPLACEMENT_CURRENT) && !(adio_fh->access_mode & MPI_MODE_SEQUENTIAL)) {
        error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
                                          myname, __LINE__, MPI_ERR_ARG, "**iodispifseq", 0);
        error_code = MPIO_Err_return_file(adio_fh, error_code);
        goto fn_exit;
    }
    MPIO_CHECK_INFO_ALL(info, error_code, adio_fh->comm);
    /* --END ERROR HANDLING-- */

    MPI_Type_size_x(filetype, &filetype_size);
    MPI_Type_size_x(etype, &etype_size);

    /* --BEGIN ERROR HANDLING-- */
    if (etype_size != 0 && filetype_size % etype_size != 0) {
        error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
                                          myname, __LINE__, MPI_ERR_ARG, "**iofiletype", 0);
        error_code = MPIO_Err_return_file(adio_fh, error_code);
        goto fn_exit;
    }

    if ((datarep == NULL) || (strcmp(datarep, "native") &&
                              strcmp(datarep, "NATIVE") &&
                              strcmp(datarep, "external32") &&
                              strcmp(datarep, "EXTERNAL32") &&
                              strcmp(datarep, "internal") && strcmp(datarep, "INTERNAL"))) {
        error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
                                          myname, __LINE__,
                                          MPI_ERR_UNSUPPORTED_DATAREP, "**unsupporteddatarep", 0);
        error_code = MPIO_Err_return_file(adio_fh, error_code);
        goto fn_exit;
    }
    /* --END ERROR HANDLING-- */

    if (disp == MPI_DISPLACEMENT_CURRENT) {
        MPI_Barrier(adio_fh->comm);
        ADIO_Get_shared_fp(adio_fh, 0, &shared_fp, &error_code);
        /* TODO: check error code */

        MPI_Barrier(adio_fh->comm);
        ADIOI_Get_byte_offset(adio_fh, shared_fp, &byte_off);
        /* TODO: check error code */

        disp = byte_off;
    }

    ADIO_Set_view(adio_fh, disp, etype, filetype, info, &error_code);

    /* --BEGIN ERROR HANDLING-- */
    if (error_code != MPI_SUCCESS) {
        error_code = MPIO_Err_return_file(adio_fh, error_code);
        goto fn_exit;
    }
    /* --END ERROR HANDLING-- */

    /* reset shared file pointer to zero */
    if (ADIO_Feature(adio_fh, ADIO_SHARED_FP) && (adio_fh->shared_fp_fd != ADIO_FILE_NULL)) {
        /* only one process needs to set it to zero, but I don't want to
         * create the shared-file-pointer file if shared file pointers have
         * not been used so far. Therefore, every process that has already
         * opened the shared-file-pointer file sets the shared file pointer
         * to zero. If the file was not opened, the value is automatically
         * zero. Note that shared file pointer is stored as no. of etypes
         * relative to the current view, whereas indiv. file pointer is
         * stored in bytes. */

        ADIO_Set_shared_fp(adio_fh, 0, &error_code);
        /* --BEGIN ERROR HANDLING-- */
        if (error_code != MPI_SUCCESS)
            error_code = MPIO_Err_return_file(adio_fh, error_code);
        /* --END ERROR HANDLING-- */
    }

    if (ADIO_Feature(adio_fh, ADIO_SHARED_FP)) {
        MPI_Barrier(adio_fh->comm);     /* for above to work correctly */
    }
    if (strcmp(datarep, "external32") && strcmp(datarep, "EXTERNAL32"))
        adio_fh->is_external32 = 0;
    else
        adio_fh->is_external32 = 1;

  fn_exit:
    ROMIO_THREAD_CS_EXIT();

    return error_code;
  fn_fail:
    /* --BEGIN ERROR HANDLING-- */
    error_code = MPIO_Err_return_file(fh, error_code);
    goto fn_exit;
    /* --END ERROR HANDLING-- */
}
