/* -*- Mode: C; c-basic-offset:4 ; -*- */
/* 
 *   $Id: set_view.c,v 1.3 2003/03/25 22:41:04 nsanghvi Exp $    
 *
 *   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 */
#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, char *datarep, MPI_Info info)
{
    ADIO_Fcntl_t *fcntl_struct;
    int filetype_size, etype_size, error_code;
#ifndef PRINT_ERR_MSG
    static char myname[] = "MPI_FILE_SET_VIEW";
#endif
    ADIO_Offset shared_fp, byte_off;

#ifdef PRINT_ERR_MSG
    if ((fh <= (MPI_File) 0) || (fh->cookie != ADIOI_FILE_COOKIE)) {
	FPRINTF(stderr, "MPI_File_set_view: Invalid file handle\n");
	MPI_Abort(MPI_COMM_WORLD, 1);
    }
#else
    ADIOI_TEST_FILE_HANDLE(fh, myname);
#endif

    if ((disp < 0) && (disp != MPI_DISPLACEMENT_CURRENT)) {
#ifdef PRINT_ERR_MSG
	FPRINTF(stderr, "MPI_File_set_view: Invalid disp argument\n");
	MPI_Abort(MPI_COMM_WORLD, 1);
#else
	error_code = MPIR_Err_setmsg(MPI_ERR_ARG, MPIR_ERR_DISP_ARG,
				     myname, (char *) 0, (char *) 0);
	return ADIOI_Error(fh, error_code, myname);	    
#endif
    }

    /* rudimentary checks for incorrect etype/filetype.*/
    if (etype == MPI_DATATYPE_NULL) {
#ifdef PRINT_ERR_MSG
	FPRINTF(stderr, "MPI_File_set_view: Invalid etype\n");
	MPI_Abort(MPI_COMM_WORLD, 1);
#else
	error_code = MPIR_Err_setmsg(MPI_ERR_ARG, MPIR_ERR_ETYPE_ARG,
				     myname, (char *) 0, (char *) 0);
	return ADIOI_Error(fh, error_code, myname);	    
#endif
    }

    if (filetype == MPI_DATATYPE_NULL) {
#ifdef PRINT_ERR_MSG
	FPRINTF(stderr, "MPI_File_set_view: Invalid filetype\n");
	MPI_Abort(MPI_COMM_WORLD, 1);
#else
	error_code = MPIR_Err_setmsg(MPI_ERR_ARG, MPIR_ERR_FILETYPE_ARG,
				     myname, (char *) 0, (char *) 0);
	return ADIOI_Error(fh, error_code, myname);	    
#endif
    }

    if ((fh->access_mode & MPI_MODE_SEQUENTIAL) && (disp != MPI_DISPLACEMENT_CURRENT)) {
#ifdef PRINT_ERR_MSG
        FPRINTF(stderr, "MPI_File_set_view: disp must be set to MPI_DISPLACEMENT_CURRENT since file was opened with MPI_MODE_SEQUENTIAL\n");
        MPI_Abort(MPI_COMM_WORLD, 1);
#else
	error_code = MPIR_Err_setmsg(MPI_ERR_ARG, 1,
				     myname, (char *) 0, "%s", "displacement must be set to MPI_DISPLACEMENT_CURRENT since file was opened with MPI_MODE_SEQUENTIAL");
	return ADIOI_Error(fh, error_code, myname);	    
#endif
    }

    if ((disp == MPI_DISPLACEMENT_CURRENT) && !(fh->access_mode & MPI_MODE_SEQUENTIAL)) {
#ifdef PRINT_ERR_MSG
        FPRINTF(stderr, "MPI_File_set_view: disp can be set to MPI_DISPLACEMENT_CURRENT only if file was opened with MPI_MODE_SEQUENTIAL\n");
        MPI_Abort(MPI_COMM_WORLD, 1);
#else
	error_code = MPIR_Err_setmsg(MPI_ERR_ARG, 1,
				     myname, (char *) 0, "%s", "displacement can be set to MPI_DISPLACEMENT_CURRENT only if file was opened with MPI_MODE_SEQUENTIAL");
	return ADIOI_Error(fh, error_code, myname);	    
#endif
    }

    MPI_Type_size(filetype, &filetype_size);
    MPI_Type_size(etype, &etype_size);
    if (filetype_size % etype_size != 0) {
#ifdef PRINT_ERR_MSG
	FPRINTF(stderr, "MPI_File_set_view: Filetype must be constructed out of one or more etypes\n");
	MPI_Abort(MPI_COMM_WORLD, 1);
#else
	error_code = MPIR_Err_setmsg(MPI_ERR_IO, MPIR_ERR_FILETYPE,
				     myname, (char *) 0, (char *) 0);
	return ADIOI_Error(fh, error_code, myname);	    
#endif
    }

    if (strcmp(datarep, "native") && strcmp(datarep, "NATIVE")) {
#ifdef PRINT_ERR_MSG
	FPRINTF(stderr, "MPI_File_set_view: Only \"native\" data representation currently supported\n");
	MPI_Abort(MPI_COMM_WORLD, 1);
#else
	error_code = MPIR_Err_setmsg(MPI_ERR_UNSUPPORTED_DATAREP, 
               MPIR_ERR_NOT_NATIVE_DATAREP, myname, (char *) 0, (char *) 0);
	return ADIOI_Error(fh, error_code, myname);	    
#endif
    }

    fcntl_struct = (ADIO_Fcntl_t *) ADIOI_Malloc(sizeof(ADIO_Fcntl_t));
    fcntl_struct->disp = disp;
    fcntl_struct->etype = etype;
    fcntl_struct->filetype = filetype;
    fcntl_struct->info = info;
    fcntl_struct->iomode = fh->iomode;

    if (disp == MPI_DISPLACEMENT_CURRENT) {
	MPI_Barrier(fh->comm);
	ADIO_Get_shared_fp(fh, 0, &shared_fp, &error_code);
	/* MPI_Barrier(fh->comm); 
           deleting this because there is a barrier below */
	ADIOI_Get_byte_offset(fh, shared_fp, &byte_off);
	fcntl_struct->disp = byte_off;
    }

    ADIO_Fcntl(fh, ADIO_FCNTL_SET_VIEW, fcntl_struct, &error_code);

    /* reset shared file pointer to zero */

    if ((fh->file_system != ADIO_PIOFS) && (fh->file_system != ADIO_PVFS) && 
        (fh->shared_fp_fd != ADIO_FILE_NULL)) 
	ADIO_Set_shared_fp(fh, 0, &error_code);
    /* 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. */

    if ((fh->file_system != ADIO_PIOFS) && (fh->file_system != ADIO_PVFS))
	MPI_Barrier(fh->comm); /* for above to work correctly */

    ADIOI_Free(fcntl_struct);
    return error_code;
}