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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/*
*
* Copyright (C) 1997 University of Chicago.
* See COPYRIGHT notice in top-level directory.
*/
#include "adio.h"
#include "adio_extern.h"
#include "adioi.h"
/* returns the current position of the individual file pointer
in etype units relative to the current view. */
void ADIOI_Get_position(ADIO_File fd, ADIO_Offset *offset)
{
ADIOI_Flatlist_node *flat_file;
int i, flag;
MPI_Count filetype_size, etype_size;
int filetype_is_contig;
MPI_Aint filetype_extent, lb;
ADIO_Offset disp, byte_offset, sum=0, size_in_file, n_filetypes, frd_size;
ADIOI_Datatype_iscontig(fd->filetype, &filetype_is_contig);
etype_size = fd->etype_size;
if (filetype_is_contig) *offset = (fd->fp_ind - fd->disp)/etype_size;
else {
/* filetype already flattened in ADIO_Open */
flat_file = ADIOI_Flatlist;
while (flat_file->type != fd->filetype) flat_file = flat_file->next;
MPI_Type_size_x(fd->filetype, &filetype_size);
MPI_Type_get_extent(fd->filetype, &lb, &filetype_extent);
disp = fd->disp;
byte_offset = fd->fp_ind;
n_filetypes = -1;
flag = 0;
while (!flag) {
sum = 0;
n_filetypes++;
for (i=0; i<flat_file->count; i++) {
sum += flat_file->blocklens[i];
if (disp + flat_file->indices[i] +
n_filetypes* ADIOI_AINT_CAST_TO_OFFSET filetype_extent + flat_file->blocklens[i]
>= byte_offset) {
frd_size = disp + flat_file->indices[i] +
n_filetypes * ADIOI_AINT_CAST_TO_OFFSET filetype_extent
+ flat_file->blocklens[i] - byte_offset;
sum -= frd_size;
flag = 1;
break;
}
}
}
size_in_file = n_filetypes * (ADIO_Offset)filetype_size + sum;
*offset = size_in_file/etype_size;
}
}
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