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/* Generic helper function for repacking arrays.
Copyright 2003 Free Software Foundation, Inc.
Contributed by Paul Brook <paul@nowt.org>
This file is part of the GNU Fortran 95 runtime library (libgfor).
Libgfor is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
Ligbfor is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with libgfor; see the file COPYING.LIB. If not,
write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include "config.h"
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include "libgfortran.h"
void
internal_unpack (gfc_array_char * d, const void * s)
{
index_type count[GFC_MAX_DIMENSIONS - 1];
index_type extent[GFC_MAX_DIMENSIONS - 1];
index_type stride[GFC_MAX_DIMENSIONS - 1];
index_type stride0;
index_type dim;
index_type dsize;
char *dest;
const char *src;
int n;
int size;
dest = d->data;
/* This check may be redundant, but do it anyway. */
if (s == dest || !s)
return;
size = GFC_DESCRIPTOR_SIZE (d);
switch (size)
{
case 4:
internal_unpack_4 ((gfc_array_i4 *)d, (const GFC_INTEGER_4 *)s);
return;
case 8:
internal_unpack_8 ((gfc_array_i8 *)d, (const GFC_INTEGER_8 *)s);
return;
}
if (d->dim[0].stride == 0)
d->dim[0].stride = 1;
dim = GFC_DESCRIPTOR_RANK (d);
dsize = 1;
for (n = 0; n < dim; n++)
{
count[n] = 0;
stride[n] = d->dim[n].stride;
extent[n] = d->dim[n].ubound + 1 - d->dim[n].lbound;
if (extent[n] <= 0)
abort ();
if (dsize == stride[n])
dsize *= extent[n];
else
dsize = 0;
}
src = s;
if (dsize != 0)
{
memcpy (dest, src, dsize * size);
return;
}
stride0 = stride[0] * size;
while (dest)
{
/* Copy the data. */
memcpy (dest, src, size);
/* Advance to the next element. */
src += size;
dest += stride0;
count[0]++;
/* Advance to the next source element. */
n = 0;
while (count[n] == extent[n])
{
/* When we get to the end of a dimension, reset it and increment
the next dimension. */
count[n] = 0;
/* We could precalculate these products, but this is a less
frequently used path so proabably not worth it. */
dest -= stride[n] * extent[n] * size;
n++;
if (n == dim)
{
dest = NULL;
break;
}
else
{
count[n]++;
dest += stride[n] * size;
}
}
}
}
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