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/* Generic implementation of the RESHAPE intrinsic
Copyright 2002 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
__pack (const gfc_array_char * ret, const gfc_array_char * array,
const gfc_array_l4 * mask, const gfc_array_char * vector)
{
/* r.* indicates the return array. */
index_type rstride0;
char *rptr;
/* s.* indicates the source array. */
index_type sstride[GFC_MAX_DIMENSIONS];
index_type sstride0;
const char *sptr;
/* m.* indicates the mask array. */
index_type mstride[GFC_MAX_DIMENSIONS];
index_type mstride0;
const GFC_LOGICAL_4 *mptr;
index_type count[GFC_MAX_DIMENSIONS];
index_type extent[GFC_MAX_DIMENSIONS];
index_type n;
index_type dim;
index_type size;
index_type nelem;
size = GFC_DESCRIPTOR_SIZE (array);
dim = GFC_DESCRIPTOR_RANK (array);
for (n = 0; n < dim; n++)
{
count[n] = 0;
extent[n] = array->dim[n].ubound + 1 - array->dim[n].lbound;
sstride[n] = array->dim[n].stride * size;
mstride[n] = mask->dim[n].stride;
}
if (sstride[0] == 0)
sstride[0] = size;
if (mstride[0] == 0)
mstride[0] = 1;
rstride0 = ret->dim[0].stride * size;
if (rstride0 == 0)
rstride0 = size;
sstride0 = sstride[0];
mstride0 = mstride[0];
rptr = ret->data;
sptr = array->data;
mptr = mask->data;
/* Use the same loop for both logical types. */
if (GFC_DESCRIPTOR_SIZE (mask) != 4)
{
if (GFC_DESCRIPTOR_SIZE (mask) != 8)
runtime_error ("Funny sized logical array");
for (n = 0; n < dim; n++)
mstride[n] <<= 1;
mstride0 <<= 1;
mptr = GFOR_POINTER_L8_TO_L4 (mptr);
}
while (sptr)
{
/* Test this element. */
if (*mptr)
{
/* Add it. */
memcpy (rptr, sptr, size);
rptr += rstride0;
}
/* Advance to the next element. */
sptr += sstride0;
mptr += mstride0;
count[0]++;
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. */
sptr -= sstride[n] * extent[n];
mptr -= mstride[n] * extent[n];
n++;
if (n >= dim)
{
/* Break out of the loop. */
sptr = NULL;
break;
}
else
{
count[n]++;
sptr += sstride[n];
mptr += mstride[n];
}
}
}
/* Add any remaining elements from VECTOR. */
if (vector)
{
n = vector->dim[0].ubound + 1 - vector->dim[0].lbound;
nelem = ((rptr - ret->data) / rstride0);
if (n > nelem)
{
sstride0 = vector->dim[0].stride * size;
if (sstride0 == 0)
sstride0 = size;
sptr = vector->data + sstride0 * nelem;
n -= nelem;
while (n--)
{
memcpy (rptr, sptr, size);
rptr += rstride0;
sptr += sstride0;
}
}
}
}
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