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`/* Implementation of the CSHIFT intrinsic

   Copyright 2003 Free Software Foundation, Inc.

   Contributed by Feng Wang <wf_cs@yahoo.com>

This file is part of the GNU Fortran 95 runtime library (libgfortran).

Libgfortran is free software; you can redistribute it and/or

modify it under the terms of the GNU General Public

License as published by the Free Software Foundation; either

version 2 of the License, or (at your option) any later version.

In addition to the permissions in the GNU General Public License, the

Free Software Foundation gives you unlimited permission to link the

compiled version of this file into combinations with other programs,

and to distribute those combinations without any restriction coming

from the use of this file.  (The General Public License restrictions

do apply in other respects; for example, they cover modification of

the file, and distribution when not linked into a combine

executable.)

Ligbfortran 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 General Public License for more details.

You should have received a copy of the GNU General Public

License along with libgfortran; see the file COPYING.  If not,

write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,

Boston, MA 02110-1301, USA.  */

#include "config.h"

#include <stdlib.h>

#include <assert.h>

#include <string.h>

#include "libgfortran.h"'

include(iparm.m4)dnl

`#if defined (HAVE_'atype_name`)'

static void

cshift1 (gfc_array_char * ret, const gfc_array_char * array,

         const atype * h, const atype_name * pwhich, index_type size)

{

  /* r.* indicates the return array.  */

  index_type rstride[GFC_MAX_DIMENSIONS];

  index_type rstride0;

  index_type roffset;

  char *rptr;

  char *dest;

  /* s.* indicates the source array.  */

  index_type sstride[GFC_MAX_DIMENSIONS];

  index_type sstride0;

  index_type soffset;

  const char *sptr;

  const char *src;

  /* h.* indicates the shift array.  */

  index_type hstride[GFC_MAX_DIMENSIONS];

  index_type hstride0;

  const atype_name *hptr;

  index_type count[GFC_MAX_DIMENSIONS];

  index_type extent[GFC_MAX_DIMENSIONS];

  index_type dim;

  index_type len;

  index_type n;

  int which;

  atype_name sh;

  if (pwhich)

    which = *pwhich - 1;

  else

    which = 0;

  if (which < 0 || (which + 1) > GFC_DESCRIPTOR_RANK (array))

    runtime_error ("Argument 'DIM' is out of range in call to 'CSHIFT'");

  if (ret->data == NULL)

    {

      int i;

      ret->data = internal_malloc_size (size * size0 ((array_t *)array));

      ret->offset = 0;

      ret->dtype = array->dtype;

      for (i = 0; i < GFC_DESCRIPTOR_RANK (array); i++)

        {

          ret->dim[i].lbound = 0;

          ret->dim[i].ubound = array->dim[i].ubound - array->dim[i].lbound;

          if (i == 0)

            ret->dim[i].stride = 1;

          else

            ret->dim[i].stride = (ret->dim[i-1].ubound + 1) * ret->dim[i-1].stride;

        }

    }

  extent[0] = 1;

  count[0] = 0;

  n = 0;

  /* Initialized for avoiding compiler warnings.  */

  roffset = size;

  soffset = size;

  len = 0;

  for (dim = 0; dim < GFC_DESCRIPTOR_RANK (array); dim++)

    {

      if (dim == which)

        {

          roffset = ret->dim[dim].stride * size;

          if (roffset == 0)

            roffset = size;

          soffset = array->dim[dim].stride * size;

          if (soffset == 0)

            soffset = size;

          len = array->dim[dim].ubound + 1 - array->dim[dim].lbound;

        }

      else

        {

          count[n] = 0;

          extent[n] = array->dim[dim].ubound + 1 - array->dim[dim].lbound;

          rstride[n] = ret->dim[dim].stride * size;

          sstride[n] = array->dim[dim].stride * size;

          hstride[n] = h->dim[n].stride;

          n++;

        }

    }

  if (sstride[0] == 0)

    sstride[0] = size;

  if (rstride[0] == 0)

    rstride[0] = size;

  if (hstride[0] == 0)

    hstride[0] = 1;

  dim = GFC_DESCRIPTOR_RANK (array);

  rstride0 = rstride[0];

  sstride0 = sstride[0];

  hstride0 = hstride[0];

  rptr = ret->data;

  sptr = array->data;

  hptr = h->data;

  while (rptr)

    {

      /* Do the shift for this dimension.  */

      sh = *hptr;

      sh = (div (sh, len)).rem;

      if (sh < 0)

        sh += len;

      src = &sptr[sh * soffset];

      dest = rptr;

      for (n = 0; n < len; n++)

        {

          memcpy (dest, src, size);

          dest += roffset;

          if (n == len - sh - 1)

            src = sptr;

          else

            src += soffset;

        }

      /* Advance to the next section.  */

      rptr += rstride0;

      sptr += sstride0;

      hptr += hstride0;

      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.  */

          rptr -= rstride[n] * extent[n];

          sptr -= sstride[n] * extent[n];

          hptr -= hstride[n] * extent[n];

          n++;

          if (n >= dim - 1)

            {

              /* Break out of the loop.  */

              rptr = NULL;

              break;

            }

          else

            {

              count[n]++;

              rptr += rstride[n];

              sptr += sstride[n];

              hptr += hstride[n];

            }

        }

    }

}

void cshift1_`'atype_kind (gfc_array_char *, const gfc_array_char *,

                           const atype *, const atype_name *);

export_proto(cshift1_`'atype_kind);

void

cshift1_`'atype_kind (gfc_array_char * ret,

                      const gfc_array_char * array,

                      const atype * h, const atype_name * pwhich)

{

  cshift1 (ret, array, h, pwhich, GFC_DESCRIPTOR_SIZE (array));

}

void cshift1_`'atype_kind`'_char (gfc_array_char * ret, GFC_INTEGER_4,

                                  const gfc_array_char * array,

                                  const atype * h, const atype_name * pwhich,

                                  GFC_INTEGER_4);

export_proto(cshift1_`'atype_kind`'_char);

void

cshift1_`'atype_kind`'_char (gfc_array_char * ret,

                             GFC_INTEGER_4 ret_length __attribute__((unused)),

                             const gfc_array_char * array,

                             const atype * h, const atype_name * pwhich,

                             GFC_INTEGER_4 array_length)

{

  cshift1 (ret, array, h, pwhich, array_length);

}

#endif