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/* Implementation of the TRANSPOSE intrinsic

   Copyright 2003, 2006, 2007, 2009 Free Software Foundation, Inc.

   Contributed by Tobias Schlüter

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

Libgfortran 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.

Under Section 7 of GPL version 3, you are granted additional

permissions described in the GCC Runtime Library Exception, version

3.1, as published by the Free Software Foundation.

You should have received a copy of the GNU General Public License and

a copy of the GCC Runtime Library Exception along with this program;

see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see

<http://www.gnu.org/licenses/>.  */

#include "libgfortran.h"

#include <stdlib.h>

#include <string.h>

#include <assert.h>

extern void transpose (gfc_array_char *, gfc_array_char *);

export_proto(transpose);

static void

transpose_internal (gfc_array_char *ret, gfc_array_char *source)

{

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

  index_type rxstride, rystride;

  char *rptr;

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

  index_type sxstride, systride;

  const char *sptr;

  index_type xcount, ycount;

  index_type x, y;

  index_type size;

  assert (GFC_DESCRIPTOR_RANK (source) == 2

          && GFC_DESCRIPTOR_RANK (ret) == 2);

  size = GFC_DESCRIPTOR_SIZE(ret);

  if (ret->data == NULL)

    {

      assert (ret->dtype == source->dtype);

      GFC_DIMENSION_SET(ret->dim[0], 0, GFC_DESCRIPTOR_EXTENT(source,1) - 1,

                        1);

      GFC_DIMENSION_SET(ret->dim[1], 0, GFC_DESCRIPTOR_EXTENT(source,0) - 1,

                        GFC_DESCRIPTOR_EXTENT(source, 1));

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

      ret->offset = 0;

    }

  else if (unlikely (compile_options.bounds_check))

    {

      index_type ret_extent, src_extent;

      ret_extent = GFC_DESCRIPTOR_EXTENT(ret,0);

      src_extent = GFC_DESCRIPTOR_EXTENT(source,1);

      if (src_extent != ret_extent)

        runtime_error ("Incorrect extent in return value of TRANSPOSE"

                       " intrinsic in dimension 1: is %ld,"

                       " should be %ld", (long int) src_extent,

                       (long int) ret_extent);

      ret_extent = GFC_DESCRIPTOR_EXTENT(ret,1);

      src_extent = GFC_DESCRIPTOR_EXTENT(source,0);

      if (src_extent != ret_extent)

        runtime_error ("Incorrect extent in return value of TRANSPOSE"

                       " intrinsic in dimension 2: is %ld,"

                       " should be %ld", (long int) src_extent,

                       (long int) ret_extent);

    }

  sxstride = GFC_DESCRIPTOR_STRIDE_BYTES(source,0);

  systride = GFC_DESCRIPTOR_STRIDE_BYTES(source,1);

  xcount = GFC_DESCRIPTOR_EXTENT(source,0);

  ycount = GFC_DESCRIPTOR_EXTENT(source,1);

  rxstride = GFC_DESCRIPTOR_STRIDE_BYTES(ret,0);

  rystride = GFC_DESCRIPTOR_STRIDE_BYTES(ret,1);

  rptr = ret->data;

  sptr = source->data;

  for (y = 0; y < ycount; y++)

    {

      for (x = 0; x < xcount; x++)

        {

          memcpy (rptr, sptr, size);

          sptr += sxstride;

          rptr += rystride;

        }

      sptr += systride - (sxstride * xcount);

      rptr += rxstride - (rystride * xcount);

    }

}

extern void transpose (gfc_array_char *, gfc_array_char *);

export_proto(transpose);

void

transpose (gfc_array_char *ret, gfc_array_char *source)

{

  transpose_internal (ret, source);

}

extern void transpose_char (gfc_array_char *, GFC_INTEGER_4,

                            gfc_array_char *, GFC_INTEGER_4);

export_proto(transpose_char);

void

transpose_char (gfc_array_char *ret,

                GFC_INTEGER_4 ret_length __attribute__((unused)),

                gfc_array_char *source,

                GFC_INTEGER_4 source_length __attribute__((unused)))

{

  transpose_internal (ret, source);

}

extern void transpose_char4 (gfc_array_char *, GFC_INTEGER_4,

                             gfc_array_char *, GFC_INTEGER_4);

export_proto(transpose_char4);

void

transpose_char4 (gfc_array_char *ret,

                 GFC_INTEGER_4 ret_length __attribute__((unused)),

                 gfc_array_char *source,

                 GFC_INTEGER_4 source_length __attribute__((unused)))

{

  transpose_internal (ret, source);

}