#include "config.h"
#include <stdlib.h>
#include <assert.h>
#include <string.h>
#include "libgfortran.h"
static void
__cshift0 (const gfc_array_char * ret, const gfc_array_char * array,
int shift, int which)
{
index_type rstride[GFC_MAX_DIMENSIONS - 1];
index_type rstride0;
index_type roffset;
char *rptr;
char *dest;
index_type sstride[GFC_MAX_DIMENSIONS - 1];
index_type sstride0;
index_type soffset;
const char *sptr;
const char *src;
index_type count[GFC_MAX_DIMENSIONS - 1];
index_type extent[GFC_MAX_DIMENSIONS - 1];
index_type dim;
index_type size;
index_type len;
index_type n;
if (which < 1 || which > GFC_DESCRIPTOR_RANK (array))
runtime_error ("Argument 'DIM' is out of range in call to 'CSHIFT'");
size = GFC_DESCRIPTOR_SIZE (ret);
which = which - 1;
extent[0] = 1;
count[0] = 0;
size = GFC_DESCRIPTOR_SIZE (array);
n = 0;
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;
n++;
}
}
if (sstride[0] == 0)
sstride[0] = size;
if (rstride[0] == 0)
rstride[0] = size;
dim = GFC_DESCRIPTOR_RANK (array);
rstride0 = rstride[0];
sstride0 = sstride[0];
rptr = ret->data;
sptr = array->data;
shift = (div (shift, len)).rem;
if (shift < 0)
shift += len;
while (rptr)
{
src = &sptr[shift * soffset];
dest = rptr;
for (n = 0; n < len; n++)
{
memcpy (dest, src, size);
dest += roffset;
if (n == len - shift - 1)
src = sptr;
else
src += soffset;
}
rptr += rstride0;
sptr += sstride0;
count[0]++;
n = 0;
while (count[n] == extent[n])
{
count[n] = 0;
rptr -= rstride[n] * extent[n];
sptr -= sstride[n] * extent[n];
n++;
if (n >= dim - 1)
{
rptr = NULL;
break;
}
else
{
count[n]++;
rptr += rstride[n];
sptr += sstride[n];
}
}
}
}
void
__cshift0_4 (const gfc_array_char * ret, const gfc_array_char * array,
const GFC_INTEGER_4 * pshift, const GFC_INTEGER_4 * pdim)
{
__cshift0 (ret, array, *pshift, pdim ? *pdim : 1);
}
void
__cshift0_8 (const gfc_array_char * ret, const gfc_array_char * array,
const GFC_INTEGER_8 * pshift, const GFC_INTEGER_8 * pdim)
{
__cshift0 (ret, array, *pshift, pdim ? *pdim : 1);
}