/* integration/workspace.c
 * 
 * Copyright (C) 1996, 1997, 1998, 1999, 2000, 2007, 2009 Brian Gough
 * 
 * This program 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.
 * 
 * This program 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 this program; 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 <gsl/gsl_integration.h>
#include <gsl/gsl_errno.h>

gsl_integration_workspace *
gsl_integration_workspace_alloc (const size_t n) 
{
  gsl_integration_workspace * w ;
  
  if (n == 0)
    {
      GSL_ERROR_VAL ("workspace length n must be positive integer",
                        GSL_EDOM, 0);
    }

  w = (gsl_integration_workspace *) 
    malloc (sizeof (gsl_integration_workspace));

  if (w == 0)
    {
      GSL_ERROR_VAL ("failed to allocate space for workspace struct",
                        GSL_ENOMEM, 0);
    }

  w->alist = (double *) malloc (n * sizeof (double));

  if (w->alist == 0)
    {
      free (w);         /* exception in constructor, avoid memory leak */

      GSL_ERROR_VAL ("failed to allocate space for alist ranges",
                        GSL_ENOMEM, 0);
    }

  w->blist = (double *) malloc (n * sizeof (double));

  if (w->blist == 0)
    {
      free (w->alist);
      free (w);         /* exception in constructor, avoid memory leak */

      GSL_ERROR_VAL ("failed to allocate space for blist ranges",
                        GSL_ENOMEM, 0);
    }

  w->rlist = (double *) malloc (n * sizeof (double));

  if (w->rlist == 0)
    {
      free (w->blist);
      free (w->alist);
      free (w);         /* exception in constructor, avoid memory leak */

      GSL_ERROR_VAL ("failed to allocate space for rlist ranges",
                        GSL_ENOMEM, 0);
    }


  w->elist = (double *) malloc (n * sizeof (double));

  if (w->elist == 0)
    {
      free (w->rlist);
      free (w->blist);
      free (w->alist);
      free (w);         /* exception in constructor, avoid memory leak */

      GSL_ERROR_VAL ("failed to allocate space for elist ranges",
                        GSL_ENOMEM, 0);
    }

  w->order = (size_t *) malloc (n * sizeof (size_t));

  if (w->order == 0)
    {
      free (w->elist);
      free (w->rlist);
      free (w->blist);
      free (w->alist);
      free (w);         /* exception in constructor, avoid memory leak */

      GSL_ERROR_VAL ("failed to allocate space for order ranges",
                        GSL_ENOMEM, 0);
    }

  w->level = (size_t *) malloc (n * sizeof (size_t));

  if (w->level == 0)
    {
      free (w->order);
      free (w->elist);
      free (w->rlist);
      free (w->blist);
      free (w->alist);
      free (w);         /* exception in constructor, avoid memory leak */

      GSL_ERROR_VAL ("failed to allocate space for order ranges",
                        GSL_ENOMEM, 0);
    }

  w->size = 0 ;
  w->limit = n ;
  w->maximum_level = 0 ;
  
  return w ;
}

void
gsl_integration_workspace_free (gsl_integration_workspace * w)
{
  RETURN_IF_NULL (w);
  free (w->level) ;
  free (w->order) ;
  free (w->elist) ;
  free (w->rlist) ;
  free (w->blist) ;
  free (w->alist) ;
  free (w) ;
}

/*
size_t 
gsl_integration_workspace_limit (gsl_integration_workspace * w) 
{
  return w->limit ;
}


size_t 
gsl_integration_workspace_size (gsl_integration_workspace * w) 
{
  return w->size ;
}
*/