/* specfunc/result.c

 * 

 * Copyright (C) 1996, 1997, 1998, 1999, 2000 Gerard Jungman

 * 

 * 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.

 */

/* Author:  G. Jungman */

#include <config.h>

#include <gsl/gsl_math.h>

#include <gsl/gsl_errno.h>

#include <gsl/gsl_sf_exp.h>

#include <gsl/gsl_sf_result.h>

int

gsl_sf_result_smash_e(const gsl_sf_result_e10 * re, gsl_sf_result * r)

{

  if(re->e10 == 0) {

    /* nothing to smash */

    r->val = re->val;

    r->err = re->err;

    return GSL_SUCCESS;

  }

  else {

    const double av = fabs(re->val);

    const double ae = fabs(re->err);

    if(   GSL_SQRT_DBL_MIN < av && av < GSL_SQRT_DBL_MAX

       && GSL_SQRT_DBL_MIN < ae && ae < GSL_SQRT_DBL_MAX

       && 0.49*GSL_LOG_DBL_MIN  < re->e10 && re->e10 < 0.49*GSL_LOG_DBL_MAX

       ) {

      const double scale = exp(re->e10 * M_LN10);

      r->val = re->val * scale;

      r->err = re->err * scale;

      return GSL_SUCCESS;

    }

    else {

      return gsl_sf_exp_mult_err_e(re->e10*M_LN10, 0.0, re->val, re->err, r);

    }

  }

/*

  int stat_v;

  int stat_e;

  if(re->val == 0.0) {

    r->val = 0.0;

    stat_v = GSL_SUCCESS;

  }

  else {

    gsl_sf_result r_val;

    const double s = GSL_SIGN(re->val);

    const double x_v = re->e10*M_LN10 + log(fabs(re->val));

    stat_v = gsl_sf_exp_e(x_v, &r_val);

    r->val = s * r_val.val;

  }

  if(re->err == 0.0) {

    r->err = 0.0;

    stat_e = GSL_SUCCESS;

  }

  else if(re->val != 0.0) {

    r->err = fabs(r->val * re->err/re->val);

    stat_e = GSL_SUCCESS;

  }

  else {

    gsl_sf_result r_err;

    const double x_e = re->e10*M_LN10 + log(fabs(re->err));

    stat_e = gsl_sf_exp_e(x_e, &r_err);

    r->err = r_err.val;

  }

  return GSL_ERROR_SELECT_2(stat_v, stat_e);

*/

}