mes-m2/lib/stdlib/strtod.c

/* -*-comment-start: "//";comment-end:""-*-
 * GNU Mes --- Maxwell Equations of Software
 * Copyright © 2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
 *
 * This file is part of GNU Mes.
 *
 * GNU Mes 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.
 *
 * GNU Mes 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 GNU Mes.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <mes/lib.h>
#include <stdlib.h>
#include <string.h>

double
strtod (char const *string, char **tailptr)
{
  int base = 10;
  if (!strncmp (string, "0x", 2))
    {
      string += 2;
      base = 16;
    }
  if (tailptr)
    {
      *tailptr = (char *) string;
      return abtod ((char const **) tailptr, base);
    }
  char **p = (char **) &string;
  return abtod ((char const **) p, base);
}