/* -*-comment-start: "//";comment-end:""-*-
 * GNU Mes --- Maxwell Equations of Software
 * Copyright © 2016,2017,2018,2019 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 <ctype.h>

long
abtol (char const **p, int base)
{
  char const *s = *p;
  int i = 0;
  int sign_p = 0;
  if (!base)
    base = 10;
  while (isspace (*s))
    s++;
  if (*s && *s == '+')
    s++;
  if (*s && *s == '-')
    {
      sign_p = 1;
      s++;
    }
  while (isnumber (*s, base))
    {
      i *= base;
      int m = *s > '9' ? 'a' - 10 : '0';
      i += *s - m;
      s++;
    }
  *p = s;
  return sign_p ? -i : i;
}