mes/lib/abtol.c

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/* -*-comment-start: "//";comment-end:""-*-
* GNU Mes --- Maxwell Equations of Software
* Copyright © 2016,2017,2018 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 <libmes.h>
long
abtol (char const **p, int base)
{
char const *s = *p;
long i = 0;
int sign = 1;
if (!base) base = 10;
if (*s && *s == '-')
{
sign = -1;
s++;
}
while (isnumber (*s, base))
{
i *= base;
long m = *s > '9' ? 'a' - 10 : '0';
i += *s - m;
s++;
}
*p = s;
return i * sign;
}