54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* GNU Mes --- Maxwell Equations of Software
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* Copyright © 2016,2017,2018,2019 Jan (janneke) Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of GNU Mes.
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*
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* GNU Mes is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or (at
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* your option) any later version.
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*
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* GNU Mes is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GNU Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <mes/lib.h>
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double
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abtod (char const **p, int base)
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{
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char const *s = *p;
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double d = 0;
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int sign_p = 0;
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if (!base)
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base = 10;
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double dbase = base;
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long i = abtol (&s, base);
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long f = 0;
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long e = 0;
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if (*s == '.')
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{
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s++;
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f = abtol (&s, base);
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}
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if (*s == 'e')
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{
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s++;
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e = abtol (&s, base);
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}
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d = i + f / dbase;
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if (e < 0)
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while (e++)
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d = d / dbase;
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while (e--)
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d = d * dbase;
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*p = s;
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return sign_p ? -d : d;
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}
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