156 lines
3.2 KiB
C
156 lines
3.2 KiB
C
/* -*-comment-start: "//";comment-end:""-*-
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* Mes --- Maxwell Equations of Software
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* Copyright © 2016 Jan Nieuwenhuizen <janneke@gnu.org>
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*
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* This file is part of Mes.
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*
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* 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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* 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 Mes. If not, see <http://www.gnu.org/licenses/>.
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*/
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SCM
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greater_p (SCM x) ///((name . ">") (arity . n))
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{
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int n = INT_MAX;
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while (x != cell_nil)
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{
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assert (TYPE (car (x)) == NUMBER);
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if (VALUE (car (x)) >= n) return cell_f;
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n = VALUE (car (x));
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x = cdr (x);
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}
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return cell_t;
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}
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SCM
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less_p (SCM x) ///((name . "<") (arity . n))
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{
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int n = INT_MIN;
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while (x != cell_nil)
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{
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assert (TYPE (car (x)) == NUMBER);
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if (VALUE (car (x)) <= n) return cell_f;
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n = VALUE (car (x));
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x = cdr (x);
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}
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return cell_t;
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}
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SCM
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is_p (SCM x) ///((name . "=") (arity . n))
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{
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if (x == cell_nil) return cell_t;
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assert (TYPE (car (x)) == NUMBER);
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int n = VALUE (car (x));
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x = cdr (x);
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while (x != cell_nil)
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{
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if (VALUE (car (x)) != n) return cell_f;
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x = cdr (x);
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}
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return cell_t;
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}
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SCM
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minus (SCM x) ///((name . "-") (arity . n))
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{
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SCM a = car (x);
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assert (TYPE (a) == NUMBER);
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int n = VALUE (a);
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x = cdr (x);
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if (x == cell_nil)
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n = -n;
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while (x != cell_nil)
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{
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assert (TYPE (car (x)) == NUMBER);
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n -= VALUE (car (x));
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x = cdr (x);
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}
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return make_number (n);
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}
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SCM
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plus (SCM x) ///((name . "+") (arity . n))
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{
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int n = 0;
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while (x != cell_nil)
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{
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assert (TYPE (car (x)) == NUMBER);
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n += VALUE (car (x));
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x = cdr (x);
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}
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return make_number (n);
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}
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SCM
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divide (SCM x) ///((name . "/") (arity . n))
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{
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int n = 1;
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if (x != cell_nil) {
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assert (TYPE (car (x)) == NUMBER);
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n = VALUE (car (x));
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x = cdr (x);
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}
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while (x != cell_nil)
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{
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assert (TYPE (car (x)) == NUMBER);
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n /= VALUE (car (x));
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x = cdr (x);
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}
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return make_number (n);
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}
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SCM
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modulo (SCM a, SCM b)
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{
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assert (TYPE (a) == NUMBER);
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assert (TYPE (b) == NUMBER);
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return make_number (VALUE (a) % VALUE (b));
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}
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SCM
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multiply (SCM x) ///((name . "*") (arity . n))
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{
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int n = 1;
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while (x != cell_nil)
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{
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assert (TYPE (car (x)) == NUMBER);
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n *= VALUE (car (x));
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x = cdr (x);
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}
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return make_number (n);
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}
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SCM
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logior (SCM x) ///((arity . n))
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{
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int n = 0;
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while (x != cell_nil)
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{
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assert (TYPE (car (x)) == NUMBER);
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n |= VALUE (car (x));
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x = cdr (x);
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}
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return make_number (n);
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}
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SCM
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ash (SCM n, SCM count)
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{
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assert (TYPE (n) == NUMBER);
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assert (TYPE (count) == NUMBER);
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int cn = VALUE (n);
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int ccount = VALUE (count);
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return make_number ((ccount < 0) ? cn >> -ccount : cn << ccount);
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}
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