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1 /* -*- mode: C; coding: utf-8; tab-width: 4; indent-tabs-mode: t; c-basic-offset: 4 -*-
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2 *
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3 * cfunge - A standard-conforming Befunge93/98/109 interpreter in C.
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4 * Copyright (C) 2008-2009 Arvid Norlander <anmaster AT tele2 DOT se>
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5 *
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6 * This program is free software: you can redistribute it and/or modify
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7 * it under the terms of the GNU General Public License as published by
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8 * the Free Software Foundation, either version 3 of the License, or
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9 * (at the proxy's option) any later version. Arvid Norlander is a
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10 * proxy who can decide which future versions of the GNU General Public
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11 * License can be used.
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12 *
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13 * This program is distributed in the hope that it will be useful,
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14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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16 * GNU General Public License for more details.
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17 *
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18 * You should have received a copy of the GNU General Public License
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19 * along with this program. If not, see <http://www.gnu.org/licenses/>.
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20 */
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21 #include "global.h"
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22 #include "vector.h"
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23 #include <stdint.h>
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24
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25 // NOTE: This has been duplicated in funge-space.c for speed reasons.
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26
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27 FUNGE_ATTR_PURE FUNGE_ATTR_FAST
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28 inline bool vector_is_cardinal(const funge_vector * restrict v)
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29 {
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30 // Due to unsigned this can't overflow in the addition below.
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31 funge_unsigned_cell x = (funge_unsigned_cell)ABS(v->x);
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32 funge_unsigned_cell y = (funge_unsigned_cell)ABS(v->y);
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33 if ((x + y) != 1)
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34 return false;
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35 if (x && y)
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36 return false;
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37 return true;
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38 }
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