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annotate Python/fmod.c @ 4503:65d2d8e67da3 legacy-trunk

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New permission notice, includes CNRI.
author Guido van Rossum <guido@python.org>
date Fri, 25 Oct 1996 14:44:06 +0000
parents d6c7e40cbfdf
children 916fb024ce94
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1 /***********************************************************
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2 Copyright 1991-1995 by Stichting Mathematisch Centrum, Amsterdam,
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3 The Netherlands.
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4
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5 All Rights Reserved
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6
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7 Permission to use, copy, modify, and distribute this software and its
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8 documentation for any purpose and without fee is hereby granted,
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9 provided that the above copyright notice appear in all copies and that
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10 both that copyright notice and this permission notice appear in
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11 supporting documentation, and that the names of Stichting Mathematisch
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12 Centrum or CWI or Corporation for National Research Initiatives or
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13 CNRI not be used in advertising or publicity pertaining to
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14 distribution of the software without specific, written prior
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15 permission.
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16
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17 While CWI is the initial source for this software, a modified version
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18 is made available by the Corporation for National Research Initiatives
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19 (CNRI) at the Internet address ftp://ftp.python.org.
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20
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21 STICHTING MATHEMATISCH CENTRUM AND CNRI DISCLAIM ALL WARRANTIES WITH
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22 REGARD TO THIS SOFTWARE, INCLUDING ALL IMPLIED WARRANTIES OF
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23 MERCHANTABILITY AND FITNESS, IN NO EVENT SHALL STICHTING MATHEMATISCH
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24 CENTRUM OR CNRI BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL
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25 DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR
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26 PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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27 TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR
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28 PERFORMANCE OF THIS SOFTWARE.
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30 ******************************************************************/
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31
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32 /* Portable fmod(x, y) implementation for systems that don't have it */
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33
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34 #include "config.h"
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35
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36 #include "mymath.h"
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37 #include <errno.h>
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38
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39 double
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40 fmod(double x, double y)
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41 {
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42 double i, f;
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43
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44 if (y == 0.0) {
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45 errno = EDOM;
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46 return 0.0;
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47 }
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48
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49 /* return f such that x = i*y + f for some integer i
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50 such that |f| < |y| and f has the same sign as x */
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51
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52 i = floor(x/y);
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53 f = x - i*y;
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54 if ((x < 0.0) != (y < 0.0))
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55 f = f-y;
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56 return f;
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57 }