Mercurial > cpython-lru_cache-weakref

annotate Python/fmod.c @ 7290:72d531d54572 legacy-trunk

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Add case checking feature on import. This is an option for OS-es with case-insensitive but case-preserving filesystems. It is currently supported for Win32 and MacOS. To enable it, #define CHECK_IMPORT_CASE in your platform specific config.h. It is enabled by default on those systems where it is supported. On Win32, it can be disabled at runtime by setting the environment variable PYTHONCASEOK (to any value). When enabled, the feature checks that the case of the requested module name matches that of the filename found in the filesystem, and raises a NameError exception when they don't match.
author Guido van Rossum <guido@python.org>
date Fri, 13 Feb 1998 17:18:36 +0000
parents 65d2d8e67da3
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 }