Mercurial > cpython-lru_cache-weakref

annotate Python/pymath.c @ 58973:db86bf39ccaa legacy-trunk

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Issue 7970: When email.Parser.Parser parses a MIME message of type message/rfc822 it turns it into an object whose body consists of a list containing a single Message object. HeaderParser, on the other hand, just copies the body as a string. Generator.flatten has a special handler for the message mime type that expected the body to be the one item list. This fails if the message was parsed by HeaderParser. So we now check to see if the body is a string first, and if so just we just emit it.
author R. David Murray <rdmurray@bitdance.com>
date Sun, 21 Feb 2010 04:23:00 +0000
parents 7f5cbc28f433
children fd25030223b0
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1 #include "Python.h"
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2
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3 #ifdef X87_DOUBLE_ROUNDING
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4 /* On x86 platforms using an x87 FPU, this function is called from the
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5 Py_FORCE_DOUBLE macro (defined in pymath.h) to force a floating-point
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6 number out of an 80-bit x87 FPU register and into a 64-bit memory location,
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7 thus rounding from extended precision to double precision. */
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8 double _Py_force_double(double x)
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9 {
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10 volatile double y;
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11 y = x;
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12 return y;
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13 }
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14 #endif
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15
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16 #ifdef HAVE_GCC_ASM_FOR_X87
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17
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18 /* inline assembly for getting and setting the 387 FPU control word on
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19 gcc/x86 */
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20
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21 unsigned short _Py_get_387controlword(void) {
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22 unsigned short cw;
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23 __asm__ __volatile__ ("fnstcw %0" : "=m" (cw));
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24 return cw;
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25 }
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26
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27 void _Py_set_387controlword(unsigned short cw) {
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28 __asm__ __volatile__ ("fldcw %0" : : "m" (cw));
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29 }
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30
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31 #endif
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32
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34 #ifndef HAVE_HYPOT
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35 double hypot(double x, double y)
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36 {
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37 double yx;
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38
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39 x = fabs(x);
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40 y = fabs(y);
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41 if (x < y) {
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42 double temp = x;
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43 x = y;
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44 y = temp;
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45 }
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46 if (x == 0.)
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47 return 0.;
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48 else {
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49 yx = y/x;
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50 return x*sqrt(1.+yx*yx);
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51 }
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52 }
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53 #endif /* HAVE_HYPOT */
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54
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55 #ifndef HAVE_COPYSIGN
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56 double
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57 copysign(double x, double y)
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58 {
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59 /* use atan2 to distinguish -0. from 0. */
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60 if (y > 0. || (y == 0. && atan2(y, -1.) > 0.)) {
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61 return fabs(x);
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62 } else {
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63 return -fabs(x);
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64 }
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65 }
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66 #endif /* HAVE_COPYSIGN */
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67
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68 #ifndef HAVE_ROUND
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69 double
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70 round(double x)
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71 {
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72 double absx, y;
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73 absx = fabs(x);
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74 y = floor(absx);
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75 if (absx - y >= 0.5)
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76 y += 1.0;
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77 return copysign(y, x);
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78 }
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79 #endif /* HAVE_ROUND */