author | Shabe Razvi <shaber@symbian.org> |
Fri, 13 Nov 2009 15:54:25 +0000 | |
changeset 15 | cc51249fbd9c |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
1
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/* Float object interface */ |
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/* |
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PyFloatObject represents a (double precision) floating point number. |
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*/ |
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#ifndef Py_FLOATOBJECT_H |
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#define Py_FLOATOBJECT_H |
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#ifdef __cplusplus |
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extern "C" { |
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#endif |
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typedef struct { |
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PyObject_HEAD |
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double ob_fval; |
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} PyFloatObject; |
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PyAPI_DATA(PyTypeObject) PyFloat_Type; |
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#define PyFloat_Check(op) PyObject_TypeCheck(op, &PyFloat_Type) |
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#define PyFloat_CheckExact(op) (Py_TYPE(op) == &PyFloat_Type) |
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#ifdef Py_NAN |
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#define Py_RETURN_NAN return PyFloat_FromDouble(Py_NAN) |
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#endif |
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#define Py_RETURN_INF(sign) do \ |
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if (copysign(1., sign) == 1.) { \ |
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return PyFloat_FromDouble(Py_HUGE_VAL); \ |
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} else { \ |
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return PyFloat_FromDouble(-Py_HUGE_VAL); \ |
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} while(0) |
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PyAPI_FUNC(double) PyFloat_GetMax(void); |
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PyAPI_FUNC(double) PyFloat_GetMin(void); |
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PyAPI_FUNC(PyObject *) PyFloat_GetInfo(void); |
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/* Return Python float from string PyObject. Second argument ignored on |
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input, and, if non-NULL, NULL is stored into *junk (this tried to serve a |
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purpose once but can't be made to work as intended). */ |
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PyAPI_FUNC(PyObject *) PyFloat_FromString(PyObject*, char** junk); |
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/* Return Python float from C double. */ |
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PyAPI_FUNC(PyObject *) PyFloat_FromDouble(double); |
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/* Extract C double from Python float. The macro version trades safety for |
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speed. */ |
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PyAPI_FUNC(double) PyFloat_AsDouble(PyObject *); |
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#define PyFloat_AS_DOUBLE(op) (((PyFloatObject *)(op))->ob_fval) |
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/* Write repr(v) into the char buffer argument, followed by null byte. The |
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buffer must be "big enough"; >= 100 is very safe. |
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PyFloat_AsReprString(buf, x) strives to print enough digits so that |
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PyFloat_FromString(buf) then reproduces x exactly. */ |
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PyAPI_FUNC(void) PyFloat_AsReprString(char*, PyFloatObject *v); |
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/* Write str(v) into the char buffer argument, followed by null byte. The |
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buffer must be "big enough"; >= 100 is very safe. Note that it's |
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unusual to be able to get back the float you started with from |
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PyFloat_AsString's result -- use PyFloat_AsReprString() if you want to |
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preserve precision across conversions. */ |
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PyAPI_FUNC(void) PyFloat_AsString(char*, PyFloatObject *v); |
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/* _PyFloat_{Pack,Unpack}{4,8} |
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* |
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* The struct and pickle (at least) modules need an efficient platform- |
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* independent way to store floating-point values as byte strings. |
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* The Pack routines produce a string from a C double, and the Unpack |
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* routines produce a C double from such a string. The suffix (4 or 8) |
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* specifies the number of bytes in the string. |
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* |
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* On platforms that appear to use (see _PyFloat_Init()) IEEE-754 formats |
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* these functions work by copying bits. On other platforms, the formats the |
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* 4- byte format is identical to the IEEE-754 single precision format, and |
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* the 8-byte format to the IEEE-754 double precision format, although the |
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* packing of INFs and NaNs (if such things exist on the platform) isn't |
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* handled correctly, and attempting to unpack a string containing an IEEE |
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* INF or NaN will raise an exception. |
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* |
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* On non-IEEE platforms with more precision, or larger dynamic range, than |
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* 754 supports, not all values can be packed; on non-IEEE platforms with less |
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* precision, or smaller dynamic range, not all values can be unpacked. What |
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* happens in such cases is partly accidental (alas). |
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*/ |
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86 |
|
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/* The pack routines write 4 or 8 bytes, starting at p. le is a bool |
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* argument, true if you want the string in little-endian format (exponent |
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* last, at p+3 or p+7), false if you want big-endian format (exponent |
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* first, at p). |
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* Return value: 0 if all is OK, -1 if error (and an exception is |
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* set, most likely OverflowError). |
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* There are two problems on non-IEEE platforms: |
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* 1): What this does is undefined if x is a NaN or infinity. |
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* 2): -0.0 and +0.0 produce the same string. |
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*/ |
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PyAPI_FUNC(int) _PyFloat_Pack4(double x, unsigned char *p, int le); |
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PyAPI_FUNC(int) _PyFloat_Pack8(double x, unsigned char *p, int le); |
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99 |
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/* Used to get the important decimal digits of a double */ |
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101 |
PyAPI_FUNC(int) _PyFloat_Digits(char *buf, double v, int *signum); |
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PyAPI_FUNC(void) _PyFloat_DigitsInit(void); |
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103 |
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104 |
/* The unpack routines read 4 or 8 bytes, starting at p. le is a bool |
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105 |
* argument, true if the string is in little-endian format (exponent |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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106 |
* last, at p+3 or p+7), false if big-endian (exponent first, at p). |
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107 |
* Return value: The unpacked double. On error, this is -1.0 and |
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108 |
* PyErr_Occurred() is true (and an exception is set, most likely |
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109 |
* OverflowError). Note that on a non-IEEE platform this will refuse |
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110 |
* to unpack a string that represents a NaN or infinity. |
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111 |
*/ |
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112 |
PyAPI_FUNC(double) _PyFloat_Unpack4(const unsigned char *p, int le); |
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113 |
PyAPI_FUNC(double) _PyFloat_Unpack8(const unsigned char *p, int le); |
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114 |
|
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115 |
/* free list api */ |
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116 |
PyAPI_FUNC(int) PyFloat_ClearFreeList(void); |
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117 |
|
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118 |
/* Format the object based on the format_spec, as defined in PEP 3101 |
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119 |
(Advanced String Formatting). */ |
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120 |
PyAPI_FUNC(PyObject *) _PyFloat_FormatAdvanced(PyObject *obj, |
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121 |
char *format_spec, |
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122 |
Py_ssize_t format_spec_len); |
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123 |
|
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124 |
#ifdef __cplusplus |
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125 |
} |
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126 |
#endif |
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127 |
#endif /* !Py_FLOATOBJECT_H */ |