| |
| /* Float object interface */ |
| |
| /* |
| PyFloatObject represents a (double precision) floating point number. |
| */ |
| |
| #ifndef Py_FLOATOBJECT_H |
| #define Py_FLOATOBJECT_H |
| #ifdef __cplusplus |
| extern "C" { |
| #endif |
| |
| typedef struct { |
| PyObject_HEAD |
| double ob_fval; |
| } PyFloatObject; |
| |
| PyAPI_DATA(PyTypeObject) PyFloat_Type; |
| |
| #define PyFloat_Check(op) PyObject_TypeCheck(op, &PyFloat_Type) |
| #define PyFloat_CheckExact(op) (Py_TYPE(op) == &PyFloat_Type) |
| |
| #ifdef Py_NAN |
| #define Py_RETURN_NAN return PyFloat_FromDouble(Py_NAN) |
| #endif |
| |
| #define Py_RETURN_INF(sign) do \ |
| if (copysign(1., sign) == 1.) { \ |
| return PyFloat_FromDouble(Py_HUGE_VAL); \ |
| } else { \ |
| return PyFloat_FromDouble(-Py_HUGE_VAL); \ |
| } while(0) |
| |
| PyAPI_FUNC(double) PyFloat_GetMax(void); |
| PyAPI_FUNC(double) PyFloat_GetMin(void); |
| PyAPI_FUNC(PyObject *) PyFloat_GetInfo(void); |
| |
| /* Return Python float from string PyObject. */ |
| PyAPI_FUNC(PyObject *) PyFloat_FromString(PyObject*); |
| |
| /* Return Python float from C double. */ |
| PyAPI_FUNC(PyObject *) PyFloat_FromDouble(double); |
| |
| /* Extract C double from Python float. The macro version trades safety for |
| speed. */ |
| PyAPI_FUNC(double) PyFloat_AsDouble(PyObject *); |
| #define PyFloat_AS_DOUBLE(op) (((PyFloatObject *)(op))->ob_fval) |
| |
| /* _PyFloat_{Pack,Unpack}{4,8} |
| * |
| * The struct and pickle (at least) modules need an efficient platform- |
| * independent way to store floating-point values as byte strings. |
| * The Pack routines produce a string from a C double, and the Unpack |
| * routines produce a C double from such a string. The suffix (4 or 8) |
| * specifies the number of bytes in the string. |
| * |
| * On platforms that appear to use (see _PyFloat_Init()) IEEE-754 formats |
| * these functions work by copying bits. On other platforms, the formats the |
| * 4- byte format is identical to the IEEE-754 single precision format, and |
| * the 8-byte format to the IEEE-754 double precision format, although the |
| * packing of INFs and NaNs (if such things exist on the platform) isn't |
| * handled correctly, and attempting to unpack a string containing an IEEE |
| * INF or NaN will raise an exception. |
| * |
| * On non-IEEE platforms with more precision, or larger dynamic range, than |
| * 754 supports, not all values can be packed; on non-IEEE platforms with less |
| * precision, or smaller dynamic range, not all values can be unpacked. What |
| * happens in such cases is partly accidental (alas). |
| */ |
| |
| /* The pack routines write 4 or 8 bytes, starting at p. le is a bool |
| * argument, true if you want the string in little-endian format (exponent |
| * last, at p+3 or p+7), false if you want big-endian format (exponent |
| * first, at p). |
| * Return value: 0 if all is OK, -1 if error (and an exception is |
| * set, most likely OverflowError). |
| * There are two problems on non-IEEE platforms: |
| * 1): What this does is undefined if x is a NaN or infinity. |
| * 2): -0.0 and +0.0 produce the same string. |
| */ |
| PyAPI_FUNC(int) _PyFloat_Pack4(double x, unsigned char *p, int le); |
| PyAPI_FUNC(int) _PyFloat_Pack8(double x, unsigned char *p, int le); |
| |
| /* Needed for the old way for marshal to store a floating point number. |
| Returns the string length copied into p, -1 on error. |
| */ |
| PyAPI_FUNC(int) _PyFloat_Repr(double x, char *p, size_t len); |
| |
| /* Used to get the important decimal digits of a double */ |
| PyAPI_FUNC(int) _PyFloat_Digits(char *buf, double v, int *signum); |
| PyAPI_FUNC(void) _PyFloat_DigitsInit(void); |
| |
| /* The unpack routines read 4 or 8 bytes, starting at p. le is a bool |
| * argument, true if the string is in little-endian format (exponent |
| * last, at p+3 or p+7), false if big-endian (exponent first, at p). |
| * Return value: The unpacked double. On error, this is -1.0 and |
| * PyErr_Occurred() is true (and an exception is set, most likely |
| * OverflowError). Note that on a non-IEEE platform this will refuse |
| * to unpack a string that represents a NaN or infinity. |
| */ |
| PyAPI_FUNC(double) _PyFloat_Unpack4(const unsigned char *p, int le); |
| PyAPI_FUNC(double) _PyFloat_Unpack8(const unsigned char *p, int le); |
| |
| /* free list api */ |
| PyAPI_FUNC(void) PyFloat_CompactFreeList(size_t *, size_t *, size_t *); |
| |
| #ifdef __cplusplus |
| } |
| #endif |
| #endif /* !Py_FLOATOBJECT_H */ |