Mercurial > cpython-lru_cache-weakref

annotate Include/floatobject.h @ 39496:352ffe77b71d legacy-trunk

Find changesets by keywords (author, files, the commit message), revision number or hash, or revset expression.
Patch #1535500: fix segfault in BZ2File.writelines and make sure it raises the correct exceptions.
author Georg Brandl <georg@python.org>
date Mon, 14 Aug 2006 21:42:55 +0000
parents 1dd8a0d64432
children 6620a510e9a9 195f689af5af
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
rev   line source
145
853b736a6a9e Added copyright notice.
Guido van Rossum <guido@python.org>
parents: 6
diff changeset
1
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
2 /* Float object interface */
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
3
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
4 /*
2129
05360cd616ae The great renaming, phase two: all header files have been updated to
Guido van Rossum <guido@python.org>
parents: 2058
diff changeset
5 PyFloatObject represents a (double precision) floating point number.
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
6 */
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
7
13444
5709ddba423c ANSI-fication and Py_PROTO extermination.
Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
8 #ifndef Py_FLOATOBJECT_H
5709ddba423c ANSI-fication and Py_PROTO extermination.
Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
9 #define Py_FLOATOBJECT_H
5709ddba423c ANSI-fication and Py_PROTO extermination.
Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
10 #ifdef __cplusplus
5709ddba423c ANSI-fication and Py_PROTO extermination.
Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
11 extern "C" {
5709ddba423c ANSI-fication and Py_PROTO extermination.
Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
12 #endif
5709ddba423c ANSI-fication and Py_PROTO extermination.
Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
13
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
14 typedef struct {
13444
5709ddba423c ANSI-fication and Py_PROTO extermination.
Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
15 PyObject_HEAD
5709ddba423c ANSI-fication and Py_PROTO extermination.
Fred Drake <fdrake@acm.org>
parents: 13256
diff changeset
16 double ob_fval;
2129
05360cd616ae The great renaming, phase two: all header files have been updated to
Guido van Rossum <guido@python.org>
parents: 2058
diff changeset
17 } PyFloatObject;
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
18
24752
c1eb668525e1 Excise DL_EXPORT from Include.
Mark Hammond <mhammond@skippinet.com.au>
parents: 19839
diff changeset
19 PyAPI_DATA(PyTypeObject) PyFloat_Type;
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
20
19550
19d271f297dc Make the PyXXX_Check() macros for the numeric types inheritance-aware.
Guido van Rossum <guido@python.org>
parents: 17707
diff changeset
21 #define PyFloat_Check(op) PyObject_TypeCheck(op, &PyFloat_Type)
19839
10f5927dbf05 More for SF bug [#460020] bug or feature: unicode() and subclasses
Tim Peters <tim.peters@gmail.com>
parents: 19550
diff changeset
22 #define PyFloat_CheckExact(op) ((op)->ob_type == &PyFloat_Type)
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
23
17707
fe4c1034b480 SF bug #422177: Results from .pyc differs from .py
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
24 /* Return Python float from string PyObject. Second argument ignored on
fe4c1034b480 SF bug #422177: Results from .pyc differs from .py
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
25 input, and, if non-NULL, NULL is stored into *junk (this tried to serve a
fe4c1034b480 SF bug #422177: Results from .pyc differs from .py
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
26 purpose once but can't be made to work as intended). */
24752
c1eb668525e1 Excise DL_EXPORT from Include.
Mark Hammond <mhammond@skippinet.com.au>
parents: 19839
diff changeset
27 PyAPI_FUNC(PyObject *) PyFloat_FromString(PyObject*, char** junk);
17707
fe4c1034b480 SF bug #422177: Results from .pyc differs from .py
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
28
fe4c1034b480 SF bug #422177: Results from .pyc differs from .py
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
29 /* Return Python float from C double. */
24752
c1eb668525e1 Excise DL_EXPORT from Include.
Mark Hammond <mhammond@skippinet.com.au>
parents: 19839
diff changeset
30 PyAPI_FUNC(PyObject *) PyFloat_FromDouble(double);
17707
fe4c1034b480 SF bug #422177: Results from .pyc differs from .py
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
31
fe4c1034b480 SF bug #422177: Results from .pyc differs from .py
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
32 /* Extract C double from Python float. The macro version trades safety for
fe4c1034b480 SF bug #422177: Results from .pyc differs from .py
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
33 speed. */
24752
c1eb668525e1 Excise DL_EXPORT from Include.
Mark Hammond <mhammond@skippinet.com.au>
parents: 19839
diff changeset
34 PyAPI_FUNC(double) PyFloat_AsDouble(PyObject *);
17707
fe4c1034b480 SF bug #422177: Results from .pyc differs from .py
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
35 #define PyFloat_AS_DOUBLE(op) (((PyFloatObject *)(op))->ob_fval)
6
fc6fcd7df4f7 Initial revision
Guido van Rossum <guido@python.org>
parents:
diff changeset
36
17707
fe4c1034b480 SF bug #422177: Results from .pyc differs from .py
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
37 /* Write repr(v) into the char buffer argument, followed by null byte. The
fe4c1034b480 SF bug #422177: Results from .pyc differs from .py
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
38 buffer must be "big enough"; >= 100 is very safe.
fe4c1034b480 SF bug #422177: Results from .pyc differs from .py
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
39 PyFloat_AsReprString(buf, x) strives to print enough digits so that
fe4c1034b480 SF bug #422177: Results from .pyc differs from .py
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
40 PyFloat_FromString(buf) then reproduces x exactly. */
24752
c1eb668525e1 Excise DL_EXPORT from Include.
Mark Hammond <mhammond@skippinet.com.au>
parents: 19839
diff changeset
41 PyAPI_FUNC(void) PyFloat_AsReprString(char*, PyFloatObject *v);
17707
fe4c1034b480 SF bug #422177: Results from .pyc differs from .py
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
42
fe4c1034b480 SF bug #422177: Results from .pyc differs from .py
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
43 /* Write str(v) into the char buffer argument, followed by null byte. The
fe4c1034b480 SF bug #422177: Results from .pyc differs from .py
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
44 buffer must be "big enough"; >= 100 is very safe. Note that it's
fe4c1034b480 SF bug #422177: Results from .pyc differs from .py
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
45 unusual to be able to get back the float you started with from
fe4c1034b480 SF bug #422177: Results from .pyc differs from .py
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
46 PyFloat_AsString's result -- use PyFloat_AsReprString() if you want to
fe4c1034b480 SF bug #422177: Results from .pyc differs from .py
Tim Peters <tim.peters@gmail.com>
parents: 14375
diff changeset
47 preserve precision across conversions. */
24752
c1eb668525e1 Excise DL_EXPORT from Include.
Mark Hammond <mhammond@skippinet.com.au>
parents: 19839
diff changeset
48 PyAPI_FUNC(void) PyFloat_AsString(char*, PyFloatObject *v);
1329
519c25039c6a * Added support for X11 modules.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
49
28335
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
50 /* _PyFloat_{Pack,Unpack}{4,8}
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
51 *
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
52 * The struct and pickle (at least) modules need an efficient platform-
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
53 * independent way to store floating-point values as byte strings.
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
54 * The Pack routines produce a string from a C double, and the Unpack
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
55 * routines produce a C double from such a string. The suffix (4 or 8)
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
56 * specifies the number of bytes in the string.
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
57 *
34972
1dd8a0d64432 This is my patch:
Michael W. Hudson <mwh@python.net>
parents: 28335
diff changeset
58 * On platforms that appear to use (see _PyFloat_Init()) IEEE-754 formats
1dd8a0d64432 This is my patch:
Michael W. Hudson <mwh@python.net>
parents: 28335
diff changeset
59 * these functions work by copying bits. On other platforms, the formats the
1dd8a0d64432 This is my patch:
Michael W. Hudson <mwh@python.net>
parents: 28335
diff changeset
60 * 4- byte format is identical to the IEEE-754 single precision format, and
1dd8a0d64432 This is my patch:
Michael W. Hudson <mwh@python.net>
parents: 28335
diff changeset
61 * the 8-byte format to the IEEE-754 double precision format, although the
1dd8a0d64432 This is my patch:
Michael W. Hudson <mwh@python.net>
parents: 28335
diff changeset
62 * packing of INFs and NaNs (if such things exist on the platform) isn't
1dd8a0d64432 This is my patch:
Michael W. Hudson <mwh@python.net>
parents: 28335
diff changeset
63 * handled correctly, and attempting to unpack a string containing an IEEE
1dd8a0d64432 This is my patch:
Michael W. Hudson <mwh@python.net>
parents: 28335
diff changeset
64 * INF or NaN will raise an exception.
1dd8a0d64432 This is my patch:
Michael W. Hudson <mwh@python.net>
parents: 28335
diff changeset
65 *
1dd8a0d64432 This is my patch:
Michael W. Hudson <mwh@python.net>
parents: 28335
diff changeset
66 * On non-IEEE platforms with more precision, or larger dynamic range, than
1dd8a0d64432 This is my patch:
Michael W. Hudson <mwh@python.net>
parents: 28335
diff changeset
67 * 754 supports, not all values can be packed; on non-IEEE platforms with less
1dd8a0d64432 This is my patch:
Michael W. Hudson <mwh@python.net>
parents: 28335
diff changeset
68 * precision, or smaller dynamic range, not all values can be unpacked. What
1dd8a0d64432 This is my patch:
Michael W. Hudson <mwh@python.net>
parents: 28335
diff changeset
69 * happens in such cases is partly accidental (alas).
28335
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
70 */
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
71
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
72 /* The pack routines write 4 or 8 bytes, starting at p. le is a bool
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
73 * argument, true if you want the string in little-endian format (exponent
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
74 * last, at p+3 or p+7), false if you want big-endian format (exponent
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
75 * first, at p).
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
76 * Return value: 0 if all is OK, -1 if error (and an exception is
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
77 * set, most likely OverflowError).
34972
1dd8a0d64432 This is my patch:
Michael W. Hudson <mwh@python.net>
parents: 28335
diff changeset
78 * There are two problems on non-IEEE platforms:
1dd8a0d64432 This is my patch:
Michael W. Hudson <mwh@python.net>
parents: 28335
diff changeset
79 * 1): What this does is undefined if x is a NaN or infinity.
1dd8a0d64432 This is my patch:
Michael W. Hudson <mwh@python.net>
parents: 28335
diff changeset
80 * 2): -0.0 and +0.0 produce the same string.
28335
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
81 */
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
82 PyAPI_FUNC(int) _PyFloat_Pack4(double x, unsigned char *p, int le);
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
83 PyAPI_FUNC(int) _PyFloat_Pack8(double x, unsigned char *p, int le);
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
84
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
85 /* The unpack routines read 4 or 8 bytes, starting at p. le is a bool
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
86 * argument, true if the string is in little-endian format (exponent
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
87 * last, at p+3 or p+7), false if big-endian (exponent first, at p).
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
88 * Return value: The unpacked double. On error, this is -1.0 and
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
89 * PyErr_Occurred() is true (and an exception is set, most likely
34972
1dd8a0d64432 This is my patch:
Michael W. Hudson <mwh@python.net>
parents: 28335
diff changeset
90 * OverflowError). Note that on a non-IEEE platform this will refuse
1dd8a0d64432 This is my patch:
Michael W. Hudson <mwh@python.net>
parents: 28335
diff changeset
91 * to unpack a string that represents a NaN or infinity.
28335
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
92 */
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
93 PyAPI_FUNC(double) _PyFloat_Unpack4(const unsigned char *p, int le);
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
94 PyAPI_FUNC(double) _PyFloat_Unpack8(const unsigned char *p, int le);
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
95
70003b0cb837 New private API functions _PyFloat_{Pack,Unpack}(4,8}. This is a
Tim Peters <tim.peters@gmail.com>
parents: 24752
diff changeset
96
1329
519c25039c6a * Added support for X11 modules.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
97 #ifdef __cplusplus
519c25039c6a * Added support for X11 modules.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
98 }
519c25039c6a * Added support for X11 modules.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
99 #endif
519c25039c6a * Added support for X11 modules.
Guido van Rossum <guido@python.org>
parents: 1257
diff changeset
100 #endif /* !Py_FLOATOBJECT_H */