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python-cpython/Python/structmember.c at 2.3 · sthagen/python-cpython · GitHub
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sthagen
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python-cpython
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structmember.c
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/* Map C struct members to Python object attributes */
#include
"Python.h"
#include
"structmember.h"
static
PyObject
*
listmembers
(
struct
memberlist
*
mlist
)
{
int
i
,
n
;
PyObject
*
v
;
for
(
n
=
0
;
mlist
[
n
].
name
!=
NULL
;
n
++
)
;
v
=
PyList_New
(
n
);
if
(
v
!=
NULL
) {
for
(
i
=
0
;
i
<
n
;
i
++
)
PyList_SetItem
(
v
,
i
,
PyString_FromString
(
mlist
[
i
].
name
));
if
(
PyErr_Occurred
()) {
Py_DECREF
(
v
);
v
=
NULL
;
}
else
{
PyList_Sort
(
v
);
}
}
return
v
;
}
PyObject
*
PyMember_Get
(
char
*
addr
,
struct
memberlist
*
mlist
,
char
*
name
)
{
struct
memberlist
*
l
;
if
(
strcmp
(
name
,
"__members__"
)
==
0
)
return
listmembers
(
mlist
);
for
(
l
=
mlist
;
l
->
name
!=
NULL
;
l
++
) {
if
(
strcmp
(
l
->
name
,
name
)
==
0
) {
PyMemberDef
copy
;
copy
.
name
=
l
->
name
;
copy
.
type
=
l
->
type
;
copy
.
offset
=
l
->
offset
;
copy
.
flags
=
l
->
flags
;
copy
.
doc
=
NULL
;
return
PyMember_GetOne
(
addr
,
&
copy
);
}
}
PyErr_SetString
(
PyExc_AttributeError
,
name
);
return
NULL
;
}
PyObject
*
PyMember_GetOne
(
char
*
addr
,
PyMemberDef
*
l
)
{
PyObject
*
v
;
if
((
l
->
flags
&
READ_RESTRICTED
)
&&
PyEval_GetRestricted
()) {
PyErr_SetString
(
PyExc_RuntimeError
,
"restricted attribute"
);
return
NULL
;
}
addr
+=
l
->
offset
;
switch
(
l
->
type
) {
case
T_BYTE
:
v
=
PyInt_FromLong
(
(
long
) (((
*
(
char
*
)
addr
&
0xff
) ^
0x80
)
-
0x80
));
break
;
case
T_UBYTE
:
v
=
PyInt_FromLong
((
long
)
*
(
char
*
)
addr
&
0xff
);
break
;
case
T_SHORT
:
v
=
PyInt_FromLong
((
long
)
*
(
short
*
)
addr
);
break
;
case
T_USHORT
:
v
=
PyInt_FromLong
((
long
)
*
(
unsigned short
*
)
addr
);
break
;
case
T_INT
:
v
=
PyInt_FromLong
((
long
)
*
(
int
*
)
addr
);
break
;
case
T_UINT
:
v
=
PyInt_FromLong
((
long
)
*
(
unsigned
int
*
)
addr
);
break
;
case
T_LONG
:
v
=
PyInt_FromLong
(
*
(
long
*
)
addr
);
break
;
case
T_ULONG
:
v
=
PyLong_FromDouble
((
double
)
*
(
unsigned long
*
)
addr
);
break
;
case
T_FLOAT
:
v
=
PyFloat_FromDouble
((
double
)
*
(
float
*
)
addr
);
break
;
case
T_DOUBLE
:
v
=
PyFloat_FromDouble
(
*
(
double
*
)
addr
);
break
;
case
T_STRING
:
if
(
*
(
char
*
*
)
addr
==
NULL
) {
Py_INCREF
(
Py_None
);
v
=
Py_None
;
}
else
v
=
PyString_FromString
(
*
(
char
*
*
)
addr
);
break
;
case
T_STRING_INPLACE
:
v
=
PyString_FromString
((
char
*
)
addr
);
break
;
#ifdef
macintosh
case
T_PSTRING
:
if
(
*
(
char
*
*
)
addr
==
NULL
) {
Py_INCREF
(
Py_None
);
v
=
Py_None
;
}
else
v
=
PyString_FromStringAndSize
(
(
*
(
char
*
*
)
addr
)
+
1
,
*
*
(
unsigned
char
*
*
)
addr
);
break
;
case
T_PSTRING_INPLACE
:
v
=
PyString_FromStringAndSize
(
((
char
*
)
addr
)
+
1
,
*
(
unsigned
char
*
)
addr
);
break
;
#endif
/* macintosh */
case
T_CHAR
:
v
=
PyString_FromStringAndSize
((
char
*
)
addr
,
1
);
break
;
case
T_OBJECT
:
v
=
*
(
PyObject
*
*
)
addr
;
if
(
v
==
NULL
)
v
=
Py_None
;
Py_INCREF
(
v
);
break
;
case
T_OBJECT_EX
:
v
=
*
(
PyObject
*
*
)
addr
;
if
(
v
==
NULL
)
PyErr_SetString
(
PyExc_AttributeError
,
l
->
name
);
Py_XINCREF
(
v
);
break
;
default
:
PyErr_SetString
(
PyExc_SystemError
,
"bad memberdescr type"
);
v
=
NULL
;
}
return
v
;
}
int
PyMember_Set
(
char
*
addr
,
struct
memberlist
*
mlist
,
char
*
name
,
PyObject
*
v
)
{
struct
memberlist
*
l
;
for
(
l
=
mlist
;
l
->
name
!=
NULL
;
l
++
) {
if
(
strcmp
(
l
->
name
,
name
)
==
0
) {
PyMemberDef
copy
;
copy
.
name
=
l
->
name
;
copy
.
type
=
l
->
type
;
copy
.
offset
=
l
->
offset
;
copy
.
flags
=
l
->
flags
;
copy
.
doc
=
NULL
;
return
PyMember_SetOne
(
addr
,
&
copy
,
v
);
}
}
PyErr_SetString
(
PyExc_AttributeError
,
name
);
return
-1
;
}
int
PyMember_SetOne
(
char
*
addr
,
PyMemberDef
*
l
,
PyObject
*
v
)
{
PyObject
*
oldv
;
if
((
l
->
flags
&
READONLY
)
||
l
->
type
==
T_STRING
#ifdef
macintosh
||
l
->
type
==
T_PSTRING
#endif
)
{
PyErr_SetString
(
PyExc_TypeError
,
"readonly attribute"
);
return
-1
;
}
if
((
l
->
flags
&
WRITE_RESTRICTED
)
&&
PyEval_GetRestricted
()) {
PyErr_SetString
(
PyExc_RuntimeError
,
"restricted attribute"
);
return
-1
;
}
if
(
v
==
NULL
&&
l
->
type
!=
T_OBJECT_EX
&&
l
->
type
!=
T_OBJECT
) {
PyErr_SetString
(
PyExc_TypeError
,
"can't delete numeric/char attribute"
);
return
-1
;
}
addr
+=
l
->
offset
;
switch
(
l
->
type
) {
case
T_BYTE
:
case
T_UBYTE
:
if
(!
PyInt_Check
(
v
)) {
PyErr_BadArgument
();
return
-1
;
}
*
(
char
*
)
addr
=
(
char
)
PyInt_AsLong
(
v
);
break
;
case
T_SHORT
:
case
T_USHORT
:
if
(!
PyInt_Check
(
v
)) {
PyErr_BadArgument
();
return
-1
;
}
*
(
short
*
)
addr
=
(
short
)
PyInt_AsLong
(
v
);
break
;
case
T_UINT
:
case
T_INT
:
if
(!
PyInt_Check
(
v
)) {
PyErr_BadArgument
();
return
-1
;
}
*
(
int
*
)
addr
=
(
int
)
PyInt_AsLong
(
v
);
break
;
case
T_LONG
:
if
(!
PyInt_Check
(
v
)) {
PyErr_BadArgument
();
return
-1
;
}
*
(
long
*
)
addr
=
PyInt_AsLong
(
v
);
break
;
case
T_ULONG
:
if
(
PyInt_Check
(
v
))
*
(
long
*
)
addr
=
PyInt_AsLong
(
v
);
else
if
(
PyLong_Check
(
v
))
*
(
long
*
)
addr
=
PyLong_AsLong
(
v
);
else
{
PyErr_BadArgument
();
return
-1
;
}
break
;
case
T_FLOAT
:
if
(
PyInt_Check
(
v
))
*
(
float
*
)
addr
=
(
float
)
PyInt_AsLong
(
v
);
else
if
(
PyFloat_Check
(
v
))
*
(
float
*
)
addr
=
(
float
)
PyFloat_AsDouble
(
v
);
else
{
PyErr_BadArgument
();
return
-1
;
}
break
;
case
T_DOUBLE
:
if
(
PyInt_Check
(
v
))
*
(
double
*
)
addr
=
(
double
)
PyInt_AsLong
(
v
);
else
if
(
PyFloat_Check
(
v
))
*
(
double
*
)
addr
=
PyFloat_AsDouble
(
v
);
else
{
PyErr_BadArgument
();
return
-1
;
}
break
;
case
T_OBJECT
:
case
T_OBJECT_EX
:
Py_XINCREF
(
v
);
oldv
=
*
(
PyObject
*
*
)
addr
;
*
(
PyObject
*
*
)
addr
=
v
;
Py_XDECREF
(
oldv
);
break
;
case
T_CHAR
:
if
(
PyString_Check
(
v
)
&&
PyString_Size
(
v
)
==
1
) {
*
(
char
*
)
addr
=
PyString_AsString
(
v
)[
0
];
}
else
{
PyErr_BadArgument
();
return
-1
;
}
break
;
default
:
PyErr_Format
(
PyExc_SystemError
,
"bad memberdescr type for %s"
,
l
->
name
);
return
-1
;
}
return
0
;
}
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