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cpython/Python/structmember.c at 2.7 · python-emscripten/cpython · GitHub
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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
(
const
char
*
addr
,
struct
memberlist
*
mlist
,
const
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
(
const
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_BOOL
:
v
=
PyBool_FromLong
(
*
(
char
*
)
addr
);
break
;
case
T_BYTE
:
v
=
PyInt_FromLong
(
*
(
char
*
)
addr
);
break
;
case
T_UBYTE
:
v
=
PyLong_FromUnsignedLong
(
*
(
unsigned
char
*
)
addr
);
break
;
case
T_SHORT
:
v
=
PyInt_FromLong
(
*
(
short
*
)
addr
);
break
;
case
T_USHORT
:
v
=
PyLong_FromUnsignedLong
(
*
(
unsigned short
*
)
addr
);
break
;
case
T_INT
:
v
=
PyInt_FromLong
(
*
(
int
*
)
addr
);
break
;
case
T_UINT
:
v
=
PyLong_FromUnsignedLong
(
*
(
unsigned
int
*
)
addr
);
break
;
case
T_LONG
:
v
=
PyInt_FromLong
(
*
(
long
*
)
addr
);
break
;
case
T_ULONG
:
v
=
PyLong_FromUnsignedLong
(
*
(
unsigned long
*
)
addr
);
break
;
case
T_PYSSIZET
:
v
=
PyInt_FromSsize_t
(
*
(
Py_ssize_t
*
)
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
;
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
;
#ifdef
HAVE_LONG_LONG
case
T_LONGLONG
:
v
=
PyLong_FromLongLong
(
*
(
PY_LONG_LONG
*
)
addr
);
break
;
case
T_ULONGLONG
:
v
=
PyLong_FromUnsignedLongLong
(
*
(
unsigned
PY_LONG_LONG
*
)
addr
);
break
;
#endif
/* HAVE_LONG_LONG */
default
:
PyErr_SetString
(
PyExc_SystemError
,
"bad memberdescr type"
);
v
=
NULL
;
}
return
v
;
}
int
PyMember_Set
(
char
*
addr
,
struct
memberlist
*
mlist
,
const
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
;
}
#define
WARN
(
msg
) \
do { \
if (PyErr_Warn(PyExc_RuntimeWarning, msg) < 0) \
return -1; \
} while (0)
int
PyMember_SetOne
(
char
*
addr
,
PyMemberDef
*
l
,
PyObject
*
v
)
{
PyObject
*
oldv
;
addr
+=
l
->
offset
;
if
((
l
->
flags
&
READONLY
))
{
PyErr_SetString
(
PyExc_TypeError
,
"readonly attribute"
);
return
-1
;
}
if
((
l
->
flags
&
PY_WRITE_RESTRICTED
)
&&
PyEval_GetRestricted
()) {
PyErr_SetString
(
PyExc_RuntimeError
,
"restricted attribute"
);
return
-1
;
}
if
(
v
==
NULL
) {
if
(
l
->
type
==
T_OBJECT_EX
) {
/* Check if the attribute is set. */
if
(
*
(
PyObject
*
*
)
addr
==
NULL
) {
PyErr_SetString
(
PyExc_AttributeError
,
l
->
name
);
return
-1
;
}
}
else
if
(
l
->
type
!=
T_OBJECT
) {
PyErr_SetString
(
PyExc_TypeError
,
"can't delete numeric/char attribute"
);
return
-1
;
}
}
switch
(
l
->
type
) {
case
T_BOOL
:{
if
(!
PyBool_Check
(
v
)) {
PyErr_SetString
(
PyExc_TypeError
,
"attribute value type must be bool"
);
return
-1
;
}
if
(
v
==
Py_True
)
*
(
char
*
)
addr
=
(
char
)
1
;
else
*
(
char
*
)
addr
=
(
char
)
0
;
break
;
}
case
T_BYTE
:{
long
long_val
=
PyInt_AsLong
(
v
);
if
((
long_val
==
-1
)
&&
PyErr_Occurred
())
return
-1
;
*
(
char
*
)
addr
=
(
char
)
long_val
;
/* XXX: For compatibility, only warn about truncations
for now. */
if
((
long_val
>
CHAR_MAX
)
||
(
long_val
<
CHAR_MIN
))
WARN
(
"Truncation of value to char"
);
break
;
}
case
T_UBYTE
:{
long
long_val
=
PyInt_AsLong
(
v
);
if
((
long_val
==
-1
)
&&
PyErr_Occurred
())
return
-1
;
*
(
unsigned
char
*
)
addr
=
(
unsigned
char
)
long_val
;
if
((
long_val
>
UCHAR_MAX
)
||
(
long_val
<
0
))
WARN
(
"Truncation of value to unsigned char"
);
break
;
}
case
T_SHORT
:{
long
long_val
=
PyInt_AsLong
(
v
);
if
((
long_val
==
-1
)
&&
PyErr_Occurred
())
return
-1
;
*
(
short
*
)
addr
=
(
short
)
long_val
;
if
((
long_val
>
SHRT_MAX
)
||
(
long_val
<
SHRT_MIN
))
WARN
(
"Truncation of value to short"
);
break
;
}
case
T_USHORT
:{
long
long_val
=
PyInt_AsLong
(
v
);
if
((
long_val
==
-1
)
&&
PyErr_Occurred
())
return
-1
;
*
(
unsigned short
*
)
addr
=
(
unsigned short
)
long_val
;
if
((
long_val
>
USHRT_MAX
)
||
(
long_val
<
0
))
WARN
(
"Truncation of value to unsigned short"
);
break
;
}
case
T_INT
:{
long
long_val
=
PyInt_AsLong
(
v
);
if
((
long_val
==
-1
)
&&
PyErr_Occurred
())
return
-1
;
*
(
int
*
)
addr
=
(
int
)
long_val
;
if
((
long_val
>
INT_MAX
)
||
(
long_val
<
INT_MIN
))
WARN
(
"Truncation of value to int"
);
break
;
}
case
T_UINT
:{
unsigned long
ulong_val
=
PyLong_AsUnsignedLong
(
v
);
if
((
ulong_val
==
(
unsigned long
)
-1
)
&&
PyErr_Occurred
()) {
/* XXX: For compatibility, accept negative int values
as well. */
PyErr_Clear
();
ulong_val
=
PyLong_AsLong
(
v
);
if
((
ulong_val
==
(
unsigned long
)
-1
)
&&
PyErr_Occurred
())
return
-1
;
*
(
unsigned
int
*
)
addr
=
(
unsigned
int
)
ulong_val
;
WARN
(
"Writing negative value into unsigned field"
);
}
else
*
(
unsigned
int
*
)
addr
=
(
unsigned
int
)
ulong_val
;
if
(
ulong_val
>
UINT_MAX
)
WARN
(
"Truncation of value to unsigned int"
);
break
;
}
case
T_LONG
:{
*
(
long
*
)
addr
=
PyLong_AsLong
(
v
);
if
((
*
(
long
*
)
addr
==
-1
)
&&
PyErr_Occurred
())
return
-1
;
break
;
}
case
T_ULONG
:{
*
(
unsigned long
*
)
addr
=
PyLong_AsUnsignedLong
(
v
);
if
((
*
(
unsigned long
*
)
addr
==
(
unsigned long
)
-1
)
&&
PyErr_Occurred
()) {
/* XXX: For compatibility, accept negative int values
as well. */
PyErr_Clear
();
*
(
unsigned long
*
)
addr
=
PyLong_AsLong
(
v
);
if
((
*
(
unsigned long
*
)
addr
==
(
unsigned long
)
-1
)
&&
PyErr_Occurred
())
return
-1
;
WARN
(
"Writing negative value into unsigned field"
);
}
break
;
}
case
T_PYSSIZET
:{
*
(
Py_ssize_t
*
)
addr
=
PyInt_AsSsize_t
(
v
);
if
((
*
(
Py_ssize_t
*
)
addr
==
(
Py_ssize_t
)
-
1
)
&&
PyErr_Occurred
())
return
-1
;
break
;
}
case
T_FLOAT
:{
double
double_val
=
PyFloat_AsDouble
(
v
);
if
((
double_val
==
-1
)
&&
PyErr_Occurred
())
return
-1
;
*
(
float
*
)
addr
=
(
float
)
double_val
;
break
;
}
case
T_DOUBLE
:
*
(
double
*
)
addr
=
PyFloat_AsDouble
(
v
);
if
((
*
(
double
*
)
addr
==
-1
)
&&
PyErr_Occurred
())
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
;
case
T_STRING
:
case
T_STRING_INPLACE
:
PyErr_SetString
(
PyExc_TypeError
,
"readonly attribute"
);
return
-1
;
#ifdef
HAVE_LONG_LONG
case
T_LONGLONG
:{
PY_LONG_LONG
value
;
*
(
PY_LONG_LONG
*
)
addr
=
value
=
PyLong_AsLongLong
(
v
);
if
((
value
==
-1
)
&&
PyErr_Occurred
())
return
-1
;
break
;
}
case
T_ULONGLONG
:{
unsigned
PY_LONG_LONG
value
;
/* ??? PyLong_AsLongLong accepts an int, but PyLong_AsUnsignedLongLong
doesn't ??? */
if
(
PyLong_Check
(
v
))
*
(
unsigned
PY_LONG_LONG
*
)
addr
=
value
=
PyLong_AsUnsignedLongLong
(
v
);
else
*
(
unsigned
PY_LONG_LONG
*
)
addr
=
value
=
PyInt_AsLong
(
v
);
if
((
value
==
(
unsigned
PY_LONG_LONG
)
-1
)
&&
PyErr_Occurred
())
return
-1
;
break
;
}
#endif
/* HAVE_LONG_LONG */
default
:
PyErr_Format
(
PyExc_SystemError
,
"bad memberdescr type for %s"
,
l
->
name
);
return
-1
;
}
return
0
;
}
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