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cpython/Objects/capsule.c at tkinter_docs · native-api/cpython · GitHub
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/* Wrap void * pointers to be passed between C modules */
#include
"Python.h"
/* Internal structure of PyCapsule */
typedef
struct
{
PyObject_HEAD
void
*
pointer
;
const
char
*
name
;
void
*
context
;
PyCapsule_Destructor
destructor
;
}
PyCapsule
;
static
int
_is_legal_capsule
(
PyCapsule
*
capsule
,
const
char
*
invalid_capsule
)
{
if
(!
capsule
||
!
PyCapsule_CheckExact
(
capsule
)
||
capsule
->
pointer
==
NULL
) {
PyErr_SetString
(
PyExc_ValueError
,
invalid_capsule
);
return
0
;
}
return
1
;
}
#define
is_legal_capsule
(
capsule
,
name
) \
(_is_legal_capsule(capsule, \
name " called with invalid PyCapsule object"))
static
int
name_matches
(
const
char
*
name1
,
const
char
*
name2
) {
/* if either is NULL, */
if
(!
name1
||
!
name2
) {
/* they're only the same if they're both NULL. */
return
name1
==
name2
;
}
return
!
strcmp
(
name1
,
name2
);
}
PyObject
*
PyCapsule_New
(
void
*
pointer
,
const
char
*
name
,
PyCapsule_Destructor
destructor
)
{
PyCapsule
*
capsule
;
if
(!
pointer
) {
PyErr_SetString
(
PyExc_ValueError
,
"PyCapsule_New called with null pointer"
);
return
NULL
;
}
capsule
=
PyObject_NEW
(
PyCapsule
,
&
PyCapsule_Type
);
if
(
capsule
==
NULL
) {
return
NULL
;
}
capsule
->
pointer
=
pointer
;
capsule
->
name
=
name
;
capsule
->
context
=
NULL
;
capsule
->
destructor
=
destructor
;
return
(
PyObject
*
)
capsule
;
}
int
PyCapsule_IsValid
(
PyObject
*
o
,
const
char
*
name
)
{
PyCapsule
*
capsule
=
(
PyCapsule
*
)
o
;
return
(
capsule
!=
NULL
&&
PyCapsule_CheckExact
(
capsule
)
&&
capsule
->
pointer
!=
NULL
&&
name_matches
(
capsule
->
name
,
name
));
}
void
*
PyCapsule_GetPointer
(
PyObject
*
o
,
const
char
*
name
)
{
PyCapsule
*
capsule
=
(
PyCapsule
*
)
o
;
if
(!
is_legal_capsule
(
capsule
,
"PyCapsule_GetPointer"
)) {
return
NULL
;
}
if
(!
name_matches
(
name
,
capsule
->
name
)) {
PyErr_SetString
(
PyExc_ValueError
,
"PyCapsule_GetPointer called with incorrect name"
);
return
NULL
;
}
return
capsule
->
pointer
;
}
const
char
*
PyCapsule_GetName
(
PyObject
*
o
)
{
PyCapsule
*
capsule
=
(
PyCapsule
*
)
o
;
if
(!
is_legal_capsule
(
capsule
,
"PyCapsule_GetName"
)) {
return
NULL
;
}
return
capsule
->
name
;
}
PyCapsule_Destructor
PyCapsule_GetDestructor
(
PyObject
*
o
)
{
PyCapsule
*
capsule
=
(
PyCapsule
*
)
o
;
if
(!
is_legal_capsule
(
capsule
,
"PyCapsule_GetDestructor"
)) {
return
NULL
;
}
return
capsule
->
destructor
;
}
void
*
PyCapsule_GetContext
(
PyObject
*
o
)
{
PyCapsule
*
capsule
=
(
PyCapsule
*
)
o
;
if
(!
is_legal_capsule
(
capsule
,
"PyCapsule_GetContext"
)) {
return
NULL
;
}
return
capsule
->
context
;
}
int
PyCapsule_SetPointer
(
PyObject
*
o
,
void
*
pointer
)
{
PyCapsule
*
capsule
=
(
PyCapsule
*
)
o
;
if
(!
pointer
) {
PyErr_SetString
(
PyExc_ValueError
,
"PyCapsule_SetPointer called with null pointer"
);
return
-1
;
}
if
(!
is_legal_capsule
(
capsule
,
"PyCapsule_SetPointer"
)) {
return
-1
;
}
capsule
->
pointer
=
pointer
;
return
0
;
}
int
PyCapsule_SetName
(
PyObject
*
o
,
const
char
*
name
)
{
PyCapsule
*
capsule
=
(
PyCapsule
*
)
o
;
if
(!
is_legal_capsule
(
capsule
,
"PyCapsule_SetName"
)) {
return
-1
;
}
capsule
->
name
=
name
;
return
0
;
}
int
PyCapsule_SetDestructor
(
PyObject
*
o
,
PyCapsule_Destructor
destructor
)
{
PyCapsule
*
capsule
=
(
PyCapsule
*
)
o
;
if
(!
is_legal_capsule
(
capsule
,
"PyCapsule_SetDestructor"
)) {
return
-1
;
}
capsule
->
destructor
=
destructor
;
return
0
;
}
int
PyCapsule_SetContext
(
PyObject
*
o
,
void
*
context
)
{
PyCapsule
*
capsule
=
(
PyCapsule
*
)
o
;
if
(!
is_legal_capsule
(
capsule
,
"PyCapsule_SetContext"
)) {
return
-1
;
}
capsule
->
context
=
context
;
return
0
;
}
void
*
PyCapsule_Import
(
const
char
*
name
,
int
no_block
)
{
PyObject
*
object
=
NULL
;
void
*
return_value
=
NULL
;
char
*
trace
;
size_t
name_length
=
(
strlen
(
name
)
+
1
)
*
sizeof
(
char
);
char
*
name_dup
=
(
char
*
)
PyMem_MALLOC
(
name_length
);
if
(!
name_dup
) {
return
NULL
;
}
memcpy
(
name_dup
,
name
,
name_length
);
trace
=
name_dup
;
while
(
trace
) {
char
*
dot
=
strchr
(
trace
,
'.'
);
if
(
dot
) {
*
dot
++
=
'\0'
;
}
if
(
object
==
NULL
) {
if
(
no_block
) {
object
=
PyImport_ImportModuleNoBlock
(
trace
);
}
else
{
object
=
PyImport_ImportModule
(
trace
);
if
(!
object
) {
PyErr_Format
(
PyExc_ImportError
,
"PyCapsule_Import could not import module \"%s\""
,
trace
);
}
}
}
else
{
PyObject
*
object2
=
PyObject_GetAttrString
(
object
,
trace
);
Py_DECREF
(
object
);
object
=
object2
;
}
if
(!
object
) {
goto
EXIT
;
}
trace
=
dot
;
}
/* compare attribute name to module.name by hand */
if
(
PyCapsule_IsValid
(
object
,
name
)) {
PyCapsule
*
capsule
=
(
PyCapsule
*
)
object
;
return_value
=
capsule
->
pointer
;
}
else
{
PyErr_Format
(
PyExc_AttributeError
,
"PyCapsule_Import \"%s\" is not valid"
,
name
);
}
EXIT
:
Py_XDECREF
(
object
);
if
(
name_dup
) {
PyMem_FREE
(
name_dup
);
}
return
return_value
;
}
static
void
capsule_dealloc
(
PyObject
*
o
)
{
PyCapsule
*
capsule
=
(
PyCapsule
*
)
o
;
if
(
capsule
->
destructor
) {
capsule
->
destructor
(
o
);
}
PyObject_DEL
(
o
);
}
static
PyObject
*
capsule_repr
(
PyObject
*
o
)
{
PyCapsule
*
capsule
=
(
PyCapsule
*
)
o
;
const
char
*
name
;
const
char
*
quote
;
if
(
capsule
->
name
) {
quote
=
"\""
;
name
=
capsule
->
name
;
}
else
{
quote
=
""
;
name
=
"NULL"
;
}
return
PyUnicode_FromFormat
(
"<capsule object %s%s%s at %p>"
,
quote
,
name
,
quote
,
capsule
);
}
PyDoc_STRVAR
(
PyCapsule_Type__doc__
,
"Capsule objects let you wrap a C \"void *\" pointer in a Python\n\
object. They're a way of passing data through the Python interpreter\n\
without creating your own custom type.\n\
\n\
Capsules are used for communication between extension modules.\n\
They provide a way for an extension module to export a C interface\n\
to other extension modules, so that extension modules can use the\n\
Python import mechanism to link to one another.\n\
"
);
PyTypeObject
PyCapsule_Type
=
{
PyVarObject_HEAD_INIT
(
&
PyType_Type
,
0
)
"PyCapsule"
,
/*tp_name*/
sizeof
(
PyCapsule
),
/*tp_basicsize*/
0
,
/*tp_itemsize*/
/* methods */
capsule_dealloc
,
/*tp_dealloc*/
0
,
/*tp_print*/
0
,
/*tp_getattr*/
0
,
/*tp_setattr*/
0
,
/*tp_reserved*/
capsule_repr
,
/*tp_repr*/
0
,
/*tp_as_number*/
0
,
/*tp_as_sequence*/
0
,
/*tp_as_mapping*/
0
,
/*tp_hash*/
0
,
/*tp_call*/
0
,
/*tp_str*/
0
,
/*tp_getattro*/
0
,
/*tp_setattro*/
0
,
/*tp_as_buffer*/
0
,
/*tp_flags*/
PyCapsule_Type__doc__
/*tp_doc*/
};
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