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exceptions.c
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3071 lines (2665 loc) · 87.4 KB
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/*
* New exceptions.c written in Iceland by Richard Jones and Georg Brandl.
*
* Thanks go to Tim Peters and Michael Hudson for debugging.
*/
#define PY_SSIZE_T_CLEAN
#include <Python.h>
#include "pycore_initconfig.h"
#include "pycore_object.h"
#include "structmember.h" // PyMemberDef
#include "osdefs.h" // SEP
/* Compatibility aliases */
PyObject *PyExc_EnvironmentError = NULL;
PyObject *PyExc_IOError = NULL;
#ifdef MS_WINDOWS
PyObject *PyExc_WindowsError = NULL;
#endif
/* The dict map from errno codes to OSError subclasses */
static PyObject *errnomap = NULL;
/* NOTE: If the exception class hierarchy changes, don't forget to update
* Lib/test/exception_hierarchy.txt
*/
/*
* BaseException
*/
static PyObject *
BaseException_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
PyBaseExceptionObject *self;
self = (PyBaseExceptionObject *)type->tp_alloc(type, 0);
if (!self)
return NULL;
/* the dict is created on the fly in PyObject_GenericSetAttr */
self->dict = NULL;
self->traceback = self->cause = self->context = NULL;
self->suppress_context = 0;
if (args) {
self->args = args;
Py_INCREF(args);
return (PyObject *)self;
}
self->args = PyTuple_New(0);
if (!self->args) {
Py_DECREF(self);
return NULL;
}
return (PyObject *)self;
}
static int
BaseException_init(PyBaseExceptionObject *self, PyObject *args, PyObject *kwds)
{
if (!_PyArg_NoKeywords(Py_TYPE(self)->tp_name, kwds))
return -1;
Py_INCREF(args);
Py_XSETREF(self->args, args);
return 0;
}
static int
BaseException_clear(PyBaseExceptionObject *self)
{
Py_CLEAR(self->dict);
Py_CLEAR(self->args);
Py_CLEAR(self->traceback);
Py_CLEAR(self->cause);
Py_CLEAR(self->context);
return 0;
}
static void
BaseException_dealloc(PyBaseExceptionObject *self)
{
_PyObject_GC_UNTRACK(self);
BaseException_clear(self);
Py_TYPE(self)->tp_free((PyObject *)self);
}
static int
BaseException_traverse(PyBaseExceptionObject *self, visitproc visit, void *arg)
{
Py_VISIT(self->dict);
Py_VISIT(self->args);
Py_VISIT(self->traceback);
Py_VISIT(self->cause);
Py_VISIT(self->context);
return 0;
}
static PyObject *
BaseException_str(PyBaseExceptionObject *self)
{
switch (PyTuple_GET_SIZE(self->args)) {
case 0:
return PyUnicode_FromString("");
case 1:
return PyObject_Str(PyTuple_GET_ITEM(self->args, 0));
default:
return PyObject_Str(self->args);
}
}
static PyObject *
BaseException_repr(PyBaseExceptionObject *self)
{
const char *name = _PyType_Name(Py_TYPE(self));
if (PyTuple_GET_SIZE(self->args) == 1)
return PyUnicode_FromFormat("%s(%R)", name,
PyTuple_GET_ITEM(self->args, 0));
else
return PyUnicode_FromFormat("%s%R", name, self->args);
}
/* Pickling support */
static PyObject *
BaseException_reduce(PyBaseExceptionObject *self, PyObject *Py_UNUSED(ignored))
{
if (self->args && self->dict)
return PyTuple_Pack(3, Py_TYPE(self), self->args, self->dict);
else
return PyTuple_Pack(2, Py_TYPE(self), self->args);
}
/*
* Needed for backward compatibility, since exceptions used to store
* all their attributes in the __dict__. Code is taken from cPickle's
* load_build function.
*/
static PyObject *
BaseException_setstate(PyObject *self, PyObject *state)
{
PyObject *d_key, *d_value;
Py_ssize_t i = 0;
if (state != Py_None) {
if (!PyDict_Check(state)) {
PyErr_SetString(PyExc_TypeError, "state is not a dictionary");
return NULL;
}
while (PyDict_Next(state, &i, &d_key, &d_value)) {
if (PyObject_SetAttr(self, d_key, d_value) < 0)
return NULL;
}
}
Py_RETURN_NONE;
}
static PyObject *
BaseException_with_traceback(PyObject *self, PyObject *tb) {
if (PyException_SetTraceback(self, tb))
return NULL;
Py_INCREF(self);
return self;
}
PyDoc_STRVAR(with_traceback_doc,
"Exception.with_traceback(tb) --\n\
set self.__traceback__ to tb and return self.");
static PyMethodDef BaseException_methods[] = {
{"__reduce__", (PyCFunction)BaseException_reduce, METH_NOARGS },
{"__setstate__", (PyCFunction)BaseException_setstate, METH_O },
{"with_traceback", (PyCFunction)BaseException_with_traceback, METH_O,
with_traceback_doc},
{NULL, NULL, 0, NULL},
};
static PyObject *
BaseException_get_args(PyBaseExceptionObject *self, void *Py_UNUSED(ignored))
{
if (self->args == NULL) {
Py_RETURN_NONE;
}
Py_INCREF(self->args);
return self->args;
}
static int
BaseException_set_args(PyBaseExceptionObject *self, PyObject *val, void *Py_UNUSED(ignored))
{
PyObject *seq;
if (val == NULL) {
PyErr_SetString(PyExc_TypeError, "args may not be deleted");
return -1;
}
seq = PySequence_Tuple(val);
if (!seq)
return -1;
Py_XSETREF(self->args, seq);
return 0;
}
static PyObject *
BaseException_get_tb(PyBaseExceptionObject *self, void *Py_UNUSED(ignored))
{
if (self->traceback == NULL) {
Py_RETURN_NONE;
}
Py_INCREF(self->traceback);
return self->traceback;
}
static int
BaseException_set_tb(PyBaseExceptionObject *self, PyObject *tb, void *Py_UNUSED(ignored))
{
if (tb == NULL) {
PyErr_SetString(PyExc_TypeError, "__traceback__ may not be deleted");
return -1;
}
else if (!(tb == Py_None || PyTraceBack_Check(tb))) {
PyErr_SetString(PyExc_TypeError,
"__traceback__ must be a traceback or None");
return -1;
}
Py_INCREF(tb);
Py_XSETREF(self->traceback, tb);
return 0;
}
static PyObject *
BaseException_get_context(PyObject *self, void *Py_UNUSED(ignored))
{
PyObject *res = PyException_GetContext(self);
if (res)
return res; /* new reference already returned above */
Py_RETURN_NONE;
}
static int
BaseException_set_context(PyObject *self, PyObject *arg, void *Py_UNUSED(ignored))
{
if (arg == NULL) {
PyErr_SetString(PyExc_TypeError, "__context__ may not be deleted");
return -1;
} else if (arg == Py_None) {
arg = NULL;
} else if (!PyExceptionInstance_Check(arg)) {
PyErr_SetString(PyExc_TypeError, "exception context must be None "
"or derive from BaseException");
return -1;
} else {
/* PyException_SetContext steals this reference */
Py_INCREF(arg);
}
PyException_SetContext(self, arg);
return 0;
}
static PyObject *
BaseException_get_cause(PyObject *self, void *Py_UNUSED(ignored))
{
PyObject *res = PyException_GetCause(self);
if (res)
return res; /* new reference already returned above */
Py_RETURN_NONE;
}
static int
BaseException_set_cause(PyObject *self, PyObject *arg, void *Py_UNUSED(ignored))
{
if (arg == NULL) {
PyErr_SetString(PyExc_TypeError, "__cause__ may not be deleted");
return -1;
} else if (arg == Py_None) {
arg = NULL;
} else if (!PyExceptionInstance_Check(arg)) {
PyErr_SetString(PyExc_TypeError, "exception cause must be None "
"or derive from BaseException");
return -1;
} else {
/* PyException_SetCause steals this reference */
Py_INCREF(arg);
}
PyException_SetCause(self, arg);
return 0;
}
static PyGetSetDef BaseException_getset[] = {
{"__dict__", PyObject_GenericGetDict, PyObject_GenericSetDict},
{"args", (getter)BaseException_get_args, (setter)BaseException_set_args},
{"__traceback__", (getter)BaseException_get_tb, (setter)BaseException_set_tb},
{"__context__", BaseException_get_context,
BaseException_set_context, PyDoc_STR("exception context")},
{"__cause__", BaseException_get_cause,
BaseException_set_cause, PyDoc_STR("exception cause")},
{NULL},
};
static inline PyBaseExceptionObject*
_PyBaseExceptionObject_cast(PyObject *exc)
{
assert(PyExceptionInstance_Check(exc));
return (PyBaseExceptionObject *)exc;
}
PyObject *
PyException_GetTraceback(PyObject *self)
{
PyBaseExceptionObject *base_self = _PyBaseExceptionObject_cast(self);
Py_XINCREF(base_self->traceback);
return base_self->traceback;
}
int
PyException_SetTraceback(PyObject *self, PyObject *tb)
{
return BaseException_set_tb(_PyBaseExceptionObject_cast(self), tb, NULL);
}
PyObject *
PyException_GetCause(PyObject *self)
{
PyObject *cause = _PyBaseExceptionObject_cast(self)->cause;
Py_XINCREF(cause);
return cause;
}
/* Steals a reference to cause */
void
PyException_SetCause(PyObject *self, PyObject *cause)
{
PyBaseExceptionObject *base_self = _PyBaseExceptionObject_cast(self);
base_self->suppress_context = 1;
Py_XSETREF(base_self->cause, cause);
}
PyObject *
PyException_GetContext(PyObject *self)
{
PyObject *context = _PyBaseExceptionObject_cast(self)->context;
Py_XINCREF(context);
return context;
}
/* Steals a reference to context */
void
PyException_SetContext(PyObject *self, PyObject *context)
{
Py_XSETREF(_PyBaseExceptionObject_cast(self)->context, context);
}
#undef PyExceptionClass_Name
const char *
PyExceptionClass_Name(PyObject *ob)
{
assert(PyExceptionClass_Check(ob));
return ((PyTypeObject*)ob)->tp_name;
}
static struct PyMemberDef BaseException_members[] = {
{"__suppress_context__", T_BOOL,
offsetof(PyBaseExceptionObject, suppress_context)},
{NULL}
};
static PyTypeObject _PyExc_BaseException = {
PyVarObject_HEAD_INIT(NULL, 0)
"BaseException", /*tp_name*/
sizeof(PyBaseExceptionObject), /*tp_basicsize*/
0, /*tp_itemsize*/
(destructor)BaseException_dealloc, /*tp_dealloc*/
0, /*tp_vectorcall_offset*/
0, /*tp_getattr*/
0, /*tp_setattr*/
0, /*tp_as_async*/
(reprfunc)BaseException_repr, /*tp_repr*/
0, /*tp_as_number*/
0, /*tp_as_sequence*/
0, /*tp_as_mapping*/
0, /*tp_hash */
0, /*tp_call*/
(reprfunc)BaseException_str, /*tp_str*/
PyObject_GenericGetAttr, /*tp_getattro*/
PyObject_GenericSetAttr, /*tp_setattro*/
0, /*tp_as_buffer*/
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC |
Py_TPFLAGS_BASE_EXC_SUBCLASS, /*tp_flags*/
PyDoc_STR("Common base class for all exceptions"), /* tp_doc */
(traverseproc)BaseException_traverse, /* tp_traverse */
(inquiry)BaseException_clear, /* tp_clear */
0, /* tp_richcompare */
0, /* tp_weaklistoffset */
0, /* tp_iter */
0, /* tp_iternext */
BaseException_methods, /* tp_methods */
BaseException_members, /* tp_members */
BaseException_getset, /* tp_getset */
0, /* tp_base */
0, /* tp_dict */
0, /* tp_descr_get */
0, /* tp_descr_set */
offsetof(PyBaseExceptionObject, dict), /* tp_dictoffset */
(initproc)BaseException_init, /* tp_init */
0, /* tp_alloc */
BaseException_new, /* tp_new */
};
/* the CPython API expects exceptions to be (PyObject *) - both a hold-over
from the previous implementation and also allowing Python objects to be used
in the API */
PyObject *PyExc_BaseException = (PyObject *)&_PyExc_BaseException;
/* note these macros omit the last semicolon so the macro invocation may
* include it and not look strange.
*/
#define SimpleExtendsException(EXCBASE, EXCNAME, EXCDOC) \
static PyTypeObject _PyExc_ ## EXCNAME = { \
PyVarObject_HEAD_INIT(NULL, 0) \
# EXCNAME, \
sizeof(PyBaseExceptionObject), \
0, (destructor)BaseException_dealloc, 0, 0, 0, 0, 0, 0, 0, \
0, 0, 0, 0, 0, 0, 0, \
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC, \
PyDoc_STR(EXCDOC), (traverseproc)BaseException_traverse, \
(inquiry)BaseException_clear, 0, 0, 0, 0, 0, 0, 0, &_ ## EXCBASE, \
0, 0, 0, offsetof(PyBaseExceptionObject, dict), \
(initproc)BaseException_init, 0, BaseException_new,\
}; \
PyObject *PyExc_ ## EXCNAME = (PyObject *)&_PyExc_ ## EXCNAME
#define MiddlingExtendsException(EXCBASE, EXCNAME, EXCSTORE, EXCDOC) \
static PyTypeObject _PyExc_ ## EXCNAME = { \
PyVarObject_HEAD_INIT(NULL, 0) \
# EXCNAME, \
sizeof(Py ## EXCSTORE ## Object), \
0, (destructor)EXCSTORE ## _dealloc, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
0, 0, 0, 0, 0, \
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC, \
PyDoc_STR(EXCDOC), (traverseproc)EXCSTORE ## _traverse, \
(inquiry)EXCSTORE ## _clear, 0, 0, 0, 0, 0, 0, 0, &_ ## EXCBASE, \
0, 0, 0, offsetof(Py ## EXCSTORE ## Object, dict), \
(initproc)EXCSTORE ## _init, 0, 0, \
}; \
PyObject *PyExc_ ## EXCNAME = (PyObject *)&_PyExc_ ## EXCNAME
#define ComplexExtendsException(EXCBASE, EXCNAME, EXCSTORE, EXCNEW, \
EXCMETHODS, EXCMEMBERS, EXCGETSET, \
EXCSTR, EXCDOC) \
static PyTypeObject _PyExc_ ## EXCNAME = { \
PyVarObject_HEAD_INIT(NULL, 0) \
# EXCNAME, \
sizeof(Py ## EXCSTORE ## Object), 0, \
(destructor)EXCSTORE ## _dealloc, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, \
(reprfunc)EXCSTR, 0, 0, 0, \
Py_TPFLAGS_DEFAULT | Py_TPFLAGS_BASETYPE | Py_TPFLAGS_HAVE_GC, \
PyDoc_STR(EXCDOC), (traverseproc)EXCSTORE ## _traverse, \
(inquiry)EXCSTORE ## _clear, 0, 0, 0, 0, EXCMETHODS, \
EXCMEMBERS, EXCGETSET, &_ ## EXCBASE, \
0, 0, 0, offsetof(Py ## EXCSTORE ## Object, dict), \
(initproc)EXCSTORE ## _init, 0, EXCNEW,\
}; \
PyObject *PyExc_ ## EXCNAME = (PyObject *)&_PyExc_ ## EXCNAME
/*
* Exception extends BaseException
*/
SimpleExtendsException(PyExc_BaseException, Exception,
"Common base class for all non-exit exceptions.");
/*
* TypeError extends Exception
*/
SimpleExtendsException(PyExc_Exception, TypeError,
"Inappropriate argument type.");
/*
* StopAsyncIteration extends Exception
*/
SimpleExtendsException(PyExc_Exception, StopAsyncIteration,
"Signal the end from iterator.__anext__().");
/*
* StopIteration extends Exception
*/
static PyMemberDef StopIteration_members[] = {
{"value", T_OBJECT, offsetof(PyStopIterationObject, value), 0,
PyDoc_STR("generator return value")},
{NULL} /* Sentinel */
};
static int
StopIteration_init(PyStopIterationObject *self, PyObject *args, PyObject *kwds)
{
Py_ssize_t size = PyTuple_GET_SIZE(args);
PyObject *value;
if (BaseException_init((PyBaseExceptionObject *)self, args, kwds) == -1)
return -1;
Py_CLEAR(self->value);
if (size > 0)
value = PyTuple_GET_ITEM(args, 0);
else
value = Py_None;
Py_INCREF(value);
self->value = value;
return 0;
}
static int
StopIteration_clear(PyStopIterationObject *self)
{
Py_CLEAR(self->value);
return BaseException_clear((PyBaseExceptionObject *)self);
}
static void
StopIteration_dealloc(PyStopIterationObject *self)
{
_PyObject_GC_UNTRACK(self);
StopIteration_clear(self);
Py_TYPE(self)->tp_free((PyObject *)self);
}
static int
StopIteration_traverse(PyStopIterationObject *self, visitproc visit, void *arg)
{
Py_VISIT(self->value);
return BaseException_traverse((PyBaseExceptionObject *)self, visit, arg);
}
ComplexExtendsException(
PyExc_Exception, /* base */
StopIteration, /* name */
StopIteration, /* prefix for *_init, etc */
0, /* new */
0, /* methods */
StopIteration_members, /* members */
0, /* getset */
0, /* str */
"Signal the end from iterator.__next__()."
);
/*
* GeneratorExit extends BaseException
*/
SimpleExtendsException(PyExc_BaseException, GeneratorExit,
"Request that a generator exit.");
/*
* SystemExit extends BaseException
*/
static int
SystemExit_init(PySystemExitObject *self, PyObject *args, PyObject *kwds)
{
Py_ssize_t size = PyTuple_GET_SIZE(args);
if (BaseException_init((PyBaseExceptionObject *)self, args, kwds) == -1)
return -1;
if (size == 0)
return 0;
if (size == 1) {
Py_INCREF(PyTuple_GET_ITEM(args, 0));
Py_XSETREF(self->code, PyTuple_GET_ITEM(args, 0));
}
else { /* size > 1 */
Py_INCREF(args);
Py_XSETREF(self->code, args);
}
return 0;
}
static int
SystemExit_clear(PySystemExitObject *self)
{
Py_CLEAR(self->code);
return BaseException_clear((PyBaseExceptionObject *)self);
}
static void
SystemExit_dealloc(PySystemExitObject *self)
{
_PyObject_GC_UNTRACK(self);
SystemExit_clear(self);
Py_TYPE(self)->tp_free((PyObject *)self);
}
static int
SystemExit_traverse(PySystemExitObject *self, visitproc visit, void *arg)
{
Py_VISIT(self->code);
return BaseException_traverse((PyBaseExceptionObject *)self, visit, arg);
}
static PyMemberDef SystemExit_members[] = {
{"code", T_OBJECT, offsetof(PySystemExitObject, code), 0,
PyDoc_STR("exception code")},
{NULL} /* Sentinel */
};
ComplexExtendsException(PyExc_BaseException, SystemExit, SystemExit,
0, 0, SystemExit_members, 0, 0,
"Request to exit from the interpreter.");
/*
* KeyboardInterrupt extends BaseException
*/
SimpleExtendsException(PyExc_BaseException, KeyboardInterrupt,
"Program interrupted by user.");
/*
* ImportError extends Exception
*/
static int
ImportError_init(PyImportErrorObject *self, PyObject *args, PyObject *kwds)
{
static char *kwlist[] = {"name", "path", 0};
PyObject *empty_tuple;
PyObject *msg = NULL;
PyObject *name = NULL;
PyObject *path = NULL;
if (BaseException_init((PyBaseExceptionObject *)self, args, NULL) == -1)
return -1;
empty_tuple = PyTuple_New(0);
if (!empty_tuple)
return -1;
if (!PyArg_ParseTupleAndKeywords(empty_tuple, kwds, "|$OO:ImportError", kwlist,
&name, &path)) {
Py_DECREF(empty_tuple);
return -1;
}
Py_DECREF(empty_tuple);
Py_XINCREF(name);
Py_XSETREF(self->name, name);
Py_XINCREF(path);
Py_XSETREF(self->path, path);
if (PyTuple_GET_SIZE(args) == 1) {
msg = PyTuple_GET_ITEM(args, 0);
Py_INCREF(msg);
}
Py_XSETREF(self->msg, msg);
return 0;
}
static int
ImportError_clear(PyImportErrorObject *self)
{
Py_CLEAR(self->msg);
Py_CLEAR(self->name);
Py_CLEAR(self->path);
return BaseException_clear((PyBaseExceptionObject *)self);
}
static void
ImportError_dealloc(PyImportErrorObject *self)
{
_PyObject_GC_UNTRACK(self);
ImportError_clear(self);
Py_TYPE(self)->tp_free((PyObject *)self);
}
static int
ImportError_traverse(PyImportErrorObject *self, visitproc visit, void *arg)
{
Py_VISIT(self->msg);
Py_VISIT(self->name);
Py_VISIT(self->path);
return BaseException_traverse((PyBaseExceptionObject *)self, visit, arg);
}
static PyObject *
ImportError_str(PyImportErrorObject *self)
{
if (self->msg && PyUnicode_CheckExact(self->msg)) {
Py_INCREF(self->msg);
return self->msg;
}
else {
return BaseException_str((PyBaseExceptionObject *)self);
}
}
static PyObject *
ImportError_getstate(PyImportErrorObject *self)
{
PyObject *dict = ((PyBaseExceptionObject *)self)->dict;
if (self->name || self->path) {
_Py_IDENTIFIER(name);
_Py_IDENTIFIER(path);
dict = dict ? PyDict_Copy(dict) : PyDict_New();
if (dict == NULL)
return NULL;
if (self->name && _PyDict_SetItemId(dict, &PyId_name, self->name) < 0) {
Py_DECREF(dict);
return NULL;
}
if (self->path && _PyDict_SetItemId(dict, &PyId_path, self->path) < 0) {
Py_DECREF(dict);
return NULL;
}
return dict;
}
else if (dict) {
Py_INCREF(dict);
return dict;
}
else {
Py_RETURN_NONE;
}
}
/* Pickling support */
static PyObject *
ImportError_reduce(PyImportErrorObject *self, PyObject *Py_UNUSED(ignored))
{
PyObject *res;
PyObject *args;
PyObject *state = ImportError_getstate(self);
if (state == NULL)
return NULL;
args = ((PyBaseExceptionObject *)self)->args;
if (state == Py_None)
res = PyTuple_Pack(2, Py_TYPE(self), args);
else
res = PyTuple_Pack(3, Py_TYPE(self), args, state);
Py_DECREF(state);
return res;
}
static PyMemberDef ImportError_members[] = {
{"msg", T_OBJECT, offsetof(PyImportErrorObject, msg), 0,
PyDoc_STR("exception message")},
{"name", T_OBJECT, offsetof(PyImportErrorObject, name), 0,
PyDoc_STR("module name")},
{"path", T_OBJECT, offsetof(PyImportErrorObject, path), 0,
PyDoc_STR("module path")},
{NULL} /* Sentinel */
};
static PyMethodDef ImportError_methods[] = {
{"__reduce__", (PyCFunction)ImportError_reduce, METH_NOARGS},
{NULL}
};
ComplexExtendsException(PyExc_Exception, ImportError,
ImportError, 0 /* new */,
ImportError_methods, ImportError_members,
0 /* getset */, ImportError_str,
"Import can't find module, or can't find name in "
"module.");
/*
* ModuleNotFoundError extends ImportError
*/
MiddlingExtendsException(PyExc_ImportError, ModuleNotFoundError, ImportError,
"Module not found.");
/*
* OSError extends Exception
*/
#ifdef MS_WINDOWS
#include "errmap.h"
#endif
/* Where a function has a single filename, such as open() or some
* of the os module functions, PyErr_SetFromErrnoWithFilename() is
* called, giving a third argument which is the filename. But, so
* that old code using in-place unpacking doesn't break, e.g.:
*
* except OSError, (errno, strerror):
*
* we hack args so that it only contains two items. This also
* means we need our own __str__() which prints out the filename
* when it was supplied.
*
* (If a function has two filenames, such as rename(), symlink(),
* or copy(), PyErr_SetFromErrnoWithFilenameObjects() is called,
* which allows passing in a second filename.)
*/
/* This function doesn't cleanup on error, the caller should */
static int
oserror_parse_args(PyObject **p_args,
PyObject **myerrno, PyObject **strerror,
PyObject **filename, PyObject **filename2
#ifdef MS_WINDOWS
, PyObject **winerror
#endif
)
{
Py_ssize_t nargs;
PyObject *args = *p_args;
#ifndef MS_WINDOWS
/*
* ignored on non-Windows platforms,
* but parsed so OSError has a consistent signature
*/
PyObject *_winerror = NULL;
PyObject **winerror = &_winerror;
#endif /* MS_WINDOWS */
nargs = PyTuple_GET_SIZE(args);
if (nargs >= 2 && nargs <= 5) {
if (!PyArg_UnpackTuple(args, "OSError", 2, 5,
myerrno, strerror,
filename, winerror, filename2))
return -1;
#ifdef MS_WINDOWS
if (*winerror && PyLong_Check(*winerror)) {
long errcode, winerrcode;
PyObject *newargs;
Py_ssize_t i;
winerrcode = PyLong_AsLong(*winerror);
if (winerrcode == -1 && PyErr_Occurred())
return -1;
errcode = winerror_to_errno(winerrcode);
*myerrno = PyLong_FromLong(errcode);
if (!*myerrno)
return -1;
newargs = PyTuple_New(nargs);
if (!newargs)
return -1;
PyTuple_SET_ITEM(newargs, 0, *myerrno);
for (i = 1; i < nargs; i++) {
PyObject *val = PyTuple_GET_ITEM(args, i);
Py_INCREF(val);
PyTuple_SET_ITEM(newargs, i, val);
}
Py_DECREF(args);
args = *p_args = newargs;
}
#endif /* MS_WINDOWS */
}
return 0;
}
static int
oserror_init(PyOSErrorObject *self, PyObject **p_args,
PyObject *myerrno, PyObject *strerror,
PyObject *filename, PyObject *filename2
#ifdef MS_WINDOWS
, PyObject *winerror
#endif
)
{
PyObject *args = *p_args;
Py_ssize_t nargs = PyTuple_GET_SIZE(args);
/* self->filename will remain Py_None otherwise */
if (filename && filename != Py_None) {
if (Py_IS_TYPE(self, (PyTypeObject *) PyExc_BlockingIOError) &&
PyNumber_Check(filename)) {
/* BlockingIOError's 3rd argument can be the number of
* characters written.
*/
self->written = PyNumber_AsSsize_t(filename, PyExc_ValueError);
if (self->written == -1 && PyErr_Occurred())
return -1;
}
else {
Py_INCREF(filename);
self->filename = filename;
if (filename2 && filename2 != Py_None) {
Py_INCREF(filename2);
self->filename2 = filename2;
}
if (nargs >= 2 && nargs <= 5) {
/* filename, filename2, and winerror are removed from the args tuple
(for compatibility purposes, see test_exceptions.py) */
PyObject *subslice = PyTuple_GetSlice(args, 0, 2);
if (!subslice)
return -1;
Py_DECREF(args); /* replacing args */
*p_args = args = subslice;
}
}
}
Py_XINCREF(myerrno);
self->myerrno = myerrno;
Py_XINCREF(strerror);
self->strerror = strerror;
#ifdef MS_WINDOWS
Py_XINCREF(winerror);
self->winerror = winerror;
#endif
/* Steals the reference to args */
Py_XSETREF(self->args, args);
*p_args = args = NULL;
return 0;
}
static PyObject *
OSError_new(PyTypeObject *type, PyObject *args, PyObject *kwds);
static int
OSError_init(PyOSErrorObject *self, PyObject *args, PyObject *kwds);
static int
oserror_use_init(PyTypeObject *type)
{
/* When __init__ is defined in an OSError subclass, we want any
extraneous argument to __new__ to be ignored. The only reasonable
solution, given __new__ takes a variable number of arguments,
is to defer arg parsing and initialization to __init__.
But when __new__ is overridden as well, it should call our __new__
with the right arguments.
(see http://bugs.python.org/issue12555#msg148829 )
*/
if (type->tp_init != (initproc) OSError_init &&
type->tp_new == (newfunc) OSError_new) {
assert((PyObject *) type != PyExc_OSError);
return 1;
}
return 0;
}
static PyObject *
OSError_new(PyTypeObject *type, PyObject *args, PyObject *kwds)
{
PyOSErrorObject *self = NULL;
PyObject *myerrno = NULL, *strerror = NULL;
PyObject *filename = NULL, *filename2 = NULL;
#ifdef MS_WINDOWS
PyObject *winerror = NULL;
#endif
Py_INCREF(args);
if (!oserror_use_init(type)) {
if (!_PyArg_NoKeywords(type->tp_name, kwds))
goto error;
if (oserror_parse_args(&args, &myerrno, &strerror,
&filename, &filename2
#ifdef MS_WINDOWS
, &winerror
#endif
))
goto error;
if (myerrno && PyLong_Check(myerrno) &&
errnomap && (PyObject *) type == PyExc_OSError) {
PyObject *newtype;
newtype = PyDict_GetItemWithError(errnomap, myerrno);
if (newtype) {
assert(PyType_Check(newtype));
type = (PyTypeObject *) newtype;
}
else if (PyErr_Occurred())
goto error;
}
}
self = (PyOSErrorObject *) type->tp_alloc(type, 0);
if (!self)
goto error;
self->dict = NULL;
self->traceback = self->cause = self->context = NULL;
self->written = -1;