Python/errors.c - platform/external/python/cpython2 - Gitiles

 /***********************************************************
 Copyright (c) 2000, BeOpen.com.
 Copyright (c) 1995-2000, Corporation for National Research Initiatives.
 Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
 All rights reserved.

 See the file "Misc/COPYRIGHT" for information on usage and
 redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 ******************************************************************/

 /* Error handling */

 #include "Python.h"

 #ifdef SYMANTEC__CFM68K__
 #pragma lib_export on
 #endif

 #ifdef macintosh
 extern char *PyMac_StrError(int);
 #undef strerror
 #define strerror PyMac_StrError
 #endif /* macintosh */

 #ifndef __STDC__
 #ifndef MS_WINDOWS
 extern char *strerror(int);
 #endif
 #endif

 #ifdef MS_WIN32
 #include "windows.h"
 #include "winbase.h"
 #endif

 void
 PyErr_Restore(type, value, traceback)
 	PyObject *type;
 	PyObject *value;
 	PyObject *traceback;
 {
 	PyThreadState *tstate = PyThreadState_GET();
 	PyObject *oldtype, *oldvalue, *oldtraceback;

 	if (traceback != NULL && !PyTraceBack_Check(traceback)) {
 		/* XXX Should never happen -- fatal error instead? */
 		Py_DECREF(traceback);
 		traceback = NULL;
 	}

 	/* Save these in locals to safeguard against recursive
 	   invocation through Py_XDECREF */
 	oldtype = tstate->curexc_type;
 	oldvalue = tstate->curexc_value;
 	oldtraceback = tstate->curexc_traceback;

 	tstate->curexc_type = type;
 	tstate->curexc_value = value;
 	tstate->curexc_traceback = traceback;

 	Py_XDECREF(oldtype);
 	Py_XDECREF(oldvalue);
 	Py_XDECREF(oldtraceback);
 }

 void
 PyErr_SetObject(exception, value)
 	PyObject *exception;
 	PyObject *value;
 {
 	Py_XINCREF(exception);
 	Py_XINCREF(value);
 	PyErr_Restore(exception, value, (PyObject *)NULL);
 }

 void
 PyErr_SetNone(exception)
 	PyObject *exception;
 {
 	PyErr_SetObject(exception, (PyObject *)NULL);
 }

 void
 PyErr_SetString(exception, string)
 	PyObject *exception;
 	const char *string;
 {
 	PyObject *value = PyString_FromString(string);
 	PyErr_SetObject(exception, value);
 	Py_XDECREF(value);
 }


 PyObject *
 PyErr_Occurred()
 {
 	PyThreadState *tstate = PyThreadState_Get();

 	return tstate->curexc_type;
 }


 int
 PyErr_GivenExceptionMatches(err, exc)
      PyObject *err, *exc;
 {
 	if (err == NULL || exc == NULL) {
 		/* maybe caused by "import exceptions" that failed early on */
 		return 0;
 	}
 	if (PyTuple_Check(exc)) {
 		int i, n;
 		n = PyTuple_Size(exc);
 		for (i = 0; i < n; i++) {
 			/* Test recursively */
 		     if (PyErr_GivenExceptionMatches(
 			     err, PyTuple_GET_ITEM(exc, i)))
 		     {
 			     return 1;
 		     }
 		}
 		return 0;
 	}
 	/* err might be an instance, so check its class. */
 	if (PyInstance_Check(err))
 		err = (PyObject*)((PyInstanceObject*)err)->in_class;

 	if (PyClass_Check(err) && PyClass_Check(exc))
 		return PyClass_IsSubclass(err, exc);

 	return err == exc;
 }


 int
 PyErr_ExceptionMatches(exc)
      PyObject *exc;
 {
 	return PyErr_GivenExceptionMatches(PyErr_Occurred(), exc);
 }


 /* Used in many places to normalize a raised exception, including in
    eval_code2(), do_raise(), and PyErr_Print()
 */
 void
 PyErr_NormalizeException(exc, val, tb)
      PyObject **exc;
      PyObject **val;
      PyObject **tb;
 {
 	PyObject *type = *exc;
 	PyObject *value = *val;
 	PyObject *inclass = NULL;

 	/* If PyErr_SetNone() was used, the value will have been actually
 	   set to NULL.
 	*/
 	if (!value) {
 		value = Py_None;
 		Py_INCREF(value);
 	}

 	if (PyInstance_Check(value))
 		inclass = (PyObject*)((PyInstanceObject*)value)->in_class;

 	/* Normalize the exception so that if the type is a class, the
 	   value will be an instance.
 	*/
 	if (PyClass_Check(type)) {
 		/* if the value was not an instance, or is not an instance
 		   whose class is (or is derived from) type, then use the
 		   value as an argument to instantiation of the type
 		   class.
 		*/
 		if (!inclass || !PyClass_IsSubclass(inclass, type)) {
 			PyObject *args, *res;

 			if (value == Py_None)
 				args = Py_BuildValue("()");
 			else if (PyTuple_Check(value)) {
 				Py_INCREF(value);
 				args = value;
 			}
 			else
 				args = Py_BuildValue("(O)", value);

 			if (args == NULL)
 				goto finally;
 			res = PyEval_CallObject(type, args);
 			Py_DECREF(args);
 			if (res == NULL)
 				goto finally;
 			Py_DECREF(value);
 			value = res;
 		}
 		/* if the class of the instance doesn't exactly match the
 		   class of the type, believe the instance
 		*/
 		else if (inclass != type) {
  			Py_DECREF(type);
 			type = inclass;
 			Py_INCREF(type);
 		}
 	}
 	*exc = type;
 	*val = value;
 	return;
 finally:
 	Py_DECREF(type);
 	Py_DECREF(value);
 	Py_XDECREF(*tb);
 	PyErr_Fetch(exc, val, tb);
 	/* normalize recursively */
 	PyErr_NormalizeException(exc, val, tb);
 }


 void
 PyErr_Fetch(p_type, p_value, p_traceback)
 	PyObject **p_type;
 	PyObject **p_value;
 	PyObject **p_traceback;
 {
 	PyThreadState *tstate = PyThreadState_Get();

 	*p_type = tstate->curexc_type;
 	*p_value = tstate->curexc_value;
 	*p_traceback = tstate->curexc_traceback;

 	tstate->curexc_type = NULL;
 	tstate->curexc_value = NULL;
 	tstate->curexc_traceback = NULL;
 }

 void
 PyErr_Clear()
 {
 	PyErr_Restore(NULL, NULL, NULL);
 }

 /* Convenience functions to set a type error exception and return 0 */

 int
 PyErr_BadArgument()
 {
 	PyErr_SetString(PyExc_TypeError,
 			"illegal argument type for built-in operation");
 	return 0;
 }

 PyObject *
 PyErr_NoMemory()
 {
 	/* raise the pre-allocated instance if it still exists */
 	if (PyExc_MemoryErrorInst)
 		PyErr_SetObject(PyExc_MemoryError, PyExc_MemoryErrorInst);
 	else
 		/* this will probably fail since there's no memory and hee,
 		   hee, we have to instantiate this class
 		*/
 		PyErr_SetNone(PyExc_MemoryError);

 	return NULL;
 }

 PyObject *
 PyErr_SetFromErrnoWithFilename(exc, filename)
 	PyObject *exc;
 	char *filename;
 {
 	PyObject *v;
 	char *s;
 	int i = errno;
 #ifdef MS_WIN32
 	char *s_buf = NULL;
 #endif
 #ifdef EINTR
 	if (i == EINTR && PyErr_CheckSignals())
 		return NULL;
 #endif
 	if (i == 0)
 		s = "Error"; /* Sometimes errno didn't get set */
 	else
 #ifndef MS_WIN32
 		s = strerror(i);
 #else
 	{
 		/* Note that the Win32 errors do not lineup with the
 		   errno error.  So if the error is in the MSVC error
 		   table, we use it, otherwise we assume it really _is_
 		   a Win32 error code
 		*/
 		if (i > 0 && i < _sys_nerr) {
 			s = _sys_errlist[i];
 		}
 		else {
 			int len = FormatMessage(
 				FORMAT_MESSAGE_ALLOCATE_BUFFER |
 				FORMAT_MESSAGE_FROM_SYSTEM |
 				FORMAT_MESSAGE_IGNORE_INSERTS,
 				NULL,	/* no message source */
 				i,
 				MAKELANGID(LANG_NEUTRAL,
 					   SUBLANG_DEFAULT),
 				           /* Default language */
 				(LPTSTR) &s_buf,
 				0,	/* size not used */
 				NULL);	/* no args */
 			s = s_buf;
 			/* remove trailing cr/lf and dots */
 			while (len > 0 && (s[len-1] <= ' ' || s[len-1] == '.'))
 				s[--len] = '\0';
 		}
 	}
 #endif
 	if (filename != NULL)
 		v = Py_BuildValue("(iss)", i, s, filename);
 	else
 		v = Py_BuildValue("(is)", i, s);
 	if (v != NULL) {
 		PyErr_SetObject(exc, v);
 		Py_DECREF(v);
 	}
 #ifdef MS_WIN32
 	LocalFree(s_buf);
 #endif
 	return NULL;
 }


 PyObject *
 PyErr_SetFromErrno(exc)
 	PyObject *exc;
 {
 	return PyErr_SetFromErrnoWithFilename(exc, NULL);
 }

 #ifdef MS_WINDOWS
 /* Windows specific error code handling */
 PyObject *PyErr_SetFromWindowsErrWithFilename(
 	int ierr,
 	const char *filename)
 {
 	int len;
 	char *s;
 	PyObject *v;
 	DWORD err = (DWORD)ierr;
 	if (err==0) err = GetLastError();
 	len = FormatMessage(
 		/* Error API error */
 		FORMAT_MESSAGE_ALLOCATE_BUFFER |
 		FORMAT_MESSAGE_FROM_SYSTEM |
 		FORMAT_MESSAGE_IGNORE_INSERTS,
 		NULL,	/* no message source */
 		err,
 		MAKELANGID(LANG_NEUTRAL,
 		SUBLANG_DEFAULT), /* Default language */
 		(LPTSTR) &s,
 		0,	/* size not used */
 		NULL);	/* no args */
 	/* remove trailing cr/lf and dots */
 	while (len > 0 && (s[len-1] <= ' ' || s[len-1] == '.'))
 		s[--len] = '\0';
 	if (filename != NULL)
 		v = Py_BuildValue("(iss)", err, s, filename);
 	else
 		v = Py_BuildValue("(is)", err, s);
 	if (v != NULL) {
 		PyErr_SetObject(PyExc_WindowsError, v);
 		Py_DECREF(v);
 	}
 	LocalFree(s);
 	return NULL;
 }

 PyObject *PyErr_SetFromWindowsErr(int ierr)
 {
 	return PyErr_SetFromWindowsErrWithFilename(ierr, NULL);

 }
 #endif /* MS_WINDOWS */

 void
 PyErr_BadInternalCall()
 {
 	PyErr_SetString(PyExc_SystemError,
 			"bad argument to internal function");
 }


 #ifdef HAVE_STDARG_PROTOTYPES
 PyObject *
 PyErr_Format(PyObject *exception, const char *format, ...)
 #else
 PyObject *
 PyErr_Format(exception, format, va_alist)
 	PyObject *exception;
 	const char *format;
 	va_dcl
 #endif
 {
 	va_list vargs;
 	char buffer[500]; /* Caller is responsible for limiting the format */

 #ifdef HAVE_STDARG_PROTOTYPES
 	va_start(vargs, format);
 #else
 	va_start(vargs);
 #endif

 	vsprintf(buffer, format, vargs);
 	PyErr_SetString(exception, buffer);
 	return NULL;
 }


 PyObject *
 PyErr_NewException(name, base, dict)
 	char *name; /* modulename.classname */
 	PyObject *base;
 	PyObject *dict;
 {
 	char *dot;
 	PyObject *modulename = NULL;
 	PyObject *classname = NULL;
 	PyObject *mydict = NULL;
 	PyObject *bases = NULL;
 	PyObject *result = NULL;
 	dot = strrchr(name, '.');
 	if (dot == NULL) {
 		PyErr_SetString(PyExc_SystemError,
 			"PyErr_NewException: name must be module.class");
 		return NULL;
 	}
 	if (base == NULL)
 		base = PyExc_Exception;
 	if (!PyClass_Check(base)) {
 		/* Must be using string-based standard exceptions (-X) */
 		return PyString_FromString(name);
 	}
 	if (dict == NULL) {
 		dict = mydict = PyDict_New();
 		if (dict == NULL)
 			goto failure;
 	}
 	if (PyDict_GetItemString(dict, "__module__") == NULL) {
 		modulename = PyString_FromStringAndSize(name, (int)(dot-name));
 		if (modulename == NULL)
 			goto failure;
 		if (PyDict_SetItemString(dict, "__module__", modulename) != 0)
 			goto failure;
 	}
 	classname = PyString_FromString(dot+1);
 	if (classname == NULL)
 		goto failure;
 	bases = Py_BuildValue("(O)", base);
 	if (bases == NULL)
 		goto failure;
 	result = PyClass_New(bases, dict, classname);
   failure:
 	Py_XDECREF(bases);
 	Py_XDECREF(mydict);
 	Py_XDECREF(classname);
 	Py_XDECREF(modulename);
 	return result;
 }
	/***********************************************************
	Copyright (c) 2000, BeOpen.com.
	Copyright (c) 1995-2000, Corporation for National Research Initiatives.
	Copyright (c) 1990-1995, Stichting Mathematisch Centrum.
	All rights reserved.

	See the file "Misc/COPYRIGHT" for information on usage and
	redistribution of this file, and for a DISCLAIMER OF ALL WARRANTIES.
	******************************************************************/

	/* Error handling */

	#include "Python.h"

	#ifdef SYMANTEC__CFM68K__
	#pragma lib_export on
	#endif

	#ifdef macintosh
	extern char *PyMac_StrError(int);
	#undef strerror
	#define strerror PyMac_StrError
	#endif /* macintosh */

	#ifndef __STDC__
	#ifndef MS_WINDOWS
	extern char *strerror(int);
	#endif
	#endif

	#ifdef MS_WIN32
	#include "windows.h"
	#include "winbase.h"
	#endif

	void
	PyErr_Restore(type, value, traceback)
	PyObject *type;
	PyObject *value;
	PyObject *traceback;
	{
	PyThreadState *tstate = PyThreadState_GET();
	PyObject oldtype, oldvalue, *oldtraceback;

	if (traceback != NULL && !PyTraceBack_Check(traceback)) {
	/* XXX Should never happen -- fatal error instead? */
	Py_DECREF(traceback);
	traceback = NULL;
	}

	/* Save these in locals to safeguard against recursive
	invocation through Py_XDECREF */
	oldtype = tstate->curexc_type;
	oldvalue = tstate->curexc_value;
	oldtraceback = tstate->curexc_traceback;

	tstate->curexc_type = type;
	tstate->curexc_value = value;
	tstate->curexc_traceback = traceback;

	Py_XDECREF(oldtype);
	Py_XDECREF(oldvalue);
	Py_XDECREF(oldtraceback);
	}

	void
	PyErr_SetObject(exception, value)
	PyObject *exception;
	PyObject *value;
	{
	Py_XINCREF(exception);
	Py_XINCREF(value);
	PyErr_Restore(exception, value, (PyObject *)NULL);
	}

	void
	PyErr_SetNone(exception)
	PyObject *exception;
	{
	PyErr_SetObject(exception, (PyObject *)NULL);
	}

	void
	PyErr_SetString(exception, string)
	PyObject *exception;
	const char *string;
	{
	PyObject *value = PyString_FromString(string);
	PyErr_SetObject(exception, value);
	Py_XDECREF(value);
	}


	PyObject *
	PyErr_Occurred()
	{
	PyThreadState *tstate = PyThreadState_Get();

	return tstate->curexc_type;
	}


	int
	PyErr_GivenExceptionMatches(err, exc)
	PyObject err, exc;
	{
	if (err == NULL \|\| exc == NULL) {
	/* maybe caused by "import exceptions" that failed early on */
	return 0;
	}
	if (PyTuple_Check(exc)) {
	int i, n;
	n = PyTuple_Size(exc);
	for (i = 0; i < n; i++) {
	/* Test recursively */
	if (PyErr_GivenExceptionMatches(
	err, PyTuple_GET_ITEM(exc, i)))
	{
	return 1;
	}
	}
	return 0;
	}
	/* err might be an instance, so check its class. */
	if (PyInstance_Check(err))
	err = (PyObject)((PyInstanceObject)err)->in_class;

	if (PyClass_Check(err) && PyClass_Check(exc))
	return PyClass_IsSubclass(err, exc);

	return err == exc;
	}


	int
	PyErr_ExceptionMatches(exc)
	PyObject *exc;
	{
	return PyErr_GivenExceptionMatches(PyErr_Occurred(), exc);
	}


	/* Used in many places to normalize a raised exception, including in
	eval_code2(), do_raise(), and PyErr_Print()
	*/
	void
	PyErr_NormalizeException(exc, val, tb)
	PyObject **exc;
	PyObject **val;
	PyObject **tb;
	{
	PyObject type = exc;
	PyObject value = val;
	PyObject *inclass = NULL;

	/* If PyErr_SetNone() was used, the value will have been actually
	set to NULL.
	*/
	if (!value) {
	value = Py_None;
	Py_INCREF(value);
	}

	if (PyInstance_Check(value))
	inclass = (PyObject)((PyInstanceObject)value)->in_class;

	/* Normalize the exception so that if the type is a class, the
	value will be an instance.
	*/
	if (PyClass_Check(type)) {
	/* if the value was not an instance, or is not an instance
	whose class is (or is derived from) type, then use the
	value as an argument to instantiation of the type
	class.
	*/
	if (!inclass \|\| !PyClass_IsSubclass(inclass, type)) {
	PyObject args, res;

	if (value == Py_None)
	args = Py_BuildValue("()");
	else if (PyTuple_Check(value)) {
	Py_INCREF(value);
	args = value;
	}
	else
	args = Py_BuildValue("(O)", value);

	if (args == NULL)
	goto finally;
	res = PyEval_CallObject(type, args);
	Py_DECREF(args);
	if (res == NULL)
	goto finally;
	Py_DECREF(value);
	value = res;
	}
	/* if the class of the instance doesn't exactly match the
	class of the type, believe the instance
	*/
	else if (inclass != type) {
	Py_DECREF(type);
	type = inclass;
	Py_INCREF(type);
	}
	}
	*exc = type;
	*val = value;
	return;
	finally:
	Py_DECREF(type);
	Py_DECREF(value);
	Py_XDECREF(*tb);
	PyErr_Fetch(exc, val, tb);
	/* normalize recursively */
	PyErr_NormalizeException(exc, val, tb);
	}


	void
	PyErr_Fetch(p_type, p_value, p_traceback)
	PyObject **p_type;
	PyObject **p_value;
	PyObject **p_traceback;
	{
	PyThreadState *tstate = PyThreadState_Get();

	*p_type = tstate->curexc_type;
	*p_value = tstate->curexc_value;
	*p_traceback = tstate->curexc_traceback;

	tstate->curexc_type = NULL;
	tstate->curexc_value = NULL;
	tstate->curexc_traceback = NULL;
	}

	void
	PyErr_Clear()
	{
	PyErr_Restore(NULL, NULL, NULL);
	}

	/* Convenience functions to set a type error exception and return 0 */

	int
	PyErr_BadArgument()
	{
	PyErr_SetString(PyExc_TypeError,
	"illegal argument type for built-in operation");
	return 0;
	}

	PyObject *
	PyErr_NoMemory()
	{
	/* raise the pre-allocated instance if it still exists */
	if (PyExc_MemoryErrorInst)
	PyErr_SetObject(PyExc_MemoryError, PyExc_MemoryErrorInst);
	else
	/* this will probably fail since there's no memory and hee,
	hee, we have to instantiate this class
	*/
	PyErr_SetNone(PyExc_MemoryError);

	return NULL;
	}

	PyObject *
	PyErr_SetFromErrnoWithFilename(exc, filename)
	PyObject *exc;
	char *filename;
	{
	PyObject *v;
	char *s;
	int i = errno;
	#ifdef MS_WIN32
	char *s_buf = NULL;
	#endif
	#ifdef EINTR
	if (i == EINTR && PyErr_CheckSignals())
	return NULL;
	#endif
	if (i == 0)
	s = "Error"; /* Sometimes errno didn't get set */
	else
	#ifndef MS_WIN32
	s = strerror(i);
	#else
	{
	/* Note that the Win32 errors do not lineup with the
	errno error. So if the error is in the MSVC error
	table, we use it, otherwise we assume it really _is_
	a Win32 error code
	*/
	if (i > 0 && i < _sys_nerr) {
	s = _sys_errlist[i];
	}
	else {
	int len = FormatMessage(
	FORMAT_MESSAGE_ALLOCATE_BUFFER \|
	FORMAT_MESSAGE_FROM_SYSTEM \|
	FORMAT_MESSAGE_IGNORE_INSERTS,
	NULL, /* no message source */
	i,
	MAKELANGID(LANG_NEUTRAL,
	SUBLANG_DEFAULT),
	/* Default language */
	(LPTSTR) &s_buf,
	0, /* size not used */
	NULL); /* no args */
	s = s_buf;
	/* remove trailing cr/lf and dots */
	while (len > 0 && (s[len-1] <= ' ' \|\| s[len-1] == '.'))
	s[--len] = '\0';
	}
	}
	#endif
	if (filename != NULL)
	v = Py_BuildValue("(iss)", i, s, filename);
	else
	v = Py_BuildValue("(is)", i, s);
	if (v != NULL) {
	PyErr_SetObject(exc, v);
	Py_DECREF(v);
	}
	#ifdef MS_WIN32
	LocalFree(s_buf);
	#endif
	return NULL;
	}


	PyObject *
	PyErr_SetFromErrno(exc)
	PyObject *exc;
	{
	return PyErr_SetFromErrnoWithFilename(exc, NULL);
	}

	#ifdef MS_WINDOWS
	/* Windows specific error code handling */
	PyObject *PyErr_SetFromWindowsErrWithFilename(
	int ierr,
	const char *filename)
	{
	int len;
	char *s;
	PyObject *v;
	DWORD err = (DWORD)ierr;
	if (err==0) err = GetLastError();
	len = FormatMessage(
	/* Error API error */
	FORMAT_MESSAGE_ALLOCATE_BUFFER \|
	FORMAT_MESSAGE_FROM_SYSTEM \|
	FORMAT_MESSAGE_IGNORE_INSERTS,
	NULL, /* no message source */
	err,
	MAKELANGID(LANG_NEUTRAL,
	SUBLANG_DEFAULT), /* Default language */
	(LPTSTR) &s,
	0, /* size not used */
	NULL); /* no args */
	/* remove trailing cr/lf and dots */
	while (len > 0 && (s[len-1] <= ' ' \|\| s[len-1] == '.'))
	s[--len] = '\0';
	if (filename != NULL)
	v = Py_BuildValue("(iss)", err, s, filename);
	else
	v = Py_BuildValue("(is)", err, s);
	if (v != NULL) {
	PyErr_SetObject(PyExc_WindowsError, v);
	Py_DECREF(v);
	}
	LocalFree(s);
	return NULL;
	}

	PyObject *PyErr_SetFromWindowsErr(int ierr)
	{
	return PyErr_SetFromWindowsErrWithFilename(ierr, NULL);

	}
	#endif /* MS_WINDOWS */

	void
	PyErr_BadInternalCall()
	{
	PyErr_SetString(PyExc_SystemError,
	"bad argument to internal function");
	}


	#ifdef HAVE_STDARG_PROTOTYPES
	PyObject *
	PyErr_Format(PyObject exception, const char format, ...)
	#else
	PyObject *
	PyErr_Format(exception, format, va_alist)
	PyObject *exception;
	const char *format;
	va_dcl
	#endif
	{
	va_list vargs;
	char buffer[500]; /* Caller is responsible for limiting the format */

	#ifdef HAVE_STDARG_PROTOTYPES
	va_start(vargs, format);
	#else
	va_start(vargs);
	#endif

	vsprintf(buffer, format, vargs);
	PyErr_SetString(exception, buffer);
	return NULL;
	}


	PyObject *
	PyErr_NewException(name, base, dict)
	char name; / modulename.classname */
	PyObject *base;
	PyObject *dict;
	{
	char *dot;
	PyObject *modulename = NULL;
	PyObject *classname = NULL;
	PyObject *mydict = NULL;
	PyObject *bases = NULL;
	PyObject *result = NULL;
	dot = strrchr(name, '.');
	if (dot == NULL) {
	PyErr_SetString(PyExc_SystemError,
	"PyErr_NewException: name must be module.class");
	return NULL;
	}
	if (base == NULL)
	base = PyExc_Exception;
	if (!PyClass_Check(base)) {
	/* Must be using string-based standard exceptions (-X) */
	return PyString_FromString(name);
	}
	if (dict == NULL) {
	dict = mydict = PyDict_New();
	if (dict == NULL)
	goto failure;
	}
	if (PyDict_GetItemString(dict, "__module__") == NULL) {
	modulename = PyString_FromStringAndSize(name, (int)(dot-name));
	if (modulename == NULL)
	goto failure;
	if (PyDict_SetItemString(dict, "__module__", modulename) != 0)
	goto failure;
	}
	classname = PyString_FromString(dot+1);
	if (classname == NULL)
	goto failure;
	bases = Py_BuildValue("(O)", base);
	if (bases == NULL)
	goto failure;
	result = PyClass_New(bases, dict, classname);
	failure:
	Py_XDECREF(bases);
	Py_XDECREF(mydict);
	Py_XDECREF(classname);
	Py_XDECREF(modulename);
	return result;
	}