/* Error handling */

#include "Python.h"

#ifndef __STDC__

#ifndef MS_WINDOWS

extern char *strerror(int);

#endif

#endif

#ifdef MS_WINDOWS

#include "windows.h"

#include "winbase.h"

#endif

#include <ctype.h>

#ifdef __cplusplus

extern "C" {

#endif

void

PyErr_Restore(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? */

		/* Well, it could be None. */

		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(PyObject *exception, PyObject *value)

{

	Py_XINCREF(exception);

	Py_XINCREF(value);

	PyErr_Restore(exception, value, (PyObject *)NULL);

}

void

PyErr_SetNone(PyObject *exception)

{

	PyErr_SetObject(exception, (PyObject *)NULL);

}

void

PyErr_SetString(PyObject *exception, const char *string)

{

	PyObject *value = PyString_FromString(string);

	PyErr_SetObject(exception, value);

	Py_XDECREF(value);

}

PyObject *

PyErr_Occurred(void)

{

	PyThreadState *tstate = PyThreadState_GET();

	return tstate->curexc_type;

}

int

PyErr_GivenExceptionMatches(PyObject *err, PyObject *exc)

{

	if (err == NULL || exc == NULL) {

		/* maybe caused by "import exceptions" that failed early on */

		return 0;

	}

	if (PyTuple_Check(exc)) {

		Py_ssize_t 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 (PyExceptionInstance_Check(err))

		err = PyExceptionInstance_Class(err);

	if (PyExceptionClass_Check(err) && PyExceptionClass_Check(exc)) {

		int res = 0;

		PyObject *exception, *value, *tb;

		PyErr_Fetch(&exception, &value, &tb);

		res = PyObject_IsSubclass(err, exc);

		/* This function must not fail, so print the error here */

		if (res == -1) {

			PyErr_WriteUnraisable(err);

			res = 0;

		}

		PyErr_Restore(exception, value, tb);

		return res;

	}

	return err == exc;

}

int

PyErr_ExceptionMatches(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(PyObject **exc, PyObject **val, PyObject **tb)

{

	PyObject *type = *exc;

	PyObject *value = *val;

	PyObject *inclass = NULL;

	PyObject *initial_tb = NULL;

	PyThreadState *tstate = NULL;

	if (type == NULL) {

		/* There was no exception, so nothing to do. */

		return;

	}

	/* If PyErr_SetNone() was used, the value will have been actually

	   set to NULL.

	*/

	if (!value) {

		value = Py_None;

		Py_INCREF(value);

	}

	if (PyExceptionInstance_Check(value))

		inclass = PyExceptionInstance_Class(value);

	/* Normalize the exception so that if the type is a class, the

	   value will be an instance.

	*/

	if (PyExceptionClass_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 || !PyObject_IsSubclass(inclass, type)) {

			PyObject *args, *res;

			if (value == Py_None)

				args = PyTuple_New(0);

			else if (PyTuple_Check(value)) {

				Py_INCREF(value);

				args = value;

			}

			else

				args = PyTuple_Pack(1, 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);

	/* If the new exception doesn't set a traceback and the old

	   exception had a traceback, use the old traceback for the

	   new exception.  It's better than nothing.

	*/

	initial_tb = *tb;

	PyErr_Fetch(exc, val, tb);

	if (initial_tb != NULL) {

		if (*tb == NULL)

			*tb = initial_tb;

		else

			Py_DECREF(initial_tb);

	}

	/* normalize recursively */

	tstate = PyThreadState_GET();

	if (++tstate->recursion_depth > Py_GetRecursionLimit()) {

	    --tstate->recursion_depth;

	    PyErr_SetObject(PyExc_RuntimeError, PyExc_RecursionErrorInst);

	    return;

	}

	PyErr_NormalizeException(exc, val, tb);

	--tstate->recursion_depth;

}

void

PyErr_Fetch(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(void)

{

	PyErr_Restore(NULL, NULL, NULL);

}

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

int

PyErr_BadArgument(void)

{

	PyErr_SetString(PyExc_TypeError,

			"bad argument type for built-in operation");

	return 0;

}

PyObject *

PyErr_NoMemory(void)

{

	if (PyErr_ExceptionMatches(PyExc_MemoryError))

		/* already current */

		return NULL;

	/* 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_SetFromErrnoWithFilenameObject(PyObject *exc, PyObject *filenameObject)

{

	PyObject *v;

	char *s;

	int i = errno;

#ifdef PLAN9

	char errbuf[ERRMAX];

#endif

#ifdef MS_WINDOWS

	char *s_buf = NULL;

	char s_small_buf[28]; /* Room for "Windows Error 0xFFFFFFFF" */

#endif

#ifdef EINTR

	if (i == EINTR && PyErr_CheckSignals())

		return NULL;

#endif

#ifdef PLAN9

	rerrstr(errbuf, sizeof errbuf);

	s = errbuf;

#else

	if (i == 0)

		s = "Error"; /* Sometimes errno didn't get set */

	else

#ifndef MS_WINDOWS

		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 */

			if (len==0) {

				/* Only ever seen this in out-of-mem

				   situations */

				sprintf(s_small_buf, "Windows Error 0x%X", i);

				s = s_small_buf;

				s_buf = NULL;

			} else {

				s = s_buf;

				/* remove trailing cr/lf and dots */

				while (len > 0 && (s[len-1] <= ' ' || s[len-1] == '.'))

					s[--len] = '\0';

			}

		}

	}

#endif /* Unix/Windows */

#endif /* PLAN 9*/

	if (filenameObject != NULL)

		v = Py_BuildValue("(isO)", i, s, filenameObject);

	else

		v = Py_BuildValue("(is)", i, s);

	if (v != NULL) {

		PyErr_SetObject(exc, v);

		Py_DECREF(v);

	}

#ifdef MS_WINDOWS

	LocalFree(s_buf);

#endif

	return NULL;

}

PyObject *

PyErr_SetFromErrnoWithFilename(PyObject *exc, char *filename)

{

	PyObject *name = filename ? PyString_FromString(filename) : NULL;

	PyObject *result = PyErr_SetFromErrnoWithFilenameObject(exc, name);

	Py_XDECREF(name);

	return result;

}

#ifdef Py_WIN_WIDE_FILENAMES

PyObject *

PyErr_SetFromErrnoWithUnicodeFilename(PyObject *exc, Py_UNICODE *filename)

{

	PyObject *name = filename ?

	                 PyUnicode_FromUnicode(filename, wcslen(filename)) :

	                 NULL;

	PyObject *result = PyErr_SetFromErrnoWithFilenameObject(exc, name);

	Py_XDECREF(name);

	return result;

}

#endif /* Py_WIN_WIDE_FILENAMES */

PyObject *

PyErr_SetFromErrno(PyObject *exc)

{

	return PyErr_SetFromErrnoWithFilenameObject(exc, NULL);

}

#ifdef MS_WINDOWS

/* Windows specific error code handling */

PyObject *PyErr_SetExcFromWindowsErrWithFilenameObject(

	PyObject *exc,

	int ierr,

	PyObject *filenameObject)

{

	int len;

	char *s;

	char *s_buf = NULL; /* Free via LocalFree */

	char s_small_buf[28]; /* Room for "Windows Error 0xFFFFFFFF" */

	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_buf,

		0,	/* size not used */

		NULL);	/* no args */

	if (len==0) {

		/* Only seen this in out of mem situations */

		sprintf(s_small_buf, "Windows Error 0x%X", err);

		s = s_small_buf;

		s_buf = NULL;

	} else {

		s = s_buf;

		/* remove trailing cr/lf and dots */

		while (len > 0 && (s[len-1] <= ' ' || s[len-1] == '.'))

			s[--len] = '\0';

	}

	if (filenameObject != NULL)

		v = Py_BuildValue("(isO)", err, s, filenameObject);

	else

		v = Py_BuildValue("(is)", err, s);

	if (v != NULL) {

		PyErr_SetObject(exc, v);

		Py_DECREF(v);

	}

	LocalFree(s_buf);

	return NULL;

}

PyObject *PyErr_SetExcFromWindowsErrWithFilename(

	PyObject *exc,

	int ierr,

	const char *filename)

{

	PyObject *name = filename ? PyString_FromString(filename) : NULL;

	PyObject *ret = PyErr_SetExcFromWindowsErrWithFilenameObject(exc,

	                                                             ierr,

	                                                             name);

	Py_XDECREF(name);

	return ret;

}

#ifdef Py_WIN_WIDE_FILENAMES

PyObject *PyErr_SetExcFromWindowsErrWithUnicodeFilename(

	PyObject *exc,

	int ierr,

	const Py_UNICODE *filename)

{

	PyObject *name = filename ?

	                 PyUnicode_FromUnicode(filename, wcslen(filename)) :

	                 NULL;

	PyObject *ret = PyErr_SetExcFromWindowsErrWithFilenameObject(exc,

	                                                             ierr,

	                                                             name);

	Py_XDECREF(name);

	return ret;

}

#endif /* Py_WIN_WIDE_FILENAMES */

PyObject *PyErr_SetExcFromWindowsErr(PyObject *exc, int ierr)

{

	return PyErr_SetExcFromWindowsErrWithFilename(exc, ierr, NULL);

}

PyObject *PyErr_SetFromWindowsErr(int ierr)

{

	return PyErr_SetExcFromWindowsErrWithFilename(PyExc_WindowsError,

						      ierr, NULL);

}

PyObject *PyErr_SetFromWindowsErrWithFilename(

	int ierr,

	const char *filename)

{

	PyObject *name = filename ? PyString_FromString(filename) : NULL;

	PyObject *result = PyErr_SetExcFromWindowsErrWithFilenameObject(

						      PyExc_WindowsError,

						      ierr, name);

	Py_XDECREF(name);

	return result;

}

#ifdef Py_WIN_WIDE_FILENAMES

PyObject *PyErr_SetFromWindowsErrWithUnicodeFilename(

	int ierr,

	const Py_UNICODE *filename)

{

	PyObject *name = filename ?

	                 PyUnicode_FromUnicode(filename, wcslen(filename)) :

	                 NULL;

	PyObject *result = PyErr_SetExcFromWindowsErrWithFilenameObject(

						      PyExc_WindowsError,

						      ierr, name);

	Py_XDECREF(name);

	return result;

}

#endif /* Py_WIN_WIDE_FILENAMES */

#endif /* MS_WINDOWS */

void

_PyErr_BadInternalCall(char *filename, int lineno)

{

	PyErr_Format(PyExc_SystemError,

		     "%s:%d: bad argument to internal function",

		     filename, lineno);

}

/* Remove the preprocessor macro for PyErr_BadInternalCall() so that we can

   export the entry point for existing object code: */

#undef PyErr_BadInternalCall

void

PyErr_BadInternalCall(void)

{

	PyErr_Format(PyExc_SystemError,

		     "bad argument to internal function");

}

#define PyErr_BadInternalCall() _PyErr_BadInternalCall(__FILE__, __LINE__)

PyObject *

PyErr_Format(PyObject *exception, const char *format, ...)

{