/* Error handling */

#include "Python.h"

#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_WINDOWS

#include "windows.h"

#include "winbase.h"

#endif

#include <ctype.h>

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? */

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)) {

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(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;

if (type == NULL) {

/* This is a bug. Should never happen. Don't dump core. */

PyErr_SetString(PyExc_SystemError,

"PyErr_NormalizeException() called without exception");

}

/* 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);

/* 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 */

PyErr_NormalizeException(exc, val, tb);

}

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_SetFromErrnoWithFilename(PyObject *exc, char *filename)

{

PyObject *v;

char *s;

int i = errno;

#ifdef PLAN9

char errbuf[ERRMAX];

#endif

#ifdef MS_WINDOWS

char *s_buf = NULL;

#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 */

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 (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_WINDOWS

LocalFree(s_buf);

#endif

return NULL;

}

PyObject *

PyErr_SetFromErrno(PyObject *exc)

{

return PyErr_SetFromErrnoWithFilename(exc, NULL);

}

#ifdef MS_WINDOWS

/* Windows specific error code handling */

PyObject *PyErr_SetExcFromWindowsErrWithFilename(

PyObject *exc,

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(exc, v);

Py_DECREF(v);

}

LocalFree(s);

return NULL;

}

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)

{

return PyErr_SetExcFromWindowsErrWithFilename(PyExc_WindowsError,

ierr, filename);

}

#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, ...)

{

va_list vargs;

PyObject* string;

#ifdef HAVE_STDARG_PROTOTYPES

va_start(vargs, format);

#else

va_start(vargs);

#endif

string = PyString_FromFormatV(format, vargs);

PyErr_SetObject(exception, string);

Py_XDECREF(string);

va_end(vargs);

return NULL;

}

PyObject *

PyErr_NewException(char *name, 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;

}

/* Call when an exception has occurred but there is no way for Python

to handle it. Examples: exception in __del__ or during GC. */

void

PyErr_WriteUnraisable(PyObject *obj)

{

PyObject *f, *t, *v, *tb;

PyErr_Fetch(&t, &v, &tb);

f = PySys_GetObject("stderr");

if (f != NULL) {

PyFile_WriteString("Exception ", f);

if (t) {

PyFile_WriteObject(t, f, Py_PRINT_RAW);

if (v && v != Py_None) {

PyFile_WriteString(": ", f);

PyFile_WriteObject(v, f, 0);

}

}

PyFile_WriteString(" in ", f);

PyFile_WriteObject(obj, f, 0);

PyFile_WriteString(" ignored\n", f);

PyErr_Clear(); /* Just in case */

}

Py_XDECREF(t);

Py_XDECREF(v);

Py_XDECREF(tb);

}

/* Function to issue a warning message; may raise an exception. */

int

PyErr_Warn(PyObject *category, char *message)

{

PyObject *mod, *dict, *func = NULL;

mod = PyImport_ImportModule("warnings");

if (mod != NULL) {

dict = PyModule_GetDict(mod);

func = PyDict_GetItemString(dict, "warn");

Py_DECREF(mod);

}

if (func == NULL) {

PySys_WriteStderr("warning: %s\n", message);

return 0;

}

else {

PyObject *args, *res;

if (category == NULL)

category = PyExc_RuntimeWarning;

args = Py_BuildValue("(sO)", message, category);

if (args == NULL)

return -1;

res = PyEval_CallObject(func, args);

Py_DECREF(args);

if (res == NULL)

return -1;

Py_DECREF(res);

return 0;

}

}

/* Warning with explicit origin */

int

PyErr_WarnExplicit(PyObject *category, char *message,

char *filename, int lineno,

char *module, PyObject *registry)

{

PyObject *mod, *dict, *func = NULL;

mod = PyImport_ImportModule("warnings");

if (mod != NULL) {

dict = PyModule_GetDict(mod);

func = PyDict_GetItemString(dict, "warn_explicit");

Py_DECREF(mod);

}

if (func == NULL) {

PySys_WriteStderr("warning: %s\n", message);

return 0;

}

else {

PyObject *args, *res;

if (category == NULL)

category = PyExc_RuntimeWarning;

if (registry == NULL)

registry = Py_None;

args = Py_BuildValue("(sOsizO)", message, category,

filename, lineno, module, registry);

if (args == NULL)

return -1;

res = PyEval_CallObject(func, args);

Py_DECREF(args);

if (res == NULL)

return -1;

Py_DECREF(res);

return 0;

}

}

/* Set file and line information for the current exception.

If the exception is not a SyntaxError, also sets additional attributes

to make printing of exceptions believe it is a syntax error. */

void

PyErr_SyntaxLocation(char *filename, int lineno)

{

PyObject *exc, *v, *tb, *tmp;

/* add attributes for the line number and filename for the error */

PyErr_Fetch(&exc, &v, &tb);

PyErr_NormalizeException(&exc, &v, &tb);

/* XXX check that it is, indeed, a syntax error */

tmp = PyInt_FromLong(lineno);

if (tmp == NULL)

PyErr_Clear();

else {

if (PyObject_SetAttrString(v, "lineno", tmp))

PyErr_Clear();

Py_DECREF(tmp);

}

if (filename != NULL) {

tmp = PyString_FromString(filename);

if (tmp == NULL)

PyErr_Clear();

else {

if (PyObject_SetAttrString(v, "filename", tmp))

PyErr_Clear();

Py_DECREF(tmp);

}

tmp = PyErr_ProgramText(filename, lineno);

if (tmp) {

PyObject_SetAttrString(v, "text", tmp);

Py_DECREF(tmp);

}

}

if (PyObject_SetAttrString(v, "offset", Py_None)) {

PyErr_Clear();

}

if (exc != PyExc_SyntaxError) {

if (!PyObject_HasAttrString(v, "msg")) {

tmp = PyObject_Str(v);

if (tmp) {

if (PyObject_SetAttrString(v, "msg", tmp))

PyErr_Clear();

Py_DECREF(tmp);

} else {

PyErr_Clear();

}

}

if (!PyObject_HasAttrString(v, "print_file_and_line")) {

if (PyObject_SetAttrString(v, "print_file_and_line",

Py_None))

PyErr_Clear();

}

}

PyErr_Restore(exc, v, tb);

}

/* com_fetch_program_text will attempt to load the line of text that

the exception refers to. If it fails, it will return NULL but will

not set an exception.

XXX The functionality of this function is quite similar to the

functionality in tb_displayline() in traceback.c.

*/

PyObject *

PyErr_ProgramText(char *filename, int lineno)

{

FILE *fp;

int i;

char linebuf[1000];

if (filename == NULL || lineno <= 0)

return NULL;

fp = fopen(filename, "r" PY_STDIOTEXTMODE);

if (fp == NULL)

return NULL;

for (i = 0; i < lineno; i++) {

char *pLastChar = &linebuf[sizeof(linebuf) - 2];

do {

*pLastChar = '\0';

if (Py_UniversalNewlineFgets(linebuf, sizeof linebuf, fp, NULL) == NULL)

break;

/* fgets read *something*; if it didn't get as

far as pLastChar, it must have found a newline

or hit the end of the file; if pLastChar is \n,

it obviously found a newline; else we haven't

yet seen a newline, so must continue */

} while (*pLastChar != '\0' && *pLastChar != '\n');

}

fclose(fp);

if (i == lineno) {

char *p = linebuf;

while (*p == ' ' || *p == '\t' || *p == '\014')

p++;

return PyString_FromString(p);

}

return NULL;

}