/* Python interpreter top-level routines, including init/exit */

#include "Python.h"

#include "grammar.h"

#include "node.h"

#include "token.h"

#include "parsetok.h"

#include "errcode.h"

#include "compile.h"

#include "symtable.h"

#include "eval.h"

#include "marshal.h"

#ifdef HAVE_SIGNAL_H

#include <signal.h>

#endif

#ifdef MS_WIN32

#undef BYTE

#include "windows.h"

#endif

#ifdef macintosh

#include "macglue.h"

#endif

extern char *Py_GetPath(void);

extern grammar _PyParser_Grammar; /* From graminit.c */

/* Forward */

static void initmain(void);

static void initsite(void);

static PyObject *run_err_node(node *, char *, PyObject *, PyObject *,

PyCompilerFlags *);

static PyObject *run_node(node *, char *, PyObject *, PyObject *,

PyCompilerFlags *);

static PyObject *run_pyc_file(FILE *, char *, PyObject *, PyObject *,

PyCompilerFlags *);

static void err_input(perrdetail *);

static void initsigs(void);

static void call_sys_exitfunc(void);

static void call_ll_exitfuncs(void);

#ifdef Py_TRACE_REFS

int _Py_AskYesNo(char *prompt);

#endif

extern void _PyUnicode_Init(void);

extern void _PyUnicode_Fini(void);

extern void _PyCodecRegistry_Init(void);

extern void _PyCodecRegistry_Fini(void);

int Py_DebugFlag; /* Needed by parser.c */

int Py_VerboseFlag; /* Needed by import.c */

int Py_InteractiveFlag; /* Needed by Py_FdIsInteractive() below */

int Py_NoSiteFlag; /* Suppress 'import site' */

int Py_UseClassExceptionsFlag = 1; /* Needed by bltinmodule.c: deprecated */

int Py_FrozenFlag; /* Needed by getpath.c */

int Py_UnicodeFlag = 0; /* Needed by compile.c */

int Py_IgnoreEnvironmentFlag; /* e.g. PYTHONPATH, PYTHONHOME */

/* _XXX Py_QnewFlag should go away in 2.3. It's true iff -Qnew is passed,

on the command line, and is used in 2.2 by ceval.c to make all "/" divisions

true divisions (which they will be in 2.3). */

int _Py_QnewFlag = 0;

static int initialized = 0;

/* API to access the initialized flag -- useful for esoteric use */

int

Py_IsInitialized(void)

{

return initialized;

}

/* Global initializations. Can be undone by Py_Finalize(). Don't

call this twice without an intervening Py_Finalize() call. When

initializations fail, a fatal error is issued and the function does

not return. On return, the first thread and interpreter state have

been created.

Locking: you must hold the interpreter lock while calling this.

(If the lock has not yet been initialized, that's equivalent to

having the lock, but you cannot use multiple threads.)

*/

static int

add_flag(int flag, const char *envs)

{

int env = atoi(envs);

if (flag < env)

flag = env;

if (flag < 1)

flag = 1;

return flag;

}

void

Py_Initialize(void)

{

PyInterpreterState *interp;

PyThreadState *tstate;

PyObject *bimod, *sysmod;

char *p;

extern void _Py_ReadyTypes(void);

if (initialized)

return;

initialized = 1;

if ((p = Py_GETENV("PYTHONDEBUG")) && *p != '\0')

Py_DebugFlag = add_flag(Py_DebugFlag, p);

if ((p = Py_GETENV("PYTHONVERBOSE")) && *p != '\0')

Py_VerboseFlag = add_flag(Py_VerboseFlag, p);

if ((p = Py_GETENV("PYTHONOPTIMIZE")) && *p != '\0')

Py_OptimizeFlag = add_flag(Py_OptimizeFlag, p);

interp = PyInterpreterState_New();

if (interp == NULL)

Py_FatalError("Py_Initialize: can't make first interpreter");

tstate = PyThreadState_New(interp);

if (tstate == NULL)

Py_FatalError("Py_Initialize: can't make first thread");

(void) PyThreadState_Swap(tstate);

_Py_ReadyTypes();

interp->modules = PyDict_New();

if (interp->modules == NULL)

Py_FatalError("Py_Initialize: can't make modules dictionary");

/* Init codec registry */

_PyCodecRegistry_Init();

#ifdef Py_USING_UNICODE

/* Init Unicode implementation; relies on the codec registry */

_PyUnicode_Init();

#endif

bimod = _PyBuiltin_Init();

if (bimod == NULL)

Py_FatalError("Py_Initialize: can't initialize __builtin__");

interp->builtins = PyModule_GetDict(bimod);

Py_INCREF(interp->builtins);

sysmod = _PySys_Init();

if (sysmod == NULL)

Py_FatalError("Py_Initialize: can't initialize sys");

interp->sysdict = PyModule_GetDict(sysmod);

Py_INCREF(interp->sysdict);

_PyImport_FixupExtension("sys", "sys");

PySys_SetPath(Py_GetPath());

PyDict_SetItemString(interp->sysdict, "modules",

interp->modules);

_PyImport_Init();

/* initialize builtin exceptions */

_PyExc_Init();

_PyImport_FixupExtension("exceptions", "exceptions");

/* phase 2 of builtins */

_PyImport_FixupExtension("__builtin__", "__builtin__");

initsigs(); /* Signal handling stuff, including initintr() */

initmain(); /* Module __main__ */

if (!Py_NoSiteFlag)

initsite(); /* Module site */

}

#ifdef COUNT_ALLOCS

extern void dump_counts(void);

#endif

/* Undo the effect of Py_Initialize().

Beware: if multiple interpreter and/or thread states exist, these

are not wiped out; only the current thread and interpreter state

are deleted. But since everything else is deleted, those other

interpreter and thread states should no longer be used.

(XXX We should do better, e.g. wipe out all interpreters and

threads.)

Locking: as above.

*/

void

Py_Finalize(void)

{

PyInterpreterState *interp;

PyThreadState *tstate;

if (!initialized)

return;

/* The interpreter is still entirely intact at this point, and the

* exit funcs may be relying on that. In particular, if some thread

* or exit func is still waiting to do an import, the import machinery

* expects Py_IsInitialized() to return true. So don't say the

* interpreter is uninitialized until after the exit funcs have run.

* Note that Threading.py uses an exit func to do a join on all the

* threads created thru it, so this also protects pending imports in

* the threads created via Threading.

*/

call_sys_exitfunc();

initialized = 0;

/* Get current thread state and interpreter pointer */

tstate = PyThreadState_Get();

interp = tstate->interp;

/* Disable signal handling */

PyOS_FiniInterrupts();

/* Cleanup Codec registry */

_PyCodecRegistry_Fini();

/* Destroy all modules */

PyImport_Cleanup();

/* Destroy the database used by _PyImport_{Fixup,Find}Extension */

_PyImport_Fini();

/* Debugging stuff */

#ifdef COUNT_ALLOCS

dump_counts();

#endif

#ifdef Py_REF_DEBUG

fprintf(stderr, "[%ld refs]\n", _Py_RefTotal);

#endif

#ifdef Py_TRACE_REFS

if (Py_GETENV("PYTHONDUMPREFS")) {

_Py_PrintReferences(stderr);

}

#endif /* Py_TRACE_REFS */

/* Now we decref the exception classes. After this point nothing

can raise an exception. That's okay, because each Fini() method

below has been checked to make sure no exceptions are ever

raised.

*/

_PyExc_Fini();

/* Delete current thread */

PyInterpreterState_Clear(interp);

PyThreadState_Swap(NULL);

PyInterpreterState_Delete(interp);

PyMethod_Fini();

PyFrame_Fini();

PyCFunction_Fini();

PyTuple_Fini();

PyString_Fini();

PyInt_Fini();

PyFloat_Fini();

#ifdef Py_USING_UNICODE

/* Cleanup Unicode implementation */

_PyUnicode_Fini();

#endif

/* XXX Still allocated:

- various static ad-hoc pointers to interned strings

- int and float free list blocks

- whatever various modules and libraries allocate

*/

PyGrammar_RemoveAccelerators(&_PyParser_Grammar);

call_ll_exitfuncs();

#ifdef Py_TRACE_REFS

_Py_ResetReferences();

#endif /* Py_TRACE_REFS */

}

/* Create and initialize a new interpreter and thread, and return the

new thread. This requires that Py_Initialize() has been called

first.

Unsuccessful initialization yields a NULL pointer. Note that *no*

exception information is available even in this case -- the

exception information is held in the thread, and there is no

thread.

Locking: as above.

*/

PyThreadState *

Py_NewInterpreter(void)

{

PyInterpreterState *interp;

PyThreadState *tstate, *save_tstate;

PyObject *bimod, *sysmod;

if (!initialized)

Py_FatalError("Py_NewInterpreter: call Py_Initialize first");

interp = PyInterpreterState_New();

if (interp == NULL)

return NULL;

tstate = PyThreadState_New(interp);

if (tstate == NULL) {

PyInterpreterState_Delete(interp);

return NULL;

}

save_tstate = PyThreadState_Swap(tstate);

/* XXX The following is lax in error checking */

interp->modules = PyDict_New();

bimod = _PyImport_FindExtension("__builtin__", "__builtin__");

if (bimod != NULL) {

interp->builtins = PyModule_GetDict(bimod);

Py_INCREF(interp->builtins);

}

sysmod = _PyImport_FindExtension("sys", "sys");

if (bimod != NULL && sysmod != NULL) {

interp->sysdict = PyModule_GetDict(sysmod);

Py_INCREF(interp->sysdict);

PySys_SetPath(Py_GetPath());

PyDict_SetItemString(interp->sysdict, "modules",

interp->modules);

initmain();

if (!Py_NoSiteFlag)

initsite();

}

if (!PyErr_Occurred())

return tstate;

/* Oops, it didn't work. Undo it all. */

PyErr_Print();

PyThreadState_Clear(tstate);

PyThreadState_Swap(save_tstate);

PyThreadState_Delete(tstate);

PyInterpreterState_Delete(interp);

return NULL;

}

/* Delete an interpreter and its last thread. This requires that the

given thread state is current, that the thread has no remaining

frames, and that it is its interpreter's only remaining thread.

It is a fatal error to violate these constraints.

(Py_Finalize() doesn't have these constraints -- it zaps

everything, regardless.)

Locking: as above.

*/

void

Py_EndInterpreter(PyThreadState *tstate)

{

PyInterpreterState *interp = tstate->interp;

if (tstate != PyThreadState_Get())

Py_FatalError("Py_EndInterpreter: thread is not current");

if (tstate->frame != NULL)

Py_FatalError("Py_EndInterpreter: thread still has a frame");

if (tstate != interp->tstate_head || tstate->next != NULL)

Py_FatalError("Py_EndInterpreter: not the last thread");

PyImport_Cleanup();

PyInterpreterState_Clear(interp);

PyThreadState_Swap(NULL);

PyInterpreterState_Delete(interp);

}

static char *progname = "python";

void

Py_SetProgramName(char *pn)

{

if (pn && *pn)

progname = pn;

}

char *

Py_GetProgramName(void)

{

return progname;

}

static char *default_home = NULL;

void

Py_SetPythonHome(char *home)

{

default_home = home;

}

char *

Py_GetPythonHome(void)

{

char *home = default_home;

if (home == NULL && !Py_IgnoreEnvironmentFlag)

home = Py_GETENV("PYTHONHOME");

return home;

}

/* Create __main__ module */

static void

initmain(void)

{

PyObject *m, *d;

m = PyImport_AddModule("__main__");

if (m == NULL)

Py_FatalError("can't create __main__ module");

d = PyModule_GetDict(m);

if (PyDict_GetItemString(d, "__builtins__") == NULL) {

PyObject *bimod = PyImport_ImportModule("__builtin__");

if (bimod == NULL ||

PyDict_SetItemString(d, "__builtins__", bimod) != 0)

Py_FatalError("can't add __builtins__ to __main__");

Py_DECREF(bimod);

}

}

/* Import the site module (not into __main__ though) */

static void

initsite(void)

{

PyObject *m, *f;

m = PyImport_ImportModule("site");

if (m == NULL) {

f = PySys_GetObject("stderr");

if (Py_VerboseFlag) {

PyFile_WriteString(

"'import site' failed; traceback:\n", f);

PyErr_Print();

}

else {

PyFile_WriteString(

"'import site' failed; use -v for traceback\n", f);

PyErr_Clear();

}

}

else {

Py_DECREF(m);

}

}

/* Parse input from a file and execute it */

int

PyRun_AnyFile(FILE *fp, char *filename)

{

return PyRun_AnyFileExFlags(fp, filename, 0, NULL);

}

int

PyRun_AnyFileFlags(FILE *fp, char *filename, PyCompilerFlags *flags)

{

return PyRun_AnyFileExFlags(fp, filename, 0, flags);

}

int

PyRun_AnyFileEx(FILE *fp, char *filename, int closeit)

{

return PyRun_AnyFileExFlags(fp, filename, closeit, NULL);

}

int

PyRun_AnyFileExFlags(FILE *fp, char *filename, int closeit,

PyCompilerFlags *flags)

{

if (filename == NULL)

filename = "???";

if (Py_FdIsInteractive(fp, filename)) {

int err = PyRun_InteractiveLoopFlags(fp, filename, flags);

if (closeit)

fclose(fp);

return err;

}

else

return PyRun_SimpleFileExFlags(fp, filename, closeit, flags);

}

int

PyRun_InteractiveLoop(FILE *fp, char *filename)

{

return PyRun_InteractiveLoopFlags(fp, filename, NULL);

}

int

PyRun_InteractiveLoopFlags(FILE *fp, char *filename, PyCompilerFlags *flags)

{

PyObject *v;

int ret;

PyCompilerFlags local_flags;

if (flags == NULL) {

flags = &local_flags;

local_flags.cf_flags = 0;

}

v = PySys_GetObject("ps1");

if (v == NULL) {

PySys_SetObject("ps1", v = PyString_FromString(">>> "));

Py_XDECREF(v);

}

v = PySys_GetObject("ps2");

if (v == NULL) {

PySys_SetObject("ps2", v = PyString_FromString("... "));

Py_XDECREF(v);

}

for (;;) {

ret = PyRun_InteractiveOneFlags(fp, filename, flags);

#ifdef Py_REF_DEBUG

fprintf(stderr, "[%ld refs]\n", _Py_RefTotal);

#endif

if (ret == E_EOF)

return 0;

/*

if (ret == E_NOMEM)

return -1;

*/

}

}

int

PyRun_InteractiveOne(FILE *fp, char *filename)

{

return PyRun_InteractiveOneFlags(fp, filename, NULL);

}

/* compute parser flags based on compiler flags */

#if 0 /* future keyword */

#define PARSER_FLAGS(flags) \

(((flags) && (flags)->cf_flags & CO_GENERATOR_ALLOWED) ? \

PyPARSE_YIELD_IS_KEYWORD : 0)

#else

#define PARSER_FLAGS(flags) 0

#endif

int

PyRun_InteractiveOneFlags(FILE *fp, char *filename, PyCompilerFlags *flags)

{

PyObject *m, *d, *v, *w;

node *n;

perrdetail err;

char *ps1 = "", *ps2 = "";

v = PySys_GetObject("ps1");

if (v != NULL) {

v = PyObject_Str(v);

if (v == NULL)

PyErr_Clear();

else if (PyString_Check(v))

ps1 = PyString_AsString(v);

}

w = PySys_GetObject("ps2");

if (w != NULL) {

w = PyObject_Str(w);

if (w == NULL)

PyErr_Clear();

else if (PyString_Check(w))

ps2 = PyString_AsString(w);

}

n = PyParser_ParseFileFlags(fp, filename, &_PyParser_Grammar,

Py_single_input, ps1, ps2, &err,

PARSER_FLAGS(flags));

Py_XDECREF(v);

Py_XDECREF(w);

if (n == NULL) {

if (err.error == E_EOF) {

if (err.text)

PyMem_DEL(err.text);

return E_EOF;

}

err_input(&err);

PyErr_Print();

return err.error;

}

m = PyImport_AddModule("__main__");

if (m == NULL)

return -1;

d = PyModule_GetDict(m);

v = run_node(n, filename, d, d, flags);

if (v == NULL) {

PyErr_Print();

return -1;

}

Py_DECREF(v);

if (Py_FlushLine())

PyErr_Clear();

return 0;

}

int

PyRun_SimpleFile(FILE *fp, char *filename)

{

return PyRun_SimpleFileEx(fp, filename, 0);

}

/* Check whether a file maybe a pyc file: Look at the extension,

the file type, and, if we may close it, at the first few bytes. */

static int

maybe_pyc_file(FILE *fp, char* filename, char* ext, int closeit)

{

if (strcmp(ext, ".pyc") == 0 || strcmp(ext, ".pyo") == 0)

return 1;

#ifdef macintosh

/* On a mac, we also assume a pyc file for types 'PYC ' and 'APPL' */

if (PyMac_getfiletype(filename) == 'PYC '

|| PyMac_getfiletype(filename) == 'APPL')

return 1;

#endif /* macintosh */

/* Only look into the file if we are allowed to close it, since

it then should also be seekable. */

if (closeit) {

/* Read only two bytes of the magic. If the file was opened in

text mode, the bytes 3 and 4 of the magic (\r\n) might not

be read as they are on disk. */

unsigned int halfmagic = PyImport_GetMagicNumber() & 0xFFFF;

unsigned char buf[2];

/* Mess: In case of -x, the stream is NOT at its start now,

and ungetc() was used to push back the first newline,

which makes the current stream position formally undefined,

and a x-platform nightmare.

Unfortunately, we have no direct way to know whether -x

was specified. So we use a terrible hack: if the current

stream position is not 0, we assume -x was specified, and

give up. Bug 132850 on SourceForge spells out the

hopelessness of trying anything else (fseek and ftell

don't work predictably x-platform for text-mode files).

*/

int ispyc = 0;

if (ftell(fp) == 0) {

if (fread(buf, 1, 2, fp) == 2 &&

((unsigned int)buf[1]<<8 | buf[0]) == halfmagic)

ispyc = 1;

rewind(fp);

}

return ispyc;

}

return 0;

}

int

PyRun_SimpleFileEx(FILE *fp, char *filename, int closeit)

{

return PyRun_SimpleFileExFlags(fp, filename, closeit, NULL);

}

int

PyRun_SimpleFileExFlags(FILE *fp, char *filename, int closeit,

PyCompilerFlags *flags)

{

PyObject *m, *d, *v;

char *ext;

m = PyImport_AddModule("__main__");

if (m == NULL)

return -1;

d = PyModule_GetDict(m);

ext = filename + strlen(filename) - 4;

if (maybe_pyc_file(fp, filename, ext, closeit)) {

/* Try to run a pyc file. First, re-open in binary */

if (closeit)

fclose(fp);

if( (fp = fopen(filename, "rb")) == NULL ) {

fprintf(stderr, "python: Can't reopen .pyc file\n");

return -1;

}

/* Turn on optimization if a .pyo file is given */

if (strcmp(ext, ".pyo") == 0)

Py_OptimizeFlag = 1;

v = run_pyc_file(fp, filename, d, d, flags);

} else {

v = PyRun_FileExFlags(fp, filename, Py_file_input, d, d,

closeit, flags);

}

if (v == NULL) {

PyErr_Print();

return -1;

}

Py_DECREF(v);

if (Py_FlushLine())

PyErr_Clear();

return 0;

}

int

PyRun_SimpleString(char *command)

{

return PyRun_SimpleStringFlags(command, NULL);

}

int

PyRun_SimpleStringFlags(char *command, PyCompilerFlags *flags)

{

PyObject *m, *d, *v;

m = PyImport_AddModule("__main__");

if (m == NULL)

return -1;

d = PyModule_GetDict(m);

v = PyRun_StringFlags(command, Py_file_input, d, d, flags);

if (v == NULL) {

PyErr_Print();

return -1;

}

Py_DECREF(v);

if (Py_FlushLine())

PyErr_Clear();

return 0;

}

static int

parse_syntax_error(PyObject *err, PyObject **message, char **filename,

int *lineno, int *offset, char **text)

{

long hold;

PyObject *v;

/* old style errors */

if (PyTuple_Check(err))

return PyArg_ParseTuple(err, "O(ziiz)", message, filename,

lineno, offset, text);

/* new style errors. `err' is an instance */

if (! (v = PyObject_GetAttrString(err, "msg")))

goto finally;

*message = v;

if (!(v = PyObject_GetAttrString(err, "filename")))

goto finally;

if (v == Py_None)

*filename = NULL;

else if (! (*filename = PyString_AsString(v)))

goto finally;

Py_DECREF(v);

if (!(v = PyObject_GetAttrString(err, "lineno")))

goto finally;

hold = PyInt_AsLong(v);

Py_DECREF(v);

v = NULL;

if (hold < 0 && PyErr_Occurred())

goto finally;

*lineno = (int)hold;

if (!(v = PyObject_GetAttrString(err, "offset")))

goto finally;

if (v == Py_None) {

*offset = -1;

Py_DECREF(v);

v = NULL;

} else {

hold = PyInt_AsLong(v);

Py_DECREF(v);

v = NULL;

if (hold < 0 && PyErr_Occurred())

goto finally;

*offset = (int)hold;

}

if (!(v = PyObject_GetAttrString(err, "text")))

goto finally;

if (v == Py_None)

*text = NULL;

else if (! (*text = PyString_AsString(v)))

goto finally;

Py_DECREF(v);

return 1;

finally:

Py_XDECREF(v);

return 0;

}

void

PyErr_Print(void)

{

PyErr_PrintEx(1);

}

static void

print_error_text(PyObject *f, int offset, char *text)

{

char *nl;

if (offset >= 0) {

if (offset > 0 && offset == (int)strlen(text))

offset--;

for (;;) {

nl = strchr(text, '\n');

if (nl == NULL || nl-text >= offset)

break;

offset -= (nl+1-text);

text = nl+1;

}

while (*text == ' ' || *text == '\t') {

text++;

offset--;

}

}

PyFile_WriteString(" ", f);

PyFile_WriteString(text, f);

if (*text == '\0' || text[strlen(text)-1] != '\n')

PyFile_WriteString("\n", f);

if (offset == -1)

return;

PyFile_WriteString(" ", f);

offset--;

while (offset > 0) {

PyFile_WriteString(" ", f);

offset--;

}

PyFile_WriteString("^\n", f);

}

static void

handle_system_exit(void)

{

PyObject *exception, *value, *tb;

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

if (Py_FlushLine())

PyErr_Clear();

fflush(stdout);

if (value == NULL || value == Py_None)

Py_Exit(0);

if (PyInstance_Check(value)) {

/* The error code should be in the `code' attribute. */

PyObject *code = PyObject_GetAttrString(value, "code");

if (code) {

Py_DECREF(value);

value = code;

if (value == Py_None)

Py_Exit(0);

}

/* If we failed to dig out the 'code' attribute,

just let the else clause below print the error. */

}

if (PyInt_Check(value))

Py_Exit((int)PyInt_AsLong(value));

else {

PyObject_Print(value, stderr, Py_PRINT_RAW);

PySys_WriteStderr("\n");

Py_Exit(1);

}

}

void

PyErr_PrintEx(int set_sys_last_vars)

{

PyObject *exception, *v, *tb, *hook;

if (PyErr_ExceptionMatches(PyExc_SystemExit)) {

handle_system_exit();

}

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

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

if (exception == NULL)

return;

if (set_sys_last_vars) {

PySys_SetObject("last_type", exception);

PySys_SetObject("last_value", v);

PySys_SetObject("last_traceback", tb);

}

hook = PySys_GetObject("excepthook");

if (hook) {

PyObject *args = Py_BuildValue("(OOO)",

exception, v ? v : Py_None, tb ? tb : Py_None);

PyObject *result = PyEval_CallObject(hook, args);

if (result == NULL) {

PyObject *exception2, *v2, *tb2;

if (PyErr_ExceptionMatches(PyExc_SystemExit)) {

handle_system_exit();

}

PyErr_Fetch(&exception2, &v2, &tb2);

PyErr_NormalizeException(&exception2, &v2, &tb2);

if (Py_FlushLine())

PyErr_Clear();

fflush(stdout);

PySys_WriteStderr("Error in sys.excepthook:\n");

PyErr_Display(exception2, v2, tb2);

PySys_WriteStderr("\nOriginal exception was:\n");

PyErr_Display(exception, v, tb);

Py_XDECREF(exception2);

Py_XDECREF(v2);

Py_XDECREF(tb2);

}

Py_XDECREF(result);

Py_XDECREF(args);

} else {

PySys_WriteStderr("sys.excepthook is missing\n");

PyErr_Display(exception, v, tb);

}

Py_XDECREF(exception);

Py_XDECREF(v);

Py_XDECREF(tb);

}

void PyErr_Display(PyObject *exception, PyObject *value, PyObject *tb)

{

int err = 0;

PyObject *v = value;

PyObject *f = PySys_GetObject("stderr");

if (f == NULL)

fprintf(stderr, "lost sys.stderr\n");

else {

if (Py_FlushLine())

PyErr_Clear();

fflush(stdout);

if (tb && tb != Py_None)

err = PyTraceBack_Print(tb, f);

if (err == 0 &&

PyObject_HasAttrString(v, "print_file_and_line"))

{

PyObject *message;

char *filename, *text;

int lineno, offset;

if (!parse_syntax_error(v, &message, &filename,

&lineno, &offset, &text))

PyErr_Clear();

else {

char buf[10];

PyFile_WriteString(" File \"", f);

if (filename == NULL)

PyFile_WriteString("<string>", f);

else

PyFile_WriteString(filename, f);

PyFile_WriteString("\", line ", f);

PyOS_snprintf(buf, sizeof(buf), "%d", lineno);

PyFile_WriteString(buf, f);

PyFile_WriteString("\n", f);

if (text != NULL)

print_error_text(f, offset, text);

v = message;

/* Can't be bothered to check all those

PyFile_WriteString() calls */

if (PyErr_Occurred())

err = -1;

}

}

if (err) {

/* Don't do anything else */

}

else if (PyClass_Check(exception)) {

PyClassObject* exc = (PyClassObject*)exception;

PyObject* className = exc->cl_name;

PyObject* moduleName =

PyDict_GetItemString(exc->cl_dict, "__module__");

if (moduleName == NULL)

err = PyFile_WriteString("<unknown>", f);

else {

char* modstr = PyString_AsString(moduleName);

if (modstr && strcmp(modstr, "exceptions"))

{

err = PyFile_WriteString(modstr, f);

err += PyFile_WriteString(".", f);

}

}

if (err == 0) {

if (className == NULL)

err = PyFile_WriteString("<unknown>", f);

else

err = PyFile_WriteObject(className, f,

Py_PRINT_RAW);

}

}

else

err = PyFile_WriteObject(exception, f, Py_PRINT_RAW);

if (err == 0) {

if (v != NULL && v != Py_None) {

PyObject *s = PyObject_Str(v);

/* only print colon if the str() of the

object is not the empty string

*/

if (s == NULL)

err = -1;

else if (!PyString_Check(s) ||

PyString_GET_SIZE(s) != 0)

err = PyFile_WriteString(": ", f);

if (err == 0)

err = PyFile_WriteObject(s, f, Py_PRINT_RAW);

Py_XDECREF(s);