SyntaxError__str__(): Do more formatting of the exception here, rather

	than depending on the site that raises the exception.  If the
	filename and lineno attributes are set on the exception object,
	use them to augment the message displayed.

This is part of what is needed to close SoruceForge bug #110628
(Jitterbug PR#278).

Python/exceptions.c

@@ -244,7 +244,7 @@ Exception__str__(PyObject *self, PyObject *args)
 {
     PyObject *out;
 
-    if (!PyArg_ParseTuple(args, "O", &self))
+    if (!PyArg_ParseTuple(args, "O:__str__", &self))
         return NULL;
 
     args = PyObject_GetAttrString(self, "args");
@@ -282,7 +282,7 @@ Exception__getitem__(PyObject *self, PyObject *args)
     PyObject *out;
     PyObject *index;
 
-    if (!PyArg_ParseTuple(args, "OO", &self, &index))
+    if (!PyArg_ParseTuple(args, "OO:__getitem__", &self, &index))
         return NULL;
 
     args = PyObject_GetAttrString(self, "args");
@@ -524,7 +524,7 @@ EnvironmentError__str__(PyObject *self, PyObject *args)
     PyObject *strerror;
     PyObject *rtnval = NULL;
 
-    if (!PyArg_ParseTuple(args, "O", &self))
+    if (!PyArg_ParseTuple(args, "O:__str__", &self))
 	return NULL;
     
     filename = PyObject_GetAttrString(self, "filename");
@@ -734,16 +734,65 @@ SyntaxError__str__(PyObject *self, PyObject *args)
 {
     PyObject *msg;
     PyObject *str;
+    PyObject *filename, *lineno, *result;
 
-    if (!PyArg_ParseTuple(args, "O", &self))
+    if (!PyArg_ParseTuple(args, "O:__str__", &self))
 	return NULL;
 
     if (!(msg = PyObject_GetAttrString(self, "msg")))
 	return NULL;
-    
+
     str = PyObject_Str(msg);
     Py_DECREF(msg);
-    return str;
+    result = str;
+
+    /* XXX -- do all the additional formatting with filename and
+       lineno here */
+
+    if (PyString_Check(str)) {
+	int have_filename = 0;
+	int have_lineno = 0;
+	char *buffer = NULL;
+
+	if (filename = PyObject_GetAttrString(self, "filename"))
+	    have_filename = PyString_Check(filename);
+	else
+	    PyErr_Clear();
+	if (lineno = PyObject_GetAttrString(self, "lineno"))
+	    have_lineno = PyInt_Check(lineno);
+	else
+	    PyErr_Clear();
+
+	if (have_filename || have_lineno) {
+	    int bufsize = (PyString_GET_SIZE(str) + 64 +
+			   PyString_GET_SIZE(filename));
+
+	    buffer = PyMem_Malloc(bufsize);
+	    if (buffer != NULL) {
+		if (have_filename && have_lineno)
+		    sprintf(buffer, "%s (%s, line %d)",
+			    PyString_AS_STRING(str),
+			    PyString_AS_STRING(filename),
+			    PyInt_AsLong(lineno));
+		else if (have_filename)
+		    sprintf(buffer, "%s (%s)",
+			    PyString_AS_STRING(str),
+			    PyString_AS_STRING(filename));
+		else if (have_lineno)
+		    sprintf(buffer, "%s (line %d)",
+			    PyString_AS_STRING(str),
+			    PyInt_AsLong(lineno));
+		result = PyString_FromString(buffer);
+		if (result == NULL)
+		    result = str;
+		else
+		    Py_DECREF(str);
+	    }
+	}
+	Py_XDECREF(filename);
+	Py_XDECREF(lineno);
+    }
+    return result;
 }