From 599ce9c6c2299b085011c426f0893d494cf9403d Mon Sep 17 00:00:00 2001
From: Jack Jansen <jack.jansen@cwi.nl>
Date: Tue, 20 Feb 2001 22:27:43 +0000
Subject: On OSX passing NULL to NewUniversalFilterProc() does not return NULL
 but a crashing UPP. This made ModalDialog (and, hence EditPythonPrefs and
 EasyDialogs and many others) crash. Fixed.

---
 Mac/Modules/dlg/Dlgmodule.c   | 20 ++++++++++++--------
 Mac/Modules/dlg/dlgsupport.py | 12 ++++++++----
 2 files changed, 20 insertions(+), 12 deletions(-)

diff --git a/Mac/Modules/dlg/Dlgmodule.c b/Mac/Modules/dlg/Dlgmodule.c
index 070283e..2262b54 100644
--- a/Mac/Modules/dlg/Dlgmodule.c
+++ b/Mac/Modules/dlg/Dlgmodule.c
@@ -56,10 +56,12 @@ static pascal Boolean Dlg_UnivFilterProc(DialogPtr dialog,
 	return rv;
 }
 
-static ModalFilterProcPtr
+static ModalFilterUPP
 Dlg_PassFilterProc(PyObject *callback)
 {
 	PyObject *tmp = Dlg_FilterProc_callback;
+	static ModalFilterUPP UnivFilterUpp = NULL;
+	
 	Dlg_FilterProc_callback = NULL;
 	if (callback == Py_None) {
 		Py_XDECREF(tmp);
@@ -68,7 +70,9 @@ Dlg_PassFilterProc(PyObject *callback)
 	Py_INCREF(callback);
 	Dlg_FilterProc_callback = callback;
 	Py_XDECREF(tmp);
-	return &Dlg_UnivFilterProc;
+	if ( UnivFilterUpp == NULL )
+		UnivFilterUpp = NewModalFilterUPP(&Dlg_UnivFilterProc);
+	return UnivFilterUpp;
 }
 
 static PyObject *Dlg_UserItemProc_callback = NULL;
@@ -1077,7 +1081,7 @@ static PyObject *Dlg_ModalDialog(_self, _args)
 	if (!PyArg_ParseTuple(_args, "O",
 	                      &modalFilter))
 		return NULL;
-	ModalDialog(NewModalFilterProc(Dlg_PassFilterProc(modalFilter)),
+	ModalDialog(Dlg_PassFilterProc(modalFilter),
 	            &itemHit);
 	_res = Py_BuildValue("h",
 	                     itemHit);
@@ -1135,7 +1139,7 @@ static PyObject *Dlg_Alert(_self, _args)
 	                      &modalFilter))
 		return NULL;
 	_rv = Alert(alertID,
-	            NewModalFilterProc(Dlg_PassFilterProc(modalFilter)));
+	            Dlg_PassFilterProc(modalFilter));
 	_res = Py_BuildValue("h",
 	                     _rv);
 	return _res;
@@ -1154,7 +1158,7 @@ static PyObject *Dlg_StopAlert(_self, _args)
 	                      &modalFilter))
 		return NULL;
 	_rv = StopAlert(alertID,
-	                NewModalFilterProc(Dlg_PassFilterProc(modalFilter)));
+	                Dlg_PassFilterProc(modalFilter));
 	_res = Py_BuildValue("h",
 	                     _rv);
 	return _res;
@@ -1173,7 +1177,7 @@ static PyObject *Dlg_NoteAlert(_self, _args)
 	                      &modalFilter))
 		return NULL;
 	_rv = NoteAlert(alertID,
-	                NewModalFilterProc(Dlg_PassFilterProc(modalFilter)));
+	                Dlg_PassFilterProc(modalFilter));
 	_res = Py_BuildValue("h",
 	                     _rv);
 	return _res;
@@ -1192,7 +1196,7 @@ static PyObject *Dlg_CautionAlert(_self, _args)
 	                      &modalFilter))
 		return NULL;
 	_rv = CautionAlert(alertID,
-	                   NewModalFilterProc(Dlg_PassFilterProc(modalFilter)));
+	                   Dlg_PassFilterProc(modalFilter));
 	_res = Py_BuildValue("h",
 	                     _rv);
 	return _res;
@@ -1400,7 +1404,7 @@ static PyObject *Dlg_SetUserItemHandler(_self, _args)
 			return NULL;
 		}
 		
-		if (new == Py_None) {
+		if (new == NULL || new == Py_None) {
 			new = NULL;
 			_res = Py_None;
 			Py_INCREF(Py_None);
diff --git a/Mac/Modules/dlg/dlgsupport.py b/Mac/Modules/dlg/dlgsupport.py
index ab22e18..594b7a8 100644
--- a/Mac/Modules/dlg/dlgsupport.py
+++ b/Mac/Modules/dlg/dlgsupport.py
@@ -15,7 +15,7 @@ DialogRef = DialogPtr
 OptHandle = OpaqueByValueType("Handle", "OptResObj")
 
 ModalFilterProcPtr = InputOnlyType("PyObject*", "O")
-ModalFilterProcPtr.passInput = lambda name: "NewModalFilterProc(Dlg_PassFilterProc(%s))" % name
+ModalFilterProcPtr.passInput = lambda name: "Dlg_PassFilterProc(%s)" % name
 ModalFilterUPP = ModalFilterProcPtr
 
 RgnHandle = OpaqueByValueType("RgnHandle", "ResObj")
@@ -79,10 +79,12 @@ static pascal Boolean Dlg_UnivFilterProc(DialogPtr dialog,
 	return rv;
 }
 
-static ModalFilterProcPtr
+static ModalFilterUPP
 Dlg_PassFilterProc(PyObject *callback)
 {
 	PyObject *tmp = Dlg_FilterProc_callback;
+	static ModalFilterUPP UnivFilterUpp = NULL;
+	
 	Dlg_FilterProc_callback = NULL;
 	if (callback == Py_None) {
 		Py_XDECREF(tmp);
@@ -91,7 +93,9 @@ Dlg_PassFilterProc(PyObject *callback)
 	Py_INCREF(callback);
 	Dlg_FilterProc_callback = callback;
 	Py_XDECREF(tmp);
-	return &Dlg_UnivFilterProc;
+	if ( UnivFilterUpp == NULL )
+		UnivFilterUpp = NewModalFilterUPP(&Dlg_UnivFilterProc);
+	return UnivFilterUpp;
 }
 
 static PyObject *Dlg_UserItemProc_callback = NULL;
@@ -267,7 +271,7 @@ setuseritembody = """
 		return NULL;
 	}
 	
-	if (new == Py_None) {
+	if (new == NULL || new == Py_None) {
 		new = NULL;
 		_res = Py_None;
 		Py_INCREF(Py_None);
-- 
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