From ac82b6a041942de19f11f8929da9a5f9d9597212 Mon Sep 17 00:00:00 2001
From: Jack Jansen <jack.jansen@cwi.nl>
Date: Mon, 13 Jul 1998 13:38:29 +0000
Subject: If the preference filename resource is empty don't try to open or
 create the preferences file. This is so that frozen programs don't interfere
 with an existing Python installation, or leave turds in the Preferences
 folder.

---
 Mac/Python/macgetpath.c | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/Mac/Python/macgetpath.c b/Mac/Python/macgetpath.c
index 80918fd..70a1b69 100644
--- a/Mac/Python/macgetpath.c
+++ b/Mac/Python/macgetpath.c
@@ -65,10 +65,11 @@ PERFORMANCE OF THIS SOFTWARE.
 :Lib:test\n\
 :Lib:mac"
 
-static void
+static int
 getpreffilefss(FSSpec *fssp)
 {
 	static int diditbefore=0;
+	static int rv = 1;
 	static FSSpec fss;
     short prefdirRefNum;
     long prefdirDirID;
@@ -88,12 +89,19 @@ getpreffilefss(FSSpec *fssp)
 	    }
 	    
 	    HLock(namehandle);
-		(void)FSMakeFSSpec(prefdirRefNum, prefdirDirID, (unsigned char *)*namehandle, &fss);
+	    if ( **namehandle == '\0' ) {
+	    	/* Empty string means don't use preferences file */
+	    	rv = 0;
+	    } else {
+	    	/* There is a filename, construct the fsspec */
+			(void)FSMakeFSSpec(prefdirRefNum, prefdirDirID, (unsigned char *)*namehandle, &fss);
+		}
 		HUnlock(namehandle);
 		ReleaseResource(namehandle);
 		diditbefore = 1;
 	}
 	*fssp = fss;
+	return rv;
 }
 
 char *
@@ -162,7 +170,8 @@ PyMac_OpenPrefFile()
     short prefrh;
     OSErr err;
 
-	getpreffilefss(&dirspec);
+	if ( !getpreffilefss(&dirspec))
+		return -1;
 	prefrh = FSpOpenResFile(&dirspec, fsRdWrShPerm);
 	if ( prefrh < 0 ) {
 #if 0
@@ -225,7 +234,7 @@ PyMac_GetPythonDir()
 	    prefrh = PyMac_OpenPrefFile();
 	    handle = (AliasHandle)Get1Resource('alis', PYTHONHOME_ID);
 	    if ( handle == NULL ) {
-	    	(void)StopAlert(BADPREFFILE_ID, NULL);
+	    	/* (void)StopAlert(BADPREFFILE_ID, NULL); */
 	    	diditbefore=1;
 	    	return ":";
 	    }
-- 
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