Fixed crash in Fl_Preferences if 2nd or 3rd argument in the 'path' constructor were NULL

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@5007 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

1 files changed, 10 insertions, 5 deletions

diff --git a/src/Fl_Preferences.cxx b/src/Fl_Preferences.cxx
index 98321d28a..dd3ee828e 100644
--- a/src/Fl_Preferences.cxx
+++ b/src/Fl_Preferences.cxx
@@ -693,12 +693,17 @@ Fl_Preferences::RootNode::RootNode( Fl_Preferences *prefs, Root root, const char
 // - construct the name of the file that will hold our preferences
 Fl_Preferences::RootNode::RootNode( Fl_Preferences *prefs, const char *path, const char *vendor, const char *application )
 {
-  char filename[ FL_PATH_MAX ]; filename[0] = 0;
-
-  snprintf(filename, sizeof(filename), "%s/%s.prefs", path, application);
-
+  if (!vendor)
+    vendor = "unknown";
+  if (!application) {
+    application = "unknown";
+    filename_ = strdup(path);
+  } else {
+    char filename[ FL_PATH_MAX ]; filename[0] = 0;
+    snprintf(filename, sizeof(filename), "%s/%s.prefs", path, application);
+    filename_  = strdup(filename);
+  }
   prefs_       = prefs;
-  filename_    = strdup(filename);
   vendor_      = strdup(vendor);
   application_ = strdup(application);