From 1591c15b8b11dfe343d48841375d4de825927f5a Mon Sep 17 00:00:00 2001
From: rathnor <rathnor>
Date: Sat, 19 Jul 2003 14:07:28 +0000
Subject: make sure we pass null (rather than blank) to XOpenDisplay

---
 src/FbTk/App.cc | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/src/FbTk/App.cc b/src/FbTk/App.cc
index 3daf61a..18c6e56 100644
--- a/src/FbTk/App.cc
+++ b/src/FbTk/App.cc
@@ -40,6 +40,10 @@ App::App(const char *displayname):m_done(false) {
     if (s_app != 0)
         throw std::string("Can't create more than one instance of FbTk::App");
     s_app = this;
+    // this allows the use of std::string.c_str(), which returns 
+    // a blank string, rather than a null string, so we make them equivalent
+    if (displayname != 0 && displayname[0] == '\0')
+        displayname = 0;
     m_display = XOpenDisplay(displayname);
 }
 
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