From 21f2e1f25017612959a81bccf4096e36b0c57e10 Mon Sep 17 00:00:00 2001
From: ThorstenB <brehmt@gmail.com>
Date: Fri, 13 Jan 2012 19:58:45 +0100
Subject: [PATCH] #599: Don't crash when a path does not exist.

---
 simgear/misc/sg_path.cxx | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/simgear/misc/sg_path.cxx b/simgear/misc/sg_path.cxx
index e4b3cbf9..d51c93af 100644
--- a/simgear/misc/sg_path.cxx
+++ b/simgear/misc/sg_path.cxx
@@ -490,6 +490,11 @@ std::string SGPath::realpath() const
     return path;
 #else
     char* buf = ::realpath(path.c_str(), NULL);
+    if (!buf)
+    {
+        SG_LOG(SG_IO, SG_ALERT, "ERROR: The path '" << path << "' does not exist in the file system.");
+        return path;
+    }
     std::string p(buf);
     free(buf);
     return p;