From 3dd4a53d97e8b4726c732e39b67df1c0eb2cc7eb Mon Sep 17 00:00:00 2001
From: Ken Martin <ken.martin@kitware.com>
Date: Thu, 1 Feb 2007 14:11:06 -0500
Subject: [PATCH] BUG: fix for bug number 3320

---
 Source/kwsys/SystemTools.cxx | 38 ++++++++++++++++++++++++++++++++----
 1 file changed, 34 insertions(+), 4 deletions(-)

diff --git a/Source/kwsys/SystemTools.cxx b/Source/kwsys/SystemTools.cxx
index 8df1a65a6..1a5a42164 100644
--- a/Source/kwsys/SystemTools.cxx
+++ b/Source/kwsys/SystemTools.cxx
@@ -2513,6 +2513,8 @@ void SystemTools::AddTranslationPath(const char * a, const char * b)
   if( SystemTools::FileIsDirectory( path_a.c_str() ) )
     {
     // Make sure the path is a full path and does not contain no '..'
+    // Ken--the following code is incorrect. .. can be in a valid path
+    // for example  /home/martink/MyHubba...Hubba/Src
     if( SystemTools::FileIsFullPath(path_b.c_str()) && path_b.find("..")
         == kwsys_stl::string::npos )
       {
@@ -2605,6 +2607,9 @@ kwsys_stl::string SystemTools::CollapseFullPath(const char* in_path,
   // Split the input path components.
   kwsys_stl::vector<kwsys_stl::string> path_components;
   SystemTools::SplitPath(in_path, path_components);
+  
+  // clean the input path to remove any /./ 
+
   // If the input path is relative, start with a base path.
   if(path_components[0].length() == 0)
     {
@@ -2640,11 +2645,36 @@ kwsys_stl::string SystemTools::CollapseFullPath(const char* in_path,
                               path_components.begin(),
                               path_components.end());
 
-  // Transform the path back to a string.
-  kwsys_stl::string newPath = SystemTools::JoinPath(out_components);
+  // remove any . components as they do nothing
+  kwsys_stl::vector<kwsys_stl::string> clean_components;
+  kwsys_stl::vector<kwsys_stl::string>::iterator i = 
+    out_components.begin();
+  for (; i != out_components.end(); ++i)
+    {
+    if (*i != ".")
+      {
+      clean_components.push_back(*i);
+      }
+    }
+
+
+  // Transform the path back to a string.
+  kwsys_stl::string newPath = SystemTools::JoinPath(clean_components);
+
+  // Update the translation table with this potentially new path.  I am not
+  // sure why this line is here, it seems really questionable, but yet I
+  // would put good money that if I remove it something will break, basically
+  // from what I can see it created a mapping from the collapsed path, to be
+  // replaced by the input path, which almost completely does the opposite of
+  // this function, the only thing preventing this from happening a lot is
+  // that if the in_path has a .. in it, then it is not added to the
+  // translation table. So for most calls this either does nothing due to the
+  // ..  or it adds a translation between identical paths as nothing was
+  // collapsed, so I am going to try to comment it out, and see what hits the
+  // fan, hopefully quickly.
+  // Commented out line below:
+  //SystemTools::AddTranslationPath(newPath.c_str(), in_path);
 
-  // Update the translation table with this potentially new path.
-  SystemTools::AddTranslationPath(newPath.c_str(), in_path);
   SystemTools::CheckTranslationPath(newPath);
 #ifdef _WIN32
   newPath = SystemTools::GetActualCaseForPath(newPath.c_str());