From fc537f05ba1e5eb13adf27511cddfda216cf0b56 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Wed, 10 Jun 2009 13:02:48 -0400
Subject: [PATCH] ENH: Teach KWSys SystemTools about VMS paths

This teaches ConvertToUnixSlashes to convert VMS paths into posix-style
paths.  We also set the DECC$FILENAME_UNIX_ONLY feature so the process
always sees posix-style paths on disk.
---
 Source/kwsys/SystemTools.cxx | 47 ++++++++++++++++++++++++++++++++++--
 1 file changed, 45 insertions(+), 2 deletions(-)

diff --git a/Source/kwsys/SystemTools.cxx b/Source/kwsys/SystemTools.cxx
index 33388200a..13a2dc28b 100644
--- a/Source/kwsys/SystemTools.cxx
+++ b/Source/kwsys/SystemTools.cxx
@@ -1483,12 +1483,38 @@ kwsys_stl::string SystemTools::EscapeChars(
   return n;
 }
 
+#ifdef __VMS
+static void ConvertVMSToUnix(kwsys_stl::string& path)
+{
+  kwsys_stl::string::size_type rootEnd = path.find(":[");
+  kwsys_stl::string::size_type pathEnd = path.find("]");
+  if(rootEnd != path.npos)
+    {
+    kwsys_stl::string root = path.substr(0, rootEnd);
+    kwsys_stl::string pathPart = path.substr(rootEnd+2, pathEnd - rootEnd-2);
+    const char* pathCString = pathPart.c_str();
+    const char* pos0 = pathCString;
+    for (kwsys_stl::string::size_type pos = 0; *pos0; ++ pos )
+      {
+      if ( *pos0 == '.' )
+        {
+        pathPart[pos] = '/';
+        }
+      pos0 ++;
+      }
+    path = "/"+ root + "/" + pathPart;
+    }
+}
+#endif
+
 // convert windows slashes to unix slashes 
 void SystemTools::ConvertToUnixSlashes(kwsys_stl::string& path)
 {
   const char* pathCString = path.c_str();
   bool hasDoubleSlash = false;
-
+#ifdef __VMS
+  ConvertVMSToUnix(path);
+#else
   const char* pos0 = pathCString;
   const char* pos1 = pathCString+1;
   for (kwsys_stl::string::size_type pos = 0; *pos0; ++ pos )
@@ -1522,7 +1548,7 @@ void SystemTools::ConvertToUnixSlashes(kwsys_stl::string& path)
     {
     SystemTools::ReplaceString(path, "//", "/");
     }
-  
+#endif
   // remove any trailing slash
   if(!path.empty())
     {
@@ -4534,8 +4560,25 @@ SystemToolsManager::~SystemToolsManager()
     }
 }
 
+#if defined(__VMS)
+// On VMS we configure the run time C library to be more UNIX like.
+// http://h71000.www7.hp.com/doc/732final/5763/5763pro_004.html
+extern "C" int decc$feature_get_index(char *name);
+extern "C" int decc$feature_set_value(int index, int mode, int value);
+static int SetVMSFeature(char* name, int value)
+{
+  int i;
+  errno = 0;
+  i = decc$feature_get_index(name);
+  return i >= 0 && (decc$feature_set_value(i, 1, value) >= 0 || errno == 0);
+}
+#endif
+
 void SystemTools::ClassInitialize()
 {
+#ifdef __VMS
+  SetVMSFeature("DECC$FILENAME_UNIX_ONLY", 1);
+#endif
   // Allocate the translation map first.
   SystemTools::TranslationMap = new SystemToolsTranslationMap;
   SystemTools::LongPathMap = new SystemToolsTranslationMap;