From b10c5cbb878af541f4ffa35a9e287c31743c6e97 Mon Sep 17 00:00:00 2001
From: Brad King <brad.king@kitware.com>
Date: Tue, 24 Apr 2012 16:24:17 -0400
Subject: CTest: Simplify environment save/restore

Replace use of AppendEnv/RestoreEnv pairs with instances of
SaveRestoreEnvironment.  Simplify the signature of AppendEnv and use it
in place of similar loops elsewhere.  Move the RestoreEnv implementation
inside the SaveRestoreEnvironment destructor which is the only place
left that calls it.
---
 Source/cmSystemTools.cxx | 49 ++++++++++++++----------------------------------
 1 file changed, 14 insertions(+), 35 deletions(-)

(limited to 'Source/cmSystemTools.cxx')

diff --git a/Source/cmSystemTools.cxx b/Source/cmSystemTools.cxx
index 1376a485bb..548fa7458f 100644
--- a/Source/cmSystemTools.cxx
+++ b/Source/cmSystemTools.cxx
@@ -1630,33 +1630,28 @@ std::vector<std::string> cmSystemTools::GetEnvironmentVariables()
 }
 
 //----------------------------------------------------------------------
-std::vector<std::string> cmSystemTools::AppendEnv(
-  std::vector<std::string>* env)
+void cmSystemTools::AppendEnv(std::vector<std::string> const& env)
 {
-  std::vector<std::string> origEnv = GetEnvironmentVariables();
-
-  if (env && env->size()>0)
+  for(std::vector<std::string>::const_iterator eit = env.begin();
+      eit != env.end(); ++eit)
     {
-    std::vector<std::string>::const_iterator eit;
-
-    for (eit = env->begin(); eit!= env->end(); ++eit)
-      {
-      PutEnv(eit->c_str());
-      }
+    cmSystemTools::PutEnv(eit->c_str());
     }
-
-  return origEnv;
 }
 
 //----------------------------------------------------------------------
-void cmSystemTools::RestoreEnv(const std::vector<std::string>& env)
+cmSystemTools::SaveRestoreEnvironment::SaveRestoreEnvironment()
 {
-  std::vector<std::string>::const_iterator eit;
+  this->Env = cmSystemTools::GetEnvironmentVariables();
+}
 
+//----------------------------------------------------------------------
+cmSystemTools::SaveRestoreEnvironment::~SaveRestoreEnvironment()
+{
   // First clear everything in the current environment:
-  //
   std::vector<std::string> currentEnv = GetEnvironmentVariables();
-  for (eit = currentEnv.begin(); eit!= currentEnv.end(); ++eit)
+  for(std::vector<std::string>::const_iterator
+        eit = currentEnv.begin(); eit != currentEnv.end(); ++eit)
     {
     std::string var(*eit);
 
@@ -1666,27 +1661,11 @@ void cmSystemTools::RestoreEnv(const std::vector<std::string>& env)
       var = var.substr(0, pos);
       }
 
-    UnsetEnv(var.c_str());
+    cmSystemTools::UnsetEnv(var.c_str());
     }
 
   // Then put back each entry from the original environment:
-  //
-  for (eit = env.begin(); eit!= env.end(); ++eit)
-    {
-    PutEnv(eit->c_str());
-    }
-}
-
-//----------------------------------------------------------------------
-cmSystemTools::SaveRestoreEnvironment::SaveRestoreEnvironment()
-{
-  this->Env = cmSystemTools::GetEnvironmentVariables();
-}
-
-//----------------------------------------------------------------------
-cmSystemTools::SaveRestoreEnvironment::~SaveRestoreEnvironment()
-{
-  cmSystemTools::RestoreEnv(this->Env);
+  cmSystemTools::AppendEnv(this->Env);
 }
 #endif
 
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