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.

1 files changed, 14 insertions, 35 deletions

diff --git a/Source/cmSystemTools.cxx b/Source/cmSystemTools.cxx
index 1376a48..548fa74 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