add EPA stuff from 2.X

git-svn-id: svn://localhost/ardour2/branches/3.0@8337 d708f5d6-7413-0410-9779-e7cbd77b26cf

1 files changed, 72 insertions, 0 deletions

diff --git a/libs/pbd/epa.cc b/libs/pbd/epa.cc
new file mode 100644
index 0000000000..71387b4c23
--- /dev/null
+++ b/libs/pbd/epa.cc
@@ -0,0 +1,72 @@
+/*
+    Copyright (C) 2010 Paul Davis 
+
+    This program is free software; you can redistribute it and/or modify
+    it under the terms of the GNU General Public License as published by
+    the Free Software Foundation; either version 2 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU General Public License for more details.
+
+    You should have received a copy of the GNU General Public License
+    along with this program; if not, write to the Free Software
+    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+
+*/
+
+#include <cstdlib>
+#include <iostream>
+
+#include "pbd/epa.h"
+
+extern char** environ;
+
+using namespace PBD;
+using namespace std;
+
+EnvironmentalProtectionAgency* EnvironmentalProtectionAgency::_global_epa = 0;
+
+EnvironmentalProtectionAgency::EnvironmentalProtectionAgency ()
+{
+        save ();
+}
+
+EnvironmentalProtectionAgency::~EnvironmentalProtectionAgency()
+{
+        restore ();
+}
+
+void
+EnvironmentalProtectionAgency::save ()
+{
+        e.clear ();
+
+        for (size_t i = 0; environ[i]; ++i) {
+
+                string estring = environ[i];
+                string::size_type equal = estring.find_first_of ('=');
+
+                if (equal == string::npos) {
+                        /* say what? an environ value without = ? */
+                        continue;
+                }
+
+                string before = estring.substr (0, equal);
+                string after = estring.substr (equal+1);
+
+                cerr << "Save [" << before << "] = " << after << endl;
+
+                e.insert (pair<string,string>(before,after));
+        }
+}                         
+void
+EnvironmentalProtectionAgency::restore ()
+{
+        for (map<string,string>::iterator i = e.begin(); i != e.end(); ++i) {
+                cerr << "Restore [" << i->first << "] = " << i->second << endl;
+                setenv (i->first.c_str(), i->second.c_str(), 1);
+        }
+}