move LocaleGuard "up" into libpbd; use LocaleGuard to replace utterly broken std::locale() in Gtkmm2ext::BarController handling of logarithmic values

git-svn-id: svn://localhost/ardour2/branches/2.0-ongoing@6598 d708f5d6-7413-0410-9779-e7cbd77b26cf

3 files changed, 55 insertions, 0 deletions

diff --git a/libs/pbd/SConscript b/libs/pbd/SConscript
index 96d1a772b5..b33ab58173 100644
--- a/libs/pbd/SConscript
+++ b/libs/pbd/SConscript
@@ -29,6 +29,7 @@ dmalloc.cc
 error.cc
 fpu.cc
 id.cc
+localeguard.cc
 mountpoint.cc
 path.cc
 pathscanner.cc
diff --git a/libs/pbd/localeguard.cc b/libs/pbd/localeguard.cc
new file mode 100644
index 0000000000..a97a99bfd3
--- /dev/null
+++ b/libs/pbd/localeguard.cc
@@ -0,0 +1,21 @@
+#include <cstring>
+#include <locale.h>
+#include <stdlib.h>
+
+#include "pbd/localeguard.h"
+
+PBD::LocaleGuard::LocaleGuard (const char* str)
+{
+	old = strdup (setlocale (LC_NUMERIC, NULL));
+	if (strcmp (old, str)) {
+		setlocale (LC_NUMERIC, str);
+	} 
+}
+
+PBD::LocaleGuard::~LocaleGuard ()
+{
+	setlocale (LC_NUMERIC, old);
+	free ((char*)old);
+}
+
+
diff --git a/libs/pbd/pbd/localeguard.h b/libs/pbd/pbd/localeguard.h
new file mode 100644
index 0000000000..e03e4ce4f2
--- /dev/null
+++ b/libs/pbd/pbd/localeguard.h
@@ -0,0 +1,33 @@
+/*
+    Copyright (C) 1999-2010 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.
+
+*/
+
+#ifndef __pbd_localeguard_h__
+#define __pbd_localeguard_h__
+
+namespace PBD {
+
+struct LocaleGuard {
+    LocaleGuard (const char*);
+    ~LocaleGuard ();
+    const char* old;
+};
+
+}; // namespace
+
+#endif /* __pbd_localeguard_h__ */