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diff --git a/common/validators.cpp b/common/validators.cpp
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+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2013 Wayne Stambaugh <stambaughw@verizon.net>
+ * Copyright (C) 2004-2013 KiCad Developers, see change_log.txt for contributors.
+ *
+ * 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, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+/**
+ * @file validators.cpp
+ * @brief Custom text control validator implementations.
+ */
+
+#include <kicad_string.h>
+#include <validators.h>
+
+#include <wx/textentry.h>
+#include <wx/log.h>
+
+
+FILE_NAME_CHAR_VALIDATOR::FILE_NAME_CHAR_VALIDATOR( wxString* aValue ) :
+    wxTextValidator( wxFILTER_EXCLUDE_CHAR_LIST, aValue )
+{
+    // The Windows (DOS) file system forbidden characters already include the forbidden
+    // file name characters for both Posix and OSX systems.  The characters \/:*?|"<> are
+    // illegal and filtered by the validator.
+    wxString illegalChars = wxFileName::GetForbiddenChars( wxPATH_DOS );
+    wxTextValidator nameValidator( wxFILTER_EXCLUDE_CHAR_LIST );
+    wxArrayString illegalCharList;
+
+    for( unsigned i = 0;  i < illegalChars.size();  i++ )
+        illegalCharList.Add( wxString( illegalChars[i] ) );
+
+    SetExcludes( illegalCharList );
+ }
+
+
+FILE_NAME_WITH_PATH_CHAR_VALIDATOR::FILE_NAME_WITH_PATH_CHAR_VALIDATOR( wxString* aValue ) :
+    wxTextValidator( wxFILTER_EXCLUDE_CHAR_LIST | wxFILTER_EMPTY, aValue )
+{
+    // The Windows (DOS) file system forbidden characters already include the forbidden
+    // file name characters for both Posix and OSX systems.  The characters *?|"<> are
+    // illegal and filtered by the validator, but /\: are valid (\ and : only on Windows.
+    wxString illegalChars = wxFileName::GetForbiddenChars( wxPATH_DOS );
+    wxTextValidator nameValidator( wxFILTER_EXCLUDE_CHAR_LIST );
+    wxArrayString illegalCharList;
+
+    for( unsigned i = 0;  i < illegalChars.size();  i++ )
+    {
+        if( illegalChars[i] == '/' )
+            continue;
+
+#if defined (__WINDOWS__)
+        if( illegalChars[i] == '\\' || illegalChars[i] == ':' )
+            continue;
+#endif
+        illegalCharList.Add( wxString( illegalChars[i] ) );
+    }
+
+    SetExcludes( illegalCharList );
+}
+
+
+ENVIRONMENT_VARIABLE_CHAR_VALIDATOR::ENVIRONMENT_VARIABLE_CHAR_VALIDATOR( wxString* aValue ) :
+    wxTextValidator( wxFILTER_INCLUDE_CHAR_LIST | wxFILTER_EMPTY, aValue )
+{
+    wxString includeChars( wxT( "ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789_" ) );
+    SetCharIncludes( includeChars );
+}