[gnome-games] Escape tag values, based on a patch by Ted Ying

[Robert Ancell <rancell src gnome org>]

commit a59c50133304922cff6d3598d5afd6185f45d280
Author: Robert Ancell <robert ancell canonical com>
Date:   Fri Jul 1 11:58:03 2011 +0100

    Escape tag values, based on a patch by Ted Ying

 glchess/src/chess-pgn.vala |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)
---
diff --git a/glchess/src/chess-pgn.vala b/glchess/src/chess-pgn.vala
index ee02c65..7cf025d 100644
--- a/glchess/src/chess-pgn.vala
+++ b/glchess/src/chess-pgn.vala
@@ -132,15 +132,20 @@ public class PGNGame
         tags.insert ("Result", PGNGame.RESULT_IN_PROGRESS);
     }
 
+    public string escape (string value)
+    {    
+        var a = value.replace ("\\", "\\\\");
+        return a.replace ("\"", "\\\"");
+    }
+
     public void write (File file) throws Error
     {
         var data = new StringBuilder ();
 
-        // FIXME: Escape \ and " in tag values
         var keys = tags.get_keys ();
         keys.sort ((CompareFunc) compare_tag);
         foreach (var key in keys)
-            data.append ("[%s \"%s\"]\n".printf (key, tags.lookup (key)));
+            data.append ("[%s \"%s\"]\n".printf (key, escape (tags.lookup (key))));
         data.append ("\n");
 
         int i = 0;