sasl: set encoding of SASL report log

This can now be explicitly set by the 'sasl_error_logger'
configuration parameter, but if not set, the default encoding is now
utf8. When printing to this log, the Unicode translation modifier, t,
might be used in the format string.

2 files changed, 20 insertions, 5 deletions

diff --git a/lib/sasl/doc/src/sasl_app.xml b/lib/sasl/doc/src/sasl_app.xml
index 0576397f9b..e0693fcb60 100644
--- a/lib/sasl/doc/src/sasl_app.xml
+++ b/lib/sasl/doc/src/sasl_app.xml
@@ -103,13 +103,16 @@
           <tag><c>{file,FileName}</c></tag>
           <item><p>Installs <c>sasl_report_file_h</c> in the error logger.
             All reports go to file <c>FileName</c>, which is a
-            string.</p></item>
+            string. The file is opened in <c>write</c> mode with encoding
+	    <c>utf8</c>.</p></item>
           <tag><c>{file,FileName,Modes}</c></tag>
           <item><p>Same as <c>{file,FileName}</c>, except that <c>Modes</c>
             allows you to specify the modes used for opening the <c>FileName</c>
             given to the <seealso marker="kernel:file#open/2">file:open/2</seealso>
-            call. When not specified, <c>Modes</c> defaults to <c>[write]</c>.
-            Use <c>[append]</c> to have the <c>FileName</c> open in append mode.
+            call. By default, the file is opened in <c>write</c> mode
+            with encoding <c>utf8</c>. Use <c>[append]</c> to have
+            the <c>FileName</c> open in append mode. A different
+            encoding can also be specified.
             <c>FileName</c> is a string.</p></item>
           <tag><c>false</c></tag>
           <item><p>No SASL error logger handler is installed.</p></item>
diff --git a/lib/sasl/src/sasl_report_file_h.erl b/lib/sasl/src/sasl_report_file_h.erl
index 21746839fa..d3b5c7dc0d 100644
--- a/lib/sasl/src/sasl_report_file_h.erl
+++ b/lib/sasl/src/sasl_report_file_h.erl
@@ -29,15 +29,27 @@
 	 handle_event/2, handle_call/2, handle_info/2,
 	 terminate/2]).
 
-init({File, Modes, Type}) when is_list(Modes) ->
+init({File, Modes0, Type}) when is_list(Modes0) ->
     process_flag(trap_exit, true),
+    Modes1 =
+        case lists:keymember(encoding,1,Modes0) of
+            true -> Modes0;
+            false -> [{encoding,utf8}|Modes0]
+        end,
+    Modes =
+        case [M || M <- Modes1, lists:member(M,[write,append,exclusive])] of
+            [] ->
+                [write|Modes1];
+            _ ->
+                Modes1
+        end,
     case file:open(File, Modes) of
 	{ok,Fd} ->
 	    {ok, {Fd, File, Type}};
 	What ->
 	    What
     end.
-    
+
 handle_event({_Type, GL, _Msg}, State) when node(GL) /= node() ->
     {ok, State};
 handle_event(Event, {Fd, File, Type}) ->