kernel: Add error_logger:limit_term/1

Calling error_logger:limit_term/1 before sending terms as events to
the error_logger can be used for limiting the size of the messages.
Doing so will not change the output, but potentially save memory.

The Kernel variable error_logger_format_depth is used when limiting
the size of terms.

1 files changed, 18 insertions, 0 deletions

diff --git a/lib/kernel/src/error_logger.erl b/lib/kernel/src/error_logger.erl
index 81f1bf8d97..93a3f4f2e5 100644
--- a/lib/kernel/src/error_logger.erl
+++ b/lib/kernel/src/error_logger.erl
@@ -31,6 +31,8 @@
 	 handle_event/2, handle_call/2, handle_info/2,
 	 terminate/2]).
 
+-export([limit_term/1]).
+
 -define(buffer_size, 10).
 
 %%-----------------------------------------------------------------
@@ -518,3 +520,19 @@ string_p1([H|T]) when is_list(H) ->
     end;
 string_p1([]) -> true;
 string_p1(_) ->  false.
+
+-spec limit_term(term()) -> term().
+
+limit_term(Term) ->
+    case get_depth() of
+        unlimited -> Term;
+        D -> io_lib:limit_term(Term, D)
+    end.
+
+get_depth() ->
+    case application:get_env(kernel, error_logger_format_depth) of
+	{ok, Depth} when is_integer(Depth) ->
+	    max(10, Depth);
+	undefined ->
+	    unlimited
+    end.