From 5684a2c7715c4cf0524a2be91ddeaf47281634bb Mon Sep 17 00:00:00 2001
From: Richard Carlsson <richardc@klarna.com>
Date: Tue, 17 Apr 2018 15:03:49 +0200
Subject: Move lib:eval_str/1 into mod_esi.erl

---
 lib/inets/src/http_server/mod_esi.erl | 44 ++++++++++++++++++++++++++++++++++-
 1 file changed, 43 insertions(+), 1 deletion(-)

(limited to 'lib/inets/src/http_server/mod_esi.erl')

diff --git a/lib/inets/src/http_server/mod_esi.erl b/lib/inets/src/http_server/mod_esi.erl
index 3206d957d9..b49b3a7093 100644
--- a/lib/inets/src/http_server/mod_esi.erl
+++ b/lib/inets/src/http_server/mod_esi.erl
@@ -561,7 +561,7 @@ eval(#mod{method = Method} = ModData, ESIBody, Modules)
     end.
 
 generate_webpage(ESIBody) ->
-    (catch lib:eval_str(string:concat(ESIBody,". "))).
+    (catch eval_str(string:concat(ESIBody,". "))).
 
 is_authorized(_ESIBody, [all]) ->
     true;
@@ -573,3 +573,45 @@ is_authorized(ESIBody, Modules) ->
 	nomatch ->
 	    false
     end.
+
+%% eval_str(InStr) -> {ok, OutStr} | {error, ErrStr'}
+%%   InStr must represent a body
+%%   Note: If InStr is a binary it has to be a Latin-1 string.
+%%   If you have a UTF-8 encoded binary you have to call
+%%   unicode:characters_to_list/1 before the call to eval_str().
+
+-define(result(F,D), lists:flatten(io_lib:format(F, D))).
+
+-spec eval_str(string()) ->
+                      {'ok', string()} | {'error', string()}.
+
+eval_str(Str) when is_list(Str) ->
+    case erl_scan:tokens([], Str, 0) of
+	{more, _} ->
+	    {error, "Incomplete form (missing .<cr>)??"};
+	{done, {ok, Toks, _}, Rest} ->
+	    case all_white(Rest) of
+		true ->
+		    case erl_parse:parse_exprs(Toks) of
+			{ok, Exprs} ->
+			    case catch erl_eval:exprs(Exprs, erl_eval:new_bindings()) of
+				{value, Val, _} ->
+				    {ok, Val};
+				Other ->
+				    {error, ?result("*** eval: ~p", [Other])}
+			    end;
+			{error, {_Line, Mod, Args}} ->
+                            Msg = ?result("*** ~ts",[Mod:format_error(Args)]),
+                            {error, Msg}
+		    end;
+		false ->
+		    {error, ?result("Non-white space found after "
+				    "end-of-form :~ts", [Rest])}
+		end
+    end.
+
+all_white([$\s|T]) -> all_white(T);
+all_white([$\n|T]) -> all_white(T);
+all_white([$\t|T]) -> all_white(T);
+all_white([])      -> true;
+all_white(_)       -> false.
-- 
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