From fe2088739f37aac3a9621e848dac592145267b4a Mon Sep 17 00:00:00 2001
From: Andrey Bashlakov <a.bashlakov@corp.vk.com>
Date: Tue, 20 Aug 2019 19:21:56 +0300
Subject: [PATCH] fix json escaping

---
 src/core/osutils.cc | 18 ++++++++++++++++--
 1 file changed, 16 insertions(+), 2 deletions(-)

diff --git a/src/core/osutils.cc b/src/core/osutils.cc
index f023a465..f4a80137 100644
--- a/src/core/osutils.cc
+++ b/src/core/osutils.cc
@@ -501,6 +501,7 @@ string escapeJSON(const string & s)
   string result = "";
 
   for (unsigned int i = 0; i < s.length(); i++)
+  {
     switch (s[i])
     {
       case '\r':
@@ -515,8 +516,21 @@ string escapeJSON(const string & s)
       case '"':
         result += "\\\"";
         break;
-    default:
-      result += s[i];
+      case '\b':
+        result += "\\b";
+        break;
+      case '\f':
+        result += "\\f";
+        break;
+      case '\\':
+        result += "\\\\";
+        break;
+      default:
+      {
+        if (32 <= s[i] && s[i] < 127)
+          result += s[i];
+      }
+    }
   }
 
   return result;