--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/hotspot/share/logging/logOutput.cpp	Tue Sep 12 19:03:39 2017 +0200
@@ -0,0 +1,98 @@
+/*
+ * Copyright (c) 2015, 2017, Oracle and/or its affiliates. All rights reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
+ * or visit www.oracle.com if you need additional information or have any
+ * questions.
+ *
+ */
+#include "precompiled.hpp"
+#include "logging/logFileStreamOutput.hpp"
+#include "logging/logOutput.hpp"
+#include "logging/logTagSet.hpp"
+#include "memory/allocation.inline.hpp"
+#include "prims/jvm.h"
+#include "runtime/mutexLocker.hpp"
+#include "runtime/os.inline.hpp"
+
+LogOutput::~LogOutput() {
+  os::free(_config_string);
+}
+
+void LogOutput::clear_config_string() {
+  os::free(_config_string);
+  _config_string_buffer_size = InitialConfigBufferSize;
+  _config_string = NEW_C_HEAP_ARRAY(char, _config_string_buffer_size, mtLogging);
+  _config_string[0] = '\0';
+}
+
+void LogOutput::set_config_string(const char* string) {
+  os::free(_config_string);
+  _config_string = os::strdup(string, mtLogging);
+  _config_string_buffer_size = strlen(_config_string) + 1;
+}
+
+void LogOutput::add_to_config_string(const LogTagSet* ts, LogLevelType level) {
+  if (_config_string_buffer_size < InitialConfigBufferSize) {
+    _config_string_buffer_size = InitialConfigBufferSize;
+    _config_string = REALLOC_C_HEAP_ARRAY(char, _config_string, _config_string_buffer_size, mtLogging);
+  }
+
+  size_t offset = strlen(_config_string);
+  if (offset > 0) {
+    // Add commas in-between tag and level combinations in the config string
+    _config_string[offset++] = ',';
+  }
+
+  for (;;) {
+    int ret = ts->label(_config_string + offset, _config_string_buffer_size - offset, "+");
+    if (ret == -1) {
+      // Double the buffer size and retry
+      _config_string_buffer_size *= 2;
+      _config_string = REALLOC_C_HEAP_ARRAY(char, _config_string, _config_string_buffer_size, mtLogging);
+      continue;
+    }
+    break;
+  };
+
+  offset = strlen(_config_string);
+  for (;;) {
+    int ret = jio_snprintf(_config_string + offset, _config_string_buffer_size - offset, "=%s", LogLevel::name(level));
+    if (ret == -1) {
+      _config_string_buffer_size *= 2;
+      _config_string = REALLOC_C_HEAP_ARRAY(char, _config_string, _config_string_buffer_size, mtLogging);
+      continue;
+    }
+    break;
+  }
+}
+
+void LogOutput::describe(outputStream *out) {
+  out->print("%s ", name());
+  out->print_raw(config_string());
+  out->print(" ");
+  char delimiter[2] = {0};
+  for (size_t d = 0; d < LogDecorators::Count; d++) {
+    LogDecorators::Decorator decorator = static_cast<LogDecorators::Decorator>(d);
+    if (decorators().is_decorator(decorator)) {
+      out->print("%s%s", delimiter, LogDecorators::name(decorator));
+      *delimiter = ',';
+    }
+  }
+}
+