/*

 * Copyright (c) 2019, Oracle and/or its affiliates. All rights reserved.

 * Copyright (c) 2019 SAP SE. 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 "memory/resourceArea.hpp"

#include "runtime/os.hpp"

#include "utilities/globalDefinitions.hpp"

#include "utilities/ostream.hpp"

#include "unittest.hpp"

static size_t print_lorem(outputStream* st, bool short_len) {

  // Create a ResourceMark just to make sure the stream does not use ResourceArea

  ResourceMark rm;

  static const char* const lorem = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, "

      "sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Lacinia at quis "

      "risus sed vulputate odio ut enim blandit. Amet risus nullam eget felis eget. Viverra "

      "orci sagittis eu volutpat odio facilisis mauris sit. Erat velit scelerisque in dictum non.";

  static const size_t len_lorem = strlen(lorem);

  size_t len;

  if (short_len) {

    len = os::random() % 10;

  } else {

    len = MAX2(1, (int)(os::random() % len_lorem));

  }

  st->write(lorem, len);

  return len;

}

static void do_test_stringStream_dynamic_realloc(bool short_len) {

  stringStream ss(2); // small buffer to force lots of reallocations.

  size_t written = 0;

  for (int i = 0; i < 1000; i ++) {

    written += print_lorem(&ss, short_len);

    ASSERT_EQ(ss.size(), written);

    // Internal buffer should always be zero-terminated.

    ASSERT_EQ(ss.base()[ss.size()], '\0');

  }

}

TEST_VM(ostream, stringStream_dynamic_realloc_1) {

  do_test_stringStream_dynamic_realloc(false);

}

TEST_VM(ostream, stringStream_dynamic_realloc_2) {

  do_test_stringStream_dynamic_realloc(true);

}