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37 lines
926 B
C++
37 lines
926 B
C++
// Copyright 2013 The Chromium Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#include "mojo/edk/system/test/random.h"
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#include <stdint.h>
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#include <limits>
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#include "base/logging.h"
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namespace mojo {
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namespace system {
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namespace test {
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// TODO(vtl): Replace all of this implementation with suitable use of C++11
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// <random> when we can.
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int RandomInt(int min, int max) {
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DCHECK_LE(min, max);
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DCHECK_LE(static_cast<int64_t>(max) - min, RAND_MAX);
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DCHECK_LT(static_cast<int64_t>(max) - min, std::numeric_limits<int>::max());
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// This is in-range for an |int| due to the above.
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int range = max - min + 1;
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int max_valid = (RAND_MAX / range) * range - 1;
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int value;
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do {
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value = rand();
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} while (value > max_valid);
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return min + (value % range);
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}
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} // namespace test
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} // namespace system
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} // namespace mojo
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