Merge "libbase: add parsedouble.h." am: d5570579 am: de3e6004

        "errors_test.cpp",

        "file_test.cpp",

        "logging_test.cpp",

        "parsedouble_test.cpp",

        "parseint_test.cpp",

        "parsenetaddress_test.cpp",

        "quick_exit_test.cpp",

/*

 * Copyright (C) 2016 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#ifndef ANDROID_BASE_PARSEDOUBLE_H

#define ANDROID_BASE_PARSEDOUBLE_H

#include <errno.h>

#include <stdlib.h>

#include <limits>

namespace android {

namespace base {

// Parse double value in the string 's' and sets 'out' to that value.

// Optionally allows the caller to define a 'min' and 'max' beyond which

// otherwise valid values will be rejected. Returns boolean success.

static inline bool ParseDouble(const char* s, double* out,

                               double min = std::numeric_limits<double>::lowest(),

                               double max = std::numeric_limits<double>::max()) {

  errno = 0;

  char* end;

  double result = strtod(s, &end);

  if (errno != 0 || s == end || *end != '\0') {

    return false;

  }

  if (result < min || max < result) {

    return false;

  }

  *out = result;

  return true;

}

}  // namespace base

}  // namespace android

#endif  // ANDROID_BASE_PARSEDOUBLE_H

/*

 * Copyright (C) 2016 The Android Open Source Project

 *

 * Licensed under the Apache License, Version 2.0 (the "License");

 * you may not use this file except in compliance with the License.

 * You may obtain a copy of the License at

 *

 *      http://www.apache.org/licenses/LICENSE-2.0

 *

 * Unless required by applicable law or agreed to in writing, software

 * distributed under the License is distributed on an "AS IS" BASIS,

 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 * See the License for the specific language governing permissions and

 * limitations under the License.

 */

#include "android-base/parsedouble.h"

#include <gtest/gtest.h>

TEST(parsedouble, smoke) {

  double d;

  ASSERT_FALSE(android::base::ParseDouble("", &d));

  ASSERT_FALSE(android::base::ParseDouble("x", &d));

  ASSERT_FALSE(android::base::ParseDouble("123.4x", &d));

  ASSERT_TRUE(android::base::ParseDouble("123.4", &d));

  ASSERT_DOUBLE_EQ(123.4, d);

  ASSERT_TRUE(android::base::ParseDouble("-123.4", &d));

  ASSERT_DOUBLE_EQ(-123.4, d);

  ASSERT_TRUE(android::base::ParseDouble("0", &d, 0.0));

  ASSERT_DOUBLE_EQ(0.0, d);

  ASSERT_FALSE(android::base::ParseDouble("0", &d, 1e-9));

  ASSERT_FALSE(android::base::ParseDouble("3.0", &d, -1.0, 2.0));

  ASSERT_TRUE(android::base::ParseDouble("1.0", &d, 0.0, 2.0));

  ASSERT_DOUBLE_EQ(1.0, d);

}