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Yabin Cuiebe8eef2016-10-05 10:54:35 -07001/*
2 * Copyright (C) 2016 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 * http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17#ifndef ANDROID_BASE_PARSEDOUBLE_H
18#define ANDROID_BASE_PARSEDOUBLE_H
19
20#include <errno.h>
21#include <stdlib.h>
22
23#include <limits>
24
25namespace android {
26namespace base {
27
28// Parse double value in the string 's' and sets 'out' to that value.
29// Optionally allows the caller to define a 'min' and 'max' beyond which
30// otherwise valid values will be rejected. Returns boolean success.
31static inline bool ParseDouble(const char* s, double* out,
32 double min = std::numeric_limits<double>::lowest(),
33 double max = std::numeric_limits<double>::max()) {
34 errno = 0;
35 char* end;
36 double result = strtod(s, &end);
37 if (errno != 0 || s == end || *end != '\0') {
38 return false;
39 }
40 if (result < min || max < result) {
41 return false;
42 }
43 *out = result;
44 return true;
45}
46
47} // namespace base
48} // namespace android
49
50#endif // ANDROID_BASE_PARSEDOUBLE_H