Yabin Cui | ebe8eef | 2016-10-05 10:54:35 -0700 | [diff] [blame^] | 1 | /* |
| 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 | |
| 25 | namespace android { |
| 26 | namespace 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. |
| 31 | static 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 |