Martin Stjernholm | c15e7e4 | 2020-12-02 22:50:53 +0000 | [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 | #pragma once |
| 18 | |
| 19 | #include <errno.h> |
| 20 | #include <stdlib.h> |
| 21 | |
| 22 | #include <limits> |
| 23 | #include <string> |
| 24 | |
| 25 | namespace android { |
| 26 | namespace base { |
| 27 | |
| 28 | // Parse floating value in the string 's' and sets 'out' to that value if it exists. |
| 29 | // Optionally allows the caller to define a 'min' and 'max' beyond which |
| 30 | // otherwise valid values will be rejected. Returns boolean success. |
| 31 | template <typename T, T (*strtox)(const char* str, char** endptr)> |
| 32 | static inline bool ParseFloatingPoint(const char* s, T* out, T min, T max) { |
| 33 | errno = 0; |
| 34 | char* end; |
| 35 | T result = strtox(s, &end); |
| 36 | if (errno != 0 || s == end || *end != '\0') { |
| 37 | return false; |
| 38 | } |
| 39 | if (result < min || max < result) { |
| 40 | return false; |
| 41 | } |
| 42 | if (out != nullptr) { |
| 43 | *out = result; |
| 44 | } |
| 45 | return true; |
| 46 | } |
| 47 | |
| 48 | // Parse double value in the string 's' and sets 'out' to that value if it exists. |
| 49 | // Optionally allows the caller to define a 'min' and 'max' beyond which |
| 50 | // otherwise valid values will be rejected. Returns boolean success. |
| 51 | static inline bool ParseDouble(const char* s, double* out, |
| 52 | double min = std::numeric_limits<double>::lowest(), |
| 53 | double max = std::numeric_limits<double>::max()) { |
| 54 | return ParseFloatingPoint<double, strtod>(s, out, min, max); |
| 55 | } |
| 56 | static inline bool ParseDouble(const std::string& s, double* out, |
| 57 | double min = std::numeric_limits<double>::lowest(), |
| 58 | double max = std::numeric_limits<double>::max()) { |
| 59 | return ParseFloatingPoint<double, strtod>(s.c_str(), out, min, max); |
| 60 | } |
| 61 | |
| 62 | // Parse float value in the string 's' and sets 'out' to that value if it exists. |
| 63 | // Optionally allows the caller to define a 'min' and 'max' beyond which |
| 64 | // otherwise valid values will be rejected. Returns boolean success. |
| 65 | static inline bool ParseFloat(const char* s, float* out, |
| 66 | float min = std::numeric_limits<float>::lowest(), |
| 67 | float max = std::numeric_limits<float>::max()) { |
| 68 | return ParseFloatingPoint<float, strtof>(s, out, min, max); |
| 69 | } |
| 70 | static inline bool ParseFloat(const std::string& s, float* out, |
| 71 | float min = std::numeric_limits<float>::lowest(), |
| 72 | float max = std::numeric_limits<float>::max()) { |
| 73 | return ParseFloatingPoint<float, strtof>(s.c_str(), out, min, max); |
| 74 | } |
| 75 | |
| 76 | } // namespace base |
| 77 | } // namespace android |