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 51