1 /* 2 * Copyright (C) 2015 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_PARSEINT_H 18 #define ANDROID_BASE_PARSEINT_H 19 20 #include <errno.h> 21 #include <stdlib.h> 22 23 #include <limits> 24 25 namespace android { 26 namespace base { 27 28 // Parses the unsigned decimal integer in the string 's' and sets 'out' to 29 // that value. Optionally allows the caller to define a 'max' beyond which 30 // otherwise valid values will be rejected. Returns boolean success. 31 template <typename T> 32 bool ParseUint(const char* s, T* out, 33 T max = std::numeric_limits<T>::max()) { 34 int base = (s[0] == '0' && s[1] == 'x') ? 16 : 10; 35 errno = 0; 36 char* end; 37 unsigned long long int result = strtoull(s, &end, base); 38 if (errno != 0 || s == end || *end != '\0') { 39 return false; 40 } 41 if (max < result) { 42 return false; 43 } 44 *out = static_cast<T>(result); 45 return true; 46 } 47 48 // Parses the signed decimal integer in the string 's' and sets 'out' to 49 // that value. Optionally allows the caller to define a 'min' and 'max 50 // beyond which otherwise valid values will be rejected. Returns boolean 51 // success. 52 template <typename T> 53 bool ParseInt(const char* s, T* out, 54 T min = std::numeric_limits<T>::min(), 55 T max = std::numeric_limits<T>::max()) { 56 int base = (s[0] == '0' && s[1] == 'x') ? 16 : 10; 57 errno = 0; 58 char* end; 59 long long int result = strtoll(s, &end, base); 60 if (errno != 0 || s == end || *end != '\0') { 61 return false; 62 } 63 if (result < min || max < result) { 64 return false; 65 } 66 *out = static_cast<T>(result); 67 return true; 68 } 69 70 } // namespace base 71 } // namespace android 72 73 #endif // ANDROID_BASE_PARSEINT_H 74
