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90 lines
2.7 KiB
90 lines
2.7 KiB
/* |
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* Copyright (C) 2015 The Android Open Source Project |
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* |
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* Licensed under the Apache License, Version 2.0 (the "License"); |
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* you may not use this file except in compliance with the License. |
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* You may obtain a copy of the License at |
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* |
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* http://www.apache.org/licenses/LICENSE-2.0 |
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* |
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* Unless required by applicable law or agreed to in writing, software |
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* distributed under the License is distributed on an "AS IS" BASIS, |
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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* See the License for the specific language governing permissions and |
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* limitations under the License. |
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*/ |
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#ifndef ANDROID_BASE_PARSEINT_H |
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#define ANDROID_BASE_PARSEINT_H |
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#include <errno.h> |
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#include <stdlib.h> |
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#include <limits> |
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#include <string> |
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namespace android { |
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namespace base { |
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// Parses the unsigned decimal integer in the string 's' and sets 'out' to |
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// that value. Optionally allows the caller to define a 'max' beyond which |
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// otherwise valid values will be rejected. Returns boolean success; 'out' |
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// is untouched if parsing fails. |
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template <typename T> |
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bool ParseUint(const char* s, T* out, |
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T max = std::numeric_limits<T>::max()) { |
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int base = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')) ? 16 : 10; |
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errno = 0; |
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char* end; |
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unsigned long long int result = strtoull(s, &end, base); |
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if (errno != 0 || s == end || *end != '\0') { |
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return false; |
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} |
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if (max < result) { |
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return false; |
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} |
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*out = static_cast<T>(result); |
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return true; |
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} |
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// TODO: string_view |
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template <typename T> |
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bool ParseUint(const std::string& s, T* out, |
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T max = std::numeric_limits<T>::max()) { |
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return ParseUint(s.c_str(), out, max); |
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} |
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// Parses the signed decimal integer in the string 's' and sets 'out' to |
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// that value. Optionally allows the caller to define a 'min' and 'max |
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// beyond which otherwise valid values will be rejected. Returns boolean |
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// success; 'out' is untouched if parsing fails. |
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template <typename T> |
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bool ParseInt(const char* s, T* out, |
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T min = std::numeric_limits<T>::min(), |
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T max = std::numeric_limits<T>::max()) { |
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int base = (s[0] == '0' && (s[1] == 'x' || s[1] == 'X')) ? 16 : 10; |
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errno = 0; |
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char* end; |
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long long int result = strtoll(s, &end, base); |
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if (errno != 0 || s == end || *end != '\0') { |
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return false; |
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} |
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if (result < min || max < result) { |
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return false; |
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} |
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*out = static_cast<T>(result); |
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return true; |
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} |
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// TODO: string_view |
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template <typename T> |
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bool ParseInt(const std::string& s, T* out, |
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T min = std::numeric_limits<T>::min(), |
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T max = std::numeric_limits<T>::max()) { |
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return ParseInt(s.c_str(), out, min, max); |
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} |
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} // namespace base |
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} // namespace android |
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#endif // ANDROID_BASE_PARSEINT_H
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