1 // 2 // Copyright (C) 2020 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 #include <inttypes.h> 18 19 #include <android-base/stringprintf.h> 20 #include <kver/kmi_version.h> 21 22 namespace android::kver { 23 24 #define KMI_VERSION_PRINT_FORMAT "%" PRIu64 ".%" PRIu64 "-android%" PRIu64 "-%" PRIu64 25 #define KMI_VERSION_SCAN_FORMAT KMI_VERSION_PRINT_FORMAT "%n" 26 27 // Not taking a string_view because sscanf requires null-termination. 28 std::optional<KmiVersion> KmiVersion::Parse(const std::string& s) { 29 if (s.size() > std::numeric_limits<int>::max()) return std::nullopt; 30 int nchars = -1; 31 KmiVersion ret; 32 auto scan_res = sscanf(s.c_str(), KMI_VERSION_SCAN_FORMAT, &ret.version_, &ret.patch_level_, 33 &ret.release_, &ret.gen_, &nchars); 34 if (scan_res != 4) return std::nullopt; 35 if (nchars < 0) return std::nullopt; 36 // Ensure the whole string is consumed. 37 if (nchars != s.size()) return std::nullopt; 38 return ret; 39 } 40 41 std::string KmiVersion::string() const { 42 return android::base::StringPrintf(KMI_VERSION_PRINT_FORMAT, version(), patch_level(), 43 android_release(), generation()); 44 } 45 46 std::tuple<uint64_t, uint64_t, uint64_t, uint64_t> KmiVersion::tuple() const { 47 return std::make_tuple(version(), patch_level(), android_release(), generation()); 48 } 49 50 } // namespace android::kver 51