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/kernel_release.h> 21 22 namespace android::kver { 23 24 #define KERNEL_RELEASE_PRINT_FORMAT \ 25 "%" PRIu64 ".%" PRIu64 ".%" PRIu64 "-android%" PRIu64 "-%" PRIu64 26 #define KERNEL_RELEASE_SCAN_FORMAT KERNEL_RELEASE_PRINT_FORMAT "%n" 27 28 // Not taking a string_view because sscanf requires null-termination. 29 std::optional<KernelRelease> KernelRelease::Parse(const std::string& s, bool allow_suffix) { 30 if (s.size() > std::numeric_limits<int>::max()) return std::nullopt; 31 int nchars = -1; 32 KernelRelease ret; 33 auto scan_res = sscanf(s.c_str(), KERNEL_RELEASE_SCAN_FORMAT, &ret.kmi_version_.version_, 34 &ret.kmi_version_.patch_level_, &ret.sub_level_, 35 &ret.kmi_version_.release_, &ret.kmi_version_.gen_, &nchars); 36 if (scan_res != 5) return std::nullopt; 37 if (nchars < 0) return std::nullopt; 38 // If !allow_suffix, ensure the whole string is consumed. 39 if (!allow_suffix && nchars != s.size()) return std::nullopt; 40 return ret; 41 } 42 43 std::string KernelRelease::string() const { 44 return android::base::StringPrintf(KERNEL_RELEASE_PRINT_FORMAT, version(), patch_level(), 45 sub_level(), android_release(), generation()); 46 } 47 48 std::tuple<uint64_t, uint64_t, uint64_t> KernelRelease::kernel_version_tuple() const { 49 return std::make_tuple(version(), patch_level(), sub_level()); 50 } 51 52 } // namespace android::kver 53