regex-instance: HalInterface stores regex instances.
Parse <regex-instance> regular expression patterns using
Extended Regular Expression syntax, and store it in
HalInterface object.
Bug: 73738616
Test: libvintf_test
Test: vintf_object_test
Test: vts_treble_vintf_test
Change-Id: If0b8e3bc053a6c2ecd9048092071f52f7896bba0
Merged-In: If0b8e3bc053a6c2ecd9048092071f52f7896bba0
diff --git a/Regex.cpp b/Regex.cpp
new file mode 100644
index 0000000..c343398
--- /dev/null
+++ b/Regex.cpp
@@ -0,0 +1,51 @@
+/*
+ * Copyright (C) 2018 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "Regex.h"
+
+namespace android {
+namespace vintf {
+namespace details {
+
+Regex::~Regex() {
+ clear();
+}
+
+void Regex::clear() {
+ if (mImpl != nullptr) {
+ regfree(mImpl.get());
+ mImpl = nullptr;
+ }
+}
+
+bool Regex::compile(const std::string& pattern) {
+ clear();
+ mImpl = std::make_unique<regex_t>();
+ int status = regcomp(mImpl.get(), pattern.c_str(), REG_EXTENDED | REG_NEWLINE);
+ return status == 0;
+}
+
+bool Regex::matches(const std::string& s) const {
+ regmatch_t match;
+ int status =
+ regexec(mImpl.get(), s.c_str(), 1 /* nmatch */, &match /* pmatch */, 0 /* flags */);
+ return status == 0 && match.rm_so == 0 && match.rm_eo >= 0 &&
+ static_cast<size_t>(match.rm_eo) == s.length();
+}
+
+} // namespace details
+} // namespace vintf
+} // namespace android