Add benchmark for stumpless_open_buffer_target

CMakeLists.txt

@@ -1156,6 +1156,12 @@ add_performance_test(function
     $<TARGET_OBJECTS:test_helper_fixture>
 )
 
+add_performance_test(buffer
+  SOURCES
+    ${PROJECT_SOURCE_DIR}/test/performance/target/buffer.cpp
+    $<TARGET_OBJECTS:test_helper_fixture>
+)
+
 add_performance_test(log
   SOURCES test/performance/log.cpp
 )

test/performance/target/buffer.cpp

@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: Apache-2.0
+
+/*
+ * Copyright 2024 Joel E. Anderson
+ *
+ * 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 <benchmark/benchmark.h>
+#include <stumpless.h>
+#include "test/helper/memory_counter.hpp"
+#define MAX_BUFFER_SIZE (4ull * 1024ull) // 4 kB
+
+NEW_MEMORY_COUNTER( buffer );
+
+class BufferFixture : public::benchmark::Fixture {
+protected:
+  char buffer[MAX_BUFFER_SIZE];
+
+public:
+  void SetUp( const ::benchmark::State &state ) {
+    INIT_MEMORY_COUNTER( buffer );
+  }
+
+  void TearDown( const ::benchmark::State &state ) {
+    FINALIZE_MEMORY_COUNTER( buffer );
+    stumpless_free_all();
+  }
+};
+
+BENCHMARK_F( BufferFixture, OpenBufferTarget )( benchmark::State &state ) {
+  for( auto _ : state ) {
+    struct stumpless_target *target = stumpless_open_buffer_target( "buffer-perf",
+                                                                    buffer,
+                                                                    sizeof( buffer ) );
+    if( !target ) {
+      state.SkipWithError( "could not open buffer target" );
+    }
+    stumpless_close_buffer_target( target );
+  }
+
+  SET_STATE_COUNTERS( state, buffer );
+}