Address a bunch of clang-tidy complaints.

There were a bunch more unreasonable/incorrect ones, but these ones
seemed legit. Nothing very interesting, though.

Bug: N/A
Test: ran tests, benchmarks
Change-Id: If66971194d4a7b4bf6d0251bedb88e8cdc88a76f

3 files changed, 7 insertions, 7 deletions

diff --git a/benchmarks/bionic_benchmarks.cpp b/benchmarks/bionic_benchmarks.cpp
index fe7a1b13e..d8635cda4 100644
--- a/benchmarks/bionic_benchmarks.cpp
+++ b/benchmarks/bionic_benchmarks.cpp
@@ -305,7 +305,7 @@ args_vector_t* ResolveArgs(args_vector_t* to_populate, std::string args,
 }
 
 void RegisterGoogleBenchmarks(bench_opts_t primary_opts, bench_opts_t secondary_opts,
-                         std::string fn_name, args_vector_t* run_args) {
+                              const std::string& fn_name, args_vector_t* run_args) {
   if (g_str_to_func.find(fn_name) == g_str_to_func.end()) {
     errx(1, "ERROR: No benchmark for function %s", fn_name.c_str());
   }
@@ -320,7 +320,7 @@ void RegisterGoogleBenchmarks(bench_opts_t primary_opts, bench_opts_t secondary_
   }
 
   benchmark_func_t benchmark_function = g_str_to_func.at(fn_name).first;
-  for (std::vector<int> args : (*run_args)) {
+  for (const std::vector<int>& args : (*run_args)) {
     auto registration = benchmark::RegisterBenchmark(fn_name.c_str(), LockAndRun,
                                                      benchmark_function,
                                                      cpu_to_use)->Args(args);
@@ -335,13 +335,13 @@ void RegisterCliBenchmarks(bench_opts_t cmdline_opts,
   // Register any of the extra benchmarks that were specified in the options.
   args_vector_t arg_vector;
   args_vector_t* run_args = &arg_vector;
-  for (std::string extra_fn : cmdline_opts.extra_benchmarks) {
+  for (const std::string& extra_fn : cmdline_opts.extra_benchmarks) {
     android::base::Trim(extra_fn);
-    size_t first_space_pos = extra_fn.find(" ");
+    size_t first_space_pos = extra_fn.find(' ');
     std::string fn_name = extra_fn.substr(0, first_space_pos);
     std::string cmd_args;
     if (first_space_pos != std::string::npos) {
-      cmd_args = extra_fn.substr(extra_fn.find(" ") + 1);
+      cmd_args = extra_fn.substr(extra_fn.find(' ') + 1);
     } else {
       cmd_args = "";
     }
diff --git a/benchmarks/stdio_benchmark.cpp b/benchmarks/stdio_benchmark.cpp
index 965a3ae9f..9c81e0fc0 100644
--- a/benchmarks/stdio_benchmark.cpp
+++ b/benchmarks/stdio_benchmark.cpp
@@ -29,7 +29,7 @@ static void FillFile(TemporaryFile& tf) {
   memset(line, 'x', sizeof(line));
   line[sizeof(line) - 1] = '\0';
 
-  FILE* fp = fopen(tf.path, "w");
+  FILE* fp = fopen(tf.path, "we");
   for (size_t i = 0; i < 4096; ++i) fputs(line, fp);
   fclose(fp);
 }
diff --git a/benchmarks/util.h b/benchmarks/util.h
index a54676416..3225bc298 100644
--- a/benchmarks/util.h
+++ b/benchmarks/util.h
@@ -29,7 +29,7 @@ extern std::mutex g_map_lock;
 
 extern std::map<std::string, std::pair<benchmark_func_t, std::string>> g_str_to_func;
 
-static int  __attribute__((unused)) EmplaceBenchmark (std::string fn_name, benchmark_func_t fn_ptr, std::string arg = "") {
+static int  __attribute__((unused)) EmplaceBenchmark(const std::string& fn_name, benchmark_func_t fn_ptr, const std::string& arg = "") {
   g_map_lock.lock();
   g_str_to_func.emplace(std::string(fn_name), std::make_pair(fn_ptr, arg));
   g_map_lock.unlock();