add implementation for localtime_r for baremetal

Author: zimirza

libc/src/time/baremetal/localtime_r.cpp

@@ -0,0 +1,22 @@
+//===-- Implementation of localtime_r for baremetal -----------------------===//
+//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
+//
+//===----------------------------------------------------------------------===//
+
+#include "src/time/localtime_r.h"
+
+namespace LIBC_NAMESPACE_DECL {
+
+LLVM_LIBC_FUNCTION(struct tm *, localtime_r,
+                   (const time_t *timer, struct tm *buf)) {
+  if (timer == nullptr) {
+    return nullptr;
+  }
+
+  return time_utils::localtime_internal(timer, buf);
+}
+
+} // namespace LIBC_NAMESPACE_DECL