Add include guards and header comments to sources

4 files changed, 28 insertions, 0 deletions

diff --git a/src/core/utils/epoch.cc b/src/core/utils/epoch.cc
index 36bdb79..9d66399 100644
--- a/src/core/utils/epoch.cc
+++ b/src/core/utils/epoch.cc
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: BSD-2-Clause
+// Copyright (c) 2025 Kirill Dmitrievich
+// File: epoch.cc
+// Description: UNIX time utilities
+
 #include "core/pch.hh"
 
 #include "core/utils/epoch.hh"
diff --git a/src/core/utils/epoch.hh b/src/core/utils/epoch.hh
index 4bf5460..5210e22 100644
--- a/src/core/utils/epoch.hh
+++ b/src/core/utils/epoch.hh
@@ -1,3 +1,10 @@
+// SPDX-License-Identifier: BSD-2-Clause
+// Copyright (c) 2025 Kirill Dmitrievich
+// File: epoch.hh
+// Description: UNIX time utilities
+
+#ifndef CORE_UTILS_EPOCH_HH
+#define CORE_UTILS_EPOCH_HH
 #pragma once
 
 namespace utils
@@ -13,3 +20,5 @@ std::int64_t signed_unix_seconds(void);
 std::int64_t signed_unix_milliseconds(void);
 std::int64_t signed_unix_microseconds(void);
 } // namespace utils
+
+#endif
diff --git a/src/core/utils/string.cc b/src/core/utils/string.cc
index dd3d567..154b04b 100644
--- a/src/core/utils/string.cc
+++ b/src/core/utils/string.cc
@@ -1,3 +1,8 @@
+// SPDX-License-Identifier: BSD-2-Clause
+// Copyright (c) 2025 Kirill Dmitrievich
+// File: string.cc
+// Description: String utilities
+
 #include "core/pch.hh"
 
 #include "core/utils/string.hh"
diff --git a/src/core/utils/string.hh b/src/core/utils/string.hh
index 827c3ca..36c83ce 100644
--- a/src/core/utils/string.hh
+++ b/src/core/utils/string.hh
@@ -1,3 +1,10 @@
+// SPDX-License-Identifier: BSD-2-Clause
+// Copyright (c) 2025 Kirill Dmitrievich
+// File: string.hh
+// Description: String utilities
+
+#ifndef CORE_UTILS_STRING_HH
+#define CORE_UTILS_STRING_HH
 #pragma once
 
 namespace utils
@@ -15,3 +22,5 @@ namespace utils
 {
 std::string trim_whitespace(const std::string& string);
 } // namespace utils
+
+#endif