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diff --git a/src/base/is_utf8.hh b/src/base/is_utf8.hh
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+/*
+ * is_utf8 is distributed under the following terms:
+ *
+ * Copyright (c) 2013 Palard Julien. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ *     modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *     notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *     notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ifndef _IS_UTF8_H
+#define _IS_UTF8_H
+
+#include <stdlib.h>
+#include <sys/types.h>
+
+#include "intern_string.hh"
+#include "optional.hpp"
+
+struct utf8_scan_result {
+    const char* usr_message{nullptr};
+    size_t usr_faulty_bytes{0};
+    string_fragment usr_valid_frag{string_fragment::invalid()};
+    nonstd::optional<string_fragment> usr_remaining;
+    bool usr_has_ansi{false};
+
+    const char* remaining_ptr(const string_fragment& frag) const
+    {
+        if (this->usr_remaining) {
+            return this->usr_remaining->begin();
+        } else {
+            return nullptr;
+        }
+    }
+    bool is_valid() const { return this->usr_message == nullptr; }
+};
+
+utf8_scan_result is_utf8(string_fragment frag,
+                         nonstd::optional<unsigned char> terminator
+                         = nonstd::nullopt);
+
+#endif /* _IS_UTF8_H */