From 4f4bc07f41bf0ebc1a97da097cbddf5fdf6531bf Mon Sep 17 00:00:00 2001
From: Peter Powell <petpow@saberuk.com>
Date: Fri, 2 Aug 2019 12:52:22 +0100
Subject: Update vendored utfcpp to v3.1.

---
 vendor/README.md               |  2 +-
 vendor/utfcpp/utf8/unchecked.h | 42 +++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 42 insertions(+), 2 deletions(-)

diff --git a/vendor/README.md b/vendor/README.md
index a97e99c18..9d148c7b3 100644
--- a/vendor/README.md
+++ b/vendor/README.md
@@ -36,7 +36,7 @@ This directory contains vendored dependencies that are shipped with InspIRCd to
 
 **Author** &mdash; Nemanja Trifunovic
 
-**Last Updated** &mdash; 2019-04-25 (ad27c7d5e0e5b4c3baca4a2e70c0336b68c0dffb)
+**Last Updated** &mdash; 2019-08-02 (v3.1)
 
 **License** &mdash; Boost Software License
 
diff --git a/vendor/utfcpp/utf8/unchecked.h b/vendor/utfcpp/utf8/unchecked.h
index c78419f69..def000997 100644
--- a/vendor/utfcpp/utf8/unchecked.h
+++ b/vendor/utfcpp/utf8/unchecked.h
@@ -32,7 +32,7 @@ DEALINGS IN THE SOFTWARE.
 
 namespace utf8
 {
-    namespace unchecked 
+    namespace unchecked
     {
         template <typename octet_iterator>
         octet_iterator append(uint32_t cp, octet_iterator result)
@@ -57,6 +57,46 @@ namespace utf8
             return result;
         }
 
+        template <typename octet_iterator, typename output_iterator>
+        output_iterator replace_invalid(octet_iterator start, octet_iterator end, output_iterator out, uint32_t replacement)
+        {
+            while (start != end) {
+                octet_iterator sequence_start = start;
+                internal::utf_error err_code = utf8::internal::validate_next(start, end);
+                switch (err_code) {
+                    case internal::UTF8_OK :
+                        for (octet_iterator it = sequence_start; it != start; ++it)
+                            *out++ = *it;
+                        break;
+                    case internal::NOT_ENOUGH_ROOM:
+                        out = utf8::unchecked::append (replacement, out);
+                        start = end;
+                        break;
+                    case internal::INVALID_LEAD:
+                        out = utf8::unchecked::append (replacement, out);
+                        ++start;
+                        break;
+                    case internal::INCOMPLETE_SEQUENCE:
+                    case internal::OVERLONG_SEQUENCE:
+                    case internal::INVALID_CODE_POINT:
+                        out = utf8::unchecked::append (replacement, out);
+                        ++start;
+                        // just one replacement mark for the sequence
+                        while (start != end && utf8::internal::is_trail(*start))
+                            ++start;
+                        break;
+                }
+            }
+            return out;
+        }
+
+        template <typename octet_iterator, typename output_iterator>
+        inline output_iterator replace_invalid(octet_iterator start, octet_iterator end, output_iterator out)
+        {
+            static const uint32_t replacement_marker = utf8::internal::mask16(0xfffd);
+            return utf8::unchecked::replace_invalid(start, end, out, replacement_marker);
+        }
+
         template <typename octet_iterator>
         uint32_t next(octet_iterator& it)
         {
-- 
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