Update vendored utfcpp library to commit ad27c7d5e0.

1 files changed, 13 insertions, 16 deletions

diff --git a/vendor/utfcpp/utf8/checked.h b/vendor/utfcpp/utf8/checked.h
index 2aef5838d..c31861e0a 100644
--- a/vendor/utfcpp/utf8/checked.h
+++ b/vendor/utfcpp/utf8/checked.h
@@ -107,7 +107,9 @@ namespace utf8
                         *out++ = *it;
                     break;
                 case internal::NOT_ENOUGH_ROOM:
-                    throw not_enough_room();
+                    out = utf8::append (replacement, out);
+                    start = end;
+                    break;
                 case internal::INVALID_LEAD:
                     out = utf8::append (replacement, out);
                     ++start;
@@ -174,23 +176,19 @@ namespace utf8
         return utf8::peek_next(it, end);
     }
 
-    /// Deprecated in versions that include "prior"
-    template <typename octet_iterator>
-    uint32_t previous(octet_iterator& it, octet_iterator pass_start)
-    {
-        octet_iterator end = it;
-        while (utf8::internal::is_trail(*(--it)))
-            if (it == pass_start)
-                throw invalid_utf8(*it); // error - no lead byte in the sequence
-        octet_iterator temp = it;
-        return utf8::next(temp, end);
-    }
-
     template <typename octet_iterator, typename distance_type>
     void advance (octet_iterator& it, distance_type n, octet_iterator end)
     {
-        for (distance_type i = 0; i < n; ++i)
-            utf8::next(it, end);
+        const distance_type zero(0);
+        if (n < zero) {
+            // backward
+            for (distance_type i = n; i < zero; ++i)
+                utf8::prior(it, end);
+        } else {
+            // forward
+            for (distance_type i = zero; i < n; ++i)
+                utf8::next(it, end);
+        }
     }
 
     template <typename octet_iterator>
@@ -324,4 +322,3 @@ namespace utf8
 
 #endif //header guard
 
-