protobuf_text_format.patch

diff --git a/src/google/protobuf/text_format.cc b/src/google/protobuf/text_format.cc
index 2c0a95d..1234567 100644
--- a/src/google/protobuf/text_format.cc
+++ b/src/google/protobuf/text_format.cc
@@ -82,6 +82,18 @@ inline bool IsOctNumber(const std::string& str) {
           (str[1] >= '0' && str[1] < '8'));
 }

+// Returns true if truncation occurred.
+bool TruncateString(int64_t max_length, absl::string_view* s) {
+  if (max_length > 0) {
+    int64_t excess = static_cast<int64_t>(s->size()) - max_length;
+    if (excess > 0) {
+      s->remove_suffix(excess);
+      return true;
+    }
+  }
+  return false;
+}
+
 // The number of fields that are redacted in AbslStringify.
 std::atomic<int64_t> num_redacted_field{0};

@@ -2738,20 +2750,22 @@ void TextFormat::Printer::PrintFieldValue(const Message& message,
               ? reflection->GetRepeatedStringReference(message, field, index,
                                                        &scratch)
               : reflection->GetStringReference(message, field, &scratch);
-      const std::string* value_to_print = &value;
-      std::string truncated_value;
-      if (truncate_string_field_longer_than_ > 0 &&
-          static_cast<size_t>(truncate_string_field_longer_than_) <
-              value.size()) {
-        truncated_value = value.substr(0, truncate_string_field_longer_than_) +
-                          "...<truncated>...";
-        value_to_print = &truncated_value;
-      }
+      absl::string_view value_to_print(value);
+      bool truncated = TruncateString(truncate_string_field_longer_than_, &value_to_print);
+
       if (field->type() == FieldDescriptor::TYPE_STRING) {
-        printer->PrintString(*value_to_print, generator);
+        if (truncated) {
+          printer->PrintString(absl::StrCat(value_to_print, "...<truncated>..."), generator);
+        } else {
+          printer->PrintString(value, generator);
+        }
       } else {
         ABSL_DCHECK_EQ(field->type(), FieldDescriptor::TYPE_BYTES);
-        printer->PrintBytes(*value_to_print, generator);
+        if (truncated) {
+          printer->PrintBytes(absl::StrCat(value_to_print, "...<truncated>..."), generator);
+        } else {
+          printer->PrintBytes(value, generator);
+        }
       }
       break;
     }
@@ -2937,7 +2951,14 @@ void TextFormat::Printer::PrintUnknownFields(
             break;
           }
           generator->PrintMaybeWithMarker(MarkerToken(), ": ", "\"");
-          generator->PrintString(absl::CEscape(value));
+          absl::string_view value_to_print(value);
+          bool truncated = TruncateString(truncate_string_field_longer_than_, &value_to_print);
+
+          if (truncated) {
+            generator->PrintString(absl::StrCat(absl::CEscape(value_to_print), "...<truncated>..."));
+          } else {
+            generator->PrintString(absl::CEscape(value));
+          }
           if (single_line_mode_) {
             generator->PrintLiteral("\" ");
           } else {