src: remove NODE_INVALID_UTF8 environment variable

Introduced in joyent/node v0.10 as a backwards compatibility measure.
It's an ugly hack and allowing invalid UTF-8 is not a good idea in the
first place, remove it.

PR-URL: #1042
Reviewed-By: Trevor Norris <trev.norris@gmail.com>

src/node.cc

@@ -139,9 +139,6 @@ static uv_async_t dispatch_debug_messages_async;
 
 static Isolate* node_isolate = nullptr;
 
-int WRITE_UTF8_FLAGS = v8::String::HINT_MANY_WRITES_EXPECTED |
-                       v8::String::NO_NULL_TERMINATION;
-
 class ArrayBufferAllocator : public ArrayBuffer::Allocator {
  public:
   // Impose an upper limit to avoid out of memory errors that bring down
@@ -3819,11 +3816,6 @@ static void StartNodeInstance(void* arg) {
 int Start(int argc, char** argv) {
   PlatformInit();
 
-  const char* replace_invalid = secure_getenv("NODE_INVALID_UTF8");
-
-  if (replace_invalid == nullptr)
-    WRITE_UTF8_FLAGS |= String::REPLACE_INVALID_UTF8;
-
   CHECK_GT(argc, 0);
 
   // Hack around with the argv pointer. Used for process.title = "blah".

src/string_bytes.cc

@@ -287,8 +287,9 @@ size_t StringBytes::Write(Isolate* isolate,
   Local<String> str = val.As<String>();
   len = len < buflen ? len : buflen;
 
-  int flags = String::NO_NULL_TERMINATION |
-              String::HINT_MANY_WRITES_EXPECTED;
+  int flags = String::HINT_MANY_WRITES_EXPECTED |
+              String::NO_NULL_TERMINATION |
+              String::REPLACE_INVALID_UTF8;
 
   switch (encoding) {
     case ASCII:
@@ -311,7 +312,7 @@ size_t StringBytes::Write(Isolate* isolate,
         // well?
         memcpy(buf, data, len);
       else
-        len = str->WriteUtf8(buf, buflen, chars_written, WRITE_UTF8_FLAGS);
+        len = str->WriteUtf8(buf, buflen, chars_written, flags);
       break;
 
     case UCS2:

src/string_bytes.h

@@ -10,8 +10,6 @@
 
 namespace node {
 
-extern int WRITE_UTF8_FLAGS;
-
 class StringBytes {
  public:
   class InlineDecoder {

src/util.cc

@@ -23,12 +23,9 @@ Utf8Value::Utf8Value(v8::Isolate* isolate, v8::Handle<v8::Value> value)
     str = str_st_;
   CHECK_NE(str, NULL);
 
-  int flags = WRITE_UTF8_FLAGS;
-
-  length_ = val_->WriteUtf8(str,
-                            len,
-                            0,
-                            flags);
+  const int flags =
+      v8::String::NO_NULL_TERMINATION | v8::String::REPLACE_INVALID_UTF8;
+  length_ = val_->WriteUtf8(str, len, 0, flags);
   str[length_] = '\0';
 
   str_ = reinterpret_cast<char*>(str);