Uses SNPRINT macro where possible. Otherwise uses #define for format.

runtime/vm/isolate.cc

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #include "vm/isolate.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/json.h"
 #include "vm/code_observers.h"
@@ skipping 878 matching lines @@
 void Isolate::BuildName(const char* name_prefix) {
   ASSERT(name_ == NULL);
   if (name_prefix == NULL) {
     name_prefix = "isolate";
   }
   set_debugger_name(name_prefix);
   if (ServiceIsolate::NameEquals(name_prefix)) {
     name_ = strdup(name_prefix);
     return;
   }
-  const char* kFormat = "%s-%lld";
-  intptr_t len = OS::SNPrint(NULL, 0, kFormat, name_prefix, main_port()) + 1;
-  name_ = reinterpret_cast<char*>(malloc(len));
-  OS::SNPrint(name_, len, kFormat, name_prefix, main_port());
+  name_ = OS::SCreate(NULL, "%s-%" Pd64 "", name_prefix, main_port());
 }
 
 
 // TODO(5411455): Use flag to override default value and Validate the
 // stack size by querying OS.
 uword Isolate::GetSpecifiedStackSize() {
   ASSERT(Isolate::kStackSizeBuffer < OSThread::GetMaxStackSize());
   uword stack_size = OSThread::GetMaxStackSize() - Isolate::kStackSizeBuffer;
   return stack_size;
 }
@@ skipping 1439 matching lines @@
                            serialized_message_, serialized_message_len_);
 }
 
 
 void IsolateSpawnState::Cleanup() {
   SwitchIsolateScope switch_scope(I);
   Dart::ShutdownIsolate();
 }
 
 }  // namespace dart