upload android base code part3

android/build/kati/stringprintf.cc

@@ -0,0 +1,39 @@
+// Copyright 2015 Google Inc. All rights reserved
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// +build ignore
+
+#include "stringprintf.h"
+
+#include <assert.h>
+#include <stdarg.h>
+
+string StringPrintf(const char* format, ...) {
+  string str;
+  str.resize(128);
+  for (int i = 0; i < 2; i++) {
+    va_list args;
+    va_start(args, format);
+    int ret = vsnprintf(&str[0], str.size(), format, args);
+    va_end(args);
+    assert(ret >= 0);
+    if (static_cast<size_t>(ret) < str.size()) {
+      str.resize(ret);
+      return str;
+    }
+    str.resize(ret + 1);
+  }
+  assert(false);
+  __builtin_unreachable();
+}