log.cc

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// Copyright 2013 The Flutter Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
 
#include "tonic/common/log.h"
 
#include <cstdarg>
#include <cstdio>
#include <memory>
 
namespace tonic {
 
namespace {
 
std::function<void(const char*)> log_handler;
 
}  // namespace
 
void Log(const char* format, ...) {
  va_list ap;
  va_start(ap, format);
  int result = vsnprintf(nullptr, 0, format, ap);
  va_end(ap);
 
  if (result < 0) {
    return;
  }
 
  int size = result + 1;
  std::unique_ptr<char[]> message = std::make_unique<char[]>(size);
  va_start(ap, format);
  result = vsnprintf(message.get(), size, format, ap);
  va_end(ap);
 
  if (result < 0) {
    return;
  }
 
  if (log_handler) {
    log_handler(message.get());
  } else {
    printf("%s\n", message.get());
  }
}
 
void SetLogHandler(std::function<void(const char*)> handler) {
  log_handler = handler;
}
 
}  // namespace tonic