Method printf

lib/cpp/src/thrift/TOutput.cpp:36–89

TOutput::TOutput() : f_(&errorTimeWrapper) {}

void TOutput::printf(const char* message, ...) {
#ifndef THRIFT_SQUELCH_CONSOLE_OUTPUT
  // Try to reduce heap usage, even if printf is called rarely.
  static const int STACK_BUF_SIZE = 256;
  char stack_buf[STACK_BUF_SIZE];
  va_list ap;

#ifdef _MSC_VER
  va_start(ap, message);
  int need = _vscprintf(message, ap);
  va_end(ap);

  if (need < STACK_BUF_SIZE) {
    va_start(ap, message);
    vsnprintf_s(stack_buf, STACK_BUF_SIZE, _TRUNCATE, message, ap);
    va_end(ap);
    f_(stack_buf);
    return;
  }
#else
  va_start(ap, message);
  int need = vsnprintf(stack_buf, STACK_BUF_SIZE, message, ap);
  va_end(ap);

  if (need < STACK_BUF_SIZE) {
    f_(stack_buf);
    return;
  }
#endif

  char* heap_buf = (char*)malloc((need + 1) * sizeof(char));
  if (heap_buf == nullptr) {
#ifdef _MSC_VER
    va_start(ap, message);
    vsnprintf_s(stack_buf, STACK_BUF_SIZE, _TRUNCATE, message, ap);
    va_end(ap);
#endif
    // Malloc failed.  We might as well print the stack buffer.
    f_(stack_buf);
    return;
  }

  va_start(ap, message);
  int rval = vsnprintf(heap_buf, need + 1, message, ap);
  va_end(ap);
  // TODO(shigin): inform user
  if (rval != -1) {
    f_(heap_buf);
  }
  free(heap_buf);
#else
  THRIFT_UNUSED_VARIABLE(message);
#endif
}

void TOutput::errorTimeWrapper(const char* msg) {
#ifndef THRIFT_SQUELCH_CONSOLE_OUTPUT