| // Copyright 2018 The Chromium 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 <windows.h> |
| |
| #include <stdarg.h> |
| #include <stdio.h> |
| |
| #include <string> |
| |
| #include "base/cxx17_backports.h" |
| |
| #if !defined(NDEBUG) |
| // Sends string |format| to the debugger for display. |
| // |
| // This is for developers only; we don't use this in circumstances |
| // (like release builds) where users could see it. |
| void TraceImpl(const wchar_t* format, ...) { |
| constexpr int kMaxLogBufferSize = 1024; |
| wchar_t buffer[kMaxLogBufferSize] = {}; |
| |
| va_list args = {}; |
| |
| va_start(args, format); |
| if (vswprintf(buffer, base::size(buffer), format, args) > 0) { |
| OutputDebugString(buffer); |
| } else { |
| std::wstring error_string(L"Format error for string: "); |
| OutputDebugString(error_string.append(format).c_str()); |
| } |
| va_end(args); |
| } |
| #endif // !defined(NDEBUG) |
