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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at */
#ifndef mozilla_glue_Debug_h
#define mozilla_glue_Debug_h
/* This header file intends to supply debugging utilities for use in code
* that cannot use XPCOM debugging facilities like nsDebug.h.
* e.g. mozglue, browser/app
* NB: printf_stderr() is in the global namespace, so include this file with
* care; avoid including from header files.
#include <io.h>
#if defined(XP_WIN)
# include <windows.h>
#endif // defined(XP_WIN)
#include "mozilla/Attributes.h"
#include "mozilla/Sprintf.h"
# error Do not include this file from XUL sources.
// Though this is a separate implementation than nsDebug's, we want to make the
// declarations compatible to avoid confusing the linker if both headers are
// included.
#ifdef __cplusplus
extern "C" {
#endif // __cplusplus
inline void printf_stderr(const char* fmt, ...) MOZ_FORMAT_PRINTF(1, 2) {
#if defined(XP_WIN)
if (IsDebuggerPresent()) {
char buf[2048];
va_list args;
va_start(args, fmt);
VsprintfLiteral(buf, fmt, args);
#endif // defined(XP_WIN)
// stderr is unbuffered by default so we open a new FILE (which is buffered)
// so that calls to printf_stderr are not as likely to get mixed together.
int fd = _fileno(stderr);
if (fd == -2) return;
FILE* fp = _fdopen(_dup(fd), "a");
if (!fp) return;
va_list args;
va_start(args, fmt);
vfprintf(fp, fmt, args);
#ifdef __cplusplus
#endif // __cplusplus
#endif // mozilla_glue_Debug_h