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77 lines
2.8 KiB
C++
77 lines
2.8 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at https://mozilla.org/MPL/2.0/. */
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#ifndef mozilla_glue_Debug_h
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#define mozilla_glue_Debug_h
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#include "mozilla/Attributes.h" // For MOZ_FORMAT_PRINTF
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#include "mozilla/Types.h" // For MFBT_API
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#include <cstdarg>
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#include <sstream>
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/* This header file intends to supply debugging utilities for use in code
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* that cannot use XPCOM debugging facilities like nsDebug.h.
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* e.g. mozglue, browser/app
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*
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* NB: printf_stderr() is in the global namespace, so include this file with
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* care; avoid including from header files.
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*/
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#ifdef __cplusplus
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extern "C" {
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#endif // __cplusplus
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/**
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* printf_stderr(...) is much like fprintf(stderr, ...), except that:
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* - on Android and Firefox OS, *instead* of printing to stderr, it
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* prints to logcat. (Newlines in the string lead to multiple lines
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* of logcat, but each function call implicitly completes a line even
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* if the string does not end with a newline.)
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* - on Windows, if a debugger is present, it calls OutputDebugString
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* in *addition* to writing to stderr
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*/
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MFBT_API void printf_stderr(const char* aFmt, ...) MOZ_FORMAT_PRINTF(1, 2);
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/**
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* Same as printf_stderr, but taking va_list instead of varargs
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*/
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MFBT_API void vprintf_stderr(const char* aFmt, va_list aArgs)
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MOZ_FORMAT_PRINTF(1, 0);
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/**
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* fprintf_stderr is like fprintf, except that if its file argument
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* is stderr, it invokes printf_stderr instead.
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*
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* This is useful for general debugging code that logs information to a
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* file, but that you would like to be useful on Android and Firefox OS.
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* If you use fprintf_stderr instead of fprintf in such debugging code,
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* then callers can pass stderr to get logging that works on Android and
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* Firefox OS (and also the other side-effects of using printf_stderr).
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*
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* Code that is structured this way needs to be careful not to split a
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* line of output across multiple calls to fprintf_stderr, since doing
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* so will cause it to appear in multiple lines in logcat output.
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* (Producing multiple lines at once is fine.)
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*/
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MFBT_API void fprintf_stderr(FILE* aFile, const char* aFmt, ...)
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MOZ_FORMAT_PRINTF(2, 3);
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/*
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* print_stderr and fprint_stderr are like printf_stderr and fprintf_stderr,
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* except they deal with Android logcat line length limitations. They do this
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* by printing individual lines out of the provided stringstream using separate
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* calls to logcat.
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*/
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MFBT_API void print_stderr(std::stringstream& aStr);
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MFBT_API void fprint_stderr(FILE* aFile, std::stringstream& aStr);
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#ifdef __cplusplus
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}
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#endif // __cplusplus
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#endif // mozilla_glue_Debug_h
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