mfbt/IntegerPrintfMacros.h
author Kyle Huey <khuey@kylehuey.com>
Sat, 15 Mar 2014 12:00:15 -0700
changeset 190962 32f48d6d3389ea5db45cfc6e452ec52595c11a43
parent 158227 a90c62555235c1525c3134ec030736be5c51de6a
child 206273 d089350aff818ac688847038226fb4ec6071dca0
permissions -rw-r--r--
Bug 967364: Rename already_AddRefed::get to take. r=bsmedberg

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 http://mozilla.org/MPL/2.0/. */

/* Implements the C99 <inttypes.h> interface, minus the SCN* format macros. */

#ifndef mozilla_IntegerPrintfMacros_h_
#define mozilla_IntegerPrintfMacros_h_

/*
 * MSVC++ doesn't include <inttypes.h>, even in versions shipping <stdint.h>, so
 * we have to reimplement it there.  Note: <inttypes.h> #includes <stdint.h>.
 *
 * Note that this header DOES NOT implement <inttypes.h>'s scanf macros.  MSVC's
 * scanf doesn't have sufficient format specifier support to implement them
 * (specifically, to implement scanning into an 8-bit location).
 *
 * http://stackoverflow.com/questions/3036396/scanfd-char-char-as-int-format-string
 *
 * Moreover, scanf is a footgun: if the input number exceeds the bounds of the
 * target type, behavior is undefined (in the compiler sense: that is, this code
 * could overwrite your hard drive with zeroes):
 *
 *   uint8_t u;
 *   sscanf("256", "%" SCNu8, &u); // BAD
 *
 * This header will sometimes provide SCN* macros, by dint of being implemented
 * using <inttypes.h>.  But for these reasons, *never* use them!
 */

#if defined(MOZ_CUSTOM_INTTYPES_H)
#  include MOZ_CUSTOM_INTTYPES_H
#elif defined(_MSC_VER)
#  include "mozilla/MSIntTypes.h"
#else
#  include <inttypes.h>
#endif

#endif  /* mozilla_IntegerPrintfMacros_h_ */